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201. 题目: Substance Flow Analysis on the Leachate DOM Molecules along Five Typical Membrane Advanced Treatment Processes
文章编号: N22111103
期刊: Water Research
作者: Tianqi Li, Fan Lü, Junjie Qiu, Hua Zhang, Pinjing He
更新时间: 2022-11-11
摘要:

The processes combining biological treatment with membrane separation technologies have been widely adopted for leachate treatment. However, dissolved organic matter (DOM) of leachate membrane concentrates generated from various membrane separation technologies has not been systematically investigated in field scale. Therefore, substance flow analysis based on DOM molecular information of leachate membrane concentrates from primary membrane systems (i.e. nanofiltration (NF) and reverse osmosis (RO)) and secondary membrane systems (i.e. disk-tube reverse osmosis (DTRO) and humic substance filtration system (HSF)) in five engineering-scale leachate treatment facilities, obtained via ultra-performance liquid chromatography coupled with hybrid quadrupole Orbitrap mass spectrometry, was given and simultaneously compared. In NF concentrates (NFC), 45.1%–98.5% of DOM originated from raw leachate (L-DOM) was concentrated, showing poor biodegradability. The L-DOM interception characteristics of NFC-fed HSF were mainly based on volume reduction but concentration effect. L-DOM in RO concentrates (ROC) showed a higher proportion of peak intensity reduced components, accounting for 50.3%–96.8%, and organic composition changes were more dependent on water quality characteristics than membrane types. ROC-fed DTRO intercepted 49.3%–72.6% of L-DOM, but DTRO may be less effective at intercepting DOM molecules in landfill leachate with higher oxidation levels. Considering risks from feasible treatment technologies, the difficulty for their treatment followed the order of DTRO concentrates > ROC > NFC. This study suggests that ROC-fed DTRO need to be controlled to avoid amplifying the treatment difficulty. Besides, treatment technologies for RO and DTRO concentrates with low-concentrated but refractory DOM and high salts should be explored.

202. 题目: Complexing agents-free bioelectrochemical trickling systems for highly-efficient mesothermal NO removal: the role of extracellular polymer substances
文章编号: N22111102
期刊: Bioresource Technology
作者: Xingzhu Huang, Shaofeng Zhou, Jianjun Li, Xiaojun Wang, Shaobin Huang, Guoping Sun, Shan Yang, Jia Xing, Meiying Xu
更新时间: 2022-11-11
摘要:

The biological treatments are promising for nitric oxide (NO) reduction, however, the biotechnology has long suffered from high demands of NO-complexing agents (i.e., Fe(II)EDTA), leading to extra operation costs. In this study, novel complexing agents-free bioelectrochemical systems have been developed for direct NO reduction. The electricity-driven bioelectrochemical trickling system (ED-BTS, a denitrifying biocathode driven by the external electricity and an acetate-consuming bioanode) achieved approximately 68% NO removal without any NO-complexing agents, superior to the bioanode-driven BTS and open-circuit BTS. The extracellular polymeric substances from the biofilms of ED-BTS contained more polysaccharides, humic substrates, and hydrophobic tryptophan that were beneficial for NO reduction. Additionally, the external electricity altered the microbial community toward more denitrifying bacteria and a higher abundance of NO reduction genes (nosZ and cnorB). This study provides a comprehensive understanding of microbial behaviors on the adsorption and reduction of NO and proposes a promising strategy for mesothermal NO biotreatment.

203. 题目: Prospects for humic acids treatment and recovery in wastewater: A review
文章编号: N22111101
期刊: Chemosphere
作者: Xuefeng Zhu, Jiadong Liu, Liang Li, Guangyin Zhen, Xueqin Lu, Jie Zhang, Hongbo Liu, Zhen Zhou, Zhichao Wu, Xuedong Zhang
更新时间: 2022-11-11
摘要:

Clean water shortages require the reuse of wastewater. The presence of organic substances such as humic acids in wastewater makes the water treatment process more difficult. Humic acids can significantly affect the removal of heavy metals and other such toxins. Humic acids is formed by the decomposition and transformation of animal and plant remains by microorganisms, and naturally exists in soil and water. It is necessary to degrade and remove humic acids from wastewater. As it seriously human health, effective technologies for removing humic acids from wastewater have attracted great interest over the past decades. This study compared existing techniques for removing humic acids from wastewater, as well as their limitations. Physicochemical treatments including filtration and oxidation are basic and key approaches to removing humic acids. Biological treatments including enzyme and fungi-mediated humic acids degradation are economically feasible but require some scalability. In conclusion, the integrated treatment processes are more significant options for the effective removal of humic acids from wastewater. In addition, humic acids have rich utilization values. It can improve the soil, increase crop yields, and promote the removal of pollutants.

204. 题目: Impact of biochar colloids on thallium(I) transport in water-saturated porous media: Effects of pH and ionic strength
文章编号: N22111020
期刊: Chemosphere
作者: Yu Cao, Chengxue Ma, Jinni Yao, Wanpeng Chen, Li Gu, Hongxia Liu, Caihong Liu, Jiaming Xiong, Xiaoliu Huangfu
更新时间: 2022-11-10
摘要:

Understanding the migration behavior of thallium (TI) in subsurface environments is essential for Tl pollution prevention. With the wide production and utilization of biochar, the notable ability of biochar colloids to carry environmental contaminants may make these colloids important for Tl(I) mobility. This study systematically investigated the impact of wood-derived biochar (WB) and corn straw-derived biochar (CB) colloids on Tl(I) transport in water-saturated porous media under different pH (5, 7 and 10) and ionic strengths (ISs) (1, 5 and 50 mM NaNO3). WB colloids improved Tl(I) transport under all IS conditions at pH 7 due to the adsorption capacity of biochar and competition for adsorption sites on the sand surface. However, at IS 50 mM, CB colloids slightly impeded Tl(I) mobility due to the straining. In addition, both WB and CB colloids accelerated Tl(I) mobility under all pH conditions at IS 5 mM. At pH 10, the promotion effect was more obvious due to the deprotonation of O-containing functional groups and higher fluidity of biochar colloids. Furthermore, the two-site nonequilibrium model and two-site kinetic attachment/detachment model suitably described the breakthrough curves (BTCs) of Tl(I) and biochar colloids, respectively. The colloid-facilitated solute transport model could also describe Tl(I) transport influenced by biochar colloids reasonably well. This study provides insight into the migration and fate of Tl(I) in the presence of biochar colloids.

205. 题目: Evaluation of digestate-derived biochar to alleviate ammonia inhibition during long-term anaerobic digestion of food waste
文章编号: N22111019
期刊: Chemosphere
作者: Yun Peng, Lei Li, Qin Dong, Pingjin Yang, Hengyi Liu, Wenjie Ye, Di Wu, Xuya Peng
更新时间: 2022-11-10
摘要:

The feasibility of using food waste anaerobic digestate-derived biochar (FWDB) to mitigate ammonia toxicity in an anaerobic digester was evaluated. The optimal conditions for preparing and adding the activated FWDB were explored using response surface experiments, and the long-term effects of adding activated FWDB on digester performance under optimum conditions were verified in semi-continuous experiments. The results showed that the optimal preparation and addition conditions for activated FWDB were pyrolysis temperature of 565 °C, particle size of 0–0.30 mm, and dosage of 15.52 g L−1. During the long-term operation of the digesters, when the total ammonia nitrogen (TAN) concentration was higher than 2000 mg L−1, the control and experimental digesters showed deteriorated reactor performance. Volatile fatty acids in the control digester accumulated to 20,306 mg L−1 after the TAN concentration increased to 3391 mg L−1, the methane yield decreased to 31 mL g VS−1, and the digester experienced process failure. In contrast, the experimental digester with added activated FWDB only suffered a slight short-term accumulation of acetate and a slight decline in methane yield. This may be attributed to the adsorption of NH4+/NH3 by activated FWDB, which reduced the TAN concentration in the anaerobic digestion (AD) system and mitigated ammonia toxicity. Microbial analysis and metagenome predictions demonstrated that the community richness, diversity, and evenness, as well as the abundance of acetogens and related key genes (ACSM1, paaF, and acdA) were higher in the experimental digester than in the control digester. This study provides a closed-loop AD enhancement strategy by pyrolysis of digestate and in-situ supplementation into the digester.

206. 题目: Ball milling enhanced Cr(VI) removal of zero-valent iron biochar composites: Functional groups response and dominant reduction species
文章编号: N22111018
期刊: Chemosphere
作者: Jinlan Zhang, Lihong Xie, Qiyan Ma, Yiyang Liu, Jie Li, Zhifeng Li, Shangyi Li, Tingting Zhang
更新时间: 2022-11-10
摘要:

Zero-valent iron biochar composites (ZVI/BC) have been widely used to remove Cr(VI) from water. However, the application of ZVI/BC prepared by the carbothermal reduction was limited by the non-uniform disperse of ZVI on the biochar surface. In this work, ball milling technique was introduced to modify ZVI/BC. Results showed that after ball milling, the maximum Langmuir adsorption capacity for Cr(VI) was 117.7 mg g−1 (298 K) which was 2.08 times higher than ZVI/BC. The initial adsorption rate of the Elovich model increased from 4.57 × 102 mg g−1 min−1 to 3.74 × 109 mg g−1 min−1 after ball milling. Dispersibility of ZVI on biochar surface and contact between ZVI and biochar were improved by the ball milling, thus accelerating the electron transfer. Besides, ball milling increased the content of oxygen-containing functional groups in biochar, contributing to the chemisorption of Cr(VI). The response sequence of oxygen-containing functional groups was analyzed by two-dimensional correlation spectroscopy, indicating that Cr(VI) preferentially complexed with phenolic –OH. Shielding experiments showed that Fe (0) was the dominant reducing species with a contribution of 73.4%, followed by surface-bound Fe(II) (21.3%) and dissolved Fe2+ (5.24%). Density functional theory calculations demonstrated that ball milled ZVI/BC improved the adsorption affinity and electron transfer flux towards Cr(VI) by introducing phenolic –OH and Fe (0). Combining all the textural characterization, the Cr(VI) removal mechanism of the ball milled ZVI/BC could be proposed as adsorption, reduction, and precipitation. Eventually, stable Cr–Fe oxides (FeOCr2O3 and Cr1·3Fe0·7O3) were formed. This work not only provides a simple method to modify ZVI/BC to remove Cr(VI) in water efficiently and rapidly, but also improves the mechanistic insight into the Cr(VI) removal by iron-carbon composites via the response sequence of functional group analysis and the quantitative analysis of reducing species.

207. 题目: Sulfur and nitrogen co-doped magnetic biochar coupled with hydroxylamine for high-efficiency of persulfate activation and mechanism study
文章编号: N22111017
期刊: Environmental Research
作者: Jinpeng Wang, Peifang Zhang, Jinxiu Peng, Qingwen Zhang, Jia Yao, Xiaoyong Wu, Yubiao Li
更新时间: 2022-11-10
摘要:

Biochar has recently become a central issue in advanced oxidation processes (AOPs) based on peroxydisulfate (PDS) activation. However, the PDS activation by biochar must be improved. In this study, S, N co-doped magnetic biochar (IBC) was prepared by a simple impregnation-pyrolysis method using Eichhornia crassipes stems with inherent sulfur and nitrogen as the raw materials for biochar. The reductant hydroxylamine (HA) was employed to further enhance PDS activation by the IBC for organic pollutant degradation. Incorporating HA in PDS activation over IBC significantly improved its compatibility with complex water, catalytic degradation, stability performance, and mineralization rate of organic pollutants. The outstanding performance of the HA/PDS/IBC system for organic degradation was due to the increased free radicals SO4·-, O2·-, and non-radical 1O2 generated, as well as the electrons transferred between IBC, PDS, and organic pollutants, which were verified by electron paramagnetic resonance (EPR) detection and electrochemical characterizations. Furthermore, HA-enhanced Fe(III)/Fe(II) cycling, surface functional groups, and S and N doping contributed to the generation of reactive oxygen species (ROS). Moreover, the toxicity assessment indicated that the toxicity of the degradation intermediates decreased. Therefore, this research proposes a new insight into the enhanced degradation of pollutants by increasing PDS activation using biochar-based catalytic materials.

208. 题目: Contrasting catchment soil pH and Fe concentrations influence DOM distribution and nutrient dynamics in freshwater systems
文章编号: N22111016
期刊: Science of the Total Environment
作者: Nana O.-A. Osafo, Jiří Jan, Petr Porcal, Jakub Borovec
更新时间: 2022-11-10
摘要:

Organic matter (OM) quantity, quality, and nutrient dynamics within twelve shallow lakes in the Czech Republic were assessed in the context of catchment soil pH and iron (Fe) concentration. The catchments of the lakes were classified into two categories: (i) slightly acidic (soil pH = 5.1–6.3) with Fe-rich soils (H_Fe; Fe = 315–344 mg kg−1 in Mehlich 3 extract); and (ii) neutral (soil pH = 6.8–7.6) with Fe-poor soils (L_Fe; Fe = 126–259 mg kg−1 in Mehlich 3 extract). The quality of OM in the two lake types was characterized using a combination of spectroscopic techniques (UV–Vis, fluorescence, and Fourier Transform Infrared spectroscopy). We show that dissolved nutrient and dissolved organic carbon (DOC) concentrations, as well as the amount of aromatic and protein-like compounds in the water column and sediment porewater were significantly (p < 0.01) lower in the H_Fe lakes compared to the waterbodies located within L_Fe catchments. The FTIR analyses of the H_Fe sediments contained higher relative concentrations of aromatic compounds with hydroxyl-containing functional groups and carbohydrates, while more aliphatic and oxidised OM was found in the L_Fe lake sediments. These results suggest that the pH value of catchment soils and, particularly, their Fe content have profound geochemical effects on the mobility of OM and nutrients in the sediments of recipient waters. Because the OM-Fe association stabilises OM in sediments, waterbodies within L_Fe catchments are likely more vulnerable to increasing eutrophication and oxygen depletion compared to those in H_Fe catchments and this has important implications for water quality management, risk assessment, and predictions of aquatic ecosystem vulnerability under conditions of accelerating climate change.

209. 题目: Effects of different composting methods on Enteromorpha: Maturity, nutrients, and organic carbon transformation
文章编号: N22111015
期刊: Journal of Cleaner Production
作者: Yun Li, Jiuzhou Li, Shanshan Li, Xiaohan Zhang, Xiaomin Xie
更新时间: 2022-11-10
摘要:

This study investigated the composting performance of Enteromorpha for product maturity and organic carbon transformation under membrane-covered aerobic composting and windrow composting. Meanwhile, the effects of adding mushroom waste as an additive on the Enteromorpha composting process performance were evaluated. Results show that Enteromorpha was highly compostable and had low phytotoxicity under different composting techniques after 60 days. Each method's high temperature (>50 °C) can maintain for more than 5 days during the composting process of Enteromorpha, which meets the Chinese national standard for organic fertilizer production. Moreover, the highest GI (113%) was obtained by the forced ventilation treatment with mushroom waste, which was mainly achieved by adjusting the raw materials of compost. The addition of mushroom waste could improve the polymerization of humic substances and maintain nutrients, while the Enteromorpha alone composting had a serious nutrient loss phenomenon no matter what method was adopted. Regardless of composting conditions, the rapid decline of cellulose, fat, and starch content occurred during the high-temperature period. In addition, the maturity of Enteromorpha compost was mainly related to the degradation of organic matter. Forced ventilation can reduce the phytotoxicity of Enteromorpha composting better than windrow composting. The results can provide theoretical basis and measures for the practical application of Enteromorpha treatment and the directional control of compost maturity.

210. 题目: Physicochemical Properties of Nanosized Biochar Regulated by Heat Treatment Temperature Dictates Algal Responses: From the Perspective of Fatty Acid Metabolism
文章编号: N22111014
期刊: Journal of Hazardous Materials
作者: Yichao Huang, Jia Lv, Saibo Liu, Shishu Zhu, Wencong Yao, Jiachen Sun, Hua Wang, Da Chen, Xiaochen Huang
更新时间: 2022-11-10
摘要:

Nanosized biochar (NBC) is an important fraction of biochar (BC) as it can exert nano-scale effects on aquatic organisms, attracting increasing research attention. However, effects of different physicochemical properties of NBC on biological responses at the metabolic and gene expression level are not comprehensively understood. Here, biological effects of NBCs pyrolyzed at different heat treatment temperatures (HTTs, 350-700 °C) were evaluated using freshwater algae Chlorella vulgaris, from the perspectives of growth and fatty acid (FA) profile changes. NBC pyrolyzed at 700 °C (N700) induced the greatest algal growth inhibition and oxidative stress than N350 and N500. In addition, NBC exposure to 50 mg/L increased saturated and monounsaturated FAs, along with a decrease in polyunsaturated FAs (PUFAs). Exposure to NBC also significantly influenced the expression of key FA metabolism genes (3fad, sad, kasi and accd), demonstrating the potential role of reactive oxygen species-mediated PUFA reduction accompanied by increased membrane permeability in algal toxicity upon NBC exposure. The observed differences in response to N700 were attributed to its smaller particle size and higher abundance of –COOH. These findings reveal the underlying mechanisms in the algal response to NBCs and provide valuable guidance for the safe design and application of BC materials.

211. 题目: Fungal necromass increases soil aggregation and organic matter chemical stability under improved cropland management and natural restoration
文章编号: N22111013
期刊: Science of the Total Environment
作者: Lu Liu, Anna Gunina, Fusuo Zhang, Zhenling Cui, Jing Tian
更新时间: 2022-11-10
摘要:

The formation and stability of soil organic matter (SOM) is crucial for food security, soil health, and climate change mitigation. Although various SOM stabilization mechanisms have been proposed and investigated, the contribution of plant- and microbial-derived carbon into physical and chemical stabilization processes remain unclear. Therefore, this study investigates lignin phenols, microbial necromass, soil aggregation and SOM chemical composition under three cropland management and two natural restoration strategies: NPK, NPK + manure (NPK + M) and NPK + peat vermiculite (NPK + PV) after 5 years, and natural restoration for 10 and 40 years (NR10 and NR40, respectively). Addition of manure or peat vermiculite and NR40 increased soil organic carbon (SOC) by 86–122 % and 16 %, respectively, compared to the NPK fertilization. Lignin phenols and bacterial necromass-C were the highest under NPK + M, and lignin phenols increased by 0.07 g and microbial necromass-C by 0.44 g with each additional 1 g of SOC. Fungal necromass-C in NPK + PV was 0.14–1.1 times higher than in other treatments. The mean weight diameter of aggregates was the highest, while macroaggregate turnover was the slowest under NPK + PV, indicating increased soil aggregation and physical stability. Natural restoration reduced lignin phenols by 33–40 % and labile O-alkyl C by 4–9 %, but increased resistant alkyl C by 9–15 % compared with other treatments, reflecting the highest chemical stability. High fungal necromass was beneficial to the accumulation of particulate and mineral-associated C and aggregate stability, and decelerated macroaggregate turnover. Aromatic C increased but aliphatic-C/aromatic-C decreased with increasing fungal necromass-C. Consequently, fungal necromass C increases SOM physical stability by slowing aggregate turnover and enhances the chemical stability through the accumulation of recalcitrant C under improved cropland management and natural restoration.

212. 题目: Spectral change of dissolved organic matter after extracted by solid-phase extraction and its feasibility in predicting the acute toxicity of polar organic pollutants in textile wastewater
文章编号: N22111012
期刊: Journal of Hazardous Materials
作者: Lingfang Fu, Liying Bin, Zhaobo Luo, Zehong Huang, Ping Li, Shaosong Huang, Dieudonne Nyobe, Fenglian Fu, Bing Tang
更新时间: 2022-11-10
摘要:

Spectroscopic parameters can be used as proxies to effectively trace the occurrence of organic trace contaminants, but their suitability for predicting the toxicity of discharged industrial wastewater with similar spectra is still unknown. In this study, the organic contaminants in treated textile wastewater were subdivided and extracted by four commonly-used solid-phase extraction (SPE) cartridges, and the resulting spectral change and toxicity of textile effluent were analyzed and compared. After SPE, the spectra of the percolates from the four cartridges showed obvious differences with respect to the substances causing the spectral changes and being more readily adsorbed by the WAX cartridges. Non-target screening results showed source differences in organic micropollutants, which were one of the main contributors leading to their spectral properties and spectral variations after SPE in the effluents. Two fluorescence parameters (C1 and humic-like) identified by the excitation emission matrix-parallel factor analysis (EEM-PARAFAC) were closely correlated to the toxicity endpoints for Scenedesmus obliquus (inhibition ratios of cell growth and Chlorophyll-a synthesis), which can be applied to quantitatively predict the change of toxicity effect caused by polar organic pollutants. The results would provide novel insights into the spectral feature analysis and toxicity prediction of the residual DOM in industrial wastewater.

213. 题目: Molecular weight-dependent adsorption heterogeneities of humic acid on microplastics in aquatic environments: Further insights from fluorescence spectra combined with two-dimensional correlation spectroscopy and site energy distribution analysis
文章编号: N22111011
期刊: Journal of Environmental Chemical Engineering
作者: Rui Gao, Kunyan Cui, Weiqian Liang, Hao Wang, Shuyin Wei, Yingyue Zhou, Feng Zeng
更新时间: 2022-11-10
摘要:

Microplastics as emerging environmental contaminants have attracted global attention. Ubiquitous dissolved organic matter (DOM), a heterogeneous mixture with various organic components and continuous molecular weight (MW) distribution, can significantly influence the fate, bioavailability and toxicity of microplastics in aquatic environments. However, to date, understanding of the MW-dependent adsorption heterogeneities of DOM on microplastics in aquatic environments has remained unknown. In this study, the soil humic acid (HA), a representative DOM, was fractionated into >100 kDa HA, 30-100 kDa HA, 10-30 kDa HA, 3-10 kDa HA and <3 kDa HA, whose adsorption behaviors on polystyrene microplastics (PSMPs) under different electrolytes at pH6.0 investigated by multispectral techniques, as well as two-dimensional correlation spectroscopy and site energy distribution analysis. High molecular weight MW-fractionated HAs dominated the soil HA. Compared to the lower molecular weight MW-fractionated HAs, the higher molecular weight counterparts exhibited higher aromaticity, showing higher adsorption affinities onto PSMPs in aquatic environments. Adsorption isotherms and kinetics of the MW-fractionated HAs onto PSMPS can be reasonably explained by Langmuir models and the linear driving force (LDF) model, respectively. Enhanced aromaticity in residual solutions was observed, suggesting that the preferable adsorption of the higher aromatic moieties in the pristine and MW-fractionated HAs on PSMPs could be subsequently replaced by the lower aromatic moieties for the limited binding sites. Combined, the humic-like materials in MW-fractionated HAs could be significantly impacted the complexation of PSMPs in aquatic environments. The heterogeneous/complicated distributions of active adsorption sites in the humic-like materials of the MW-fractionated HAs, and the subsequent subtle changes of these sites to PSMPs were characterized by synchronous fluorescence spectroscopy coupled with two-dimensional correlation spectroscopy. High molecular weight MW-fractionated HAs provided more active adsorption sites than those in the low molecular weight counterparts, which also possessed stronger adsorption affinities and higher complexation capacities to PSMPs. The site energy distributions for the adsorption of the MW-fractionated HAs on PSMPs were calculated based on Langmuir model. The adsorption heterogeneities of PSMPs at the experimental conditions were close. This study provides deep insights into the MW-dependent adsorption heterogeneities of HA on PSMPs, and the results are of significance to understand the biogeochemical behaviors of DOM and MPs in aquatic environments.

214. 题目: Varied promotion effects and mechanisms of biochar on anaerobic digestion (AD) under distinct food-to-microorganism (F/M) ratios and biochar dosages
文章编号: N22111010
期刊: Waste Management
作者: Yuqi Chen, Yuzheng Wang, Hongyu Xie, Wenzhi Cao, Yanlong Zhang
更新时间: 2022-11-10
摘要:

Biochar (BC) promotes the performance of anaerobic digestion (AD) through different routes, such as enriching microbes, buffering pH and promoting electron transfer. However, the mechanisms and processes of AD that enhanced by BC under various food to microorganism (F/M) ratios are still unclear. The organic transformations, bioelectrochemical characteristics and microbial consortia under the different BC dosages and F/M ratios were studied to reveal the role of BC in an AD process. The electron transfer system (ETS) was proportional to BC dosage and considered to be a key for AD promotion. At the F/M ratios of 0.5 and 1.0, BC accelerated methane production mainly by promoting ETS. The most enhanced specific methanation activities (SMAs) were obtained with 10.0 g/L BC, and the promotion efficiency under the F/M ratio of 1.0 was significantly higher (P < 0.05) than that under the F/M ratio of 0.5. Under the higher F/M ratio of 2.0, BC shortened the entire AD duration for 5.0 ∼ 13.0 days and guaranteed the resilience of AD by expanding the thermodynamic window of syntrophic methanogenesis via direct interspecies electron transfer (DIET). The COD balance analysis and the ecological functional profiles of microbes demonstrated that BC promoted both the anabolism and catabolism of anaerobes, and enhanced the DIET by converting hydrotrophic methanogenesis into acetolastic methanogenesis pathway. Besides, excessive BC enhanced SMA and simultaneously triggered superfluous biomass growth and thus decreased CH4 yield. This study provided an important reference for further application of BC under various F/M ratios and dosages in AD.

215. 题目: Microbially driven fate of terrigenous particulate organic matter in oceans
文章编号: N22111009
期刊: Limnology and Oceanography
作者: Lianbao Zhang, Mingming Chen, Yue Zheng, Jianning Wang, Xilin Xiao, Xiaowei Chen, Chen Hu, Jiaming Shen, Jihua Liu, Kai Tang, Dapeng Xu, Qiang Shi, Xiaoyan Ning, Helmuth Thomas, Wei Qin, Meixun Zhao, Nianzhi Jiao, Yao Zhang
更新时间: 2022-11-10
摘要: A long-standing enigma in oceanography is why terrestrial organic matter is “missing” in the global ocean, despite the considerable discharge into it every year. Although some explanations, such as mineralogical composition, hydrodynamic processes, and priming effect, have been proposed, we hypothesize that the essential mechanism behind the missing organic matter is microbial processing, for which the underlying coupled geochemical, molecular, and genetic evidence is unknown. An ultra-large-volume, long-term river–seawater stratified simulation system was constructed to unravel the microbially driven fate of terrigenous particulate organic matter (POM) in oceans. Analysis of combining the molecular with POM chemical composition data suggests that Bacteroidetes could act as pioneers in the processing of terrigenous POM in oceans, degrading high-molecular-weight, high-carbon compounds such as polysaccharides. Remaining low-molecular-weight nitrogenous organic matter is subsequently degraded by Planctomycetes and Proteobacteria. Isotopic signals show that this preferential degradation causes a distinct “aging” effect of POM, and along with nitrification enhanced by remineralization, causes a decrease in the POM C : N ratio. Degradation of terrigenous POM and bacterial biomass biosynthesis leads to positive deviations in δ15N and δ13C. Relatively refractory hydrocarbons, aromatic compounds, and phenols are accumulated by microbial processes in this system. This study provides mechanistic insights into the missing chemical and isotopic signals and microbially driven fate of terrigenous POM in the ocean, with important implications for how riverine material input affects marine carbon and nitrogen cycling.

216. 题目: Mechanistic study of electrooxidation of coexisting chloramphenicol and natural organic matter: Performance, DFT calculation and removal route
文章编号: N22111008
期刊: Separation and Purification Technology
作者: Ruifeng Wang, Hongyou Wan, Beibei Wang, Kehao Zhang, Huanhuan Shi, Wei Zhang, Jianwei Tang, Hailong Wang, Shixiang Gao, Qingguo Huang
更新时间: 2022-11-10
摘要:

The electrooxidation performance of coexisting chloramphenicol (CAP) and natural organic matter (NOM) by Ti4O7 anode was systematically investigated in this study. Intrinsic reaction kinetics showed that the removal of CAP followed pseudo-first-order kinetics, 72.42 ± 0.20% removal with 40.79 ± 0.41% mineralization rate of CAP was achieved in 60 min using 5 mA cm-2. The oxidation mechanisms of CAP were elucidated by density functional theory (DFT) simulations and experiments involving hydroxyl free radical (OH) scavenger, which indicated that the efficient degradation of CAP was attributed to the combined action of OH attack and direct electron transfer (DET) reaction. The degradation pathway of CAP was proposed based on frontier electron densities (FEDs) calculation and intermediate products identification, and less ecological risks of CAP degradation solution were also proved by acute toxicity test. Humic acid (HA), selected as the typical NOM, could inhibit the degradation of CAP to a certain extent by competitive action for electrooxidation with effective removal and mineralization of HA, which was further confirmed based on real wastewater treatment experiments. Specifically, the degree of humification and aromaticity of HA was weakened, and some complex small molecular organic matters such as aromatic proteins were generated. These findings proved the feasibility of Ti4O7 anode electrooxidation to remove CAP antibiotics and organic matter from water, in consideration of the potential negative role of CAP and organic matter for ecological environment and human health.

217. 题目: Water Solubility Distribution of Organic Matter Accounts for the Discrepancy in Hygroscopicity among Sub- and Supersaturated Humidity Regimes
文章编号: N22111007
期刊: Environmental Science & Technology
作者: Wen-Chien Lee, Yange Deng, Ruichen Zhou, Masayuki Itoh, Michihiro Mochida, Mikinori Kuwata
更新时间: 2022-11-10
摘要: Water uptake properties of organic matter (OM) are critical for aerosol direct and indirect effects. OM contains various chemical species that have a wide range of water solubility. However, the role of water solubility on water uptake by OM has poorly been investigated. We experimentally retrieved water solubility distributions of water-soluble OM (WSOM) from combustion of mosquito coil and tropical peat using the 1-octanol–water partitioning method. In addition, hygroscopic growth and cloud condensation nuclei (CCN) activity of solubility-segregated WSOM were measured. The dominant fraction of WSOM from mosquito coil smoldering was highly soluble (water solubility (S) > 10–2 g cm–3), while that from peat combustion contained ∼40% of less-soluble species (S < 10–3 g cm–3). The difference in water solubility distributions induced changes in the roles of less water-soluble fractions (S < 10–3 g cm–3) on CCN activity. Namely, the less water-soluble fraction from mosquito coil combustion fully dissolved at the point of critical supersaturation, while that for tropical peat smoldering was limited by water solubility. The present result suggests that water solubility distributions of OM, rather than its bulk chemical property, need to be quantified for understanding the water uptake process.

218. 题目: A comparative assessment of humic acid and biochar altering cadmium and arsenic fractions in a paddy soil
文章编号: N22111006
期刊: Journal of Soils and Sediments
作者: Fande Meng, Qiuxiang Huang, Yongbing Cai, Liang Xiao, Teng Wang, Xiaoliang Li, Wenge Wu, Guodong Yuan
更新时间: 2022-11-10
摘要:

Purpose

Contamination of agricultural soils by multiple heavy metal(loid)s poses a threat to environmental quality and food safety. Humic acid (HA) and biochar (BC) are common amendments for soil remediation. This study systematically investigated the effects of HA and BC on the redistribution of Cd and As fractions in contaminated soil and assessed the side effects of HA and BC in soil remediation.

Materials and methods

The experiments were designed to probe the dynamic behavior of soil pH, bioavailable Cd and As, and the five fractions of Cd and As in the presence of HA or BC during the 180-day incubation. A leonardite-derived HA (L-HA) and bamboo willow-derived BC (BWB) were added as amendments at 1% and 3% doses to a paddy soil (pH 5.88) contaminated by multiple heavy metal(loid)s. The treatments were denoted as L-HA1, L-HA3, BWB1, and BWB3, respectively, with cadmium (soil Cd, 4.47 mg/kg) and arsenic (soil As, 97.05 mg/kg) as the target contaminants.

Results

The soil pH reduced to 5.69 at L-HA1 and 5.33 at L-HA3 but increased to 6.27 at BWB1 and 6.75 at BWB3. L-HA1 and L-HA3 lowered bioavailable Cd by 10.79% and 11.27% and bioavailable As by 21.16% and 23.58%, respectively. While, BWB1 and BWB3 increased bioavailable Cd and increased by 18.13% and 18.94% bioavailable Cd and no apparent effect on bioavailable As in comparison with control. In terms of the fractions of heavy metal(loid)s during the 180-day incubation, L-HA and BWB dynamically altered Cd and As redistributions. L-HA1 and L-HA3 reduced exchangeable Cd by 17.60% and 48.75%, respectively, but increased residual Cd by 40.17% and 46.93% and residual As by 18.97% and 20.14%, respectively. BWB1 and BWB3 decreased exchangeable Cd by 11.65% and 37.16% but increased residual Cd by 33.84% and 37.02%, respectively. In contrast, BWB1 and BWB3 increased exchangeable As by 4.07% and 46.89% but lowered residual As by 5.31% and 27.06%, respectively.

Conclusion

The L-HA and BWB can alter soil properties and heavy metal(loid)s fractions, and L-HA is better in reducing the potential risk of Cd and As in contaminated soil. A higher dose of HA (L-HA3) is better in immobilizing Cd and As than L-HA1, and the BWB showed a similar effect on Cd but an opposite effect on As. Therefore, HA and BC are applicable amendments for the remediation of metal(loid)-contaminated soil. Still, their side effects should be assessed based on specific soil and amendment properties.

219. 题目: Manganese-modified biochar promotes Cd accumulation in Sedum alfredii in an intercropping system
文章编号: N22111005
期刊: Environmental Pollution
作者: Xuejiao Chen, Qimei Lin, Hongyang Xiao, Rizwan Muhammad
更新时间: 2022-11-10
摘要:

Intercropping of crops with hyperaccumulators is a sustainable method to remediate contaminated soil without impeding agro-production. However, the function of engineered biochar in intercropping systems and its possible influence on cadmium (Cd) accumulation in hyperaccumulators remain unknown. A root box experiment on celery and Sedum alfredii with and without root separation was conducted in this study. Pristine and KMnO4-modified biochar (BCMn) were used to investigate the effects of different biochars on plant growth and Cd uptake in an intercropping system, as well as the influence of engineered biochar on Cd accumulation in hyperaccumulators. The results demonstrated that soil pH did not significantly vary with biochar application in the root separation treatment. However, BCMn significantly increased soil pH and thus reduced available Cd when the plant roots were not separated. Intercropping (no separation treatment) led to a 34% higher and 24% lower aboveground biomass of celery and S. alfredii, respectively, regardless of biochar addition. Compared with aboveground plant parts, plant roots exhibited more significant responses to biochar. Interestingly, intercropping may favour the phytoextraction of Cd by S. alfredii. In particular, the Cd uptake by S. alfredii roots substantially increased (118–187%), whereas that of celery roots decreased (51–71%) with BCMn addition, compared with other treatments. Moreover, after BCMn addition the accumulation of Cd in aboveground S. alfredii in the no separation treatment was 136% higher than that in the separation treatment. This was possibly related to the interaction of manganese (Mn) with Cd as well as the roots of S. alfredii. These findings provide new insights into the application of engineered biochar for phytoextraction, which is important for the efficient remediation of Cd-contaminated soils.

220. 题目: Climate-related soil saturation and peatland development may have conditioned surface water brownification at a central European lake for millennia
文章编号: N22111004
期刊: Science of the Total Environment
作者: Anna Tichá, Daniel Vondrák, Alice Moravcová, Richard Chiverrell, Petr Kuneš
更新时间: 2022-11-10
摘要:

Water brownification has long altered freshwater ecosystems across the northern hemisphere. The intensive surface water brownification of the last 30 years was however preceded by previous long-lasting more humic browning episodes in many catchments. To disentangle a cascade of browning-induced environmental stressors this longer temporal perspective is essential and can be reconstructed using paleolimnological investigations. Here we present a Holocene duration multi-proxy paleolimnological record from a small forest mountain lake in the Bohemian Forest (Czechia) and show that climate-related soil saturation and peatland development has driven surface water brownification for millennia there. A long core retrieved from the central part of the lake was dated using 14C and 210Pb, subsampled and analyzed for diatoms and zoological indicator (chironomids, planktonic cladocerans) remains. X-ray fluorescence (XRF) provided a record of elements sensitive to biogeochemical processes connected to browning and catchment development (P, Ti, Al/Rb, Fe/Ti, Mn/Ti, Si/Ti). Three threshold shifts related to the processes of water browning were detected in both diatom and chironomid successions at ~10.7, ~5.5 and ~4.2 cal. ky BP. Since, postglacial afforestation of the catchment ~10.7 cal. ky BP the lake experienced strong thermal stratification of the waters, but after ~6.8 cal. ky BP soil saturation and expansion of peatlands led to effective shading and probable nutrient limitation within the lake ecosystem. The more intensive in-wash of dissolved organic matter appears to decline after ~4.2 cal. ky BP, when the paludified catchment soils became permanently anoxic. Two temporary negative and positive anomalies of browning progress occur at the same time and may be connected with the “8.2 ka event” and the “4.2 ka event”, respectively. The key role of peatlands presence in the catchment was manifested in millennial-scaled browning process and a climatic forcing of long-lasting browning is evidenced by coincidence with the moistening of climate across the northern hemisphere after ~6 cal. ky BP.

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