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221. 题目: Coupled effects of human activities and river–Lake interactions evolution alter sources and fate of sedimentary organic carbon in a typical river–Lake system
文章编号: N24033013
期刊: Water Research
作者: Shilan Wang, Fengwei Ran, Zhongwu Li, Changrong Yang, Tao Xiao, Yaojun Liu, Xiaodong Nie
更新时间: 2024-03-30
摘要: Interconnected river–lake systems record sedimentary organic carbon (OC) dynamics and watershed environmental changes, providing valuable information for global carbon budgets and watershed management. However, owing to the evolving river–lake interactions under global change, monitoring OC is difficult, thereby impeding the understanding of OC transport and fate. This study provided new insights into the dynamical mechanisms of OC in a typical river–lake system consisting of Dongting Lake and its seven inlet/outlet rivers (the three inlets of the Yangtze River and four tributaries) over the last century using stable isotope tracing and quantified the influences of climate change and human activities on OC. Results indicated that exogenous OC dominated the OC in the lake (58.2 %–89.0 %) and was lower in the west than in the east due to the differences in the material inputs and depositional conditions within the lake. Temporally, the distribution patterns of OC sources mainly responded to human activities in the basin rather than to climate change. Before 2005, the Yangtze River contributed the most OC (53.5 %–74.6 %), attributed to the high-intensity land use changes (path coefficient (r): 0.48, p-value < 0.01) and agriculture-industry activities (r: 0.44, p-value < 0.001) in the Yangtze River basin that increased soil erosion. After 2005, a large amount of Yangtze River OC was intercepted by the Three Gorges Dam, altering the OC exchange in the river–lake system and shifting OC dominance to the four tributaries (52.2 %–63.8 %). These findings highlight the active response of OC to the river–lake interaction evolution and anthropogenic control, providing critical information for regulating watershed management behavior under global change.

222. 题目: Novel cow dung-doped sludge biochar as an efficient ozone catalyst: Synergy between graphitic structure and defects induces free radical pathways
文章编号: N24033012
期刊: Environmental Research
作者: Yuxuan Yang, Kedong Ma, Yubo Cui, Ke Zhao, Yuning Lu, Wanjun Zhang, Peijing Kuang, Xuejun Zou
更新时间: 2024-03-30
摘要: A composite material, cow dung-doped sludge biochar (Zn@SBC-CD), was synthesized by one-step pyrolysis using ZnCl as an activating agent and applied to a catalytic ozonation process (COP) for methylene blue (MB) removal. SEM, XRD, FTIR, XPS and BET analyses were performed to characterize the biochar (BC) catalysts. Zn@SBC-CD had high graphitization degree, abundant active sites and uniform distribution of Zn on its surface. Complete removal of MB was achieved within 10 min, with a removal rate much higher than that of ozone alone (32.4%), implying the excellent ozone activation performance of Zn@SBC-CD. The influence of experimental parameters on MB removal efficiency was examined. Under the optimum conditions in terms of ozone dose 0.04 mg/mL, catalyst dose 400 mg/L and pH 6.0, COD was completely removed after 20 min. Electron paramagnetic resonance (EPR) analysis revealed radical and non-radical pathways were involved in MB degradation. The Zn@SBC-CD/O system generated superoxide anion radicals (O), which were the main active species for MB removal, through adsorption, transformation, and transfer, Furthermore, Zn@SBC-CD exhibited good reusability and stability in cycling experiments. This study provides a novel approach for the utilization of cow dung and sludge in synthesis of functional biocatalysts and application in organic wastewater treatment.

223. 题目: Noise Filtering Algorithm Using Gaussian Mixture Models for High-Resolution Mass Spectra of Natural Organic Matter
文章编号: N24033011
期刊: Analytical Chemistry
作者: Alexander A Potemkin, Mikhail A Proskurnin, Dmitry S Volkov
更新时间: 2024-03-30
摘要: High-resolution mass spectra of natural organic matter (NOM) contain a large number of noise signals. These signals interfere with the correct molecular composition estimation during nontargeted analysis because formula-assignment programs find empirical formulas for such peaks as well. Previously proposed noise filtering methods that utilize the profile of the intensity distribution of mass spectrum peaks rely on a histogram to calculate the intensity threshold value. However, the histogram profile can vary depending on the user settings. In addition, these algorithms are not automated, so they are handled manually. To overcome the mentioned drawbacks, we propose a new algorithm for noise filtering in mass spectra. This filter is based on Gaussian Mixture Models (GMMs), a machine learning method to find the intensity threshold value. The algorithm is completely data-driven and eliminates the need to work with a histogram. It has no customizable parameters and automatically determines the noise level for each individual mass spectrum. The algorithm performance was tested on mass spectra of natural organic matter obtained by averaging a different number of microscans (transients), and the results were compared with other noise filters proposed in the literature. Finally, the effect of this noise filtering approach on the fraction of peaks with assigned formulas was investigated. It was shown that there is always an increase in the identification rate, but the magnitude of the effect changes with the number of microscans averaged. The increase can be as high as 15%.

224. 题目: Advanced sustainable processes via functionalized Fe–N co-doped fishbone biochar for the remediation of plasticizer di-(2-ethylhexyl) phthalate-contaminated marine sediment
文章编号: N24033010
期刊: Environmental Pollution
作者: Cheng-Di Dong, Chin-Pao Huang, Chiu-Wen Chen, Chang-Mao Hung
更新时间: 2024-03-30
摘要: Sediments are important sinks for di-(2-ethylhexyl) phthalate (DEHP), a plasticizer, and thus, maintaining the sediment quality is essential for eliminating plasticizers in aqueous environments and recovering the sediment ecological functions. To mitigate the potential risks of endocrine-disrupting compounds, identifying an effective and eco-friendly degradation process of organic pollutants from sediments is important. However, sustainable and efficient utilization of slow pyrolysis for converting shark fishbone to generate shark fishbone biochar (SFBC) has rarely been explored. Herein, SFBC biomass was firstly produced by externally incorporating heteroatoms or iron oxide onto its surface in conjunction with peroxymonosulfate (PMS) to promote DEHP degradation and explore the associated benthic bacterial community composition from the sediment in the water column using the Fe-N-SFBC/PMS system. SFBC was pyrolyzed at 300–900 °C in aqueous sediment using a carbon-advanced oxidation process (CAOP) system based on PMS. SFBC was rationally modified via N or Fe–N doping as a radical precursor in the presence of PMS (1 × 10 M) for DEHP removal. The innovative SFBC/PMS, N-SFBC/PMS, and Fe-N-SFBC/PMS systems could remove 82%, 65%, and 90% of the DEHP at pH 3 in 60 min, respectively. The functionalized FeO and heteroatom (N) co-doped SFBC composite catalysts within a hydroxyapatite-based structure demonstrated the efficient action of PMS compared to pristine SFBC, which was attributed to its synergistic behavior, generating reactive radicals (SO, HO•, and O) and non-radicals (O) involved in DEHP decontamination. DEHP was significantly removed using the combined Fe-N-SFBC/PMS system, revealing that indigenous benthic microorganisms enhance their performance in DEHP-containing sediments. Further, DEHP-induced perturbation was particularly related to the phylum, whereas genus and species were observed. This study presents a sustainable method for practical, green marine sediment remediation via PMS-CAOP-induced processes using a novel Fe-N-SFBC composite material and biodegradation synergy.

225. 题目: Recovery and regeneration of water-hardened magnetic composite biochar sphere for the removal of multiple heavy metals in contaminated soils
文章编号: N24033009
期刊: Journal of Cleaner Production
作者: Yi Wu, Zongwei Wang, Yuhang Yan, Yuqian Zhou, Bushra Huma, Zhongxin Tan, Tuo Zhou
更新时间: 2024-03-30
摘要: Biochar has exceeded expectations for immobilizing heavy metals (HMs), but the potential ecological risks of its long-term burial in soil limit its practical application on a large scale. To address this challenge, a novel separable water-hardened magnetic composite biochar sphere (WMBCS) was prepared and applied to remediate agricultural soils contaminated with Cd, Pb, and As. The first application of WMBCS is simultaneously effective in removing Cd (3.2–12.7%), Pb (3.3–13.1%), and As (5.0–25.6%) from soil, and the removal rates are enhanced with increasing soil moisture, application dose and incubation time. WMBCS is more efficient for removing Cd and Pb in mildly contaminated alkaline soils than in heavily contaminated acidic soils. Compared with other regeneration methods, shaking and ultrasound-assisted EDTA-2Na efficiently elutes HMs with a dissolution efficiency of over 75% within 4 h, accompanied by the lowest rate of mass loss (7.6%) and Fe leaching (475.1 mg kg). After 5 rounds of successive cyclic remediation, WMBCS exhibits high adsorption efficiency (26.5–30.6% for Cd, 25.4–30.2% for Pb, and 30.2–41.0% for As), magnetic separation efficiency (98.8–99.8%) and regeneration efficiency (92.3–95.4%). The main mechanisms involved in the adsorption and regeneration of WMBCS include ion exchange and chelation. WMBCS is an economical and eco-friendly material with vast unexplored potential for use in agriculture.

226. 题目: Organic fermentative-humic soil subhorizon (Ofh) as a ‘natural sponge’ of selected trace elements: Does this feature make it a potential geoindicator of temperate soil quality?
文章编号: N24033008
期刊: Land Degradation & Development
作者: Sabina Dołęgowska, Agnieszka Sołtys, Karina Krzciuk
更新时间: 2024-03-30
摘要: In a temperate climate zone, the outermost part of forest soil forms the organic-O horizon. It consists of subhorizons of varying thickness, including the organic fermentative-humic subhorizon (Ofh), which resembles a tobacco tangled mat. The scientific novelty of this project is to evaluate whether the specific structure of the subhorizon-Ofh makes it a ‘natural sponge’ for trace elements such as Cd, Hg, Pb and Zn, and whether it can be used as a potential geoindicator of soil quality. To test this hypothesis, 110 soil samples (55 from the subhorizon-Ofh and 55 from the underlying soil horizons-A [humic] or AE [humic-eluvial]) were collected from five forest areas located in the south-central Poland (Świętokrzyskie province). All samples were analysed for Ba, Ca, Cd, Cu, Fe, Hg, K, Mn, Pb, S, Ti and Zn. pH, EC, soil organic matter, total C and N were also measured. Our results confirm that the subhorizon-Ofh acts like the sponge in relation to Cd, Hg and Zn. Concentrations of these elements are two to four times higher than in the A and AE horizons. Such a relationship is not observed for Pb which predominates in the A horizon. This feature means that analyses of samples from different (sub)horizons can lead to misleading conclusions about soil quality and contamination levels, which have been verified by geochemical factors. Our results can be a starting point for further research into the possible use of the subhorizon-Ofh as a geoindicator of temperate soil quality in relation to selected trace elements.

227. 题目: Treeline displacement may affect lake dissolved organic matter processing at high latitudes and altitudes
文章编号: N24033007
期刊: Nature Communications
作者: Núria Catalán, Carina Rofner, Charles Verpoorter, María Teresa Pérez, Thorsten Dittmar, Lars Tranvik, Ruben Sommaruga, Hannes Peter
更新时间: 2024-03-30
摘要:

Climate change induced shifts in treeline position, both towards higher altitudes and latitudes induce changes in soil organic matter. Eventually, soil organic matter is transported to alpine and subarctic lakes with yet unknown consequences for dissolved organic matter (DOM) diversity and processing. Here, we experimentally investigate the consequences of treeline shifts by amending subarctic and temperate alpine lake water with soil-derived DOM from above and below the treeline. We use ultra-high resolution mass spectrometry (FT-ICR MS) to track molecular DOM diversity (i.e., chemodiversity), estimate DOM decay and measure bacterial growth efficiency. In both lakes, soil-derived DOM from below the treeline increases lake DOM chemodiversity mainly through the enrichment with polyphenolic and highly unsaturated compounds. These compositional changes are associated with reductions in bulk and compound-level DOM reactivity and reduced bacterial growth efficiency. Our results suggest that treeline advancement has the potential to enrich a large number of lake ecosystems with less biodegradable DOM, affecting bacterial community function and potentially altering the biogeochemical cycling of carbon in lakes at high latitudes and altitudes.

228. 题目: Porous durian shell biochar modified by KMnO4 (Mn-DSB) as a highly selective adsorbent for Be(II)
文章编号: N24033006
期刊: Environmental Science and Pollution Research
作者: Yucheng Su, Xu Zhao, Yige Sun, Yuexiang Dong, Weiliang Wang, Haoshuai Li, Fang Hu, Qingliang Wang
更新时间: 2024-03-30
摘要:

The mining of uranium-beryllium ores has resulted in substantial beryllium (Be) contamination. In this study, agricultural waste durian shells were utilized as raw materials to prepare biochar, which was further modified to enhance its adsorption capacity (Mn-DSB). The results effectively demonstrated Mn loading onto the DSB surface. Batch experiments were conducted to identify the optimal adsorption conditions of Mn-DSB for beryllium. At a temperature of 35 °C and pH 6, beryllium’s maximum adsorption capacity (Qe) was 42.08 mg·g−1. The materials’ internal structure was analyzed before and after adsorption via multiple techniques. Mn-DSB manifested potent selectivity towards beryllium in multicomponent mixed solutions, binary systems, and uranium-beryllium wastewater, as the beryllium removal rate exceeded 90%. The study investigated the recyclability of Mn-DSB and found that after five reuse cycles, the adsorption and desorption efficiencies were 90% and 85%, respectively. The strong ligand complexation (N–H, CO32−, -OH) and ion exchange mechanisms (with Mn7+ ions) of Mn-DSB explained its high adsorption capacity. Therefore, this study demonstrates the potential of Mn-DSB for treating uranium-beryllium tailing wastewater.

229. 题目: Soil organic carbon mapping utilizing convolutional neural networks and Earth observation data, a case study in Bavaria state Germany
文章编号: N24033005
期刊: Geoderma
作者: Nikolaos Tziolas, Nikolaos Tsakiridis, Uta Heiden, Bas van Wesemael
更新时间: 2024-03-30
摘要: The Copernicus Sentinel-2 multispectral imagery data may be aggregated to extract large-scale, bare soil, reflectance composites, which enable soil mapping applications. In this paper, this approach was tested in the German federal state of Bavaria, to provide estimations for soil organic carbon (SOC). Different temporal ranges were considered for the generation of the composites, including multi-annual and seasonal ranges. A novel multi-channel convolutional neural network (CNN) is proposed. By leveraging the advantages of deep learning techniques, it utilizes complementary information from different spectral pre-treatment techniques. The SOC predictions indicated little dissimilarity amongst the different composites, with the best performance attained for the six-year composite containing only spring months (RMSE = 12.03 g C · kg, R = 0.64, RPIQ = 0.89). It has been demonstrated that these outcomes outperform other well-known machine learning techniques. An ablation analysis was accordingly performed to evaluate the interplay of the CNN’s different components to disentangle the advantages of each aspect of the proposed framework. Finally, a DUal inPut deep LearnIng architecture, named DUPLICITE, is proposed, which concatenates deep spectral features derived from the CNN mentioned earlier, as well as topographical and environmental covariates through an artificial neural network (ANN) to exploit their complementarity. The proposed approach was demonstrated to provide an improvement in the overall prediction performance (RMSE = 11.60 gC · kg, R = 0.67, RPIQ = 0.92).

230. 题目: Effects of erosion on macroaggregation, aggregate associated organic carbon sources and compositions in a Mollisol agricultural landscape
文章编号: N24033004
期刊: Catena
作者: Zi Wang, Yumei Peng, Junfei Lv, Jia Shi, Jianying Shang, Xiang Wang
更新时间: 2024-03-30
摘要: Macroaggregation is widely recognized as an important soil carbon (C) stabilization mechanism. However, in eroding landscapes, the relationships among soil aggregation, organic carbon (OC) sources, and chemical composition are poorly understood. In this study, we aimed to explore the effects of erosion and deposition on macroaggregation, OC sources, and chemical compositions in topsoil (0–20 cm) versus subsoil (80–100 cm) in a Mollisol agricultural landscape. The bulk soil was fractionated into macroaggregates (0.25–2 mm), microaggregates (0.053–0.25 mm), and clay and silt (<0.053 mm) using a wet sieving procedure. The plant sources of soil OC were quantified based on the stable isotope C (δC), and the chemical composition of macroaggregate associated OC (MaOC) was determined by solid-state nuclear magnetic resonance techniques. The results indicated that macroaggregates and MaOC comprised 45–72% of soil mass and 50–66% of soil OC, respectively. There was a reduction in macroaggregate-associated C-derived C (C-C) in the eroding position compared to that in the non-eroding position. However, similar amounts of C-derived C (C-C) were detected among three topographical areas, indicating the re-macroaggregation of eroded materials in the depositional position and preferential protection of C-C. In the up-slope positions, topsoil MaOC was composed primarily of O-alkyl C (52%). Compared with the up-slope position, there was a considerable increase in the amount of aromatic C in the erosional macroaggregate fraction. However, at the eroding position, there was a marked increase in the proportion of substituted alkyl-C in the topsoil material, and deposition resulted in an increase in aromatic C in the subsoil. Overall, erosion and deposition change soil aggregation, and sources and composition of OC in different functional pools have important implications for the stabilization of organic matter along an eroding Mollisol hillslope.

231. 题目: Enhanced Photochemical Reactivity of Natural Organic Matter Post-Peroxymonosulfate Oxidation
文章编号: N24033003
期刊: ACS ES&T Water
作者: Teng Zhang, Yuefei Ji, Bin Gao, Hui Lin, Caiming Tang, Junhe Lu
更新时间: 2024-03-30
摘要: Peroxymonosulfate (PMS) is commonly used as sulfate radical precursor in advanced oxidation processes, employed for wastewater treatment and remediating polluted subsurface. Here, we demonstrated that unactivated PMS can directly oxidize natural organic matter (NOM), resulting in the enhanced formation of excited triplet NOM (3NOM*), singlet oxygen (1O2), and hydroxyl radical (•OH) upon exposure to ultraviolet (UV)-A irradiation. UV spectroscopic characterization and electron-donating capacity (EDC) measurement unveiled a notable decrease in aromaticity, molecular weight, and EDC. The quantum yields of 3NOM*, 1O2, and •OH exhibited positive correlations with E2/E3 (ratio of absorbance at 254 to 365 nm), while displaying negative correlations with specific UV absorbance at 254 nm (SUVA254) and EDC after PMS treatment. Fourier transform infrared spectroscopic analysis and a model compound study suggested that the rise in aromatic ketone compounds contributed to the heightened photochemical reactivity following PMS oxidation. Furthermore, Fourier transform ion cyclotron resonance mass spectrometry results revealed that aromatic ketones and quinones can be formed by PMS reactions with alkylbenzene and phenol moieties in NOM. These findings highlight the potential oxidizing capacities of PMS on NOM molecules. The alterations in NOM characteristics bear significance for the degradation of micropollutants in sunlit surface waters.

232. 题目: Impact of climate change on formation of nitrogenous disinfection by-products. Part II: water blooming and enrichment by humic substances
文章编号: N24033002
期刊: Environmental Science and Pollution Research
作者: Argyri Kozari, Spyros Gkellis, Dimitra Voutsa
更新时间: 2024-03-30
摘要:

Climate change affects the concentration and characteristics of dissolved organic matter (DOM) in surface water. The changes in composition of DOM have many implications to drinking water quality, especially in the case of formation of disinfection by-products (DBPs). The aim of this study was to investigate the formation of nitrogenous DBPs (N-DBPs) during chlorination and chloramination, caused by the alternation of surface water’s DOM driven by climate change. For this reason, two different cases were examined: (a) rise of algal organic matter (AOM) due to water blooming and (b) water enrichment by humic substances. The target compounds were haloacetonitriles (HANs), haloacetamides (HAcAms), and halonitromethane (TCNM). The results showed that Anabaena appears to be a major precursor for HAcAms and TCNM, while humic acids are precursors for HANs. The results of the mixtures presented the same pattern. During the water blooming case, HAcAms and TCNM formation are in favor, while during water enrichment by humic substances case, HANs is the N-DBP group with higher formation yield. Cloraminated samples presented higher values of cytotoxicity and genotoxicity compared to the chlorinated.

Graphical

233. 题目: Chemodiversity in freshwater health
文章编号: N24033001
期刊: Science
作者: Andrew J Tanentzap, Jérémy A Fonvielle
更新时间: 2024-03-30
摘要: Freshwater ecosystems, such as lakes and rivers, have been deteriorating in many places worldwide (1). Growing research suggests that many aspects of freshwater health—that is, the maintenance of chemical, physical, and biological integrity—may depend on the composition of dissolved organic matter (DOM) (2). DOM consists of thousands of distinct organic compounds that mainly originate from different plant and animal remains. The resulting variety of compounds in DOM has been called chemodiversity to mirror the term biodiversity. Whereas past research tested how the environment shapes the chemodiversity of DOM (3, 4), a new research frontier is understanding how healthy ecosystems may depend on chemodiversity so as to monitor and reverse declines in freshwater health.

234. 题目: Degrading surface-water-based natural organic matter and mitigating haloacetonitrile formation during chlorination: Comparison of UV/persulfate and UV/hydrogen peroxide pre-treatments
文章编号: N24032920
期刊: Chemosphere
作者: Yuichiro Murata, Hiroshi Sakai, Koji Kosaka
更新时间: 2024-03-29
摘要: Haloacetonitriles (HANs) are unregulated disinfection by-products that are more toxic than regulated species. Therefore, efficient decomposition of HAN precursors prior to disinfection is crucial for allaying the potential HAN-induced health risks. This study investigated the key roles of ultraviolet-activated persulfate (UV/PS) treatment in alleviating HAN formation. The effects of UV/PS treatment were evaluated by correlating with the characteristics of organic matter in surface water and comparing with conventional UV/HO treatment. Upon irradiating raw water samples and a Suwannee River humic acid solution spiked with 10 mM PS or HO with 254 nm UV light, UV/PS treatment was found to be more potent than UV/HO in mitigating the HAN production and degrading organic substances; moreover, UV/PS treatment effectively decreased the dissolved organic nitrogen (DON) content. In contrast, UV/HO treatment did not induce any noticeable reduction in DON level. Furthermore, both UV/PS and UV/HO treatments reduced the dichloroacetonitrile (DCAN) formation potential (FP), leading to strong correlations with the degradation of aromatic and humic-acid-like compounds. Notably, UV/PS treatment efficiently decreased the FP of bromochloroacetonitrile (BCAN) and dramatically reduced that of dibromoacetonitrile (DBAN) after a sharp increase; however, UV/HO treatment gradually increased the DBAN-FP. Bromide was activated by sulfate radicals during UV/PS treatment, negatively correlating with the BCAN-FP and DBAN-FP, indicating that the formation of reactive bromine species increased the DBAN-FP; however, excessive oxidation possibly led to the recovery of inorganic bromine for decreasing the BCAN-FP and DBAN-FP. Additionally, UV/PS treatment effectively suppressed toxicity owing to its high reduction rate for brominated HANs; in contrast, UV/HO treatment resulted in less significant BCAN and DBAN reductions, leading to minimal net reduction in toxicity. Overall, UV/PS treatment was remarkably effective at diminishing the toxicity of brominated HANs, underscoring its potential to mitigate drinking-water-related health risks.

235. 题目: Deciphering the behavior and potential mechanism of biochar at different pyrolysis temperatures to alleviate membrane biofouling
文章编号: N24032919
期刊: Science of the Total Environment
作者: Xiaohuan Yang, Silian Xia, Litu Hao, Duanyun Tian, Lianxu Wang, Rong Chen
更新时间: 2024-03-29
摘要: Biofouling limits applications of membrane technology in wastewater treatment, but dosing additives to membrane tanks is an effective method to alleviate biofouling. In this study, biochar derived from corncob and pyrolyzed at 300, 500, and 700°C was dosed to determine the underlying anti-biofouling mechanism. The effects of the biochar on the membrane properties and foulant behavior were systematically investigated. The results showed that biochar delayed the occurrence of the fouling transition (0.5–3.0 h), and decreased the flux decline rate, thus achieving a higher water flux (3.1–3.7 times of the control group). Biochar altered membrane surface properties, and increased the membrane surface charge, roughness, and hydrophilicity, which all contributed to higher membrane permeability. Moreover, adding biochar reduced the number of foulants in the fouling layer, particularly protein substances. The flux model fit and the XDLVO theory further revealed the mitigating effect of biochar on membrane biofouling. At the initial intermediate-blocking stage, the effect of biochar on membrane fouling was determined by its properties, and adsorption capacity to the foulants, BC500 presented the best mitigation performance. At the later cake-filtration stage, the role of biochar in membrane fouling was strongly associated with protein content in the fouling layer, and the minimum rate of flux decline occurred in BC300. This study promotes the understanding and development of biochar to alleviate membrane biofouling.

236. 题目: Spatial heterogeneity of sedimentary organic matter sources in the Yangtze River estuary: Implications from fatty acid biomarkers
文章编号: N24032918
期刊: Marine Pollution Bulletin
作者: Yunhui Wang, Ni Su, Ergang Lian, Rui Wang
更新时间: 2024-03-29
摘要: This study investigated the sources of sedimentary organic matter (OM) in the Yangtze River estuary (YRE), using multiple biomarkers. The results of stable carbon isotope (δC) and total organic carbon to nitrogen ratio (TOC/TN) suggests the contribution of marine-derived OM significantly increased seawards, while fatty acid (FA) composition provides more specific information on OM sources. In total, 30 components of FAs were identified at the studied 17 sites, which mainly composed of phytoplankton FA, followed by ubiquitous FA and bacterial FA, while terrestrial FA contributed less to the total FAs. Under the strong impacts of the large physicochemical gradients in the YRE, TOC, TN and FA components showed higher concentrations in the estuary mixing zone (especially within the turbidity maximum zone), attributing to their strong binding with OM-enriched fine particles. The spatial heterogeneity of sedimentary OM sources was highly impacted by salinity and Chl-, as well as bacteria-mediated OM degradation.

237. 题目: Dissolved organic matter influences the indigenous bacterial community and polycyclic aromatic hydrocarbons biodegradation in soils
文章编号: N24032917
期刊: Science of the Total Environment
作者: Lei Tang, Jiayi Yan, Xian Zhou, Jian Wang, Yanzheng Gao, Ahmed Mosa, Bozena Czech, Patryk Oleszczuk, Wanting Ling
更新时间: 2024-03-29
摘要: In polycyclic aromatic hydrocarbon (PAH) contaminated soils, bioremediation is superior to other strategies owing to its low cost and environmental friendliness. However, dissolved organic matter (DOM) and indigenous bacterial communities can affect the efficiency of PAH-degrading bacteria (PDB). This study found that exogenous PDB (C1) including the genera , , and , decreased the bacterial diversity of Alfisol, Ultisol, Inceptisol, and Mollisol, and DOM enhanced the diffusion of PDB and the bioavailability of PAH. In addition, bacteria preferred to ingest low molecular weight DOM fractions, and the abundances of lipid-like and protein-like substances decreased by 0.12–3.03 % and 1.73–4.60 %. The DOM fractions had a more marked influence on the indigenous bacteria than the exogenous PDB, and PDB dominated the PAH biodegradation process in the soils. More COO functional groups promoted the utilization of higher molecular weight-related homologue fractions by bacteria, and lower molecular weight fractions carrying more CH functional groups declined during biodegradation. This study investigated the variations in bacterial communities during biodegradation and revealed the effects of DOM fractions on biodegradation in PAH-contaminated soils at the molecular level. These results will promote the development of bioremediation strategies for organics-contaminated soil and provide guidance for prediction models of soil biodegradation kinetics.

238. 题目: Impact of organic carbon on sulfide-driven autotrophic denitrification: Insights from isotope fractionation and functional genes
文章编号: N24032916
期刊: Water Research
作者: Mengjia Zhan, Wei Zeng, Congcong Wu, Gangxin Chen, Qingan Meng, Xiaojing Hao, Yongzhen Peng
更新时间: 2024-03-29
摘要: Additional organics are generally supplemented in the sulfide-driven autotrophic denitrification system to accelerate the denitrification rate and reduce sulfate production. In this study, different concentrations of sodium acetate (NaAc) were added to the sulfide-driven autotrophic denitrification reactor, and the S accumulation increased from 7.8% to 100% over a 120-day operation period. Batch experiments revealed a threefold increase in total nitrogen (TN) removal rate at an Ac-C/N ratio of 2.8 compared to a ratio of 0.5. Addition of organic carbon accelerated denitrification rate and nitrite consumption, which shortened the emission time of NO, but increased the NO production rate. The lowest NO emissions were achieved at the Ac-C/N ratio of 1.3. Stable isotope fractionation is a powerful tool for evaluating different reaction pathways, with the ε/ε values in nitrate reduction ranging from 0.5 to 1.0. This study further confirmed that isotope fractionation can reveal denitrifying nutrient types, with the ε (isotopic enrichment factor of oxygen)/ε (isotopic enrichment factor of nitrogen) value approaching 1.0 for autotrophic denitrification and 0.5 for heterotrophic denitrification. Additionally, the ε/ε values can indicate changes in nitrate reductase. There is a positive correlation between the ε/ε values and the abundance of the functional gene A, and a negative correlation with the abundance of the gene G. Moreover, ε and ε were associated with changes in kinetic parameters during nitrate reduction. In summary, the combination of functional gene analysis and isotope fractionation effectively revealed the complexities of mixotrophic denitrification systems, providing insights for optimizing denitrification processes.

239. 题目: Nano La(OH)3 modified lotus seedpod biochar: A novel solution for effective phosphorus removal from wastewater
文章编号: N24032915
期刊: Journal of Environmental Management
作者: Lingyan Liu, Yifeng Lu, Mingcheng Du, Qiuwen Chen, Hanlu Yan, Yuqing Lin
更新时间: 2024-03-29
摘要: Effective removal of phosphorus from water is crucial for controlling eutrophication. Meanwhile, the post-disposal of wetland plants is also an urgent problem that needs to be solved. In this study, seedpods of the common wetland plant lotus were used as a new raw material to prepare biochar, which were further modified by loading nano La(OH) particles (LBC-La). The adsorption performance of the modified biochar for phosphate was evaluated through batch adsorption and column adsorption experiments. Adsorption performance of lotus seedpod biochar was significantly improved by La(OH) modification, with adsorption equilibrium time shortened from 24 to 4 h and a theoretical maximum adsorption capacity increased from 19.43 to 52.23 mg/g. Moreover, LBC-La maintained a removal rate above 99% for phosphate solutions with concentrations below 20 mg/L. The LBC-La exhibited strong anti-interference ability in pH (3–9) and coexisting ion experiments, with the removal ratio remaining above 99%. The characterization analysis indicated that the main mechanism is the formation of monodentate or bidentate lanthanum phosphate complexes through inner sphere complexation. Electrostatic adsorption and ligand exchange are also the mechanisms of LBC-La adsorption of phosphate. In the dynamic adsorption experiment of simulated wastewater treatment plant effluent, the breakthrough point of the adsorption column was 1620 min, reaching exhaustion point at 6480 min, with a theoretical phosphorus saturation adsorption capacity of 6050 mg/kg. The process was well described by the Thomas and Yoon–Nelson models, which indicated that this is a surface adsorption process, without the internal participation of the adsorbent.

240. 题目: Promoting nitrogen conversion in aerobic biotransformation of swine slurry with the co-application of manganese sulfate and biochar
文章编号: N24032914
期刊: Journal of Environmental Management
作者: Xuan Wu, Xinyu Zhao, Guorong Yi, Wanqiang Zhang, Runyu Gao, Daniel Kuok Ho Tang, Ran Xiao, Zengqiang Zhang, Yiqing Yao, Ronghua Li
更新时间: 2024-03-29
摘要: This study aimed to explore the co-application of MnSO4 (Mn) and biochar (BC) in nitrogen conversion during the composting process. A 70-day aerobic composting was conducted using swine slurry, supplemented with different levels of Mn (0, 0.25%, and 0.5%) and 5% BC. The results demonstrated that the treatment with 0.5MnBC had the highest levels of NH4+-N (3.07 g kg−1), TKN (29.90 g kg−1), and NO3−-N (1.94 g kg−1) among all treatments. Additionally, the 0.5MnBC treatment demonstrated higher urease, protease, nitrate reductase, and nitrite reductase activities than the other treatments, with the peak values of 18.12, 6.96, 3.57, and 15.14 mg g−1 d−1, respectively. The addition of Mn2+ increased the total organic nitrogen content by 29.59%–47.82%, the acid hydrolyzed ammonia nitrogen (AN) content by 13.84%–57.86% and the amino acid nitrogen (AAN) content by 55.38%–77.83%. The richness of Chloroflexi and Ascomycota was also enhanced by the simultaneous application of BC and Mn. Structural equation modeling analysis showed that Mn2+ can promote the conversion of Hydrolyzed Unknown Nitrogen (HUN) into AAN, and there is a positive association between urease and NH4+-N according to redundancy analysis. Firmicutes, Basidiomycota, and Mortierellomycota showed significant positive correlations with ASN, AN, and NH4+-N, indicating their crucial roles in nitrogen conversion. This study sheds light on promoting nitrogen conversion in swine slurry composting through the co-application of biochar and manganese sulfate.

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