24年10月30日文献情报（16篇）

24年10月30日文献情报

1. 题目: Effects of soil acidification on humus, electric charge, and bacterial community diversity

文章编号: N24103016
期刊: Environmental Monitoring and Assessment
作者: Chang Liu, Xiaoxuan Shang, Jihong Wang, Shengchen Zhao
更新时间: 2024-10-30
摘要:

Soil acidification due to the long-term application of nitrogenous fertilizers and the consequent impact on crop growth have been frequently reported. The effects of acidification on soil humus, charge, and microbial communities need to be studied. In this experiment, fertilizer drenching was used to simulate the effects of multiple years of fertilizer application on the black soil. The results showed that 25 years of soil acidification treatment resulted in a decrease of 8.97% in the content of stable humus and led to a decrease of 58% and 51.18% in the humic acid (HA) content and degree of humification (PQ) value in stable humus, respectively. In addition, soil acidification leads to a significant decrease in total negative charge (CEC_8.2) and variable negative charge (CECv), with both decreasing by 63.28% and 88.67%, respectively, at 25 years. Acidification treatments affected both soil microbial community abundance and diversity, with a significant decrease in Acidobacteriota and Gemmatimonadota abundance and an increase in Bacteroidia abundance and Acidobacteriota abundance at 25 years.

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2. 题目: Heterogeneous precipitation behavior and mechanism during the adsorption of cationic heavy metals by biochar: Roles of inorganic components

文章编号: N24103015
期刊: Journal of Hazardous Materials
作者: Rui Han, Yuan Gao, Yongfeng Jia, Shaofeng Wang
更新时间: 2024-10-30
摘要: Heavy metals are commonly adsorbed by biochar in contaminated water and soil. However, the behaviour and underlying mechanisms of heterogeneous precipitation between the inorganic components of biochar and cationic heavy metals remain poorly understood. In this study, we comprehensively investigated the nucleation, growth, and aggregation of precipitates, ion exchange-coupled precipitation behaviour, adsorption-precipitation correlation, and the influence of environmental factors (e.g., anion content, pH, initial concentration, type of heavy metals, and biochar size). The kinetic results indicated that the generation of precipitates was accompanied by an adsorption reaction with a gradual increase in crystal size and aggregation behaviour. Moreover, precipitation includes both surface and solution precipitation. The increasing local concentration of Pb(II) around the biochar at high initial concentrations increased the supersaturation of the nucleating substance, which decreased the potential for heterogeneous nucleation and facilitated heterogeneous precipitation. Correlation analysis revealed the presence of a coupling mechanism between precipitation and cation exchange. The enhanced electrostatic attraction at high pH could lower the heterogeneous nucleation potential barrier, thus promoting heterogeneous precipitation. The small biochar size extended the induction time, which was unfavourable for heterogeneous nucleation. This study provides a deeper understanding of the heterogeneous precipitation behaviour of the inorganic components of biochar and cationic heavy metals.
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3. 题目: Redistribution of phosphorus fraction driven by organic carbon and microbial community during composting.

文章编号: N24103014
期刊: Journal of Environmental Management
作者: Lei Cheng, Hu Cui, Yang Ou, Lixia Wang, Meiwen Bao
更新时间: 2024-10-30
摘要: Available information on the coupling relationship between phosphorus fraction and organic carbon during composting remains limited. Thus, this research investigated the changes of phosphorus fraction, dissolved organic carbon fluorescent components and microbial community in swine manure composting with different carbon sources including the maize straw (MS), garden waste (GW) and distillers' grains (DG), in order to investigate whether the distribution and availability of phosphorus are influenced by different carbon sources used in the composting of swine manure. The result showed that different carbon sources changed phosphorus availability variously mainly by altering the succession of fungal communities and phosphorus functional genes. The dissolved organic material including tyrosine and tryptophan facilitate the mineralization of organic phosphorus (Org-P) into water-soluble phosphorus, thereby improving phosphorus availability. However, humic acid-like carbon components promote the conversion of inorganic-phosphorus to Org-P, which is the direct cause of the reduced phosphorus availability during composting. The results of this study provide support for the development of phosphorus-rich, stable, and clean compost products.
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4. 题目: Impact of phenolic-formaldehyde resin microplastics on anaerobic granular sludge: EPS interaction mechanisms and impacts on reactor performance

文章编号: N24103013
期刊: Journal of Hazardous Materials
作者: Keyang Jiang, Qian Gao, Jinhu Feng, Sijia Zhu, Wenxia Zhai, Di Wu, Huiya Zhang, Wei Zhang, Xi Liu, Jian Zhang, Shuangfei Wang, Zhiwei Wang
更新时间: 2024-10-30
摘要: This paper investigates the effects of phenolic-formaldehyde resin microplastics (PF-MPs) with different particle sizes on anaerobic granular sludge (AnGS) and reveals the complex interaction mechanisms between extracellular polymeric substances (EPS) and PF-MPs through the combination of molecular dynamics simulations and spectroscopy. PF-MPs provide a new ecological niche for microorganisms. Microorganisms and EPS can adhere and accumulate on the surface of PF-MPs, producing highly active floc sludge inside the reactor, thereby increasing the chemical oxygen demand (COD) removal rate and methane production of the reactor. However, the high metabolic activity of floc sludge consumes the biodegradable components in EPS, resulting in loose rupture of the sludge particles and reduced particle size. In addition, small particle size S-PF can adhere to the sludge surface，which caused mass transfer barriers and reduced the expression of genes and enzyme activities for the sludge acidification process and the main methanogenic processes. Insufficient internal nutrients lead to endogenous metabolism within the granules, causing internal hollowing, which affects the density and settling performance of the sludge. Monolayer physical adsorption plays a major role in the adsorption of EPS on PF-MPs. 2D-COS and FTIR spectroscopy were used to elucidate the preferential binding of polysaccharides to PF-MPs. This paper explores the fate of PF-MPs in anaerobic systems and demonstrates the important role of EPS in the capture of microplastics by granular sludge, providing a theoretical basis for understanding the migration of microplastics in wastewater treatment.
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5. 题目: Integrating biochar granular with microbial fuel cell to enhance the remediation of polycyclic aromatic hydrocarbons contaminated soil

文章编号: N24103012
期刊: Chemical Engineering Journal
作者: Chen Yan, Dandan Liang, Dahong Chen, Yanling Yu, Zhaohan Zhang, Jiajie Zhou, Yujie Feng
更新时间: 2024-10-30
摘要: The remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil has attracted global attention. Soil microbial fuel cells (SMFC) can induce inherent electric fields to enhance pollutant removal, thereby shedding light on the remediation of PAHs contaminated soil. However, the remediation efficiency is hindered by the high internal resistance within the soil environment. This study proposed the integration of biochar granular (BCG) with SMFC to mitigate internal resistance and enhance PAHs removal efficiencies. The results illustrated that compared to SMFC, 2 % BCG-SMFC increased the removal efficiencies of phenanthrene (PHE) and pyrene (PYR) to 67.4 ± 1.5 % and 58.6 ± 1.9 %. The accompanying power density reached 44.1 mW m⁻², and this was 4.0-fold that of SMFC (11.0 mW m⁻²). Additional investigations demonstrated that adding BCG increased soil porosity and permeability. The porosity rose from 40.7 ± 3.8 % (raw soil) to 48.2 ± 0.5 % (1 % BCG soil) and 52.0 ± 0.3 % (2 % BCG soil), while permeability coefficients for 1 % BCG and 2 % BCG soils were approximately 1.27- and 1.38-fold that of raw soil (0.26 ± 0.01 mm/min). Thus, the ohmic resistance (R_ohm), charge transfer resistance (R_ct), and diffusion resistance (R_d) of the SMFCs with BCG (BCG-SMFCs) were significantly reduced, and this was beneficial for the power output and PAHs removal. Through the analysis of microbial communities, adding BCG increased the enrichment of PAHs-degrading bacteria such as Pseudomonas sp., Lysobacter sp., Chitinophaga sp., Ralstonia sp., and Phenylobacterium sp. in BCG-SMFCs. Enzymes responsible for PAHs degradation were also highly expressed in BCG-SMFCs. This study suggested a novel approach for enhancing soil porosity and permeability by introducing BCG into SMFC, thereby improving the in situ bioremediation efficiency of PAHs contaminated soil.
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6. 题目: Metal-modified biochars prepared from blue algae and their ability of adsorbing phosphates from water and utilization as soil amendment

文章编号: N24103011
期刊: Journal of Environmental Chemical Engineering
作者: Huangbo Chen, Xinqing Zhang, Yuxin Xiao, Shaogui Yang, Shiyin Li, Jijie Kong, Cheng Sun, Huan He
更新时间: 2024-10-30
摘要: The problem of blue algae accumulation can be alleviated by utilizing blue algae as biomass for resource utilization, which can remove excess phosphates from water to alleviate eutrophication. Herein, Magnesium (Mg) and/or lanthanum (La) were used to modify biochar via high-temperature slow pyrolysis with blue algae as the raw biomass. These modified biochars exhibited abundant carbon (18.0%-50.3%), oxygen content (17.4%-49.1%), along with a high specific surface area (82.26-233.80 m²/g). The surface of metal-modified biochar was enriched with hydroxyl and carboxyl groups and metal elements were efficiently incorporated into biochars. Adsorption kinetic and isotherm experiments were conducted under the optimal pyrolysis temperature of 600 °C, pH of 6.0, and adsorbent dosage of 2.0 g/L. The adsorption kinetics studies by metal-modified biochars for phosphate fitted well pseudo-second-order model Redlich-Peterson isotherm model. Biochar modified by Mg and La exhibited the highest removal efficiency (97.8%) for phosphate at adsorption equilibrium. The adsorption mechanism involved the electrostatic interaction between hydroxylated metal oxides and negatively charged phosphate ions and the precipitation of phosphate ions through chemical reactions with metal oxides in the solution. After phosphate adsorption, the pristine and metal-modified biochars derived from blue algae were applied as the soil amendment. Biochar adsorbed phosphate apparently improved the germination rate of seeds facilitated the height, width, weight, and chlorophyll content of vegetable seedlings, and induced oxidative stress, which proved that the biochar recovered after adsorption was a high-quality soil amendment. This study provides a new approach for the treatment of phosphate wastewater and the algae application.
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7. 题目: Investigation of the formation and variability of dissolved inorganic carbon and dissolved organic carbon in the water of a small river (on the example of the Styr River, Ukraine)

文章编号: N24103010
期刊: Environmental Monitoring and Assessment
作者: Olha Biedunkova, Pavlo Kuznietsov
更新时间: 2024-10-30
摘要:

This paper presents the results of a study on the dynamics in the concentrations of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) in water samples collected from the Styr River between 2019 and 2022. The concentrations of DIC and DOC were measured using an Elementar liqui TOC II analyzer. The study methodology involved analyzing the changes in DIC and DOC concentrations and their relationship with flow rates, temperature, seasonality, and other indicators such as hydrogen pH levels, total alkalinity (TA), and total dissolved solids (TDS). The purpose of this article is to identify patterns in the formation and changes of DIC and DOC concentrations in the Styr River. The concentrations of DIC and DOC in the samples ranged from 1.55 to 4.93 mM and 0.49 to 1.43 mM, respectively, with DOC accounting for an average of 22% of the total dissolved carbon content. The highest DOC concentrations were observed in summer, while the highest DIC concentrations were observed in winter. Based on the results, it can be concluded that water flow and temperature have an impact on DOC concentration, while flow, temperature, and pH affect DIC concentration. There was no correlation between DIC and DOC concentrations, but a strong positive relationship (r = 0.9056, p < 0.001) was found between DIC and TA concentrations. Therefore, the main factors influencing DIC in the Styr River are those that affect the carbonate equilibrium, such as leaching of carbonate and silicate rocks, CO₂ absorption from the atmosphere, and changes in pH. Additionally, the concentration of DOC is influenced by biological activity and is higher during the warm season. These findings can be used to develop a strategy for managing water resources in the Styr River basin and to assess and predict the ecological state of the river.

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8. 题目: Rapid Generation of Microplastics and Plastic-Derived Dissolved Organic Matter from Food Packaging Films under Simulated Aging Conditions

文章编号: N24103009
期刊: Environmental Science & Technology
作者: Liuwei Wang, Jing Gao, Wei-Min Wu, Jian Luo, Michael S Bank, Albert A Koelmans, John J Boland, Deyi Hou
更新时间: 2024-10-30
摘要: In this study, we show that low-density polyethylene films, a prevalent choice for food packaging in everyday life, generated high numbers of microplastics (MPs) and hundreds to thousands of plastic-derived dissolved organic matter (DOM) substances under simulated food preparation and storage conditions. Specifically, the plastic film generated 66–2034 MPs/cm² (size range 10–5000 μm) under simulated aging conditions involving microwave irradiation, heating, steaming, UV irradiation, refrigeration, freezing, and freeze–thaw cycling alongside contact with water, which were 15–453 times that of the control (plastic film immersed in water without aging). We also noticed a substantial release of plastic-derived DOM. Using ultrahigh-resolution mass spectrometry, we identified 321–1414 analytes with molecular weights ranging from 200 to 800 Da, representing plastic-derived DOM containing C, H, and O. The DOM substances included both degradation products of polyethylene (including oxidized forms of oligomers) and toxic plastic additives. Interestingly, although no apparent oxidation was observed for the plastic film under aging conditions, plastic-derived DOM was more oxidized (average O/C increased by 27–46%) following aging with a higher state of carbon saturation and higher polarity. These findings highlight the future need to assess risks associated with MP and DOM release from plastic wraps.
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9. 题目: Combining biochar with schwertmannite-based solid to enhance co-removal of ciprofloxacin and roxarsone as well as to improve regenerative capacity

文章编号: N24103008
期刊: Chemical Engineering Journal
作者: Ting Li, Xin Du, Xiqing Wang, Yujun Zhou, Jiansheng Li, Murong Wang, Lixiang Zhou
更新时间: 2024-10-30
摘要: The widespread use of antibiotics and roxarsone (ROX) in the livestock industry poses significant challenges for their safe and efficient disposal. Schwertmannite (Sch) has been recognized as a promising environmental material for the removal of ROX due to its dual functionality in both heterogeneous Fenton reaction and arsenic adsorption. However, Sch as a typical Fe-based material generally exhibits a low adsorption capacity for antibiotics. Herein, a biochar (BC) loaded Sch-based material was developed to enhance the co-adsorption capacity for ciprofloxacin (CIP) and ROX, while enabling adsorbent regeneration via heterogeneous Fenton reaction. Under the conditions of 0.6 g/L adsorbent, 80–200 mg/L pollutants (CIP and ROX), and pH 6, the maximum adsorption capacities of Sch/Fe₃O₄/BC for CIP (66.9 mg/g) and ROX (220.9 mg/g) were obviously higher than that of other Fe-based adsorbents. Sch/Fe₃O₄/BC demonstrated regeneration efficiencies of ∼80 % for CIP and ∼60 % for ROX after seven cycles of experimentation. The adsorption mechanisms were elucidated as synergistic interactions involving pore-filling interaction, π-π electron donor–acceptor interaction, H-bonding, As-Fe coordination, and electrostatic attraction. Additionally, oxidation also contributed to the co-removal of CIP (∼27 %) and ROX (∼24 %) during the adsorption process. This study not only addresses the safe disposal of CIP and ROX but also introduces an innovative approach for the treatment of multi-pollutant contamination in water systems.
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10. 题目: Understanding the ionic hydrogel-forming property of extracellular polymeric substances: differences in lipopolysaccharides between flocculent and granular sludge

文章编号: N24103007
期刊: Water Research
作者: Ji Li, Xiaodi Hao, Mark C M van Loosdrecht, Yuemei Lin
更新时间: 2024-10-30
摘要: An interesting and potential property of extracellular polymeric substances (EPS) is the hydrogel formation with calcium ions. Aiming at understanding the significant difference in the hydrogel formed between EPS from flocculent and granular sludge, a targeted investigation of the lipopolysaccharides (LPS), one of the important EPS components, was performed. LPS was isolated from the EPS of flocculent and granular sludge, and both the glycan and the lipid A parts of LPS were characterized and compared. The morphology of LPS-calcium (LPS-Ca) aggregates were visualized by the polymyxin B-based fluorescent probe. The LPS constituted about 25% and 15% of the EPS from flocculent and granular sludge, respectively. The flocculent sludge LPS showed a lower amount of glycans, shorter glycan chain length, lower molecular weight, and higher possibility of containing unsaturated lipids than the granular sludge EPS. The flocculent sludge LPS-Ca aggregates demonstrated invert structures with the water phase in between, contributing to the fluid-like property of the respect EPS-Ca. In contrast, with the remarkably different chemical structure, LPS-Ca aggregates from granular sludge displayed bilaminar multilayered morphology, contributing to the solid, self-standing hydrogel of EPS-Ca.
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11. 题目: Exploring the traits and possible ecological risks of heavy metals in biochars derived from rice husk and sugar beet pulp

文章编号: N24103006
期刊: Environmental Monitoring and Assessment
作者: Farzad Moradi-Choghamarani, Farshid Ghorbani
更新时间: 2024-10-30
摘要:

This research investigated the properties and potential environmental hazards associated with biochars derived from rice husk (RH) and sugar beet pulp (SBP), both of which are rich in heavy metals (HMs). The results indicated that the concentration of various HM fractions is significantly affected by the type of feedstock and the pyrolysis temperature. Specifically, the total concentrations of HMs in biochars produced at 600 °C were found to be 10–140% higher than those in the original biomasses, a phenomenon attributed to the precipitation of HMs. Cd was a notable exception, exhibiting a reduction of 3–7% in the resultant biochars when compared to biomass, likely attributable to its volatilization. The results also revealed that the F1 + F2 fraction of HMs were largely transformed into F3 + F4 fraction during combustion, indicating that pyrolysis may reduce the ecotoxicity of HMs present in contaminated biomass. However, the process did not effectively diminish the F1 and F2 fractions of Cr and Cd. Elevated pyrolysis temperature significantly enhanced the reduction of HMs phytoavailability. Specifically, the phytoavailability of HMs in biochars produced at 600 °C exhibited a decrease ranging from 10 to 92% when compared to the original biomass. Conversely, an unexpected rise in the phytoavailable fractions of Cr and Cd was noted in both RH and SBP biochars as the pyrolytic temperature increased, which correspondingly raised the potential ecological risk index (PERI). All materials analyzed exhibited a very high risk level, with PERI values exceeding 800, primarily due to the significant toxicity of Cd. Excluding Cd from consideration, the biomasses and their resultant biochars displayed PERI values ranging from 7 to 13. It is important to acknowledge that pyrolysis may not effectively diminish the environmental toxicity associated with HMs present in contaminated biomass, thereby limiting its safe application.

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12. 题目: The autotoxicity of dissolved organic matter from Microcystis may be a contributor to the decline of its bloom

文章编号: N24103005
期刊: Water Research
作者: Jun Sha, Lirong Song, Chao Liu, Fang Bai, Haiyang Zhang, Zichao Gong, Tianli Li, Jin Liu, Guangbin Gao, Yunlu Jia
更新时间: 2024-10-30
摘要: Microcystis blooms frequently occur in freshwaters worldwide, causing detrimental impacts on the ecosystems and human health. Studying the mechanisms behind the decline of Microcystis blooms can aid in mitigating their harmful effects. However, there is currently a dearth of research in this area. In this study, we examined the dissolved organic matter (DOM) collected during the growth of axenic Microcystis. Axenic Microcystis produces toxic DOM during its growth, which accumulate in the medium. Further, the DOM obtained from decline phase of Microcystis blooms exhibited a strong inhibitory effect on the growth of fresh Microcystis cultures. It is postulated that DOM may contribute to decline of Microcystis blooms. Meanwhile, potential autotoxic components in Microcystis DOM were analyzed by integrating column chromatography fractionation, identification and Microcystis growth inhibition assay. The results showed that the autotoxic components consisted mainly of small molecule hydrophobic base. Moreover, we evaluated the influence of key environmental factors such as nutrient and temperature on the autotoxic DOM in Microcystis cultures. Nutrient deficiency and low temperature may promote the accumulation of autotoxic substances. The study provided a new perspective on the decay process of cyanobacterial bloom, and offered new ideas for the development of natural algicidal agents.
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13. 题目: Seawater boosts oxytetracycline (OTC) residues in struvite via hydroxyapatite (HAP) and dissolved organic matter (DOM) co-precipitation

文章编号: N24103004
期刊: Journal of Hazardous Materials
作者: Degui Gao, Yuefei Huang, Shungui Zhou, Bing Li, Guangqian Wang
更新时间: 2024-10-30
摘要: Seawater, as an alternative magnesium (Mg) source, has the potential to improve the overall economic and environmental footprint of struvite production compared to the use of pure Mg salts. However, the presence of other ions in seawater may affect the migration of tetracyclines (TCs), commonly found in wastewater, potentially reducing the quality of the recovered product, and posing environmental risks. But these effect has not been illustrated before. This study investigated the impact of seawater on oxytetracycline (OTC) migration during struvite recovery from swine wastewater. Under varying pH levels and Mg/P molar ratios, the OTC content in recovered struvite was ranged from 19 to 103 μg/g, which was 6 to 43 μg/g when using MgCl₂ as Mg source. The key factor influencing OTC content was identified as Ca²⁺ in seawater. The co-precipitation of hydroxyapatite (HAP) and the incorporation of dissolved organic matter (DOM) were the primary reasons for increased OTC content. Interactions between Ca²⁺ on HAP surfaces and the carbonyl oxygen of OTC, along with ternary complex formations involving Ca²⁺, DOM, and OTC, facilitated OTC migration through adsorption onto struvite. Notably, increasing the Mg/P molar ratio reduced OTC enrichment due to the competition between Ca²⁺ and Mg²⁺. Density functional theory (DFT) calculations supported these interfacial interactions. These findings enhanced the understanding of antibiotic migration during phosphorus (P) recovery using seawater as alternative Mg source and suggested solutions for reducing P recovery contamination in the future.
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14. 题目: Reviews and syntheses: Opportunities for robust use of peak intensities from high-resolution mass spectrometry in organic matter studies

文章编号: N24103003
期刊: Biogeosciences
作者: William Kew, Allison Myers-Pigg, Christine H Chang, Sean M Colby, Josie Eder, Malak M Tfaily, Jeffrey Hawkes, Rosalie K Chu, James C Stegen
更新时间: 2024-10-30
摘要: . Earth's biogeochemical cycles are intimately tied to the biotic and abiotic processing of organic matter (OM). Spatial and temporal variations in OM chemistry are often studied using direct infusion, high-resolution Fourier transform mass spectrometry (FTMS). An increasingly common approach is to use ecological metrics (e.g., within-sample diversity) to summarize high-dimensional FTMS data, notably Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). However, problems can arise when FTMS peak-intensity data are used in a way that is analogous to abundances in ecological analyses (e.g., species abundance distributions). Using peak-intensity data in this way requires the assumption that intensities act as direct proxies for concentrations. Here, we show that comparisons of the same peak across samples (within-peak) may carry information regarding variations in relative concentration, but comparing different peaks (between-peak) within or between samples does not. We further developed a simulation model to study the quantitative implications of using peak intensities to compute ecological metrics (e.g., intensity-weighted mean properties and diversity) that rely on information about both within-peak and between-peak shifts in relative abundance. We found that, despite analytical limitations in linking concentration to intensity, ecological metrics often perform well in terms of providing robust qualitative inferences and sometimes quantitatively accurate estimates of diversity and mean molecular characteristics. We conclude with recommendations for the robust use of peak intensities for natural organic matter studies. A primary recommendation is the use and extension of the simulation model to provide objective guidance on the degree to which conceptual and quantitative inferences can be made for a given analysis of a given dataset. Broad use of this approach can help ensure rigorous scientific outcomes from the use of FTMS peak intensities in environmental applications.
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15. 题目: Calcium regulates nitrogen removal in constructed wetlands: The interactions between dissolved organic matter and microbial response

文章编号: N24103002
期刊: Chemical Engineering Journal
作者: Dongdong Yao, Huijun Xie, Yunkai Li, Shiwen Zhang, Na Dai, Zhen Hu, Haiming Wu, Shuang Liang, Jian Zhang
更新时间: 2024-10-30
摘要: Limited carbon bioavailability in low C/N tailwater aggravated the difficulty of nitrogen (N) removal. Calcium (Ca) can regulate carbon transformation, but the effects of Ca on N removal in constructed wetlands (CWs) remain elusive. To fill the gap, this study constructed two types of Ca-based CWs, and the results revealed that the removal efficiencies of nitrate (NO₃⁻-N) and total nitrogen (TN) in Ca-based CWs increased by 9.83–22.25 % and 8.59–18.72 %, respectively, compared to control group. The proportion of protein-like DOM and P/H index (represent bioavailability of DOC) increased in Ca-based CWs, supporting the growth of heterotrophic denitrifiers and facilitated NO₃⁻-N and TN removal. In addition to directly enhancing complete denitrification, Ca-based CWs also optimize the N removal pathway. Moreover, Ca enhanced complexity and robust of the microbial network, increased microbial communication, thereby jointly facilitating N removal. This study highlighted Ca improved N removal by collaborating the interactions of DOM transformation and microbial activity, which provided an abundant and cheap substrate for the treatment of low C/N wastewater by CWs
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16. 题目: Enhanced removal of biolabile oxygen-depleted dissolved organic matter by coagulation-adsorption process Improves biological stability of reclaimed water

文章编号: N24103001
期刊: Chemical Engineering Journal
作者: Hang He, Niannian Sun, Lanfeng Li, Hao Zhou, Xiaoyin Yang, Jing Ai, Xiaofang Yang, Chengzhi Hu, Dongsheng Wang, Weijun Zhang
更新时间: 2024-10-30
摘要: Ensuring biological stability, signifying the maintenance of an unchanged bacterial concentration and composition during water distribution, is essential for mitigating the microbial hazards of reclaimed water. However, the interplay between chlorine-resistant bacteria (CRB) regrowth and molecular transformation of biodegradable organic matter in chlorinated reclaimed water distribution system remain unclear. This work investigated the transformation of dissolved organic matter (DOM) in reclaimed water treated by coagulation and by coagulation-adsorption over a 20-day incubation following chlorination, as well as its interactions with CRB through high-resolution mass spectrometer and high-throughput sequencing. The DOM biotransformation profile and DOM-bacteria interaction network collectively revealed the overall substrate preference and metabolic pattern of CRB (e.g., Methylobacterium-Methylorubrum, Acidovorax, and Sphingomonas), which evinced a propensity for utilizing oxygen-depleted DOM (O/C < 0.5) and producing oxygen-enriched DOM (O/C > 0.4). The incorporation of powdered activated carbon during coagulation markedly decreased the level of biodegradable DOM (4.33 mg C/L) and subsequently retarded the regrowth of CRB by one day compared to coagulation alone, attributable to the selective adsorption of DOM molecules with low O/C onto the activated carbon. This work underscores the critical role of the enhanced removal of oxygen-depleted DOM in ameliorating the biological stability of waters.
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