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81. 题目: Impact of natural organic matter and inorganic ions on the stabilization of polystyrene micro-particles
文章编号: N24041505
期刊: Science of the Total Environment
作者: Lars Eitzen, Aki Sebastian Ruhl, Martin Jekel
更新时间: 2024-04-15
摘要: The orthokinetic coagulation of irregularly shaped polystyrene micro-particles (PS-MP) was investigated in solutions of inorganic cations with different valence (NaCl, CaCl, LaCl) using a coagulation jar test set-up combined with light extinction particle counting. The stabilizing effect of model natural organic matter (NOM from reverse-osmosis (RO-NOM), humic (HA) & fulvic acid (FA)) and of surface water components (SW-NOM) was studied. Collision efficiencies were calculated from the decrease in particle concentration applying first order reaction kinetics. The coagulation of PS-MP followed Derjaguin-Landau-Verwey-Overbeek (DLVO) theory with regard to ionic charge in solution. Highest collision efficiencies were obtained close to the suspected critical coagulation concentrations for CaCl (12 mM) and LaCl (5.5 mM) whereas for NaCl no CCC was found within the applied concentration range (10–1000 mM). The addition of NOM effectively stabilized PS-MP at low ionic strength (10 mM NaCl) in the order HA > RO-NOM > FA > SW-NOM at concentrations of dissolved organic carbon (DOC) as low as 0.2–0.5 mg/L DOC through electrostatic repulsion. PS-MP were effectively stabilized in 6.1 mg DOC/L of SW-NOM even at high ionic strength (100 mM MgCl). Coagulation at intermediate ionic strength (10 mM MgCl) was only observed for SW-NOM concentrations below 0.6 mg/L DOC. The results showed that even low NOM concentrations prevent PS-MP from orthokinetic coagulation in the presence of high ion concentrations. The study provides further insight in the orthokinetic coagulation behavior of PS-MP in the presence of NOM and highlights the importance of NOM for the stabilization of microplastics in aquatic suspensions. Further research is needed to elucidate the behavior of MP in turbulent systems to predict the mobility MP in aquatic systems such as rivers.

82. 题目: Characteristics of DOM and bacterial community in rural black and odorous water bodies under different dimensions
文章编号: N24041504
期刊: Science of the Total Environment
作者: Siyu Hu, Guangqing Song, Jie Gao, Yuanyuan Wang, Qinyu Yang, Ruoqi Qiu, Song Li, Zuoping Zhao
更新时间: 2024-04-15
摘要: Analysis of dissolved organic matter (DOM) composition and microbial characteristics is crucial for tracing the sources of rural black and odorous water bodies (BOWB). The aim of this study was to explore the DOM and microbial diversity and identify the primary environmental factors in BOWB from various pollution sources during different periods using EEMs-PARAFAC and Illumina sequencing. It was found that the physicochemical properties vary widely across different pollution types of BOWB, with higher overall content during the high-water period compared to the normal-water period. The types of dissolved organic matter in BOWB are Tyrosine proteins, Fulvic acid, Dissolved microbial metabolites, and Humic acid. During the normal-water period, DOM originates primarily from terrestrial sources in various water bodies. However, DOM affected by livestock and poultry waste and industrial effluents is influenced by both internal and external sources during periods of high water levels. In industrial waste-type BOWB, the biological sources of water are weak. were the dominant bacterial phyla. According to the redundancy analysis, pH ( = 0.047), Total nitrogen (TN) ( = 0.045), Organic carbon (OC) ( = 0.044), and Nickel (Ni) ( = 0.047) are the primary environmental factors influencing the composition of bacterial communities.

83. 题目: Optimizing grazing exclusion duration for carbon sequestration in grasslands: Incorporating temporal heterogeneity of aboveground biomass and soil organic carbon
文章编号: N24041503
期刊: Science of the Total Environment
作者: Lingfan Wan, Guohua Liu, Jian Sun, Jiaxin Ma, Hao Cheng, Yu Shen, Chenjun Du, Xukun Su
更新时间: 2024-04-15
摘要: Grasslands account for approximately one-third of the global terrestrial carbon stocks. However, a limited understanding of the impact of grazing exclusion on carbon storage in grassland ecosystems hinders progress towards restoring overgrazed grasslands and promoting carbon sequestration. In this study, we conducted a comprehensive meta-analysis to investigate the effects of grazing exclusion on aboveground biomass (AGB) and soil organic carbon (SOC) in four grasslands: alpine grasslands (AP), tropical savannas (TS), temperate subhumid grasslands (TG), and a semi-desert steppe (SD). Our meta-analysis indicated that grazing exclusion significantly enhanced carbon sequestration in grassland ecosystems, and the benefits of carbon sequestration were most pronounced in the AP, followed by the TG, SD, and TS. Grazing exclusion duration (DUR) was a significant factor associated with the response of aboveground biomass (AGB) and soil organic carbon (SOC) to grazing exclusion. Moreover, the relationships between AGB and DUR were nonlinear, with existence thresholds of 18, 21, 12, 19, and 23 years in global grasslands (ALL), AP, TS, TG, and SD, respectively. However, the relationship between SOC and DUR was linear, with SOC continuing to increase as DUR increased (up to 40 years). The multi-objective optimization indicated that the optimal duration of grazing exclusion for grassland carbon sequestration was 18–20, 21–23, 12–14, 19–21, and 23–25 years for ALL, AP, TS, TG, and SD, respectively. Our study contributes to the enhancement of grazing management and offers better options for increasing carbon sequestration in grasslands.

84. 题目: Efficient acetaminophen degradation via peroxymonosulfate activation by Mn/N co-doped biochar: Performance, mechanism and approach
文章编号: N24041502
期刊: Journal of Environmental Chemical Engineering
作者: Mengqing Sun, Wei Fang, Qianwei Liang, Yujia Xing, Lin Lin, Hanjin Luo
更新时间: 2024-04-15
摘要: Advanced oxidation processes (AOPs) are frequently used to remove stubborn pollutants from the aquatic environment, and developing an eco-friendly and high-performance catalyst is an effective strategy to enhance the efficiency of AOPs. In this study, Mn nanoparticle-loaded nitrogen-doped kelp biochar catalysts were synthesized at varying temperatures to activate peroxymonosulfate (PMS) and degrade acetaminophen (ACT). The findings show that the Mn@NBC-800/PMS system can fully remove ACT (20 mg/L) in 10 min under ideal circumstances. Electrochemical tests, electron paramagnetic resonance (EPR) analysis and quenching experiments reveal that the primary mechanism of ACT degradation was a non-radical pathway dominated by electron transfer and singlet oxygen (O). In addition, mechanism studies indicate that Mn species, C═O groups and graphite N were possible active sites. The Mn@NBC-800/PMS system demonstrates excellent catalytic activity across various pH values, inorganic anions, and water conditions, making it highly suitable for practical applications. This study emphasizes the significant potential of Mn/N co-doped biochar and provides invaluable insights for designing efficient carbon-based catalysts for wastewater treatment.

85. 题目: Quantifying the mitigating effect of organic matter on heavy metal availability in soils with different manure applications: A geochemical modelling study
文章编号: N24041501
期刊: Ecotoxicology and Environmental Safety
作者: Jing Li, Yan Xu, Yitao Zhang, Zhen Liu, Huarui Gong, Wen Fang, Zhu OUYang, Weiwei Li, Li Xu
更新时间: 2024-04-15
摘要: Manure is one of the main sources of heavy metal (HM) pollution on farmlands. It has become the focus of global ecological research because of its potential threat to human health and the sustainability of food systems. Soil pH and organic matter are improved by manure and play pivotal roles in determining soil HM behavior. Geochemical modeling has been widely used to assess and predict the behavior of soil HMs; however, there remains a research gap in manure applications. In this study, a geochemical model (LeachXS) coupled with a pH-dependent leaching test with continuously simulations over a broad pH range was used to determine the effects and pollution risks of pig or cattle manure separate application on soil HMs distribution. Both pig and cattle manure applications led to soil pH reduction in alkaline soils and increased organic matter content. Pig manure application resulted in a potential 90.5–156.0 % increase in soil HM content. Cattle manure did not cause significant HM contamination. The leaching trend of soil HMs across treatments exhibited a V-shaped change, with the lowest concentration at pH = 7, gradually increasing toward strong acids and bases. The dissolved organic matter-bound HM content directly increased the HM availability, especially for Cu (up to 8.4 %) after pig manure application. However, more HMs (Cr, Cu, Zn, Ni) were in the particulate organic matter-bound state than in other solid phases (e.g., Fe-Al(hydr) oxides, clay minerals), which inhibited the HMs leaching by more than 19.3 % after cattle manure application. Despite these variations, high HM concentrations introduced by pig manure raised the soil contamination risk, potentially exceeding 40 times at pH ±1. When manure is returned to the field, reducing its HM content and mitigating possible pollution is necessary to realize the healthy and sustainable development of circular agriculture.

86. 题目: Spatial variation of soil organic carbon under major rubber planting regions in China
文章编号: N24041409
期刊: Land Degradation & Development
作者: Xinwei Guo, Linlin Zhao, Zhixiang Wu, Rui Sun, Chuan Yang, Qingmao Fu, Zhenghong Tan
更新时间: 2024-04-14
摘要: Understanding the dynamic relationships between soil organic carbon (SOC) and stand age are essential to quantify and predict the terrestrial carbon sequestration potential. However, the spatial patterns in the response of rubber plantation SOC to stand age and their driving factors remain unclear. Based on SOC and its components measurement at different soil depths (0–40 cm) in rubber plantations under five different age classes (0–5, 5–10, 10–20, 20–30, and >30 years) in three major rubber cultivation regions in China, distribution pattern and controlling factors of SOC were investigated. We found that SOC and its components showed significant spatial variability vertically with soil depth and laterally across sampling sites. SOC contents in three major rubber cultivation regions range from 4.48 to 20.13 g kg−1 at a depth of 0–40 cm. Among the sampling sites, Jinghong had the highest SOC content at a depth of 0–10 cm (20.13 g kg−1). On a large‐scale, the relationship between SOC and stand age in rubber plantations did not show a consistent pattern among different sampling sites. Additionally, annual rainfall, soil moisture content, and soil pH had a stronger impact on SOC in rubber plantations compared to stand age. The results indicated that the spatial variability of SOC in rubber plantations with stand age could be influenced by specific soil properties and climate‐related variables at each sampling site. This study emphasized the significance of conducting multi‐site, multi‐scale studies to enhance our understanding of SOC dynamics and its influencing factors, and help to more accurately predict the dynamic changes of soil carbon storage in rubber plantations.

87. 题目: Microbial dynamics during in-situ organic matter decomposition reveals the importance of keystone taxa in the core microbiome
文章编号: N24041408
期刊: Applied Soil Ecology
作者: Debarshi Dasgupta, Alan E Richardson, Lennel A Camuy-Vélez, Clive Kirkby, John A Kirkegaard, Samiran Banerjee
更新时间: 2024-04-14
摘要: Land-use intensification causes a gradual loss of carbon from soils, jeopardizing ecosystem services and functions. Supplementing carbon-rich crop residues with inorganic nutrients, to stoichiometrically favor microbial-mediated humification, aims to re-build the lost carbon. However, we have limited knowledge of how microbial communities and key players change during organic matter (OM) decomposition, when the limitation of inorganic nutrients for decomposition is eliminated. This study was conducted in two long-term field trials (>26-years old) in New South Wales, Australia, where the decomposition dynamics of C and N-labeled wheat stubble were assessed using four treatments: , , , and . The microcosms were sampled over three timepoints spanning the crop growth period. We performed 16S rRNA and ITS amplicon sequencing of 94 samples to identify microbial taxonomic and functional groups associated with OM dynamics. Our results show that the addition of straw markedly increased microbial biomass carbon and fungal:bacterial ratio. Treatments significantly differed in structuring the microbial communities, with a stronger effect on bacteria than fungi. KEGG-predicted bacterial functional pathways (e.g., bacterial genes for S-adenosyl-L-methionine cycling) and fungal lifestyle traits (e.g., saprotrophic fungi) differed significantly between the treatments. Straw and nutrient amendments also enhanced the complexity of the core microbiome. Identification of putative keystone taxa revealed that the latter stage of decomposition is more influenced by saprotrophic fungi. Members of Devosiaceae were significantly enriched upon inorganic nutrient addition and were also positively associated with microbial biomass C. Overall, this study elucidates the microbial dynamics and key taxa that underpin potentially enhanced carbon sequestration using inorganic nutrients alongside crop residues.

88. 题目: Interaction of Dissolved Organic Matters and Microplastics Regulates the Transport of Microplastics in Saturated Porous Media
文章编号: N24041407
期刊: ACS ES&T Engineering
作者: Miao-Miao Tan, Li-Juan Feng, Song-Zu Bian, Jian-Lu Duan, Xiao-Hua Li, Xiao-Dong Sun, Yu-Chen Sun, Shu-Guang Wang, Xian-Zheng Yuan
更新时间: 2024-04-14
摘要: The transport behavior of microplastics in soil environments is significantly affected by dissolved organic matter (DOM). However, the regulation of different types of DOM on the transport of microplastics in media is poorly understood, especially at a quantitative level. In this study, we found that three types of DOM, humic acid (HA), bovine serum albumin (BSA), and sodium alginate (SA), promoted the transport of polystyrene microplastics (PS) in column experiments. The transport of PS was stronger with increasing DOM concentrations. Among the three types of DOM, HA promoted the mobility of PS the most due to electrostatic repulsion and steric hindrance. Through the combination of Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, isothermal titration calorimetry (ITC), and colloidal atomic force microscopy (AFM), we found that the interactions between PS and HA, as well as the BSA, were mainly van der Waals forces, hydrogen bonding, and hydrophobic forces. In contrast, the interactions between PS and SA were mostly hydrogen bonding and electrostatic forces. The results provide a deep understanding of the interfacial interaction of microplastics and DOM in the transport process, based on both experimental measurements and model predictions, and are of great significance to evaluate the fate of microplastics in soil environments.

89. 题目: Untapped potential of food waste derived biochar for the removal of heavy metals from wastewater
文章编号: N24041406
期刊: Chemosphere
作者: Asma Moureen, Muhammad Waqas, Naeem Khan, Fariha Jabeen, Cosimo Magazzino, Nargis Jamila, Dilek Beyazli
更新时间: 2024-04-14
摘要: The presence of heavy metals in water pose a serious threat to both public and environmental health. However, the advances in the application of low cost biochar based adsorbent synthesize from various feedstocks plays an effective role in the of removal heavy metals from water. This study implies the introduction of novel method of converting food waste (FW) to biochar through pyrolysis, examine its physiochemical characteristics, and investigate its adsorption potential for the removal of heavy metals from water. The results revealed that biochar yield decreased from 18.4 % to 14.31 % with increase in pyrolysis temperature from 350 to 550 °C. Likewise, increase in the pyrolysis temperature also resulted in the increase in the ash content from 39.87 % to 42.05 % thus transforming the biochar into alkaline nature (pH 10.17). The structural and chemical compositions of biochar produced at various temperatures (350, 450, and 550 °C) showed a wide range of mineralogical composition, and changes in the concentration of surface functional groups. Similarly, the adsorption potential showed that all the produced biochar effectively removed the selected heavy metals from wastewater. However a slightly high removal capacity was observed for biochar produced at 550 °C that was credited to the alkaline nature, negatively charged biochar active sites due to O-containing functional groups and swelling behavior. The results also showed that the maximum adsorption was recorded at pH 8 at adsorbent dose of 2.5 g L with the contact time of 120 min. To express the adsorption equilibrium, the results were subjected to Langmuir and Freundlich isotherms and correlation coefficient implies that the adsorption process follows the Freundlich adsorption isotherm. The findings of this study suggest the suitability of the novel FW derived biochar as an effective and low cost adsorbent for the removal of heavy metals form wastewater.

90. 题目: Multi-stage aeration regime to regulate organic conversion toward gas alleviation and humification in food waste digestate composting
文章编号: N24041405
期刊: Journal of Environmental Management
作者: Jingwen Cheng, Lanxia Zhang, Xingzu Gao, Tong Shi, Guoxue Li, Wenhai Luo, Chuanren Qi, Zhicheng Xu
更新时间: 2024-04-14
摘要: Aerobic composting has been considered as a pragmatic technique to convert food waste digestate into high-quality biofertiliser. Nevertheless, massive gaseous emission and immature product remain the primary challenges in food waste digestate composting. Thus, the performance of multi-stage aeration regimes to improve gaseous emissions and organic humification during food waste digestate composting was investigated in this study. In addition to continuous aeration with a constant intensity of 0.3 L kg·dry mass (DM)·min, two multi-stage decreased aeration regimes were designed as “0.3-0.2-0.1” and “0.3-0.1-0.1” L·kg·DM·min from the thermophilic to cooling and then mature stages, respectively. Results showed that the decreased aeration regimes could alleviate nitrous oxide (NO) and ammonia (NH) emission and slightly enhance humification during composting. The alleviated NO and NH emission were mainly contributed by abiotically reducing gaseous release potential as well as biotically inactivating denitrifers ( and ) and proliferating to reduce nitrate availability under lower aeration supply. The “0.3-0.2-0.1 L kg·DM·min” regime exhibited a more excellent performance to alleviate NO and NH emission by 27.5% and 16.3%, respectively. Moreover, the decreased aeration regimes also favored the enrichment of functional bacteria ( and ) to accelerate lignocellulosic biodegradation and thus humic acid synthesis by 6.5%–11.2%. Given its better performance to improve gaseous emissions and humification, the aeration regime of “0.3-0.2-0.1 L kg·DM·min” are recommended in food waste digestate composting in practice.

91. 题目: Biochar compost associations affect the absorption, translocation and bioavailability of legacy and newly introduced cadmium in lettuce
文章编号: N24041404
期刊: Journal of Cleaner Production
作者: Qizhen Liu, Zhiqin Chen, Qiang Lin, Jie Yuan, Yaru Liu, Lukuan Huang, Ying Feng
更新时间: 2024-04-14
摘要: Biochar is an environment-friendly immobilizing agent and performs better in remediating soil cadmium (Cd) along with compost. However, little attention has been paid to the effects of the intrinsic properties of biochar in combination with compost on the phytoavailability and translocation of legacy Cd (Cd) and newly introduced Cd (Cd) in the soil-lettuce-human system. Therefore, in this study, four biochars originated from pig manure, sewage sludge, wood chip, and rice husk were produced into mm/μm/nm-particles, which was combined with compost respectively. The impact of the different particle-size biochar compost blends (BCCM) on the translocation, bioaccessibility and bioavailability of Cd and Cd was investigated through applying enriched isotope tracing and Caco-2 cell model. The results showed that the lowest labile Cd (ECd) values were found in nm-BCCM by converting exchangeable Cd into other unusable Cd forms. nm-BCCM has a significant reduction in Cd uptake, accumulation, and translocation by lettuce a nm-BCCM increased the cell wall percentages and decreased the solution components of Cd in the root. Despite almost immobilizing agents did not decrease the bioaccessibility and bioavailability of Cd, the lower bioaccessible and bioavailable Cd contents imply nm-BCCM can guarantee the public was minimally exposed to the risk of Cd. These results suggested that combining nm-biochar and compost had greater potential to reduce Cd and Cd translocation and absorption in complex environmental systems.

92. 题目: Preparation of Simple Bicyclic Carboxylate-Rich Alicyclic Molecules for the Investigation of Dissolved Organic Matter
文章编号: N24041403
期刊: Environmental Science & Technology
作者: Alexander J Craig, Lindon W K Moodie, Jeffrey A Hawkes
更新时间: 2024-04-14
摘要: Dissolved organic matter (DOM) is a vast and complex chemical mixture that plays a key role in the mediation of the global carbon cycle. Fundamental understanding of the source and fate of oceanic organic matter is obscured due to poor definition of the key molecular contributors to DOM, which limits accurate sample analysis and prediction of the Earth’s carbon cycle. Previous work has attempted to define the components of the DOM through a variety of chromatographic and spectral techniques. However, modern preparative and analytical methods have not isolated or unambiguously identified molecules from DOM. Therefore, previously proposed structures are based solely on the mixture’s aggregate properties and do not accurately describe any true individual molecular component. In addition to this, there is a lack of appropriate analogues of the individual chemical classes within DOM, limiting the scope of experiments that probe the physical, chemical, and biological contributions from each class. To address these problems, we synthesized a series of analogues of carboxylate-rich alicyclic molecules (CRAM), a molecular class hypothesized to exist as a major contributor to DOM. Key analytical features of the synthetic CRAMs were consistent with marine DOM, supporting their suitability as chemical substitutes for CRAM. This new approach provides access to a molecular toolkit that will enable previously inaccessible experiments to test many unproven hypotheses surrounding the ever-enigmatic DOM.

93. 题目: The influence of molecular weight of adsorbed natural organic matter on the removal of dissolved black carbon by coagulation
文章编号: N24041402
期刊: Chemical Engineering Journal
作者: Minmin Liu, Qingxuan Lu, Nigel Graham, Wenzheng Yu
更新时间: 2024-04-14
摘要: Black carbon is a ubiquitous contaminant that is widely present in water sources, where, as dissolved (<0.2-µm) black carbon (DBC), it contributes to the pool of disinfection byproduct precursors. DBC, in the form of nano-scale particles, provides a large surface area to adsorb natural organic matter (NOM) and while NOM with large molecular weight (MW) is readily removed by coagulation, it is unclear whether the presence of different MW fractions of NOM adsorbed on DBC improves or impairs its removal. In this study, experiments have been conducted to investigate the interactions between DBC with different NOM MW fractions, and alum coagulant. The results found that as the MW of NOM decreased, the total organic carbon of adsorbed NOM on the DBC nanoparticles (NPs) decreased, whereas the DBC removal increased due to the increased destabilization of DBC NPs. As the MW of NOM decreased, the size of DBC with adsorbed NOM decreased, whereas the size of its flocs increased. As the MW of NOM decreased, the variation of carbon to oxygen ratio decreased, indicating the aggregation degree of DBC adsorbed with NOM increased. It was observed that as the MW of adsorbed NOM increased, there was a decrease in aggregation of the DBC, as well as the amount of aggregated DBC NPs detected in the flocs. The findings of this study provide important new information concerning the mutual interaction between NOM and DBC NPs and the effect of NOM on the fate of DBC during underground water treatment.

94. 题目: Comprehensive effects of salinity, dissolved organic carbon and copper on mortality, osmotic regulation and bioaccumulation of copper in Oryzias melastigma
文章编号: N24041401
期刊: Science of the Total Environment
作者: Liang Cui, Xiaoguang Li, Yan Luo, Xiangyun Gao, Li Chen, Xubo Lv, Jiayu Peng, Hua Zhang, Kun Lei
更新时间: 2024-04-14
摘要: Cu, as an essential and toxic element, has gained widespread attention. Both salinity and dissolved organic carbon (DOC) are known to influence Cu toxicity in marine organisms. However, the intricate interplay between these factors and their specific influence on Cu toxicity remains ambiguous. So, this study conducted toxicity tests of Cu on . The experiments involved three salinity levels (10, 20, and 30 ppt) and three DOC levels (0, 1, and 5 mg/L) to comprehensively investigate the underlying mechanisms of toxicity. The complex toxic effects were analyzed by mortality, NKA activity, net Na flux and Cu bioaccumulation in . The results indicate that Cu toxicity is notably influenced by both DOC and salinity. Interestingly, the discernible variation in Cu toxicity across different DOC levels diminishes as salinity levels increase. The presence of DOC enhances the impact of salinity on Cu toxicity, especially at higher Cu concentrations. Additionally, Visual MINTEQ was utilized to elucidate the chemical composition of Cu, revealing that DOC had a significant impact on Cu forms. Furthermore, we observed that fluctuations in salinity lead to the inhibition of Na/K-ATPase (NKA) activity, subsequently hindering the inflow of Na. The effects of salinity and DOC on the bioaccumulation of copper were not significant. The influence of salinity on Cu toxicity is mainly through its effect on the osmotic regulation and biophysiology of . Additionally, DOC plays a crucial role in the different forms of Cu. Moreover, DOC-Cu complexes can be utilized by organisms. This study contributes to understanding the mechanism of copper's biological toxicity in intricate marine environments and serves as a valuable reference for developing marine water quality criteria for Cu.

95. 题目: Temporal and depth-dependent variations in soil aggregate-associated organic carbon in reclaimed coastal poplar plantations
文章编号: N24041307
期刊: Land Degradation & Development
作者: Jiangwei Liu, Xiangrong Cheng, Haidong Xu, Shuoxin Zhang
更新时间: 2024-04-13
摘要: Coastal reclamation alters the ecological environment of wetlands and influences global carbon cycles. However, variations in soil organic carbon fractions and stability in the soil profile during reclamation, particularly in the subsoil, remain unclear. In this study, soil aggregate-associated organic carbon and its stability were investigated in soil profiles (0–100 cm) at different reclamation times (0, 24, 44, and 64 years) in coastal poplar plantations in East China. Total soil organic carbon concentrations in the topsoil (0–40 cm) increased with increasing reclamation time but varied little in the subsoil (40–100 cm). In the topsoil, the soil organic carbon concentrations in different aggregate fractions tended to increase with increasing reclamation time, which was enhanced mainly by particulate organic carbon within macro-aggregates. In the subsoil, soil organic carbon concentrations increased in the micro-aggregate fraction and decreased in the silt and clay fraction with increasing reclamation time, whereas the opposite changes led to smaller variations in total soil organic carbon. This relative balance was regulated by micro-aggregate formation via new organic matter input (e.g., root litter) and old mineral-associated organic carbon depletion. Regardless of the soil horizon, soil aggregate stability increased with reclamation time, whereas the total particulate organic carbon/mineral-associated organic carbon ratio increased with increasing reclamation time, implying that the soil organic carbon stability decreased, which may be attributed to an increase in the vulnerability of soil organic matter to mineralization as the reclamation progresses. These findings indicate that long-term plantation development influences aggregate-associated organic carbon accrual throughout the soil profile in reclaimed coastal land. Thus, effective management is required to improve soil organic carbon accrual in coastal woodland subsoil, which is crucial for increasing soil carbon sequestration.

96. 题目: Source-to-Sink Pathways of Dissolved Organic Carbon in the River-Estuary-Ocean Continuum: A Modeling Investigation
文章编号: N24041306
期刊: Biogeosciences
作者: Jialing Yao, Zhi Chen, Jianzhong Ge, Wenyan Zhang
更新时间: 2024-04-13
摘要: . Transport and cycling of dissolved organic carbon (DOC) are most active in estuaries. However, a comprehensive understanding of the sources, sinks, and transformation processes of DOC throughout the river-estuary-ocean continuum is yet to be derived. Taking the Changjiang Estuary and adjacent shelf sea as a case study area, this study applies a physics-biogeochemistry coupled model to investigate DOC cycling the river-estuary-ocean continuum. DOC is classified into two types depending on the origin, namely terrigenous DOC (tDOC) and marine DOC (mDOC). Simulation results were compared with observation and showed a satisfactory model performance. Our study indicates that in summer, the distribution of DOC in the Changjiang Estuary is driven by both hydrodynamics and biogeochemical processes, while in winter, it is primarily driven by hydrodynamics. The spatial transition from terrigenous-dominated DOC to marine-dominated DOC occurs mainly across the contour line of a salinity of 20 PSU. Additionally, the source-sink patterns in summer and winter are significantly different, and the gradient changes in chlorophyll-a indicate the transition between sources and sinks of DOC. A five-year averaged budget analysis of the model results indicates that the Changjiang Estuary has the capability to export DOC, with tDOC contributing 31 % and mDOC accounting for 69 %. The larger proportion of mDOC is primarily attributed to local biogeochemical processes. The model offers a novel perspective on the distribution of DOC in the Changjiang Estuary and holds potential for its application in future organic carbon cycling of other estuaries.

97. 题目: Uncovering the Nonnegligible Mechanism of Degrading Structural Extracellular Polymeric Substances for Nitrate Removal in Psychrophilic (15 °C) Waste-Activated Sludge Fermentation
文章编号: N24041305
期刊: ACS ES&T Water
作者: Yi-Bo Wang, Jie Tang, Yang Yan, Si-Di Hong, Si-Jie Zheng, Xing-Chen Huang, Man Chen, Shan-Fei Fu, Xueming Chen, Raymond Jianxiong Zeng, Kun Dai, Fang Zhang
更新时间: 2024-04-13
摘要: Wastewater treatment plants (WWTPs) are being challenged to operate as carbon-neutral and energy-efficient systems. The structural extracellular polymeric substances (St-EPS) in waste-activated sludge (WAS), such as alginate, were revealed to form an architectural gel matrix, hindering the psychrophilic hydrolysis and acidogenesis and its application in nitrate removal. Consequently, volatile fatty acid (VFAs) production for nitrate removal at 15 °C is demonstrated by a novel, enriched psychrophilic consortium for alginate-degrading and nitrate-removing. Both alginate lyase (EC 4.2.2.3) and oligo-alginate lyase (EC 4.2.2.26) are identified for alginate utilization by the metaproteomics analysis. A high nitrate removal rate of 7.6 (WAS as the substrate) to 13.0 (alginate as the substrate) mgN/(gVSS h) was achieved. By combining high-throughput and PacBio sequencing and metagenomics analysis, two genera of Bacteroides (69.4%) and Dysgonomons (12.8%) are revealed to enhance psychrophilic WAS fermentation. The VFAs can be utilized by denitrifiers for nitrate removal in an indirect pathway. Moreover, other genera of denitrifiers (Pseudomonas, 0.11%; and Massilla, 0.003%) can excrete alginate lyase, indicating the dual merits of St-EPS degradation and nitrate removal in the direct pathway. This work extends the application of WAS for denitrifiers, providing a new carbon-neutral and energy-efficient system in WWTPs, especially under psychrophilic conditions.

98. 题目: Cow Manure Pellet Biochar: Leaching of Cu(II) and Its Corresponding Influences on Tetracycline Adsorption
文章编号: N24041304
期刊: Water, Air, & Soil Pollution
作者: Haoxiang Xiong, Xiaojing Zhao, Kai Song, Zengling Yang, Lujia Han
更新时间: 2024-04-13
摘要:

Valorizing heavy metal–contaminated livestock manure into biochar and thus used for decontaminating antibiotics in farm wastewater is an agricultural circular economy strategy concept. Aiming to illustrate the dynamic and underlying mechanism of Cu(II) leaching from cow manure pellet biochar and its influences on the biochar’s ability to adsorb tetracycline, cow manure–derived pellet biochar with a pyrolysis temperature of 800 ℃ was used in this study. A series of heavy metal leaching experiments in Britton-Robinson (BR) buffer and tetracycline (TC) standard aqueous solution and tetracycline adsorption experiments including isothermal adsorption and kinetics adsorption were conducted. Conventional lab wet chemical analysis, quantum chemistry simulation, and micro-CT technique were employed to fully characterize the resulting samples. The results show that the leaching behaviors of Cu(II) from cow manure pellet biochar were different in BR system and TC system. As indicated by the quantum chemistry simulation, leached Cu(II) participated in the TC adsorption process of biochar by forming tetracycline-copper complexes and accelerated the adsorption rate of TC on biochar. The revealed interaction between heavy metal and antibiotic during the adsorption process will be significant to help a more comprehensive interpretation of the complex adsorption mechanism of biochar. This study provides a more comprehensive understanding of the intricate mechanism of organic pollutant adsorption on biochar.

99. 题目: The application of magnetite biochar composite derived from parthenium hysterophorus for the adsorption of methylene blue from aqueous solution
文章编号: N24041303
期刊: Frontiers in Environmental Science
作者: Meseret Dawit Teweldebrihan, Mikiyas Abewaa Gnaro, Megersa Olumana Dinka
更新时间: 2024-04-13
摘要: The removal of toxic and harmful dyes like methylene blue (MB) from textile wastewater is necessary to reduce environmental pollution. Therefore, this study is aimed at removing MB from an aqueous solution using magnetite-doped biochar of parthenium hysterophorus. Biochar was prepared through pyrolysis techniques at 500 for 2 h whereas the magnetite and composite material were developed using coprecipitation methods. Herein, NaNO3 and FeSO4. 7H2O were utilized as precursor materials and NaOH as a precipitating agent for preparation of magnetite. Furthermore, pH point of zero charge (pHpzc), Scanning Electron microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD) are characterization techniques used to evaluate the nature of the composite material. On the other hand, a full factorial design involving four factors at two levels (24) such as pH (3 and 9), contact time (10 and 40 min), initial dye concentration (100 and 150 mg/L) and adsorbent dosage of 0.01 and 0.04 g/100 mL was used to design and optimize the batch adsorption of MB from an aqueous solution. As a result, a maximum removal efficiency of 99.99% was attained at optimum operating conditions of pH 9, contact time 40 min, initial MB concentration 100 mg/L and adsorbent dosage of 0.04 g/100 mL. Langmuir, Freundlich and Temkin isotherm models were used to investigate the adsorption isotherm in which Freundlich isotherm with a maximum R2 of 0.98 was found to describe the adsorption process inferring multilayer and heterogeneous surface interaction. Additionally, the thermodynamics study depicts that the nature of the adsorption is spontaneous, endothermic and feasible. On the other hand, the chemosorption nature is revealed by the pseudo second kinetics model with a maximum R2 of 0.99. Finally, the remarkable reusability ranging from 99.98% to 97.6% for five consecutive cycles proved that the magnetic biochar derived from parthenium hysterophorus can be used as an effective adsorbent for the decolourization of MB saturated effluent at an industrial scale.

100. 题目: Effect of humic acid on visible light photocatalytic inactivation of bacteriophage f2 with electrospinning Cu-TiO2 nanofibers: insight into the mechanisms
文章编号: N24041302
期刊: Environmental Science and Pollution Research
作者: Rong Cheng, Jin-cheng Xia, Liang-jie Shen, Zhi-peng Shen, Lei Shi, Xiang Zheng, Jian-zhong Zheng
更新时间: 2024-04-13
摘要:

Photocatalytic disinfection is a promising technology with low cost and high efficiency. However, most of the current studies on photocatalytic disinfection ignore the widespread presence of natural organic matter (NOM) in water bodies, so the incomplete conclusions obtained may not be applicable. Herein, this paper systematically studied the influence of humic acid (HA), one of the most important components of NOM, on the photocatalytic inactivation of bacteriophage f2 with electrospinning Cu-TiO2 nanofibers. We found that with the addition of HA, the light transmittance of the solution at 550 nm decreased from 94 to 60%, and the band gap of the photocatalyst was increased from 2.96 to 3.05 eV. Compared with reacting without HA, the degradation amount of RNA of f2 decreased by 88.7% after HA was added, and the RNA concentration increased from 1.95 to 4.38 ng·μL−1 after the reaction. Hence, we propose mechanisms of the effect of HA on photocatalytic disinfection: photo-shielding, passivation of photocatalysts, quenching of free radicals, and virus protection. Photo-shielding and photocatalyst passivation lead to the decrease of photocatalyst activity, and the reactive oxygen species (ROSs) (·OH, ·O2, 1O2, H2O2) are further trapped by HA. The HA in water also can protect the shape of phage f2 and reduce the leakage of protein and the destruction of ribonucleic acid (RNA). This work provides an insight into the mechanisms for the influence of HA in photocatalytic disinfection process and a theoretical basis for its practical application.

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