Environmental Technology & Innovation最新文献_第8页

Efficient microalgae harvesting: Synergistic flocculation and flotation with polyacrylamide and graphite electrolysis 高效微藻收获：聚丙烯酰胺和石墨电解协同絮凝和浮选

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-22 DOI: 10.1016/j.eti.2025.104281

Xuexia Zhu , Tianchi Yin , Lei Yin , Xuanhe Jia , Jun Wang

{"title":"Efficient microalgae harvesting: Synergistic flocculation and flotation with polyacrylamide and graphite electrolysis","authors":"Xuexia Zhu , Tianchi Yin , Lei Yin , Xuanhe Jia , Jun Wang","doi":"10.1016/j.eti.2025.104281","DOIUrl":"10.1016/j.eti.2025.104281","url":null,"abstract":"<div><div>Microalgae offer widespread applications, yet their harvesting remains challenging due to the limitations of conventional methods like centrifugation, filtration, and chemical flocculation, which often involve high energy costs, complex equipment, or environmental risks. This study investigated the efficiency of combining polyacrylamide (PAM) flocculation with electro-flotation to harvest <em>Chlorella vulgaris</em>, a widely cultivated microalgal species for biofuel production. The results demonstrated that PAM-electro-flotation significantly improved harvesting rates while reducing costs, with a PAM concentration of 5–10 mg L<sup>–1</sup> and electrolysis at 30 A m<sup>–2</sup> for 60 to 120 seconds being the most effective and energy-saving combination. At 10 mg L<sup>–1</sup> PAM concentration, a 95 % harvesting rate only needed 7.24 × 10<sup>–5</sup> kWh L<sup>–1</sup>, while nearly 100 % efficiency required around 4.97 × 10<sup>–4</sup> kWh L<sup>–1</sup>. During electrolysis, phosphate concentrations decreased, and dissolved oxygen levels increased, supporting its potential for wastewater treatment. The method, utilizing nontoxic PAM and graphite electrodes, didn’t significantly affect microalgae photosynthetic efficiency (QY-24h > 0.65), especially at low PAM levels (≤5 mg L<sup>–1</sup>) and current densities (≤20 A m<sup>–2</sup>). Our study develops a PAM-electro-flotation system with optimal parameters, proving to be an efficient, environmentally friendly, cost-effective, and microalgae-safe method for microalgae harvesting.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104281"},"PeriodicalIF":6.7,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recovery phosphorus and water resources from corn deep-processing wastewater using a combined process of forward osmosis and hydroxyapatite 正渗透-羟基磷灰石联合工艺回收玉米深加工废水中的磷和水资源

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-20 DOI: 10.1016/j.eti.2025.104277

Liguo Wan , Shan Yun , Lijun Zhang , Bao-Shan Xing , Benyi Xiao , Junfeng Zhai , Yu-You Li

{"title":"Recovery phosphorus and water resources from corn deep-processing wastewater using a combined process of forward osmosis and hydroxyapatite","authors":"Liguo Wan , Shan Yun , Lijun Zhang , Bao-Shan Xing , Benyi Xiao , Junfeng Zhai , Yu-You Li","doi":"10.1016/j.eti.2025.104277","DOIUrl":"10.1016/j.eti.2025.104277","url":null,"abstract":"<div><div>The global scarcity of phosphorus and water resources has become a pressing environmental issue, prompting extensive research into resource recovery strategies. Wastewater generated from corn starch processing exhibits high chemical oxygen demand (COD) and elevated concentrations of nitrogen and phosphorus, and is typically treated using combined anaerobic-aerobic processes. However, effluent from secondary biological treatment still contains considerable phosphorus, with PO<sub>4</sub><sup>3-</sup>-P concentrations exceeding 70 mg/L. Consequently, implementing water and phosphorus recovery processes as an alternative to conventional chemical removal methods aligns with circular economy principles and supports sustainable development goals. This study investigated the feasibility of recovering phosphorus and water from the effluent of secondary sedimentation tanks in corn starch processing wastewater using a forward osmosis-hydroxyapatite (FO-HAP) combined process and optimized the operational parameters. In the FO unit, the phosphorus concentration increased 5.9-fold compared to the feed water, reaching a PO<sub>4</sub><sup>3-</sup>-P level of 210.2 mg/L, with a water recovery rate of 80 %. In the HAP-induced crystallization unit, phosphorus removal efficiency reached 98 %, and the purity of the synthesized HAP was 75 % under optimal conditions (stirring intensity of 200 rpm, pH of 10, Ca/P molar ratio of 3). Overall, the FO-HAP combined process provides an effective approach for recovering phosphorus and water from secondary effluent in corn starch processing, offering both a practical technical solution and a theoretical basis for wastewater treatment and resource utilization in the industry.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104277"},"PeriodicalIF":6.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PMF model combined with stable isotope technology to track heavy metals accumulated in farmland soils PMF模型结合稳定同位素技术跟踪农田土壤重金属积累

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-20 DOI: 10.1016/j.eti.2025.104282

Xufeng Zhang , Shaohua Feng , Liwei Wang , Yunze Gao , Jinsong Liu , Tingting Shang , Ningzheng Zhu , Xiang-Zhou Meng

{"title":"PMF model combined with stable isotope technology to track heavy metals accumulated in farmland soils","authors":"Xufeng Zhang , Shaohua Feng , Liwei Wang , Yunze Gao , Jinsong Liu , Tingting Shang , Ningzheng Zhu , Xiang-Zhou Meng","doi":"10.1016/j.eti.2025.104282","DOIUrl":"10.1016/j.eti.2025.104282","url":null,"abstract":"<div><div>Source apportionment of heavy metals in farmland soils is necessary to ensure the safety of agricultural products. However, the source apportionment methods have not been effectively evaluated. Here, we took a polluted farmland in Jiaxing city, a typical plain river network area located in the Yangtze River Delta of China, as an example, and developed positive matrix factorization (PMF) model and stable isotope technology (SIT) to identify the sources of heavy metals. The concentrations of Cu, Ni, Cr, Zn, Pb, Cd, As, and Hg in cultivated layer soils were 19.0–38.0, 24.0–48.0, 49.0–71.0, 55.0–85.0, 21.8–51.1, 0.01–0.16, 4.45–11.3, and 0.09–0.68 mg/kg, respectively. Hg exceeded the risk screening value with an exceeding rate of 12.5 %. Heavy metals in farmland soils originated from industrial production (32.0 %), natural source (28.2 %), agricultural activity (25.8 %) and vehicle emission (14.0 %). However, for Hg, only industrial production (37.1 %) and agricultural activity (62.9 %) were identified, and the contributions of natural source and vehicle emission were not obtained from PMF. Hg stable isotope ratios can compensate for the incompleteness of PMF, with agricultural activity contributing the most (51.6 %), followed by natural source (20.9 %), industrial production (15.4 %) and vehicle emission (12.1 %). 79.1 % of Hg was affected by external inputs with agricultural activity accounting for 65.2 %, which was supported by the input of Hg from potential sources (agricultural activity 65.0 %). PMF may have limitation in the source apportionment of specific heavy metal, and the combined application of SIT can solve the limitation.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104282"},"PeriodicalIF":6.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combined effects of Cd and Cr pollution on Eisenia fetida: Influence of soil texture and toxicological mechanisms 镉和铬污染对臭Eisenia fetida的联合效应：土壤质地的影响及毒理机制

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-20 DOI: 10.1016/j.eti.2025.104278

Ruogu Zeng , Daixi Zhang , Jiajun Li , Shirong Zhang , Guiyin Wang , Xiaoxun Xu , Ting Li , Xiaomei Pan , Yongxia Jia , Yulin Pu , Wei Zhou

{"title":"Combined effects of Cd and Cr pollution on Eisenia fetida: Influence of soil texture and toxicological mechanisms","authors":"Ruogu Zeng , Daixi Zhang , Jiajun Li , Shirong Zhang , Guiyin Wang , Xiaoxun Xu , Ting Li , Xiaomei Pan , Yongxia Jia , Yulin Pu , Wei Zhou","doi":"10.1016/j.eti.2025.104278","DOIUrl":"10.1016/j.eti.2025.104278","url":null,"abstract":"<div><div>Soil heavy metal co-contamination poses a global threat to soil ecosystems, yet the texture-dependent interactions between cadmium (Cd) and chromium (Cr) in earthworm toxicity remain poorly quantified. This study integrates quadratic saturated D-optimal design with ecotoxicological assays to unravel how soil texture modulates Cd<sup>2 +</sup>-Cr<sup>6+</sup> synergistic effects on <em>Eisenia fetida</em>. Median lethal concentrations (LC<sub>50</sub>) of Cd<sup>2+</sup> in loam and loamy-clay soils increased by 69.4 and 87.5 % compared to sandy soil, while Cr<sup>6+</sup> LC<sub>50</sub> values rose by 49.7 and 56.4 %, respectively. Growth inhibition rates (GIR) under combined pollution reached 77.9, 70.8, and 25.3 % in sandy, loam, and loamy-clay soils, respectively, inversely correlating with clay content (<em>p</em> < 0.05). Synergistic Cd<sup>2+</sup>-Cr<sup>6+</sup> interactions dominated in low-clay soils, whereas clay-mediated adsorption attenuated toxicity via electrostatic binding, SEM-EDS analysis revealed significant differences in Cd and Cr distribution in earthworms among the three soils. GIR or biomarkers demonstrated significantly positive correlation with Cd<sup>2+</sup> or Cr<sup>6+</sup> concentration, and negative with clay content. This study establishes a quantitative framework linking soil texture to Cd/Cr bioavailability, offering critical guidance for region-specific ecological risk assessment.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104278"},"PeriodicalIF":6.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrokinetic transport mechanisms of rare earth elements in ion-adsorption deposits: An integrated model approach 离子吸附矿床中稀土元素的电动力学输运机制：一个综合模型方法

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-19 DOI: 10.1016/j.eti.2025.104276

Jie Xu , Gaofeng Wang , Bowen Ling , Shichang Kang , Yongqiang Yang , Xiaoliang Liang , Jingming Wei , Yongjin Xu , Jianxi Zhu , Hongping He

{"title":"Electrokinetic transport mechanisms of rare earth elements in ion-adsorption deposits: An integrated model approach","authors":"Jie Xu , Gaofeng Wang , Bowen Ling , Shichang Kang , Yongqiang Yang , Xiaoliang Liang , Jingming Wei , Yongjin Xu , Jianxi Zhu , Hongping He","doi":"10.1016/j.eti.2025.104276","DOIUrl":"10.1016/j.eti.2025.104276","url":null,"abstract":"<div><div>Heavy rare earth elements (REEs) are critical strategic resources for advanced technologies and the low-carbon economy transition. Ion-adsorption deposits (IADs) represent the primary sources of heavy REEs, yet their mining has caused severe environmental impacts. Electrokinetic mining (EKM), a sustainable alternative, promises efficient REE recovery from IADs. However, the electrokinetic transport mechanisms of REEs in IADs remain unclear, and predictive models are lacking. Here, we develop an integrated EKM (IEKM) model that rigorously incorporates coupled effects of diffusion, convection, electromigration, electroosmosis, and electrolysis to resolve REE transport in IADs. The IEKM model was validated using a 14-ton-scale IAD EKM, accurately simulating REE and leaching agent (NH₄⁺) ion transport. The predicted REE recovery efficiency is 80.97 % after 11 days of EKM, aligning with experimental results (88.28 ± 17.00 %). Significantly, the IEKM model quantitatively determines that diffusion, convection, electromigration, electroosmosis, and electrolysis contribute 3.06 %, 2.90 %, 82.91 %, 0.20 %, and 10.93 %, respectively, to REE transport. Unexpectedly, electromigration emerges as the dominant mechanism governing REE electrokinetic transport in IADs with significant influence by electrolysis, while electroosmosis exhibits negligible contribution, contradicting conventional expectations. Furthermore, electrolysis consumed 57.95 % of input energy due to water splitting, leaving only 42.05 % for direct REE transport. This work advances fundamental understanding of REE electrokinetic transport in IADs and establishes an industrially viable model, bridging experimental and numerical modeling to facilitate practical applications of environmentally sustainable EKM technology in resource recovery.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104276"},"PeriodicalIF":6.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

State of the art on fungal biodegradation of persistent organic pollutants in soils and innovative strategies for isolating relevant candidate strains 土壤中持久性有机污染物的真菌生物降解研究现状及分离相关候选菌株的创新策略

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-16 DOI: 10.1016/j.eti.2025.104247

Charbel Elias , Stéphane Ranque , Laure Malleret

{"title":"State of the art on fungal biodegradation of persistent organic pollutants in soils and innovative strategies for isolating relevant candidate strains","authors":"Charbel Elias , Stéphane Ranque , Laure Malleret","doi":"10.1016/j.eti.2025.104247","DOIUrl":"10.1016/j.eti.2025.104247","url":null,"abstract":"<div><div>The pollution by persistent organic pollutants (POPs) in terrestrial and soil ecosystems pose a significant global threat, due to their long-term stability, widespread dissemination and detrimental effects on human health and ecological systems. In recent years, myco-remediation has emerged as a sustainable and cost-effective restoration technology, offering several advantages over bacteria, given the omnipresence of fungi, their capacity to tolerate and survive harsh environmental conditions, as well as their ability to oxidize a broader range of compounds, particularly those with high molecular weight and increased recalcitrance. This review explores past and recent advancements in fungal bioremediation of soil contaminated with 19 persistent organic pollutants (POPs) listed under the Stockholm Convention, including ten from the original \"dirty dozen\" and nine of the newly registered POPs. Fungal species which had demonstrated POP degradation capabilities are delved and their advantages, limitations, and degradation pathways are assessed. A comprehensive review of fungal species applied for POP bioremediation is provided, highlighting the most frequently employed strains. The review also highlights the need of agreeing on standardized approaches, including criteria to select truly effective fungal remediation strains as well as appropriate initial POP concentrations. To guide future research, it provides also insights on innovative fungal isolation approaches, and explores advancements in characterization strategies, to uncover promising candidates for soil bioremediation. Innovations in myco-remediation hold great promise for effectively mitigating POPs in soil environments. This review highlights the growing importance of sustainable solutions for persistent organic pollutants management.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104247"},"PeriodicalIF":6.7,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile preparation of Z-scheme based graphene/TiO2/MnO2 hybrid nanomaterial: A dual application in hazardous dye and antibacterial reduction 基于Z-scheme的石墨烯/TiO2/MnO2杂化纳米材料的制备：在危险染料和抗菌还原中的双重应用

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-15 DOI: 10.1016/j.eti.2025.104262

Bhuvaneswari kandasamy , Pazhanivel Thangavelu , Sarun Phibanchon , Rotruedee Chotigawin , Taddao Pahasup-anan , Surachai Wongcharee , Ranjith Rajendran , Thammasak Rojviroon , Kowit Suwannahong

{"title":"Facile preparation of Z-scheme based graphene/TiO2/MnO2 hybrid nanomaterial: A dual application in hazardous dye and antibacterial reduction","authors":"Bhuvaneswari kandasamy , Pazhanivel Thangavelu , Sarun Phibanchon , Rotruedee Chotigawin , Taddao Pahasup-anan , Surachai Wongcharee , Ranjith Rajendran , Thammasak Rojviroon , Kowit Suwannahong","doi":"10.1016/j.eti.2025.104262","DOIUrl":"10.1016/j.eti.2025.104262","url":null,"abstract":"<div><div>This study explores the photocatalytic degradation efficacy of methylene blue (MB) dye, a prevalent water pollutant, employing graphene/TiO<sub>2</sub>/MnO<sub>2</sub> (GTM) hybrid photocatalyst. The photocatalytic degradation performance against MB dye revealed that the as-prepared GTM hybrid photocatalyst exhibited superior activity, achieving a degradation efficiency of 97 % within 40 min of UV–visible light irradiation. Notably, the GTM hybrid photocatalyst demonstrated a high-rate constant (k) of 0.174 min⁻¹ , surpassing that of the bare TiO<sub>2</sub> (k = 0.030 min⁻¹) and MnO<sub>2</sub> (k = 0.047 min⁻¹) photocatalysts. Cyclic stability tests up to ten cycles confirmed the excellent durability of the GTM hybrid photocatalyst, retaining 80 % of its initial activity. Hydroxyl and superoxide radicals play a significant role in the degradation process, while the heterojunction structure significantly enhances charge separation, further improving photocatalytic efficiency. The enhanced photocatalytic performance of the GTM hybrid can be attributed to the improved charge carrier separation, augmented surface area, and 2D/2D/1D heterojunction formation. Also, the antibacterial activity of the as-prepared photocatalyst was analyzed over <em>Klebsiella pneumoniae (KP)</em> and <em>Staphylococcus aureus (SA)</em> using the agar well diffusion method. The observed results show that the GTM has effective antibacterial activity against both microorganisms. This research contributes to developing sustainable materials and processes for environmental remediation, aligning with the principles of green chemistry and promoting a cleaner, healthier environment.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104262"},"PeriodicalIF":6.7,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancing bio-recycling of nylon monomers through CRISPR-assisted engineering 通过crispr辅助工程推进尼龙单体的生物循环利用

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-15 DOI: 10.1016/j.eti.2025.104267

Bahareh Arab , Jinjin Chen , Anna N. Khusnutdinova , C. Perry Chou , Yilan Liu

{"title":"Advancing bio-recycling of nylon monomers through CRISPR-assisted engineering","authors":"Bahareh Arab , Jinjin Chen , Anna N. Khusnutdinova , C. Perry Chou , Yilan Liu","doi":"10.1016/j.eti.2025.104267","DOIUrl":"10.1016/j.eti.2025.104267","url":null,"abstract":"<div><div>Plastic waste is a global environmental crisis, and nylon—a widely used polyamide—contributing significantly due to its extensive applications in textiles, automotive components, and packaging. Post-lifecycle degradation of nylon releases monomers like 1,6-hexamethylenediamine (HD) and 6-aminocaproic acid (ACA), which persist in ecosystems, posing toxicity and bioaccumulation risks. In this study, we employed a CRISPR-assisted directed evolution (CDE) to engineer <em>Pseudomonas putida</em> KT2440 for efficient utilization of HD as the sole nitrogen source, coupling its degradation to bacterial growth. Genomic and transcriptomic analyses prioritized potential enzymes involved in HD degradation. Using CRISPR interference (CRISPRi) and expert-guided screening, we identified three key enzymes including KgtP transporter, AlaC transaminase, and FrmA dehydrogenase that are critical to the KAF pathway. The functionality of these enzymes was confirmed in <em>P. putida</em> and further validated through heterologous expression in <em>Escherichia coli</em>. The CDE and growth-coupled strategy, together with the KAF pathway we discovered, is essential for our future efforts to engineer synthetic bacterial consortia capable of degrading mixed plastic monomers. In the long term, we envision integrating these consortia with synthetic biology tools to degrade complex plastic polymers and convert them into valuable chemicals, advancing circular economic efforts for sustainable plastic waste management and environmental protection.</div></div><div><h3>Synopsis</h3><div>CRISPR systems engineered <em>Pseudomonas putida</em> for efficient nylon monomer degradation, unveiling a novel pathway and advancing plastic waste recycling and environmental mitigation strategies.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104267"},"PeriodicalIF":6.7,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The impact of functional membrane covering on nitrogen and sulfur transformation of sludge composting and its microbial action mechanism 功能膜覆盖对污泥堆肥中氮硫转化的影响及其微生物作用机理

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-15 DOI: 10.1016/j.eti.2025.104266

Rongrong Li , Rui Cai

{"title":"The impact of functional membrane covering on nitrogen and sulfur transformation of sludge composting and its microbial action mechanism","authors":"Rongrong Li , Rui Cai","doi":"10.1016/j.eti.2025.104266","DOIUrl":"10.1016/j.eti.2025.104266","url":null,"abstract":"<div><div>Nitrogen and sulfur are essential nutrients for promoting plant growth. Investigating the transformation mechanisms of nitrogen and sulfur during composting has substantial guiding significance for enhancing the fertility of composting products. Functional membrane-covered aerobic composting systems have consistently demonstrated their ability to accelerate compost maturation. However, the transformation mechanisms of nitrogen and sulfur within this system, as well as the associated microbial processes, remain inadequately understood. In this study, the impact of functional membrane coverage (FM) on the transformation of nitrogen and sulfur compounds during sludge composting was studied, along with an investigation into the microbial mechanisms underlying nitrogen and sulfur cycling. The results showed that nitrite ammonification, nitrite oxidation, and nitrate reduction were the main nitrogen transformation steps during the early days of composting. In the middle and later stages, the denitrification intensified, leading to a decrease in available nitrogen content. Sulfate reduction, sulfide oxidation, and thiosulfate dispropotionation constituted the primary sulfur transformation steps, with thiosulfate oxidation intensity gradually increasing. FM inhibited denitrification, sulfite reduction, and thiosulfate dispropotionation, thereby reducing nitrogen and sulfur loss by 14.1 % and 8.1 %, respectively, and increasing available nitrogen and available sulfur content by 14.9 % and 9.6 %, respectively. The main participants involved in nitrogen cycle were <em>Nitrospira</em>, <em>Luteimonas</em>, <em>Streptomyces</em>, <em>Pseudoxanthomonas</em>, <em>Actinomadura</em>, and <em>Pseudomonas.</em> A wide variety of functional microorganisms were involved in the sulfur cycle, with their succession during composting being especially prominent. In summary, the FM system can serve as an effective approach to enhance the fertility of sludge compost products.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104266"},"PeriodicalIF":6.7,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainable nexus for treating acid mine drainage: How does bio-alkali matrix impact acidity neutralization and heavy metal removal? 处理酸性矿山废水的可持续关系：生物碱基质如何影响酸性中和和重金属去除？

IF 6.7 2区环境科学与生态学

Environmental Technology & Innovation Pub Date : 2025-05-15 DOI: 10.1016/j.eti.2025.104272

Cong Peng , Li Zeng , Yonghong Liu , Zhenyu Zhang , Jiayi Tang , Zhenghua Liu , Zhaoyue Yang , Huaqun Yin , I.A. Ibrahim , Ke Zhang , Zhendong Yang

{"title":"Sustainable nexus for treating acid mine drainage: How does bio-alkali matrix impact acidity neutralization and heavy metal removal?","authors":"Cong Peng , Li Zeng , Yonghong Liu , Zhenyu Zhang , Jiayi Tang , Zhenghua Liu , Zhaoyue Yang , Huaqun Yin , I.A. Ibrahim , Ke Zhang , Zhendong Yang","doi":"10.1016/j.eti.2025.104272","DOIUrl":"10.1016/j.eti.2025.104272","url":null,"abstract":"<div><div>Acid mine drainage (AMD), characterized by high acidity and elevated concentrations of heavy metals, poses a persistent threat to ecological systems. Conventional neutralizers (NaOH, Na<sub>2</sub>CO<sub>3</sub>, Ca(OH)<sub>2</sub>) raise pH effectively but generate large sludge volumes and incur high operating costs. Here, three urease-positive microbial consortia, enriched from soil and municipal activated sludge, were cultivated with urea to produce bio-alkali matrices (BAM-A/B/C, final pH 9.3). Abundant –CONH<sub>2</sub>, –NH<sub>2</sub>, –OH, and –COOH groups capable of chelating metal ions were found in BAM, suggesting alkaline buffering is complemented by ligand-mediated metal sequestration. When each BAM was mixed with AMD at a 3:10 vol ratio, the effluent pH stabilized at 7 and removal efficiencies reached ∼100 % for Al, Fe, Cr, Cd; > 90 % for As, V, Co, Ni; 79–80 % for Cu; and 60 – 62 % for Mn. Geochemical analysis identified Fe/Al hydroxysulfates and organo-metal complexes as dominant precipitates. A full cost comparison showed BAM-A lowered treatment expenses to 35.5 RMB per m<sup>3</sup>, which is 12 % below NaOH and 26 % below Ca(OH)<sub>2</sub>, while reducing sludge generation. Coupling BAM with sulfate-reducing bacterial systems is advisable to enhance Mn and SO<sub>4</sub><sup>2-</sup> removal. Overall, BAM provides an economical and environmentally sustainable alternative for AMD neutralization by uniting alkaline buffering with organic complexation.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104272"},"PeriodicalIF":6.7,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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