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41. 题目: Effect of phosphates on oxidative species generation and sulfamethoxazole degradation in a pig manure derived biochar activated peroxymonosulfate system
文章编号: N22051907
期刊: Separation and Purification Technology
作者: Chuanbin Wang, Yanshan Wang, Yang Yu, Xiaoqiang Cui, Beibei Yan, Yingjin Song, Ning Li, Guanyi Chen, Shaobin Wang
更新时间: 2022-05-19
摘要: The peroxymonosulfate (PMS) oxidation processes have received considerable attention for water treatment. The influence of monohydrogen phosphate and dihydrogen phosphate on PMS system is still controversial. A biochar activated PMS system was constructed to investigate the HPO42−/H2PO4− effects on sulfamethoxazole degradation. Results showed that the presence of H2PO4− inhibited PMS activation, while the co-existing HPO42− played a positive role. Therefore, it might be inaccurate to assess the activation capacity of a catalyst for PMS activation when using phosphate as a buffer solution. Importantly, H2PO4− inhibited the function of C=O, pyridine N and defects for PMS activation. However, HPO42− promoted C=O and graphitic N sites for sulfamethoxazole (SMX) degradation. The contributions of ·OH and SO4•− to SMX degradation decreased with the increase of H2PO4− concentration. The production of SO4•− was accelerated with the increase of HPO42− concentration, promoting pollutants degradation. The contribution of 1O2 first increased and then decreased with the rise of HPO42−/H2PO4− concentration. This study elucidated the roles of H2PO4− and HPO42− in PMS system and revealed the corresponding specific influence mechanisms, promoting the application of PMS systems for antibiotic wastewater purification.

42. 题目: Biologically induced phosphate precipitation in heterotrophic nitrification processes of different microbial aggregates: influences of nitrogen removal metabolisms and extracellular polymeric substances
文章编号: N22051906
期刊: Bioresource Technology
作者: Ziyuan Lin, Lei He, Jian Zhou, Shuohui Shi, Xuejie He, Xing Fan, Yingmu Wang, Qiang He
更新时间: 2022-05-19
摘要: Phosphorus (P) removal occurred in heterotrophic nitrification process, but its mechanism has not been fully explored. In this study, the P removal performances, pathways, and mechanisms in heterotrophic nitrification processes of different microbial aggregates (activated sludge and biofilm) were investigated. The results showed that the biofilm reactor had more efficient total nitrogen removal (98.65%) and phosphate removal (94.17%). Heterotrophic nitrification and denitrification processes generated alkalinity for biologically induced phosphate precipitation (BIPP), which contributed to 64.12%-78.81% of the overall P removal. The solid phase P content reached 48.03 mg/gSS with hydroxyapatite and calcium phosphate formation. The study clarified that biofilm was beneficial to BIPP because of the nitrogen removal metabolism and extracellular polymeric substance (EPS). Heterotrophic nitrogen removal metabolism was the driving force of BIPP, while EPS with abundant carboxyl and amide groups promoted the precipitation. The study would provide new insights into simultaneous nutrients removal and P recovery from wastewater.

43. 题目: Characteristics and source apportionment of black carbon aerosol in the North China Plain
文章编号: N22051905
期刊: Atmospheric Research
作者: Zheng Yang, Nan Ma, Qiaoqiao Wang, Guo Li, Xihao Pan, Wenlin Dong, Shaowen Zhu, Shaobin Zhang, Wenwen Gao, Yao He, Linhong Xie, Yuxuan Zhang, Uwe Kuhn, Wangyun Xu, Ye Kuang, Jiangchuan Tao, Juan Hong, Guangsheng Zhou, Yele Sun, Hang Su, Yafang Cheng
更新时间: 2022-05-19
摘要: In this study, the physical properties of refractory BC (rBC) including mass concentration, core size distribution and mixing state were in-situ characterized with a single particle soot photometer (SP2) at a polluted rural site in the North China Plain in November 2018. The average rBC mass concentration is 4.12 ± 2.47 μg m−3, accounting for 6.26% of PM1 mass. Its diurnal variation shows that the rBC concentration is affected by both the local residential activities and the evolution of planetary boundary layer (PBL). And a broader rBC core mass size distribution (CMSD) can be observed in the afternoon. The CMSD show a primary mode with peak diameter (Dm) of ~222 nm, and a small secondary mode with Dm of ~687 nm. The average absolute coating thickness (ACT) of rBC particles is 50 nm and the bulk relative coating thickness (BRCT) is about 1.7, indicating a relatively high aging level of rBC. The correlation analysis between SP2-separated rBC and PMF-separated OA factors indicate that rBC with different core size (Dc) and ACT may be originated from different sources. The rBC contributed by coal combustion is distributed throughout a large Dc range (~70–500 nm). The rBC particles emitted by traffic sources have small core sizes and thin coating thickness (Dc < 180 nm and ACT <50 nm); while the rBC particles emitted from biomass burning show a higher degree of aging (ACT >250 nm). In addition, the secondary mode rBC particles are likely to be originated from coal combustion.

44. 题目: Light-induced coupling process of Fe redox cycling and natural dissolved organic matters oxidative decomposition at goethite surface: Key role of reactive oxidative species
文章编号: N22051904
期刊: Chemical Geology
作者: Shanshan Yang, Xiao Ge, Yanzhang Li, Hongrui Ding, Yan Li, Changqiu Wang, Anhuai Lu
更新时间: 2022-05-19
摘要: The interactions between widespread iron (oxyhydr)oxides (Fe oxides) and natural soil dissolved organic matters (DOM) are the dominant drivers in the geochemical behavior of Fe and the cycle of carbon in soil. Under visible light irradiation, their interactions become more complex due to the unique semiconducting structure of Fe oxides and complex components in DOM, which have not been deeply studied. In this study, the complex reactions occurred at the DOM-goethite interface under irradiation were investigated in detail. Fe2+(aq) from goethite reductive dissolution was accumulated at the DOM-goethite interface, along with the generation of reactive oxidative species (ROS). The reasons could be ascribed to the enhanced generation of photoelectron from the conduct band of goethite, ligand-to-metal charge transfer and photolysis of Fe(III)-carboxylate complexes. Moreover, the generated ROS were the main driving forces in the coupling process of Fe redox cycle and oxidative decomposition of DOM at goethite surface, inducing the formation of secondary Fe minerals and chemical composition change of DOM. This work provided new insights into the light-induced coupling process of Fe semiconducting minerals reductive dissolution and dissolved organic matters oxidation in top soil.

45. 题目: Cost-effective desulfurization of acid mine drainage with food waste as an external carbon source: A pilot-scale and long-term study
文章编号: N22051903
期刊: Journal of Cleaner Production
作者: Jia Yan, Fan Luo, Lingyao Wu, Yinglin Ou, Changchen Gong, Tianwei Hao, Lei Huang, Yongheng Chen, Jianyou Long, Tangfu Xiao, Hongguo Zhang
更新时间: 2022-05-19
摘要: Sulfate reduction process can be a promising method for simultaneously removing sulfate, metals and metalloids from acid mine drainage (AMD). However, organic matter in AMD is far from enough for sulfate reduction, and an additional carbon source is required, which increases operation costs for AMD treatment. In this study, a two stage AMD treatment system was established (chemical precipitation - sulfate reduction), and food waste hydrolysate was utilized as a carbon source for AMD treatment. Simultaneous removal of sulfate, organics, metals and metalloids was observed in a pilot-scale (10 m3) upflow anaerobic sludge bed (UASB) for over 400 days. Introducing of food waste hydrolysate (FWHS) was not harmful for sulfate reducers in UASB. Decomposition of refractory organic matter in AMD was enhanced after FWHS addition, which led to decreasing of COD concentration (50%) in effluents of UASB. Ten out of 17 organic matter in effluents was no longer detected after FWHS addition. Metals and metalloids from both AMD and FWHS were efficiently removed during the sulfate reduction process (97.7–100%). Volatile fatty acids (acetic and valeric acids) produced during the food waste hydrolysis could be utilized as carbon source for AMD treatment. Interactions among fermentative microbes, sulfate reducers, denitrifiers and methanogens enhanced carbon, sulfur and nitrogen removal in the UASB. Therefore, a cost-effective method for AMD and food waste cotreatment (3.6 kgSO42−/kgTS food waste) was established in this study by reducing carbon source addition (100%), biomass production (93%), VFA production (54.5%) and sulfide emission (50%), which might be applied for AMD recycling at mining sites.

46. 题目: Optical properties, chemical functional group, and oxidative activity of different polarity levels of water-soluble organic matter in PM2.5 from biomass and coal combustion in rural areas in Northwest China
文章编号: N22051902
期刊: Atmospheric Environment
作者: Shasha Huang, Yu Luo, Xin Wang, Tian Zhang, Yali Lei, Yaling Zeng, Jian Sun, Huizheng Che, Hongmei Xu, Junji Cao, Zhenxing Shen
更新时间: 2022-05-19
摘要: Biomass and coal combustion are major sources of water-soluble organic matter (WSOM) in PM2.5. This study investigated the carbon content, light absorption capacity, molecular structures, and oxidative activity of three types of WSOM (neutral humic-like substances (HULIS-n), acidic HULIS (HULIS-a), and high-polarity WSOM (HP-WSOM)) produced from biomass and coal combustion in Northwest China. The carbon emission factors of HULIS-n, HULIS-a, and HP-WSOM were 5.52 ± 4.29, 3.82 ± 2.83, and 3.24 ± 2.85 g/kg from biomass burning, and 1.77 ± 0.65, 4.41 ± 1.24, and 3.94 ± 1.78 g/kg from coal combustion, respectively. HULIS-n had the highest light absorption coefficient at 365 nm (babs-365) and the mass absorption efficiency at 365 nm (MAE365) both for biomass and coal burning, suggesting that HULIS-n contains more chromophores than the others. The Fourier transform infrared spectra results revealed that aromatic substances and polysaccharides were predominated in HULIS-n and HP-WSOM. Reactive oxygen species (ROS) in coal combustion followed a decreasing order of HULIS-n > HP-WSOM > HULIS-a. In terms of WSOM from biomass combustion, the highest ROS was in HULIS-n for corn straw and wheat straw in fire kangs but the highest ROS was in HP-WSOM for pepper rod and sesame rod in hanging stoves as well as wood block fire. HULIS-a produced by HS of biomass burning had higher ROS activity, and oxidative activity of HULIS-n produced by burning biomass by HB and SS did not differ greatly. High ROS and strong light absorption of HULIS-n in both biomass burning and coal burning may attribute to its molecular structures such as abundance of R–ONO2 organic nitrate. Our results also highlighted that the carbon content of HULIS-n occupied only 17.5% to HULIS + HP-WSOM in coal combustion, whereas HULIS-n contributed up to 58.3% and 64.8% of the total light absorption and ROS. Overall, this study revealed the complex emission properties of WSOM, which would improve the assessment of their environmental and climate impacts at a regional scale.

47. 题目: Atomically Dispersed Manganese on Biochar Derived from a Hyperaccumulator for Photocatalysis in Organic Pollution Remediation
文章编号: N22051901
期刊: Environmental Science & Technology
作者: Peixin Cui, Cun Liu, Xiaozhi Su, Qiang Yang, Liqiang Ge, Meiying Huang, Fei Dang, Tongliang Wu, Yujun Wang
更新时间: 2022-05-19
摘要: Phytoremediation is a potentially cost-effective and environmentally friendly remediation method for environmental pollution. However, the safe treatment and resource utilization of harvested biomass has become a limitation in practical applications. To address this, a novel manganese-carbon-based single-atom catalyst (SAC) method has been developed based on the pyrolysis of a manganese hyperaccumulator, Phytolacca americana. In this method, manganese atoms are dispersed atomically in the carbon matrix and coordinate with N atoms to form a Mn–N4 structure. The SAC developed exhibited a high photooxidation efficiency and excellent stability during the degradation of a common organic pollutant, rhodamine B. The Mn–N4 site was the active center in the transformation of photoelectrons via the transfer of photoelectrons between adsorbed O2 and Mn to produce reactive oxygen species, identified by in situ X-ray absorption fine structure spectroscopy and density functional theory calculations. This work demonstrates an approach that increases potential utilization of biomass during phytoremediation and provides a promising design strategy to synthesize cost-effective SACs for environmental applications.

48. 题目: Distribution Characteristics of Soil Particles and Their Relationships With Soil Organic Carbon Components in the Alluvial/Sedimentary Zone in the Lower Reaches of the Yellow River
文章编号: N22051818
期刊: Frontiers in Environmental Science
作者: Junhua Zhang, Guodong Li, Shengyan Ding, Huiwen Tian, Xiaojuan Ren, Man Liu, Yaping Zheng
更新时间: 2022-05-18
摘要: Land use and sediment alluviation/deposition are the main factors influencing the vertical distributions of particles with different sizes and soil organic carbon (SOC) forms. Based on field investigation, experimental analysis, data analysis, soil particle characteristics, and the relationships with SOC compositions are studied in the typical alluviation/deposition area of Kaifeng–Zhoukou. In the soil profile, the particulate matter is mainly 10–50 μm and 50–250 μm in size with an average content of approximately 65%, the content difference within the same size particle range is small. There is a large content range of <1,000 μm particles, which is the main factor affecting the change in soil properties. The fractal dimension ( D ) of soil particles ranges from 2.21 to 2.78. The value of D of each layer in farmland is higher than that of each layer in woodland, and it has been observed that D NF(farmland in the nonflooded area) > D F(farmland in the flooded area) and D NW(woodland in the nonflooded area) > D W(farmland in the nonflooded area) . The contents of particles smaller than 50 μm have a positive effect on D , and the particles exceeding 50 μm have a negative effect. The contents of 10–50 μm, <2 μm, 2–5 μm, and 5–10 μm particles and their dynamic variances are the root causes of the D differences in the farmland/woodland soil in the FA (the flooded area) and NFA (the nonflooded area). SOC components combine to a greater extent with silt and clay that are <10 μm in size in the NF, and the stability is relatively high. The contents of the 10–50 μm and <10 μm particles are the main reasons for the differences in the soil active and nonactive organic carbon (AOC and NOC, respectively) contents in the FA and the NFA. The difference in D can reflect the change in SOC and its components and can be used as an index to characterize the variance in soil properties and quality. This study revealed the influences of the different particle sizes in the SOC components, which will expand and enrich the current area of study and further provide a basis to increase SOC and improve soil quality.

49. 题目: Visible-light-driven photocatalytic degradation of dye and antibiotics by activated biochar composited with K+ doped g-C3N4: Effects, mechanisms, actual wastewater treatment and disinfection
文章编号: N22051817
期刊: Science of The Total Environment
作者: Tongtong Wang, Jiyong Zheng, Jinjun Cai, Qiangqiang Liu, Xianxia Zhang
更新时间: 2022-05-18
摘要: To improve the performance of graphitic carbon nitride (g-C3N4), a hotly researched metal-free photocatalyst, for better application in the efficient removal of organic pollutants, adsorption synergistically enhanced photocatalysis mechanism was thoroughly explored. Based on KOH pore-forming activated biochar (ACB) and K+ doped g-C3N4 (K-gC3N4), the novel activated biochar-based K-gC3N4 composite (ACB-K-gC3N4) was synthesized via the innovative ultrasonic-milling method. Rhodamine B (RhB), tetracycline (TC), norfloxacin (NOR), and chloramphenicol (CAP) were selected as target pollutants, and the effects of environmental factors, recycling and actual wastewater tests, disinfection effects, and various enhancement strategies were investigated. The results showed that K-gC3N4 was successfully composited with ACB by various characterizations, where the loading mass ratio of 1:2 exhibited the best performance. ACB-K-gC3N4 possessed a larger specific surface area, richer functional groups, suitable band gap (2.29 eV), and broader visible light absorption (~716 nm) than K-gC3N4. ACB-K-gC3N4 presented effective removal efficiency over K-gC3N4 for four pollutants, in which the removal efficiency of RhB reached 93.26%, and the degradation rate constant of 0.0119 min−1 was four times higher than K-gC3N4 (0.0029 min−1). Moreover, ACB-K-gC3N4 was superior to K-gC3N4 in disinfecting S. aureus and E. coli, with a sterilization rate of exceeding 90% for 12 h. The photodegradation activity was dominated by ·O2−, h+, and ·OH, and the mechanisms involved in the three stages. This was attributed to the unique structure and surface properties (defects and persistent free radicals) of ACB, as evidenced by improved adsorption stage and transfer of degradation intermediates, facilitated the generation of active species, accelerated migration of photogenerated electrons, and inhibited photogenerated carriers recombination by the heterojunction. The good reusability and stability, enhancement strategies (blowing air and heating), and satisfactory feasibility for actual wastewater allow ACB-K-gC3N4 possible to promote high-concentration wastewater treatment and disinfection.

50. 题目: Remediation of organic amendments on soil salinization: Focusing on the relationship between soil salts and microbial communities
文章编号: N22051816
期刊: Ecotoxicology and Environmental Safety
作者: Xiaoxi Mao, Yang Yang, Peibin Guan, Liping Geng, Li Ma, Hongjie Di, Wenju Liu, Bowen Li
更新时间: 2022-05-18
摘要: Soil salinization has emerged as a major factor with an adverse influence on agricultural green development worldwide. It is necessary to develop high-efficiency and ecologically beneficial management measures for alleviating soil salinization. The experiment of application for cow manure (CM), biochar (BC), and bio-organic fertilizer (BIO) in soil with light salinity was conducted to investigate the remediation of organic materials on soil salinization with melon (Cucumis melo L.) by reducing the availability of saline ions and shifting the soil microbial community. Results showed that BC treatment significantly decreased the EC values of the soil and soil solution by 19.23% and 27.02% and the concentrations of Na+, K+, and Cl- by 13.28%, 13.08%, and 15.21%, respectively, followed by CM and BIO treatments. High-throughput sequencing identified that organic amendments significantly improved the richness of the soil bacterial community and increased the relative abundances of Acidobacteria and Firmicutes by 33.11% and 111.2%, respectively, and the beneficial salt-tolerant bacterial genera Flavobacterium, Bacillus and Arthrobacter by 32.04%, 38.92% and 35.67%, respectively. Additionally, soil Na+, Ca2+, K+ and Cl- were significantly negatively correlated with Acidobacteria and Flavobacterium and were also the most important factors driving the changes in the structure of the soil bacterial communities. The bacterial networks were more complex in the organic amendments treatments than in CK, reflecting through more nodes and links and a higher average clustering coefficient, density and modularity. This study provided a comprehensive understanding of the application of organic amendments in alleviating soil salinization and improving soil bacterial and fungal communities and provides scientific support for agriculture green development.

51. 题目: Hydrothermal treatment of food waste for bio-fertilizer production: Formation and regulation of humus substances in hydrochar
文章编号: N22051815
期刊: Science of The Total Environment
作者: Lixian Wang, Yong Chi, Kun Du, Zhaozhi Zhou, Fei Wang, Qunxing Huang
更新时间: 2022-05-18
摘要: Food waste (FW) poses serious challenges to incineration and composting. Hydrothermal treatment (HTT) is a promising method to produce carbon-rich materials from biomass, including humus substances. In this study, FW containing cellulose, starches, and proteins was treated by HTT to study the formation and regulation of three kinds of humus (i.e., humin, humic acids [HAs], and fulvic acids [FAs]). Ultimate analysis and proximate analyses were conducted to explore the material composition, which was very similar to natural humus. Three kinds of humus were quantified. Optimal temperature (200 °C) and residence time (30 min) for production of HAs were determined based on HAs yield (14.60%). In addition, formation and regulation of humin, HAs and FAs was discussed. The amino acids, peptides, monosaccharides, and HMF obtained by hydrolysis of FW produced important precursors of humus. Moreover, the transfer of nutrient elements was revealed. Nearly 90% of K was dissolved in water. Recovery of N (60%) was relatively stable in hydrochar. Up to 67.61% of P deposited in hydrochar with 12 h.

52. 题目: Influence of Methyl Groups in Triphenylmethane Dyes on Their Adsorption on Biochars from Coffee Husks
文章编号: N22051814
期刊: Water, Air, & Soil Pollution
作者: Amanda Eugênio de Castro, Felipe da Silva Martinho, Mylene Lourdes Barbosa, José Romão Franca, Jenaina Ribeiro-Soares, Gabriel Max Dias Ferreira, Guilherme Max Dias Ferreira
更新时间: 2022-05-18
摘要: Biochars (BC), whose properties are highly dependent on the pyrolysis temperature used, have been proposed for the efficient removal of a variety of contaminants from wastewater. In this work, pristine biochars were produced by the pyrolysis of coffee husks at temperatures of 400, 500, 750, and 900 °C, for use in the adsorption of pararosaniline (PRA) and methyl violet 10B (MV10B), which are triphenylmethane dyes with similar structures, but different numbers of methyl groups. The biochars were characterized and the dye adsorption kinetics and equilibria were investigated. FTIR and Raman spectroscopy analyses indicated that a higher pyrolysis temperature increased the aromaticity of the biochar surface structure, while decreasing the number of oxygenate functional groups. Higher adsorption capacities were generally observed at pH 7.5, with the maximum adsorption amounts increasing in the order BC900 ≈ BC750 < BC500 < BC400 for both dyes, being 1.3 times higher for PRA on BC400 (97.22 mmol kg−1), but 1.9 times higher for MV10B on BC900 (5.49 mmol kg−1). The Langmuir model provided the best fit to the adsorption isotherms for BC400 and BC900, while the Dubinin–Radushkevich model satisfactorily fitted the isotherms for the other biochars. These results showed that increase of the pyrolysis temperature resulted in a decrease in the number of adsorption sites with which the dyes interacted more favorably by means of hydrogen bonds. Although hydrophobic interactions were not important driving forces for adsorption of the dyes, the higher number of methyl groups in MV10B favored its adsorption on the more hydrophobic biochar.

53. 题目: An innovative circular model for recycling the wastes into biochar using distillation units
文章编号: N22051813
期刊: Journal of Cleaner Production
作者: Mohd. Ahsan, Mayank Singh, Raghvendra Pratap Singh, Vineet Yadav, S Tandon, Binoy K Saikia, Tanmoy Karak, Puja Khare
更新时间: 2022-05-18
摘要: An innovative circular model was examined for the production of biochar in an ash pit (with 432 L volume and 350°–450° temperature) of essential oil distillation unit using different easily farm available feedstocks (13) for the sustainable use of resources and recycling of biomass and animal waste. The study demonstrated that residence time of 120 min was more suitable for biochar production as compared to 180 and 240 min. The biochar produced had 39–60% of yield, alkaline pH, 0.26–1.63 gm−3 bulk density, 11–78% water holding capacity, and 15–124 meq/100 g cation exchange capacity. Biochars from animal waste have greater potential for fertilizer supplements while distilled waste-derived biochar and crop residue can be more effective for carbon sequestration and reduction in greenhouse emissions. The estimated benefits to cost ratio was $ 54 to 2174 for soil application and $32–982 for selling purposes, hence could be sustainable and profitable for the farmers and aroma industry.

54. 题目: Potential of Biochar to Reduce Greenhouse Gas Emissions and Increase Nitrogen Use Efficiency in Boreal Arable Soils in the Long-Term
文章编号: N22051812
期刊: Frontiers in Environmental Science
作者: Subin Kalu, Liisa Kulmala, Jure Zrim, Kenneth Peltokangas, Priit Tammeorg, Kimmo Rasa, Barbara Kitzler, Mari Pihlatie, Kristiina Karhu
更新时间: 2022-05-18
摘要: Biochars have potential to provide agricultural and environmental benefits such as increasing soil carbon sequestration, crop yield, and soil fertility while reducing greenhouse gas (GHG) emissions and nitrogen leaching. However, whether these effects will sustain for the long-term is still unknown. Moreover, these effects were observed mostly in highly weathered (sub-) tropical soils with low pH and soil organic carbon (SOC). The soils in northern colder boreal regions have typically higher SOC and undergo continuous freeze-thaw cycles. Therefore, effects of biochars in these regions may be different from those observed in other climates. However, only a few biochar studies have been conducted in boreal regions. We aimed to assess the long-term effects of biochars on GHG emissions, yield-normalized non-CO 2 GHG emissions (GHGI), and N dynamics in boreal soils. For this, we collected data from four existing Finnish biochar field experiments during 2018 growing season. The experiments were Jokioinen (Stagnosol), Qvidja (Cambisol), Viikki-1 (Stagnosol), and Viikki-2 (Umbrisol), where biochars were applied, 2, 2, 8, and 7 years before, respectively. The GHG emissions, crop yield, soil mineral N, and microbial biomass were measured from all fields, whereas, additional measurements of plant N contents and N leaching were conducted in Qvidja. Biochars increased CO 2 efflux in Qvidja and Viikki-2, whereas, there were no statistically significant effects of biochars on the fluxes of N 2 O or CH 4 , but in Qvidja, biochars tended to reduce N 2 O fluxes at the peak emission points. The tendency of biochars to reduce N 2 O emissions seemed higher in soils with higher silt content and lower initial soil carbon. We demonstrated the long-term effects of biochar on increased crop yield by 65% and reduced GHGI by 43% in Viikki-2. In Qvidja, the significant increment of plant biomass, plant N uptake, nitrogen use efficiency, and crop yield, and reduction of NO 3 − –N leaching by the spruce biochar is attributed to its ability to retain NO 3 − –N, which could be linked to its significantly higher specific surface area. The ability of the spruce biochar to retain soil NO 3 − –N and hence to reduce N losses, has implications for sustainable management of N fertilization.

55. 题目: Influences of summer monsoon variations on the terrigenous influx, bioproductivity and early diagenetic changes in the southwest Bay of Bengal during Late Quaternary
文章编号: N22051811
期刊: Marine Geology
作者: A Prajith, Abhishek Tyagi, P John Kurian
更新时间: 2022-05-18
摘要: The sediment core (MGS11/02), collected from the lower boundary of the Bay of Bengal (BoB) oxygen minimum zone (890 m) is studied to understand the influences of summer monsoon variations on the terrigenous sediment influx and its relation to bioproductivity and early diagenetic changes in the southwest BoB during the Late Quaternary. The high content of terrigenous controlled metals input and changing K/Rb (decreased) and Kaolinite/Chlorite (increased) ratio started at 19 cal kyr BP, indicating a simultaneous increase in the terrigenous influx and intensity of chemical weathering during this period. The variations in summer monsoon and land influx observed in the core sediments are also reflected in the sources of organic matter. High values of δ13C observed at 40 to 19 cal kyr BP suggests higher influence of marine organic matter and/or presence of C4 terrestrial plant. The negative shift of δ13C between 19 and 6 cal kyr BP could be the result of the change in terrestrial plant biomass to C3 photosynthesis and increased marine organic matter. Rock magnetic properties and redox-sensitive metals distribution suggests the prevalence of reduced environment during 52 to 19 cal kyr BP and oxic condition during 19 cal kyr BP to present. The low sedimentation during glacial period allowed sufficient time for pyritization which resulted in the low magnetic signals in the bottom part and led to reducing conditions in the sediment interval. The δ15N values in the core sediments are suggesting the absence of denitrification in the water column during last 52 cal kyr BP. Previous studies suggest that the BoB is a geochemical ‘tipping point’ because the slight changes in water column denitrification by anthropogenic or climatic impact can accelerate BoB nitrogen contribution to the global nitrogen budget. This study indicates the absence of water column denitrification signals during last 52 cal kyr BP even though drastic climatic changes happened in the BoB in the Late Quaternary.

56. 题目: Evaluation of adsorption-elution methods with positively and negatively charged membranes for virus concentration in municipal wastewater:New insight into effects of dissolved organic matter
文章编号: N22051810
期刊: Journal of Environmental Chemical Engineering
作者: Zhen Wang, Chong-Miao Zhang, Chen-Xin Li, Yong-Fu Li, Xiao Mou, Rui You
更新时间: 2022-05-18
摘要: Efficient enrichment is the premise and guarantee for quantitative detection of pathogenic viruses in municipal wastewater. Some naturally occurring organic matter has an impact on the enrichment process because of interference with virus adsorption to the microporous membrane. In this study, the influence of dissolved organic matter (DOM) on the adsorption-elution method utilizing positively and negatively charged membranes for the recovery of bacteriophage MS2 in raw sewage and secondary effluent was investigated. For raw sewage and secondary effluent, the total recovery rate of virus with negatively charged membrane was 7.63% and 24.38% higher than that with positively charged membrane, respectively. Therefore, the adsorption-elution method with negatively charged membrane was suitable for raw sewage and secondary effluent. The recovery rate of elution step was lowest in all stages of adsorption-elution method, so the elution step was limiting step in the recovery of bacteriophage MS2 by adsorption-elution method. Fourier transform infrared spectroscopy (FTIR) with the fluorescence excitation-emission matrix spectroscopy (EEM) analysis revealed that tryptophan was dominant in the raw sewage, and humic acid (HA) was dominant in secondary effluent. Moreover, the surface roughness of the fouled membrane in the presence of tryptophan was higher than that of HA based on the morphology analysis by atomic force microscopy (AFM). According to X-ray photoelectron spectroscopy (XPS) analysis, the contribution of main functional groups in tryptophan and HA to the elution efficiency of bacteriophage MS2 was identified. In addition, the elution of bacteriophage MS2 was easy in the presence of tryptophan due to electrostatic force, and covalent bond / hydrogen bond in the presence of HA make bacteriophage MS2 difficult to be eluted. These findings can offer some evidence and scientific support for the standardization of enrichment methods in the water sample.

57. 题目: Contributions of Fe(III) to UV–Vis absorbance in river water: a case study on the Connecticut River and argument for the systematic tandem measurement of Fe(III) and CDOM
文章编号: N22051809
期刊: Biogeochemistry
作者: Laura A Logozzo, Joseph W Martin, Johnae McArthur, Peter A Raymond
更新时间: 2022-05-18
摘要: Dissolved organic matter (DOM) impacts the structure and function of aquatic ecosystems. DOM absorbs light in the UV and visible (UV–Vis) wavelengths, thus impacting light attenuation. Because absorption by DOM depends on its composition, UV–Vis absorbance is used to constrain DOM composition, source, and amount. Ferric iron, Fe(III), also absorbs in the UV–Vis; when Fe(III) is present, DOM-attributed absorbance is overestimated. Here, we explore how differing behavior of DOM and Fe(III) at the catchment scale impacts UV–Vis absorbance and evaluate how system-specific variability impacts the effectiveness of existing Fe(III) correction factors in a temperate watershed. We sampled five sites in the Connecticut River mainstem bi-weekly for ~ 1.5 years, and seven sites in the Connecticut River watershed once during the summer 2019. We utilized size fractionation to isolate the impact of DOM and Fe(III) on absorbance and show that variable contributions of Fe(III) to absorbance at 254 nm (a 254 ) and 412 nm (a 412 ) by size fraction complicates correction for Fe(III). We demonstrate that the overestimation of DOM-attributed absorbance by Fe(III) is correlated to the Fe(III):dissolved organic carbon concentration ratio; thus, overestimation can be high even when Fe(III) is low. a 254 overestimation is highly variable even within a single system, but can be as high as 53%. Finally, we illustrate that UV-Vis overestimation might impart bias to seasonal, discharge, and land-use trends in DOM quality. Together, these findings argue that Fe(III) should be measured in tandem with UV–Vis absorbance for estimates of CDOM composition or amount.

58. 题目: Influence of algal organic matter on metal accumulation in adjacent sediments of aquaculture from a tropical coast region
文章编号: N22051808
期刊: Environmental Science and Pollution Research
作者: Shiquan Chen, Ke Pan, Wenqin Li, Dandan Duan
更新时间: 2022-05-18
摘要: The rapid development of coastal aquaculture in recent decades has led to excessive discharge of organic matter and nutrients into surrounding waters, which could result in eutrophication and potentially affect metal cycling. In our study, the influence of algal organic matter on metal accumulation was examined in three coastal sediment cores taken from a tropical region, Hainan Island, China. Overall, metal pollution adjacent to aquaculture ponds remained at low levels on the coast, except Zn, Cd, and Sn were moderately to highly enriched in the Dongjiao sediments. The δ13C values and the atomic C/N ratios indicated a major contribution of phytoplankton to sedimentary organic matter at the Dongjiao site. Moreover, both the algae-derived organic matter and effluent nitrogen were significantly associated with the enriched Zn, Cd, and Sn, suggesting that nutrient-induced phytoplankton growth and its organic matter may act as a “biological pump” to enhance the accumulation of metals. Wastewater treatment for aquaculture ponds should include the control of algal organic matter.

59. 题目: The Role of Dissolved Organic Matter During Per- and Polyfluorinated Substance (PFAS) Adsorption, Degradation, and Plant Uptake: A Review
文章编号: N22051807
期刊: Journal of Hazardous Materials
作者: Yuwen Qi, Huimin Cao, Weijie Pan, Cuiping Wang, Yanna Liang
更新时间: 2022-05-18
摘要: The negative effects of polyfluoroalkyl substances (PFAS) on the environment and health have recently attracted much attention. This article reviews the influence of soil- and water-derived dissolved organic matter (DOM) on the environmental fate of PFAS. In addition to being co-adsorped with PFAS to increase the adsorption capacity, DOM competes with PFAS for adsorption sites on the surface of the material, thereby reducing the removal rate of PFAS or increasing water solubility, which facilitates desorption of PFAS in the soil. It can quench some active species and inhibit the degradation of PFAS. In contrast, before DOM in water self-degrades, DOM has a greater promoting effect on the degradation of PFAS because DOM can complex with iron, iodine, among others, and act as an electron shuttle to enhance electron transfer. In soil aggregates, DOM can prevent microorganisms from being poisoned by direct exposure to PFAS. In addition, DOM increases the desorption of PFAS in plant root soil, affecting its bioavailability. In general, DOM plays a bidirectional role in adsorption, degradation, and plant uptake of PFAS, which depends on the types and functional groups of DOM. It is necessary to enhance the positive role of DOM in reducing the environmental risks posed by PFAS. In future, attention should be paid to the DOM-induced reduction of PFAS and development of a green and efficient continuous defluorination technology.

60. 题目: The effect of carbonization temperature on the capacity and mechanisms of Cd(II)-Pb(II) mix-ions adsorption by wood ear mushroom sticks derived biochar
文章编号: N22051806
期刊: Ecotoxicology and Environmental Safety
作者: Yining Ji, Na Zheng, Qirui An, Siyu Sun, Sujing Wang, Xiaoqian Li, Pengyang Li, Xiuyi Hua, Deming Dong, Chunmei Zhao, Zimeng Li, Wenhui Zhang
更新时间: 2022-05-18
摘要: Heavy metals often coexist in contaminated environmental media, and competition between heavy metals for adsorption sites influences the absorption capacity of biochar. In this study, the adsorption mechanism of pyrolytically modified wood ear mushroom sticks (250, 450, and 650 °C) as a new bio-adsorbent for single-ion and mixed-ion solutions Cd2+ and Pb2+ Biochar adsorption experiments showed that the adsorption abilities of Cd2+ and Pb2+ increased with increasing WMBC (wood ear mushroom sticks biochar) pyrolysis temperature. According to the Langmuir model, the maximum adsorption capacity of Cd2+ and Pb2+increased with higher pyrolysis temperature, being 29.84, 39.08, 46.16 mg·g−1and 124.3, 186.8, 234.2 mg·g−1, respectively for three different pyrolysis temperatures 250, 450, and 650 °C. WMBC exhibited a stronger adsorption ability for Pb2+ than for Cd2+. Competition between the two heavy metals severely inhibited the adsorption of Cd2+. Based on X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and Fourier transform infrared spectroscopy (FTIR) analyses, the dominant interaction mechanisms were determined to be complexation, ion exchange, precipitation, and C–π interaction. The results suggest WMBC shows promise as a novel, cheap, and effective adsorbent that can be used to remove both Cd2+ and Pb2+ pollutants from environmental media.

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