论文检索

总访问量：6226691次

总访客量：519897人

所有论文

361. 题目: Influence of organic matter on treatment and resource utilization of dredged river sediment
文章编号: N26081312
期刊: Journal of Environmental Management
作者: Chunzhen Fan, Zeyi Wang, Chun Zhao, Qing Wei, Xiangyong Zheng, Min Zhao, Ye Tang, Zhenmin Jin
更新时间: 2026-08-13
摘要: River sediment dredging is an important way to solve internal pollution in rivers and improve their water environment. How to dispose of and utilize these dredged sediment has become a global environmental issue. Organic matter (OM), as the main component of dredged river sediment, exhibits significant influence on substance migration and transformation, furthering affecting their treatment and resource utilization processes. This review systematically summarizes treatment and resource utilization methods of dredged river sediment, and discusses the influence of OM on these disposal processes. The treatment processes mainly involve in physicochemical and bio-ecological methods. Heterogeneity of OM determines the treatment difficulty of organic-rich sediment. During their treatment processes by advanced oxidation, nanoconfinement-based catalyst design promotes selective non-radical pathways that resist scavenging by humic substances. When reacting with humic substances, the second-order rate constant of 1O2 is 1000 times that of ·OH. Machine learning-assisted optimization enables efficient catalyst screening and precise tuning of reaction parameters. The main resource utilization processes are ecological restoration, construction and building material manufacturing, energy recovery, environmental eco-friendly materials. OM content governs resource utilization strategies of dredged river sediment. The sediment with a low OM content (<5%) is suitably utilized as building materials and ecological substrates, that with medium OM content (5–10%) require pretreatment before utilization. But, when OM content exceeded 10%, the sediment is prioritized for energy recovery, and its calorific value increases by 1.5–2.5 MJ/kg for every 10% increase in OM content. This review systematically elucidates the critical constraints of OM, aiming to provide theoretical basis for selecting cost-effective treatment processes and resource utilization pathways for dredged river sediment with varying OM content, thereby reducing disposal costs and enhancing product quality stability.

362. 题目: Application of biochar produced through co-pyrolysis of oily sludge and agricultural waste in cement-based materials
文章编号: N26081311
期刊: Journal of Environmental Management
作者: Guangyu Shi, Xinyu Chen, Jingwen Huang, Xiyuan Wang, Lingzhao Kong, Yu Hu
更新时间: 2026-08-13
摘要: This study explored the use of biochars derived from the co-pyrolysis of oily sludge and agricultural wastes as partial cement replacements in mortar. To evaluate the effect of mixed-feedstock biochars on cement mortar, oily sludge was co-pyrolyzed with rice husk, wheat straw, or corn core at 500°C and a 1:1 mass ratio, producing RHB, WSB, and CHB. respectively. The physicochemical properties of the biochars were characterized by SEM, XRD, FTIR, XRF, and proximate analysis. Mortars containing 1%, 3%, 5%, and 8% biochar were then evaluated for strength, water absorption, porosity, setting time, and microstructure. Compared with Common cement mortar, CHB and RHB showed better physicochemical properties and more effectively improved mortar performance. The addition of 1% RHB, 1% CHB, and 3% WSB increased compressive strength by 8.2%, 15.2%, and 4.0%. The study also revealed changes in key mortar properties, including porosity, water absorption, and setting time. Overall, biochar derived from the co-pyrolysis of oily sludge and agricultural wastes significantly enhanced the mechanical properties of cement-based composites, demonstrating its potential for application in cementitious materials.

363. 题目: Extracellular polymeric substances as a bioflocculant for clay and mud flocculation
文章编号: N26081310
期刊: Journal of Environmental Chemical Engineering
作者: Adarsh Shajimon, Mark van Loosdrecht, Claire Chassagne
更新时间: 2026-08-13
摘要: Extracellular polymeric substances (EPS) from wastewater sludge are a promising biodegradable alternative to synthetic polyacrylamide-based flocculants. EPS can be extracted from both conventional activated sludge and aerobic granular sludge (AGS). In this study, we focus on EPS from AGS (named Kaumera). We found that Kaumera when used as extracted does not flocculate with clay particles. However, aging (solubilizing) Kaumera in water of low conductivity at a particular pH (≈ 3 h at pH 12 and 2–3 days at pH 7) leads to significant flocculation. The optimal flocculation (largest median floc sizes, D50) is found around 200 mg/g, even so flocculation occurred for dosages as low as 33 mg/g, which is the lowest dosage used in this article. Furthermore, the maximum floc sizes are attained within 20 min of stirring between clay and EPS, when the flocculant dosage is close to the optimal dosage. This study presents a working protocol for flocculating clay and mud suspensions using EPS extracted from wastewater residual sludge (AGS) and similar biopolymers as bioflocculants.

364. 题目: Soil-order stratified pedotransfer functions for particulate and mineral-associated organic carbon in Taiwan Topsoils: Contrasting controls in Ultisols and Inceptisols
文章编号: N26081309
期刊: Geoderma
作者: Mel Adelle Ocba, Chun-Chien Yen, Liang-Ching Hsu, Yen-Lin Cho, Han-Yu Chen, Mei-Hsia Huang, Heng Yi Teah, Yu-Min Tzou, Chien-Hui Syu, Yu-Ting Liu
更新时间: 2026-08-13
摘要: Understanding how soil organic carbon (SOC) fractions respond to environmental and physicochemical factors is critical for improving SOC modeling. However, the mechanisms underlying particulate (POC) and mineral-associated organic carbon (MAOC) accumulation, as well as the development of estimation models, remain poorly constrained in tropical and subtropical soils. This study examined 84 Ultisols and 66 Inceptisols to identify the key drivers of POC and MAOC formation across Taiwan and developed soil-order-stratified pedotransfer functions (PTFs) using stepwise multiple linear regression (SMLR). Compared to Random Forest and Cubist models, SMLR showed comparable predictive performance (R2 = 0.68–0.90) while revealing contrasting dominant controls, suggesting distinct sequestration mechanisms across soil orders. In Ultisols, MAOC sequestration follows a sorptive pathway constrained by mineralogy. However, mineral surfaces appear to approach a saturation threshold, limiting further C accrual. Conversely, MAOC in Inceptisols is driven by a microbial necromass pathway, where sequestration is dictated by nitrogen availability, pH, and specific surface area rather than mineral abundance. The Inceptisol models exhibited relatively lower R2 and higher RMSE, reflecting the inherent stochasticity of younger, less-buffered profiles. Notably, the negative influence of crystalline Fe (hydr)oxides on MAOC of Inceptisols, coupled with its strong negative correlations with temperature, underscores the vulnerability of these developing soils to climate-driven C loss. Overall, our results demonstrate that soil-order stratification provides a robust and permanent structural framework for regional SOC prediction. By capturing pedogenic constraints that persist through land-use transitions, this approach establishes a stable baseline for quantifying C sequestration potential across diverse landscapes.

365. 题目: Exogenous Bacillus drives organic matter transformation in wheat straw solid-state fermentation: Roles of DOM dynamics and microbial networks
文章编号: N26081308
期刊: Environmental Technology & Innovation
作者: Yushuai Wei, Siwei Pu, Chunhe Deng, Zhaodi Wang, Huan Meng, Chuanzhen Ma, Jiayi Cao, Jianan Du, Xinyu Song, Fengshan Yang
更新时间: 2026-08-13
摘要: Solid-state fermentation (SSF) of wheat straw is a sustainable approach to valorize lignocellulosic biomass, yet the molecular ecological mechanisms of organic matter (OM) transformation mediated by exogenous Bacillus remain unclear. This study investigated the dynamics of physicochemical/biological indicators, dissolved organic matter (DOM) fluorescent components and microbial communities during wheat straw SSF inoculated with three pure Bacillus strains (B. subtilis, B. velezensis, B. stercoris) and their composite agent (MB), using EEM-PARAFAC, high-throughput sequencing, correlation network analysis and structural equation modeling (SEM). The results showed that the inoculation of Bacillus promoted the conversion of labile low-molecular-weight (LMW) DOM to recalcitrant high-molecular-weight (HMW) humic-like DOM, thereby increasing the degree of humification. These changes contributed to the improvement of the germination index (GI). Among the tested Bacillus strains, B. velezensis exhibited the best comprehensive performance, achieving 26.3% OM degradation, 49.96% humic acid-like component C5, and a GI of 133%. Compared with the single-strain treatments, MB simultaneously enhanced the complexity of both bacterial and fungal co-occurrence networks. SEM confirmed microbial diversity directly drove directional DOM transformation by modulating biological indicators and environmental factors. This study uncovers the differential regulatory mechanism of exogenous Bacillus on microbial communities and DOM transformation, providing a theoretical and technical basis for designing high-efficiency microbial agents for lignocellulosic biomass valorization.

366. 题目: Adsorptive Removal of Oxytetracycline From Aqueous Solutions Using KOH‐Activated Biochar Derived From Grape‐Leaf Waste: Adsorption Properties and Mechanism
文章编号: N26081307
期刊: Clean - Soil Air Water
作者: Di Liu, Yanrong Cai, Xuechun Yu, Xinping Yang, Qiong Wang
更新时间: 2026-08-13
摘要: Oxytetracycline (OTC) was a kind of spectral antibacterial agent and widely used in livestock farming and disease prevention. It easily remained in the environment and was harmful to the health of humans and animals. Grape leaves, the waste of the grape production base in Beizhen, were used as raw materials to produce the biochar. The effects of adsorption time, temperature, adsorbent amount, pH, and OTC initial concentration on OTC adsorption capacity were investigated. The Box‐Behnken method was used to optimize the experimental design. The grape‐leaf biochar was modified with KOH for the efficient adsorptive removal of OTC in the wastewater. Compared with the unmodified biochar, the modified biochar can quickly adsorb low concentrations of OTC and has a better adsorption effect. The adsorption capacity of GLBC‐2OH (modified biochar) was calculated by the Langmuir isotherm as 116.96 mg/g. The OTC removal rate can reach over 85%. The adsorption mechanism of GLBC‐2OH for the OTC consisted of pore filling, π‐π interaction, electrostatic interaction, hydrogen bonding, and the complexation between the OTC and the biochar. The GLBC‐2OH adsorption was more suitable for pseudo‐second‐order kinetics and the Langmuir isotherm model, which was the chemisorption of monolayer adsorption. The analysis of thermodynamics showed that adsorption was a spontaneous, endothermic, and entropy‐increasing reaction. The grape leaves were waste, and the biochar made from them was an effective adsorbent material for the removal of OTC in wastewater. Reuse of grape waste can increase income and protect the environment.

367. 题目: Design parameters and electrical conductivity shape dissolved organic matter aromaticity in full-scale constructed wetlands
文章编号: N26081306
期刊: Bioresource Technology
作者: Ying Guo, Junjie Huang, Huijun Xie, Qiang Kong, Jiaxing Lu, Mingde Ji, Qian Wang, Congcong Zhao, Xiaotong Shen, Jian Zhang
更新时间: 2026-08-13
摘要: Constructed wetlands (CWs) often serve as final polishing systems before wastewater enters receiving waters, where active biogeochemical reactions can reshape dissolved organic matter (DOM) and influence various ecological processes in downstream aquatic systems. However, DOM variations and their associated factors in full-scale CWs remain poorly constrained. Combining a field survey of 57 sites across 14 full-scale CWs in Shandong, China, with laboratory experiments, this study examined changes in DOM characteristics, the key factors associated with these changes, and their potential roles. The results indicated that, despite no significant change in bulk DOC concentrations, CWs generally shifted DOM toward greater aromaticity and hydrophobicity and reduced low molecular weight neutrals (LN, <350 Da). Multiple statistical models consistently identified plant density (PD), electrical conductivity (EC), and light conditions (LC) as dominant factors associated with these shifts, with a predominant direct association (coefficient = 0.56) and a possible microbially linked indirect association (0.30). Specifically, the direct associations of PD and EC with enhanced DOM aromaticity and hydrophobicity may be attributable to plant litter inputs and the self-assembly of LN into building blocks (300–500 Da), respectively, while the indirect association may involve microbial processing that enriched or retained humic substances and aromatic formulas while depleting LN. In contrast, LC showed opposing effects, likely reflecting direct photodegradation and possible indirect microbial effects. Overall, CWs play a dual role by reducing labile DOM while potentially increasing ecological risks associated with aromatic effluents, and the pivotal roles of PD, EC, and LC highlight the need to align CW design with influent characteristics to balance these outcomes.

368. 题目: Microbial metabolic mechanisms underlying organic nitrogen formation mediated by the coupling between the tricarboxylic acid cycle and nitrogen-transformation processes
文章编号: N26081305
期刊: Bioresource Technology
作者: Jing Su, Zishuai Zhang, Yawen Wu, Xiaofan Sun, Chengyang Jiao, Qiuling Dang
更新时间: 2026-08-13
摘要: Organic nitrogen (ON) transformation is critical for nitrogen retention during composting. Here, pilot-scale windrow composting experiments were conducted using food waste digestate composting (FW) and chicken manure composting (CM) to investigate associations between microbial functional potential and ON dynamics through glutamate-centered carbon–nitrogen metabolism. The results supported a potential pathway in which α-ketoglutarate from the tricarboxylic acid cycle (TCA) coupled with ammonium nitrogen (NH4+) through glutamate metabolism and was associated with ON dynamics. Core functional genes (FW: e.g., glnA, GDH2, GLUD1_2; CM: e.g., gltB, glnA, ureC) were identified, and their associated microbes (FW: e.g., Novibacillus, Planifilum; CM: e.g., Dietzia, Brevibacterium) were further determined using gene-taxon association analysis. Different regulatory patterns were observed between the two practical composting systems The CM microbial network was more connected than the FW network, with 10,732 versus 9,089 edges and graph densities of 0.194 versus 0.148. Additionally, In FW, functional genes made the largest independent contribution to ON variation (25.3%), and ON dynamics were more closely associated with the glutamate dehydrogenase (GDH) pathway and carbon-skeleton availability. In CM, gene-associated microbes made the largest independent contribution (14.2%). Although the glutamine synthetase/glutamate synthase (GS/GOGAT) pathway and urease-related processes exhibited efficient metabolic coupling, peptide-like DON molecular signatures remained relatively abundant during most composting stages. These findings provide a mechanistic framework for optimizing nitrogen transformation and retention during composting.

369. 题目: Explainable Digital Soil Organic Carbon Mapping in Himalayan Region of India’s Northeastern State Based on Gradient Boosting Regression Technique
文章编号: N26081304
期刊: Applied Soil Ecology
作者: Abhishek Kumar Singh, Chandan Kumar, Bipal Khanal
更新时间: 2026-08-13
摘要: Soil Organic Carbon (SOC) plays a vital role in soil fertility and watershed stability. However, its spatial variability often makes it difficult for traditional sampling methods to capture a continuous representation. Recent studies on digital soil mapping use random cross-validation, which can substantially overestimate model performance because of spatial autocorrelation. To overcome this limitation, this study introduces a spatially robust and interpretable framework for mapping SOC in the Ranikhola sub-watershed, covering an area of 18 km2. The proposed framework integrates terrain attributes, Landsat-derived spectral indices with spatial cross-validation, and additionally employs explainable machine learning techniques. A total of 100 soil samples (0–10 cm) were collected. These sampling locations were generated using the Conditioned Latin Hypercube Sampling (cLHS) method. Two machine learning models, Random Forest (RF) and Gradient Boosting Regression (GBR), were utilised using spatial cross-validation to ensure unbiased field-scale generalisation. Experimental result shows that GBR achieved the most reliable performance under spatial cross-validation, attaining 0.742 R2 value, 0.366 g kg−1 RMSE, and 0.255 g kg−1 MAE using the final selected model. GBR is the final selected model using which an SOC map is generated which shows higher SOC concentrations in areas with low slope, concave regions, and abundant vegetation, while SOC values are lower on elevated, convex slopes and on bare or built-up surfaces. These results align with the dynamics of erosion and deposition. Additionally, SHapley Additive exPlanations (SHAP) interpretation identified elevation, slope, Topographic Wetness Index (TWI), Enhanced Vegetation Index (EVI), and Bare Soil Index (BSI) as dominant controls with clear positive and negative directional influence. Combining all the aforementioned metrics, the uncertainty map indicated reduced confidence in mid-slope transition zones, suggesting priority areas for future sampling. Overall, this study confirms that GBR combined with spatial validation and SHAP offers a robust and interpretable approach for watershed-scale SOC assessment and soil restoration planning.

370. 题目: The impact of biochar in combination with organic fertilizer on phosphorus availability in the soil–wheat system mediated by microbial regulation
文章编号: N26081303
期刊: Applied Soil Ecology
作者: Danni Ma, Yaofeng Wang, Jiandong Sheng
更新时间: 2026-08-13
摘要: To investigate the effects of co-applying biochar and organic fertilizer on soil phosphorus migration, biochar derived from cow manure at two pyrolysis temperatures (400 °C and 700 °C) was applied together with commercial organic fertilizer at mass ratios of 3:7 and 7:3 in a wheat pot experiment. Eight treatments were established, including co-applying biochar and organic fertilizer, solo application groups and a control. The results demonstrated that the combination with 400 °C biochar enhanced phosphatase activity, improved root vascular development, and promoted a gradual release of phosphorus, maintaining soil available phosphorus levels between 27.48 and 34.50 mg·kg−1. This treatment significantly increased plant height and biomass by 60–80% and 95–140%, respectively. In contrast, the 700 °C biochar—due to its alkaline nature—induced phosphorus fixation and suppressed microbial activity, resulting in limited improvements. Co-application treatments markedly altered the soil microbial community structure (Fungal's R2 = 0.858) and activated phosphorus-metabolizing pathways. Condensed phosphorus compounds, such as O=P–O and P–O–P, were detected in these treatments. Significant positive correlations were observed among plant phosphorus content, growth traits, soil available phosphorus, and acid phosphatase activity, underscoring the role of phosphorus dynamics in regulating root architecture and nutrient transport efficiency. This study provides both theoretical and practical insights into enhancing phosphorus use efficiency through the combined application of biochar and organic fertilizer.

371. 题目: Does ten years of alternative farming systems affect POM and MAOM pools along the soil profile?
文章编号: N26081302
期刊: Agriculture, Ecosystems & Environment
作者: Chiara Poesio, Noelia Garcia–Franco, Franziska B Bucka, Christopher Just, Giacomo Tosti, Roland Bol, Alberto Agnelli
更新时间: 2026-08-13
摘要: This study evaluated the effects of grass-legume cover crops and tillage on SOM pools along the soil profile in a 10-year wheat-based rotation trial on a Cambisol under Mediterranean conditions. Three farming systems were compared: conventional integrated management (CONV), organic management with cover and intercropping crops (ORG), and no-tillage integrated management with cover crops (NOTILL). Soil samples were collected by horizons down to 60 cm and analysed for C, N, and P contents, and 13C and 15N natural abundance. Further, SOM was fractionated into particulate (POM) and mineral-associated (MAOM) organic matter; this latter was characterised for molecular composition by 13C NMR spectroscopy and specific surface area by N2-BET method. Although the quantity and diversity of residues due to the implementation with cover crops, the soil isotopic signature of ORG and NOTILL showed slight differences compared to CONV, which were evident only in the Ap1 horizon. Further, the Ap1 horizon of NOTILL showed the highest POM and MAOM contents, with values of 6.23 and 15.75 g C kg⁻¹ soil, respectively, compared with 1.06 and 7.22 g C kg⁻¹ soil in ORG and 0.84 and 6.68 g C kg⁻¹ soil in CONV. NOTILL also showed the highest abundance of O–N–alkyl C compounds in MAOM. The molecular composition of the MAOM in the ORG system did not differ from that of CONV at any depth. The similarity between ORG and CONV soils in terms of SOM pools and isotopic signatures suggested that: i) most cover crop residues are rapidly mineralised, thereby limiting their contribution to SOM pools; and ii) tillage promotes the mixing of fresh residues, characterized by low δ13C values, with organic matter stabilized over decades of previous conventional management, which likely still represents the dominant fraction of SOM. Overall, soil tillage appeared to be a key factor in controlling SOM partitioning into POM and MAOM fractions, as well as their nutrient content and molecular composition. In contrast, the benefits of cover crops were evident only under no-tillage, suggesting that soil disturbance may substantially reduce their impact on SOM.

372. 题目: Non-linear controls of soil pH and climate on radiocarbon-based turnover of soil organic carbon fractions across temperate to alpine forests
文章编号: N26081301
期刊: Soil Biology and Biochemistry
作者: Margaux Moreno-Duborgel, Claudia Guidi, Roman Flury, Sia Gosheva-Oney, Beatriz González-Domíngez, Mirjam Brühlmann, Luisa Isabell Minich, Negar Haghipour, Katrin Meusburger, Alexander Sohrab Brunmayr, Marco Griepentrog, Samuel Abiven, Mathias Mayer, Timothy Ian Eglinton, Frank Hagedorn
更新时间: 2026-08-13
摘要: Global warming is driving unprecedented changes in the soil organic carbon (SOC) cycle. Understanding the complex factors controlling SOC stocks and turnover is essential for projecting future SOC storage. In this study, we examined the influence of physico-chemical soil properties and climate on SOC stocks and radiocarbon (14C)-derived turnover times in various SOC fractions across 54 forest soils in Switzerland (0-20 cm depth), spanning diverse forest ecosystems and geo-climatic conditions (e.g., mean annual temperature, MAT, ranging from 1 to 12°C). Soil pH emerged as the dominant predictor for SOC turnover times for all fractions, exhibiting a parabolic relationship with a tipping point at a pH around 5.5 and longer turnover times at both low and high pH values. This is likely related to the high contents of pedogenic oxides observed in acidic soils and exchangeable calcium at high pH, both of which are known to stabilise SOC. Reduced soil biotic activity at low pH may additionally contribute to the observed pH effects. Accordingly, SOC persistence appears lowest in moderately acidic soils (pH 5–6.5). Particulate organic matter (POM) fractions were particularly sensitive to climate, with the organic layer being the most responsive SOC pool, exhibiting increased C stocks and turnover times at lower MAT. In mineral soils, soil water availability played a more pronounced role than MAT in controlling SOC stocks and turnover times, particularly in the occluded light fraction and the fine heavy fraction (fHF). Oxidation of the fHF with peroxide revealed that mineral-associated organic matter consists of two distinct sub-pools: a larger oxidized fraction with turnover times of 170±29 years, and a residual pool exhibiting turnover times on millennial timescales. These sub-pools exhibited distinct relationships with climate and soil properties. While turnover times of the oxidisable pool within the fHF increased significantly with soil water availability, residual organic matter in fHF remained insensitive to climate. Finally, relationships between climate and turnover times were mostly non-linear. Soils at the wetter and colder extremes of Swiss forest ecosystems (MAT<4°C) exhibited particularly large POM stocks and long turnover times – for example, up to 166 years in the organic layer at treeline. These ‘extreme’ soils with large POM stocks are likely particularly sensitive to climate change, as rising temperatures and hydrological changes may disproportionally impact C stored in POM.

373. 题目: Long‑term responses of greenhouse gas emissions and soil organic carbon to maize cropping system and tillage intensity
文章编号: N26081216
期刊: Soil and Tillage Research
作者: Lagomarsino Alessandra, Fantappiè Maria, Becagli Claudia, Rocchi Filippo, Rispoli Stefano, Lozano Fondón Carlos, Moretti Giorgio, Bianchetto Elisa, Pastorelli Roberta
更新时间: 2026-08-12
摘要: Maize cropping systems contribute substantially to agricultural greenhouse gas (GHG) emissions, and long-term evidence is required to assess trade-offs between soil carbon (C) sequestration, gaseous losses, and crop productivity. Using a long-term experiment (LTE) established in 1994 in Central Italy, this study evaluated in 2022 and 2024 the effects of cropping system (continuous maize vs. a 3-year maize–winter wheat–faba bean rotation) and tillage intensity, comparing deep ploughing (DP), disk harrowing (DH) and ripper subsoiling (RS) on CO₂, N₂O and CH₄ fluxes, soil organic carbon (SOC) and nitrogen (N) pools, maize yield and microbial communities.

374. 题目: Synchronous gelation and lanthanum doping with biochar/sodium alginate as the matrix for efficient phosphate removal from water: Adsorption performance and mechanism study
文章编号: N26081215
期刊: Separation and Purification Technology
作者: Qin Zhang, Rong Luo, Yvqing Lu, Ruqin Xiong, Lei Wang, Bingde Wu, Jiamei Li, Xiangjun Yang, Shengjian Li
更新时间: 2026-08-12
摘要: In this work, lanthanum (La) was adopted as a cross-linking agent to anchor biochar (BC) on a sodium alginate (SA) matrix, and BC/SA composite hydrogel beads (BS) were successfully fabricated. The cross-linking reaction between La(III) ions and SA synchronously promotes the gelation of the composite system and the introduction of La active sites, which imparts the BS composites with superior phosphorus removal capability and convenient solid-liquid separation performance. By optimizing the dosages of BC and SA, the phosphorus adsorption capacity of BS was remarkably improved. The B0.5S4 fabricated with 0.5 g BC and 4 g SA exhibited the optimal phosphorus removal performance. The B0.5S4 possesses a maximum phosphorus adsorption capacity of 75.0 mg P/g and can reach adsorption equilibrium rapidly within 10 min. Experimental results verify that coexisting ions exert negligible interference on the phosphorus removal performance of B0.5S4, and the material exhibits excellent phosphorous removal efficiency in natural water. In addition, B0.5S4 maintains stable and efficient phosphorus removal performance across a broad initial pH range of 5.0–11.0. After five adsorption-desorption cycles, the phosphorus removal efficiency of B0.5S4 remains above 70%, demonstrating its favorable reusability and operational stability. The dominant phosphorus removal mechanisms are identified as electrostatic interaction, surface complexation, and ligand exchange. In addition, B0.5S4 can effectively inhibit the reproduction of Staphylococcus aureus, and it has the dual functions of phosphorus removal and antibacterial action.

375. 题目: Chemical composition of sedimentary organic carbon differs significantly between the intact and restored mangroves in the Philippines
文章编号: N26081214
期刊: Organic Geochemistry
作者: R Ray, M Kida, R Suwa, T Miyajima, Charissa M Ferrera, Rene Rollon, Yasmin H Primavera-Tirol, Maria Lourdes San Diego-McGlone, Kazuo Nadaoka
更新时间: 2026-08-12
摘要: Mangroves store a large amount of organic carbon (OC) within the sediment to a depth of a meter or beyond. Nevertheless, little information is available about the difference in chemical composition of sedimentary OC in young restored versus old intact forests. To understand such pattern of changes in molecular composition of OC according to mangrove development, we conducted a detailed study at two contrasting settings on the Panay Island, the Philippines, where sediment properties were examined by applying advanced measurement tools (e.g.1H nuclear magnetic resonance spectroscopy and C and N stable isotopes), in addition to biomass and water quality data. Organic carbon was preserved in greater proportion with mangrove development (6 months to 40 years old) as indicated by its higher ratio to specific surface area (OC/SSA, 61 to 143 μmol C m−2) and stock estimates (from young to old as above-ground biomass: 27 to 568 Mg dry matter ha−1, below-ground biomass: 14 to 309 Mg dry matter ha−1, sediment: 28 to 77 Mg C ha−1 between 0 cm and 50 cm depth). Chemical differences between alkali-extractable OC samples were visible in the chemical shift regions of 1H NMR, as we found a distinct separation of sediment from the old to the young sites. The relative abundances of the % olefinic H and % carbohydrate H were higher in the sediment of old mature stands than the young, restored sites, where % aliphatic H and % functionalized aliphatic H dominated. The composition of alkali-extractable OC was determined mainly by the forest age, sediment depth and decomposition of mangrove-derived OC input. Finally, this work provides important baseline information for future projection of sediment maturity level after plantation in the studied mangrove forest.

376. 题目: Coupling of sulfate Isotopes with 3D-EEM: Unveiling a New Approach to Tracing the Origin of sulfates in Groundwater Around Landfills
文章编号: N26081213
期刊: Journal of Hazardous Materials
作者: xin Gao, jie Tang, Mingtan Zhu, xin Liu, yongchang Zhang, bing yu Zhou, tianlie Luo, tianyu He, Liu Guo
更新时间: 2026-08-12
摘要: Elevated sulfate concentrations in groundwater pose risks to drinking water safety and subsurface stability; however, accurate source apportionment remains challenging in systems influenced by mixed natural and anthropogenic inputs. This study examines a landfill-impacted aquifer in the red-bed region of southwestern Sichuan, China, with particular emphasis on the coupling between dissolved organic matter (DOM) and sulfate biogeochemical processes. A multi-tracer approach integrating hydrochemical analysis, sulphur (δ³⁴S) and oxygen (δ¹⁸O) isotopes, and three-dimensional excitation–emission matrix spectroscopy (3D-EEM) was employed. Groundwater evolution is primarily characterized by Ca²⁺ and SO₄²⁻, with hydrochemical facies transitioning from HCO₃–Ca to SO₄–Ca under landfill influence. sulfate sources display pronounced seasonal variability, with atmospheric deposition dominating in the wet season (46%) and landfill leachate in the dry season (36%). Distinct differences in DOM composition are observed among sources: landfill-affected groundwater is enriched in humic- and fulvic-like substances, where the humification index (HIX) is positively correlated with SO₄²⁻ concentrations and δ³⁴S values, whereas the biological index (BIX) shows a negative correlation. In contrast, groundwater influenced by gypsum dissolution is characterized by protein-like DOM, accounting for 76–88% of total DOM. By incorporating DOM fluorescence indices (HIX and BIX) as continuous covariates into a dual-isotope Bayesian mixing model (MixSIAR), dynamic source apportionment is achieved. This integration enhances source discrimination by explicitly accounting for DOM-mediated biogeochemical processes, providing a robust framework for tracing sulfate contamination in landfill-impacted groundwater systems.

377. 题目: Enhanced soil organic carbon sequestration due to long term straw incorporation in Northeast China's paddy soils: Insights from soil profile fertility and aggregate stability
文章编号: N26081212
期刊: Journal of Environmental Management
作者: Yanmei Dong, Yong Jing, Ying Liu, Haoxin Zhang, Shengyue Yu, Owen Fenton, Wenxuan Shi, Xinzhong Du, Miaoying An, Bingqian Fan, Hongbin Liu
更新时间: 2026-08-12
摘要: Straw incorporation is widely recognized as a crucial agricultural practice for improving soil fertility and enhancing soil organic carbon (SOC). However, its long-term effects on soil structural properties and carbon (C) sequestration in the paddy soils of Northeast China (NE-China) remain insufficiently characterized. The present study identified and examined the plough layer and pan across 75 paddy fields which had received no straw incorporation (SR0, 38 soil samplings); continuous straw incorporation for 3 years (SR3, 21 soil samples) or continuous straw incorporation for 5 to 8 years (SR5-8, 16 soil samples). Soil samples were also taken from these soil depths and analyzed for water-stable aggregates (WSA), and aggregate-associated organic carbon (OC) sequestration. Results showed that the SR5-8 treatment increased the plough layer thickness by 8.9 %, decreased plough pan thickness by 14.9 % and significantly reduced the bulk density by 7.4 % with respect to the SR0 treatment. In addition, SOC, total nitrogen (TN), and magnesium (Mg2+) contents in plough layer increased significantly by 25.7 %, 27.9 % and 47.1 %, respectively, in the SR5-8 treatment relative to the SR0 treatment. It was found that soil macroaggregates (>2 mm) played a dominant role in SOC sequestration. In comparison to SR0, the SOC in macroaggregates increased by 25.9 % under SR3 and 111.5 % under SR5-8. Moreover, a significant positive correlation was observed between macroaggregate-associated C and aggregate stability. Partial least squares path modeling showed that straw incorporation enhances aggregate stability by increasing soil nutrients and exchangeable base cations, which strengthens the protective function of macroaggregates in SOC stabilization, ultimately promoting greater SOC sequestration. These findings highlight the importance of increasing the aggregate stability and SOC sequestration with straw incorporation in paddy fields in NE-China.

378. 题目: Hierarchical structure and phosphorus fractionation co-regulate slow-release of biochar fertilizers with predictive modeling
文章编号: N26081211
期刊: Journal of Environmental Chemical Engineering
作者: Qiuyu Chen, Minquan Feng, Fei Tian
更新时间: 2026-08-12
摘要: Low utilization efficiency of phosphorus fertilizers and uncontrolled nutrient release have become major obstacles to sustainable agriculture. Biochar-based slow-release fertilizers (BSRFs) represent a promising biomass-derived solution, but the regulation mechanism remains unclear, and release behavior often mismatches plant demand. Apple wood biomass, bentonite, and potassium phosphate were used to prepare BSRFs via co-pyrolysis in this study. At 550 °C with 10% bentonite and 10 °C/min heating rate, BSRFs exhibited a well-developed honeycomb-like mesoporous structure and abundant -OH and CO groups. Phosphorus fractionation was regulated to balanced proportions of NaHCO₃-P, NaOH-P, and HCl-P, enabling stepwise release suitable for continuous nutrient supply. Approximately 65% cumulative phosphorus release of BSRFs was achieved over 42 d, and the phosphorus release followed Fickian diffusion and dissolution–diffusion mechanisms. A prediction model was established using the Box-Behnken design, and its predictive capability for soil conditions was validated by a strong linear correlation between water-based and soil-based release rates. By inversely optimizing parameters via the model, BSRFs matching the phosphorus demand of Chinese cabbage during the rosette and heading stages were customized. A preliminary field demonstration showed that the optimized BSRFs were associated with enhanced cabbage biomass, soluble sugar, soluble protein, and chlorophyll content, while markedly increasing soil available phosphorus and organic matter. This study clarifies the synergistic mechanism of hierarchical structure and phosphorus fractionation in controlling slow-release performance, and provides a predictive model for demand-driven design of BSRFs. These findings support the high-value utilization of biomass resources and the development of green, efficient, and targeted fertilizers.

379. 题目: Mechanistic insights into glyphosate adsorption and desorption in vineyard soils: Role of organic matter and iron and aluminum oxides
文章编号: N26081210
期刊: Environmental Research
作者: Manuel Conde-Cid, Paula Paíga, Cristina Delerue-Matos
更新时间: 2026-08-12
摘要: Glyphosate is the most widely used herbicide worldwide and is extensively applied in vineyard systems, where its environmental behavior is largely governed by soil adsorption-desorption processes. To investigate the mechanisms controlling glyphosate retention in vineyard soils, adsorption and desorption experiments were conducted on 18 vineyard soils from the northwestern Iberian Peninsula with contrasting physicochemical properties. Organic matter removal and phosphate pre-saturation experiments were additionally performed on three representative soils to elucidate sorption mechanisms.

380. 题目: Acidogenic fermentation of thermally hydrolyzed organic matter recovered from residual municipal waste: process performance and insights from batch and semi-continuous operation
文章编号: N26081209
期刊: Bioresource Technology
作者: A Muñoz-Muñoz, J J Hernandez-Garcia, A Sarrion, E Diaz, A F Mohedano, M A de la Rubia
更新时间: 2026-08-12
摘要: To enhance energy and material recovery from complex residual municipal wastes, the post-treated thermally hydrolyzed mechanically sorted organic fraction (PHSW) was evaluated through thermophilic acidogenic fermentation. Using a sequential approach, batch tests first assessed the influence of inoculum source and substrate-to-inoculum ratio on fermentative performance. Stabilized mixed sludge outperformed digested sewage sludge, increasing biohydrogen production by 46%, associated with a higher microbial diversity (Shannon index: 5.489) that favored complementarity between hydrolytic and acidogenic taxa. Despite thermal pretreatment, substrate conversion remained limited, with hydrolysis efficiencies ranging from 8% to 26%. Subsequently, semi-continuous stirred tank reactors were operated at 55 °C under different hydraulic retention times (HRT: 3, 5, and 8 days) to evaluate process performance. The highest specific hydrogen production rate was obtained at HRT of 3 days, reaching 19.6 mL H2·g−1 volatile solids·d−1 and a volatile fatty acids productivity of 3.31 g chemical oxygen demand·L−1·d−1, with butyrate as the predominant metabolite. Microbial analysis revealed a community shift from hydrogen-producers acidogens toward a syntrophic consortium, which was associated with the emergence of hydrogenotrophic methanogenic activity under mildly acidic conditions (pH 5.5–6.5). These findings highlight the potential of PHSW valorization through thermophilic acidogenic fermentation, supporting the transition toward a circular biorefinery model.