Environmental Technology最新文献

{"title":"Enhanced deep-dewatering of high EPS-Containing sludge waste using PDMDAAC-PFS and H₂O₂.","authors":"Yong-Tao Lv, Jiaxin Liu, Kangning Ren, Junqi Qiu, Jianfeng Dai, Danxi Huang, Lei Wang","doi":"10.1080/09593330.2025.2507390","DOIUrl":"https://doi.org/10.1080/09593330.2025.2507390","url":null,"abstract":"<p><p>Large quantities of sludge from wastewater treatment plants require dewatering before final disposal, with extracellular polymeric substance (EPS) significantly impacting sludge dewatering performance. This study achieved deep-dewatering of sludge with high EPS content (164.36-181.62 mg/g VSS) by reducing moisture content to 57.2% using a combination of polydimethyldiallylammonium chloride-ferric sulphate (PDMDAAC-PFS) and hydrogen peroxide (H₂O₂). Using PDMDAAC-PFS alone decreased tightly bound EPS (TB-EPS) from 152.7 to 135.3 mg/g VSS while increasing EPS by 77.2%, indicating that the reagent solubilised TB-EPS and disrupted the cell wall, releasing intracellular bound water. Further addition of H₂O₂ reduced total EPS by 34.2-55.1%, primarily affecting extracellular protein (PN) in TB-EPS. Three-dimensional fluorescence and Fourier transform infrared spectrometry revealed that the reduced PN in TB-EPS consisted mainly of tyrosine proteins, with the destruction of hydrophilic groups (amino group and carbonyl group) contributing to the release of bound water. Quenching tests demonstrated that hydroxyl radicals generated by H₂O₂ were crucial for EPS oxidation, contributing to 21.9% of sludge dewatering. Additionally, PDMDAAC-PFS re-flocculated the structurally damaged sludge into larger, more porous particles, enhancing the dewatering process. Thus, this study presents a novel method of deep-dewatering for waste sludge containing high EPS content.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-12"},"PeriodicalIF":2.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144149894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"A sludge volume index model based on components of extracellular polymeric substances during temperature decline.","authors":"Liying Liu, Ke Xu, Huimin Zhao","doi":"10.1080/09593330.2025.2508361","DOIUrl":"https://doi.org/10.1080/09593330.2025.2508361","url":null,"abstract":"<p><p><b>ABSTRACT</b>Sludge bulking remains a persistent challenge in wastewater treatment plants due to the hardness of its prediction. In this research, sludge bulking was simulated in a sequencing batch reactor (SBR) under stepwise cooling conditions to simulate the temperature fluctuations typically happening in the early winter period. The variations in the formulation and concentrations of extracellular polymeric substances (EPS) and the Sludge Volume Index (SVI) during progressive temperature decline were systematically recorded and analysed. Correlation analysis indicated a positive correlation between SVI and the concentrations of soluble microbial products (SMP), loosely bound EPS (LB-EPS), and tightly bound EPS (TB-EPS). A multiple linear regression (MLR) model was developed to predict SVI based on EPS components, explaining 54.6% of the variation in SVI (adjusted <i>R</i>² = 0.546) with statistical significance (<i>p</i> < 0.01). Model validation confirmed its reliability, demonstrating that the proposed model effectively captures the impact of EPS variations on SVI. This study underscores the critical role of specific EPS components on SVI, providing a responsible approach for real-time monitoring and prediction of sludge bulking during temperature declining in early winter.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-9"},"PeriodicalIF":2.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144149890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Isolation and characterization of a low-temperature and cellulose-degrading fungus <i>Tausonia pullulans</i> LC-6.","authors":"Xinyu Hao, Jianzheng Li, Jun Xia, Yiyang Fan, Furao Wang, Jia Meng","doi":"10.1080/09593330.2025.2508360","DOIUrl":"https://doi.org/10.1080/09593330.2025.2508360","url":null,"abstract":"<p><p>Agricultural residues are frequently utilized as biomass fertilizers via compost, but their degradation is hindered by low temperatures in cold regions. Isolating strains capable of degrading cellulose at low temperatures is crucial for the effective recycling of agricultural residues in cold regions. In this study, the strains with cellulose degrading ability were selected from humus soil in cold region. Preliminary screening was performed by sodium carboxymethyl cellulose culture and Congo red staining. Cellulase activity was rescreened and identified by morphological observation, physiological and biochemical tests, and phylogenetic analysis of Internal Transcribed Spacer sequence. We isolated and identified a cellulose-degrading strain (LC-6) operating at low temperature (10°C-15°C). It was identified as <i>Tausonia pullulans</i> (GenBank entry number PQ227816 and PQ584837). The strain exhibited peak activities of Carboxymethyl cellulase, Cellobiohydrolase, <i>β</i>-Glucosidase, and Filter paper enzyme at 4.93, 7.62, 14.17 and 7.15 U/mL, respectively. After 15-days fermentation at 15°C, the degradation rates of hemicellulose, cellulose and lignin of the strain were 25.01%, 16.13% and 24.35%, respectively. The findings indicated that strain LC-6 can effectively degrade straw at low temperatures, demonstrating significant potential for applications in the utilization of lignocellulosic biomass.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-10"},"PeriodicalIF":2.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144149896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Release mechanism of sustained-release persulfate materials based on stearic acid.","authors":"Junheng Kan, Quan Zhu, Qin Qiu, Hong Yang, Xueqiang Zhu","doi":"10.1080/09593330.2025.2507389","DOIUrl":"https://doi.org/10.1080/09593330.2025.2507389","url":null,"abstract":"<p><p>Polycyclic aromatic hydrocarbons (PAHs) in groundwater demonstrate poor degradability and wide contamination plumes. The widely utilized in-situ chemical oxidation technology can effectively oxidize and degrade PAHs in groundwater. However, conventional in-situ chemical oxidation for PAHs in groundwater faces challenges including rapid reaction of oxidants and potential rebound of pollutant concentrations. Therefore, there is a current need to develop novel sustained-release oxidants. This study developed persulfate release materials (PDS@SA) by blending sodium persulfate (PDS) with stearic acid (SA) at different mass ratios. Batch and column experiments were conducted to investigate the influence of mass ratio and particle size on the PDS release process. The results revealed that the mass ratio of PDS in PDS@SA was positively correlated with the cumulative release percentage of PDS, as well as the intermediate release rate and the final decomposition rate of PDS. The particle size of PDS@SA was directly proportional to the release lifespan of PDS, while inversely proportional to the total release amount of PDS. The release mechanisms was examined by Bhaskar and Rigter-Peppas models. The results were further validated by fitting with a dual boundary dissolution-diffusion model, which predicted the release lifespan of PDS@SA with different particle sizes with a PDS:SA ratio of 1:3. The prediction indicated that PDS@SA with particle sizes of 30 and 40 mm exhibited good sustained-release performance and significantly mitigated burst release effect. Compared to traditional methods of directly oxidizing organic matter in groundwater using activated persulfate, this study achieves enhanced controlled release and prolonged lifespan.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-13"},"PeriodicalIF":2.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144149901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Prediction of NO_x emissions from co-disposal of municipal solid waste and sludge using a GA-LSTM neural network.","authors":"Bo Qiu, Quan Yuan, Yadong Niu, Huangxing Mo, Chao Sun, Jiezhao Feng","doi":"10.1080/09593330.2025.2507386","DOIUrl":"https://doi.org/10.1080/09593330.2025.2507386","url":null,"abstract":"<p><p>Accurately predicting NO_x emissions is crucial for effectively controlling pollution during the incineration of municipal solid waste (MSW). This study focuses on the application of genetic algorithm (GA) and long short-term memory (LSTM) neural networks in modeling the relationship between operating parameters and NO_x emissions for an 850 t/d MSW incinerator. After data cleaning, principal component analysis (PCA) was used to eliminate correlations among input variables and GA was applied to optimize the hyperparameters of the LSTM model which was compiled with the Adam optimizer. Lastly, a NO_x emission trend prediction model with practical engineering value was proposed, specifically considering the co-incineration of sludge and waste. The model was thoroughly validated using both actual operational data from the waste incineration process and numerical simulation results. Analysis on prediction performance indicates that even the GA-LSTM model maintains a strong capability for predicting NO_x emissions for MSW incinerator, even when handling large amounts of high-dimensional data.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-18"},"PeriodicalIF":2.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144149898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Evaluation of mixed culture fungal strains for degradation of paraquat.","authors":"Alyne Vasconcelos Cavalcante, Victoria Maura Silva Bermúdez, João Pedro de Lima Alves Barbosa, Marcos Vinícius Freire Andrade, Glória Maria Marinho Silva, Kelly Rodrigues","doi":"10.1080/09593330.2025.2503491","DOIUrl":"https://doi.org/10.1080/09593330.2025.2503491","url":null,"abstract":"<p><p><b>ABSTRACT</b>The potential of fungal mixed culture CI (<i>Aspergillus niger</i> + <i>Phanerochaete chrysosporium</i>), CII (<i>Aspergillus niger</i> AN400 <i>+</i> <i>Trametes versicolor</i>), and CIII (<i>Phanerochaete chrysosporium</i> + <i>Trametes versicolor</i>) was evaluated for paraquat removal, along with the individual potential of each fungus. In plate growth tests, only <i>Trametes versicolor</i> showed inhibition by paraquat (MI: 94.4%, 10 mg·L^-1) and the growth of <i>Aspergillus niger</i> and <i>Phanerochaete chrysosporium</i> was not inhibited by the pesticide, with maximum growth rates (<i>K</i>_max) of 2.136 day^-1 (<i>R</i>²: 0.821) and 1.632 day^-1 (<i>R</i>²: 0.713) at 40 mg·L^-1, respectively. Mixed culture CI outperformed CII and CIII, with <i>K</i>_max of 2.784 day^-1 (<i>R</i>²: 0.798; 50 mg·L^-1) and 2.352 day^-1 (<i>R</i>²: 0.939; 10 mg·L^-1), respectively, by <i>Aspergillus niger</i> and <i>Phanerochaete chrysosporium</i>. In an aqueous medium using a batch reactor, CI achieved the highest paraquat removal rate of 42.2% ± 2 at 50 mg·L^-1 without the addition of glucose, whereas non- mixed culture forms required glucose (5 g·L^-1) to achieve removals of 39.3% ± 3 for <i>Aspergillus niger</i> and 36.5% ± 0.7 for <i>Phanerochaete chrysosporium</i>. The synergy between these species was further confirmed by a paraquat removal rate (<i>k</i>) of 0.081 day^-1 (<i>R</i>²: 0.944) and a half-life (t_1/2) of 9 days. In contrast, with glucose in the medium, <i>k</i> and t_1/2 were 0.032 day^-1 (<i>R</i>²: 0.927) and 22 days. Thus, mixed culture CI demonstrated superior performance, making it suitable for efficient pollutant removal in bioreactors without the need for a cosubstrate.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-13"},"PeriodicalIF":2.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144141773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Treatment of aniline wastewater with sponge iron/O₂: influencing factors and potential degradation mechanisms.","authors":"Huina Xie, Wei Zhao, Jing Li, Jie Li","doi":"10.1080/09593330.2025.2508944","DOIUrl":"https://doi.org/10.1080/09593330.2025.2508944","url":null,"abstract":"<p><p>Zero-valent iron (ZVI) serves not only as a reductive agent but also activates molecular oxygen to produce reactive oxygen species (ROS) for the oxidation of organic matter. This paper investigates the molecular oxygen activation with sponge iron (S-Fe) system and explores the key factors influencing ROS production. Response surface methodology (RSM) was employed to optimize the operating parameters to increase the production of ROS. Under the optimal conditions, the treatment effects and degradation pathway of aniline (AN) were investigated. It was confirmed that the quadratic equation model was accurate and reliable, the optimal operating parameters were obtained as follows: pH of 4, S-Fe dosage of 119 g/L, agitation speed of 114 rpm. The AN degradation process accords with zero-order reaction kinetics. Deamination occurs mainly at 36 h before the reaction, then the ring-opening rate of the benzene ring was greater than the deamination. A distinct iron corrosion product resembling Fe₂O₃, Fe₃O₄, and FeOOH formed on the surface of S-Fe. The S-Fe/O₂ system played a crucial role in AN degradation. These findings provide valuable insights for the further exploration and application of ZVI technology.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-11"},"PeriodicalIF":2.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144149927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Effects of ozonation sludge reduction on nutrient removal and microbial community diversity of conventional A²/O and reversed A²/O processes.","authors":"Junkun Feng, Shiyun Zhu, Shouqiang Huang, Yalin Yu, Nanwen Zhu, Amin Mojiri, Dongdong Ge","doi":"10.1080/09593330.2025.2506022","DOIUrl":"https://doi.org/10.1080/09593330.2025.2506022","url":null,"abstract":"<p><p>To optimise ozonation sludge reduction in the activated sludge process, it is crucial to monitor nutrient removal and pay particular attention to the influential biological species. This study employed high-throughput sequencing to examine the microbial composition and diversity in the anaerobic-anoxic-oxic (A²/O) process, the A²/O process with ozonation, and the reversed A²/O process with ozonation. The diversity analysis aimed to identify discrepancies and similarities in microbial communities among these groups, thereby elucidating the varying biological efficiencies. Furthermore, the results from Illumina MiSeq sequencing revealed significant diversification in microbial community structures in different processes. Ozonation sludge notably inhibited certain species, including the order <i>Bacteroidales</i> within the class <i>Bacteroidia</i>, as well as the orders <i>Rhizobiales</i> and <i>Rhodospirillales</i> within the class <i>Alphaproteobacteria</i>. Additionally, ozonation sludge exerted a notable impact on specific orders within the class <i>Gammaproteobacteria</i>, including <i>Aeromonadales</i>, <i>Chromatiales</i>, and <i>HOC36</i>. In contrast, it stimulated the proliferation of other microbial groups, such as <i>Lactobacillales</i>, <i>Clostridiales</i>, as well as <i>Burkholderiales</i> and <i>Rhodocyclales</i>. The inhibition and promotion of ozonation sludge in conventional and reversed A²/O processes resulted in various microbial richness and diversity, which rendered the distinctive biochemical activities and wastewater treatment performances. <i>Betaproteobacteria</i> increased significantly, especially in the reversed A²/O process, and <i>Betaproteobacteria</i> played an important role in the nitrogen removal and phosphorus removal process. These findings are useful for guiding the ozonised sludge system to reduce carbon, denitrification, and phosphorus removal to meet the emission standards, and the identification and enhancement of the construction of potential key biological flora for better wastewater treatment and sludge reduction.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-15"},"PeriodicalIF":2.2,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144126973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"A new method for synthesizing hydroxyapatite from eggshell and sludge and its calcination exploration.","authors":"Jian Li, Botao Wang, Ting Yu Zhang","doi":"10.1080/09593330.2025.2499972","DOIUrl":"https://doi.org/10.1080/09593330.2025.2499972","url":null,"abstract":"<p><p>This study presents a novel low-cost synthesis methodology for hydroxyapatite (HAP). HAP was successfully synthesized via a simplified chemical process utilizing eggshells as a calcium source and sludge as a phosphorus source. This approach not only addresses the dual challenges of eggshell and sludge disposal but also establishes an innovative pathway for sustainable and economically viable HAP production. The influence of calcination parameters (The optimal conditions are 600^oC for 3 h) on the microstructure of HAP was systematically investigated, revealing that optimized calcination conditions significantly enhance crystallinity and porosity. Comprehensive characterization of the synthesized HAP was performed using X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Post-calcination characterization revealed significant crystallographic refinement, accompanied by a 95% enhancement in Brunauer-Emmett-Teller (BET) surface area (57.23 m²/g) compared to precursor materials. Analytical results confirmed the high purity and exceptional physicochemical properties of the synthesized HAP, demonstrating substantial potential for applications in environmental remediation and biomedical engineering. This work advances a green and cost-effective strategy for HAP synthesis while pioneering a resource-efficient utilization route for waste-derived eggshells and sludge.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-10"},"PeriodicalIF":2.2,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144126964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Effect of coal-gangue derived calcium silicate hydrate on the growth of pakchoi in copper contaminated soil.","authors":"Zhang Qing, Zhang Hailong, Wang Lulu, Zhang Xianglin, Zhang Shizhen","doi":"10.1080/09593330.2025.2507388","DOIUrl":"https://doi.org/10.1080/09593330.2025.2507388","url":null,"abstract":"<p><p><b>ABSTRACT</b>This study investigated the effect of calcium silicate hydrate (C-S-H) on copper (Cu) uptake, availability, geochemical speciation, and immobilization in the soil-plant system. C-S-H, prepared from coal gangue, was added to Cu-contaminated soil to assess its effect on pakchoi growth. C-S-H application increased soil pH, organic matter content, and cation exchange capacity while reducing electrical conductivity. It also increased soil microbial biomass and enzyme activities while reducing Cu bioavailability, mobility, and leaching toxicity. The possible Cu fixation mechanisms by C-S-H in soil media included ion exchange, complexation, and precipitation. Moreover, fresh biomass, dry biomass, plant height, and root length increased significantly by 5.81-23.74%, 8.48-34.69%, 5.13-29.42%, and 6.78-28.81%, respectively. Cu content in the shoots and roots of pakchoi decreased by 17.30-66.04% and 11.77-58.09%, respectively. These findings demonstrate that C-S-H is an effective soil amendment for reducing Cu accumulation in the pakchoi and enhances Cu solidification ability in contaminated soil.</p>","PeriodicalId":12009,"journal":{"name":"Environmental Technology","volume":" ","pages":"1-14"},"PeriodicalIF":2.2,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144126967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}