Environmental Technology & Innovation最新文献

{"title":"Dynamic multi-objective optimization of rice irrigation integrating crop growth and water cycle dynamics: Promoting synergies in water conservation, production enhancement, and emission reduction","authors":"Aizheng Yang ,&nbsp;Zhenyi Sun ,&nbsp;Pingan Zhang ,&nbsp;Kun Hu ,&nbsp;Shuyuan Luo ,&nbsp;Wenhao Dong ,&nbsp;Mo Li","doi":"10.1016/j.eti.2025.104241","DOIUrl":"10.1016/j.eti.2025.104241","url":null,"abstract":"<div><div>An optimized rice irrigation system is critical not only for conserving water resources and ensuring global food security, but also for mitigating environmental pollution caused by inefficient water use and excessive carbon emissions. This study, conducted in the Changgang Irrigation District of Lanxi County, integrates daily rice physiological growth data and meteorological parameters with the EPIC crop growth model, the crop photosynthetic production model, and hydrological cycle dynamics. A multi-objective optimization and regulation model is formulated to achieve synergistic goals of water conservation, emission reduction, and production enhancement through dynamic irrigation control. Results demonstrate that the optimized strategy reduces water use by 12.56 %, improves water use efficiency by 2.11 %, increases yield by 3.05 %, and decreases the carbon footprint by 7.80 % compared to the current irrigation scenario. Incorporating CMIP6 climate change scenario models into the optimization framework further reveals that the irrigation requirement is lowest under the SSP126–2023–2030 scenario and highest under the SSP126–2031–2040 scenario. Future climate warming accelerates rice maturation and shortens the growing period, increasing irrigation demand in June and July while reducing it in August. This study provides a scientific basis for optimizing irrigation schedules under changing climatic conditions, addressing challenges of water scarcity, emissions, and productivity. The findings offer practical decision-making tools to achieve sustainable agricultural water management and enhance rice production efficiency.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104241"},"PeriodicalIF":6.7,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949120","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}

{"title":"Distribution, sources, and transport of microplastics in a karst river of Southwest China","authors":"YingZeng Yang ,&nbsp;Xiao Ma ,&nbsp;Shaoqi Zhou ,&nbsp;Laifeng Zhou","doi":"10.1016/j.eti.2025.104252","DOIUrl":"10.1016/j.eti.2025.104252","url":null,"abstract":"<div><div>Microplastics (MPs) have emerged as a significant pollutant in riverine ecosystems, yet their transport and distribution in karst rivers remain largely unexplored. This study examines MPs (20–500 μm) in surface water and sediments of the Wuma River, a karst river in Southwest China. Key findings indicate that abundance of MPs ranged from 4 to 122 n/L in surface water and 1702.25 to 16,594.73 n/kg in sediments, with fragments (∼90 %) dominating. More than 85 % of MPs fall within the 20–100 μm size range, with polyurethane (PU) and polyethylene terephthalate (PET) as the most prevalent polymers. MPs mainly originate from residential activities, agriculture, riverbank tourism, and tire and road abrasion. Karst river channel characteristics play a significant role in MPs retention. Overflow dams increase retention of smaller-sized MPs (20–50 μm), while underground river networks, large boulders, and riparian vegetation influence downstream movement and redistribution. Additionally, river dredging effectively reduces MPs accumulation in sediments. The results advances understanding of MPs behavior in karst fluvial systems, emphasizing the necessity for targeted mitigation strategies to protect these ecologically fragile environments.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104252"},"PeriodicalIF":6.7,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949125","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}

{"title":"Napyradiomycin-based coatings: Promising eco-friendly, sustainable and circular solutions for effective marine antibiofouling","authors":"Isabel Pereira ,&nbsp;Helena Macedo ,&nbsp;Inês Ferreira ,&nbsp;Bárbara Gonçalves ,&nbsp;Susana Piçarra ,&nbsp;Rita G. Sobral ,&nbsp;Mário Diniz ,&nbsp;Susana P. Gaudêncio","doi":"10.1016/j.eti.2025.104248","DOIUrl":"10.1016/j.eti.2025.104248","url":null,"abstract":"<div><div>This study introduces a groundbreaking approach to marine antifouling by incorporating napyradiomycins extracts, meroterpenoids derived from marine actinomycetes, into biocide-free coatings, establishing the first comprehensive assessment of their dual antimicro- and antimacrofouling potential. By leveraging naturally derived bioactives, this work pioneers a sustainable alternative to copper- and ivermectin-based formulations, aligning with circular bioeconomy and green chemistry principles. At low concentrations (31.25 µg/mL), napyradiomycin-based coatings demonstrated effective macrofouling prevention with no detectable toxicity, while higher concentrations (10 mg/mL) rivaled conventional coatings in efficacy and induced lethality. Uniquely, ecotoxicological evaluations using oxidative stress biomarkers, supported by mussels’ survival assays, revealed no significant adverse effects at the lower concentration, showcasing an environmentally friendly profile rarely achieved in antifouling solutions. Despite the promising results, limitations under current static laboratory conditions include no antibiofilm activity and the need for long-term field validation under dynamic marine environments. These challenges, however, offer valuable opportunities for future research in formulation refinement, release profile optimization, and biocide loading thresholds. By combining antimacrofouling efficacy with low ecological impact and scalability potential, these coatings represent a promising advance in marine coating technology, warranting clear path forward for enhancing sustainability in marine industry practices while protecting marine biodiversity.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104248"},"PeriodicalIF":6.7,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936406","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}

{"title":"Effects of biochar combined with different nitrogen fertilization rates on turf quality and carbon footprint in a turf system","authors":"Songsong Shen,&nbsp;Shang Pan,&nbsp;Jian Hu,&nbsp;Jingjin Yu,&nbsp;Zhimin Yang","doi":"10.1016/j.eti.2025.104249","DOIUrl":"10.1016/j.eti.2025.104249","url":null,"abstract":"<div><div>Biochar has been widely recognized for its potential to mitigate greenhouse gas emissions and enhance soil fertility through increased soil organic carbon (SOC) storage; however, systematic evaluations of carbon balance and ecological benefits in turf systems remain scarce. This study included eight treatments combining four N (nitrogen) rates (N₀: 0, N₁: 150, N₂: 225, N₃: 300) kg N ha⁻¹ with two biochar practices (SB₀: 0, SB:40) t ha⁻¹. The results showed that biochar application treatments (N₀SB, N₁SB, N₂SB, and N₃SB) reduced cumulative fluxes of soil N₂O and CH₄ (global warming potential, GWP) by 17.37 %, 26.62 %, 32.73 %, and 30.97 %, net global warming potential (NGWP) 43.71 %, 369.64 %, 1046.17 %, and 545.83 %, and CF by 32.01 %, 192.81 %, 356.66 %, and 253.34 %, while increasing SOC sequestration by 129.20 %, 138.61 %, 133.89 %, and 133.61 %, total biomass by 3.99 %, 14.22 %, 15.51 %, and 14.78 %, and turf normalized difference vegetation index (NDVI) by −0.18 %, 2.81 %, 2.81 %, and 1.89 % compared to non-biochar treatments. Although biochar slightly increased ecosystem respiration, the effect was not significant (<em>p</em> &gt; 0.05). Notably, compared to N₃SB, N₂SB significantly reduced N₂O by 12.85 %, CH₄ by 11.47 %, CF (carbon footprint) by 16.01 %, and NGWP by 9.82 %, while ecosystem respiration, SOC storage, turfgrass total biomass, and NDVI exhibited no significant differences between the two treatments. Overall, the co-application of biochar with 225 kg N ha⁻¹ is a win−win strategy for reducing CF, enhancing carbon sequestration, and maintaining turf quality.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104249"},"PeriodicalIF":6.7,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936405","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}

{"title":"The effect of moisture content on dynamics changes of antibiotic resistance genes during sheep manure composting on Qinghai-Tibet Plateau: Insight into changes in potential host microorganisms","authors":"Rongrong Li ,&nbsp;Xi Luo ,&nbsp;Yuru Liu ,&nbsp;Lu Zhang ,&nbsp;Wenbo Yu ,&nbsp;Rui Cai","doi":"10.1016/j.eti.2025.104251","DOIUrl":"10.1016/j.eti.2025.104251","url":null,"abstract":"<div><div>The Qinghai-Tibet Plateau is characterized by its low temperature and thin oxygen climate, which results in hypoxic conditions during the composting of livestock and poultry manure in this region. Reducing moisture content can enhance oxygen flow through the composting pile, thereby improving humification efficiency. However, the impact of moisture content on antibiotic removal and changes in antibiotic resistance genes (ARGs) during animal manure composting on the Tibetan Plateau remains unclear. Building upon prior research, this study further investigated the dynamic changes of antibiotic concentration and ARGs during sheep manure composting on the Qinghai-Tibet Plateau at two moisture contents: 45% (M45) and 60% (M60). Additionally, the study analyzes the influencing factors and host microorganisms associated with ARGs. The results showed that, compared with M60, M45 could significantly decrease the concentrations of oxytetracycline, cephalosporin C, and penicillin in compost products by 4.37%, 3.94%, and 4.37%, respectively (<em>P</em> &lt; 0.05). M45 can influence the dynamic changes of ARGs by altering the temperature, pH, total nitrogen, organic matter, humus content, and microbial communities of compost. Compared with M60, M45 reduced the abundance of ARGs conferring resistance to beta-lactam, multidrug, bacitracin, tetracycline, and vancomycin. <em>Corynebacterium</em>, <em>Jeotgalicoccus</em>, <em>Nocardiopsis</em>, <em>Brachybacterium</em>, and <em>Arthrobacter</em> were the main potential hosts of ARGs during the early stages of composting, whereas <em>Streptomyces</em>, <em>Pseudoxanthomonas</em>, <em>Luteimonas</em>, and <em>Thermobifida</em> became the main potential hosts during the late stages. These findings suggest that reducing moisture content can significantly enhance the removal efficiency of antibiotics and ARGs in sheep manure compost on the Qinghai-Tibet Plateau.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104251"},"PeriodicalIF":6.7,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923979","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}

{"title":"Biochar carbon-based amendment rather than straw contributes to the mitigation of greenhouse gas emissions while increasing crop yield: Insights from a field experiment and density functional theory calculation","authors":"Debo He ,&nbsp;Zhixin Dong ,&nbsp;Bo Zhu","doi":"10.1016/j.eti.2025.104250","DOIUrl":"10.1016/j.eti.2025.104250","url":null,"abstract":"<div><div>Soil greenhouse gas (GHG) emissions from anthropogenic activities, particularly agriculture, pose a considerable challenge to ecological security. Recently, applying biochar and straw has been recognized as a potential measure to enhance soil carbon sequestration and combat climate change. However, the mechanisms underlying the differences in surface properties of biochar and straw on soil GHG emissions remain unclear. Therefore, this study evaluated the soil GHG emissions reduction potential of biochar- and straw-amended fields based on long-term experimental plots. Additionally, we employed density functional theory calculations to investigate how the distinct surface properties of biochar and straw influence soil GHG emissions at the molecular level. The findings indicated that biochar-amended fields increased CH₄ uptake by 320.7 % and reduced N₂O emissions by 63.1 % compared to conventional fertilized (CK) fields, resulting in a net reduction of 538.4 kg ha^–1 in CO₂ equivalent (CO₂eq) emissions, with an increase in crop yield by 10.9 %. The straw-amended field increased CO₂ emissions by 31.4 %, resulting in a net increase of 1261.2 kg CO₂eq ha^–1 compared to CK. The enhanced resistance to biochemical decomposition and stronger adsorption interactions, facilitated by the aromatized stabilized structure and functional biochar groups, are key factors enabling biochar-amended soils to exhibit lower GHG emissions intensities than straw. These findings could represent a breakthrough in understanding how biochar balances soil carbon sequestration with GHG emissions while aiding in optimizing crop residue management practices to sustain soil health and promote sustainable agricultural and ecological development.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104250"},"PeriodicalIF":6.7,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918119","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}

{"title":"N-cycling functional genes and soil properties shape the heterogeneity of nitrous oxide emission pathways in tea plantation soils","authors":"Longping Tu ,&nbsp;Zhe Xu ,&nbsp;Huacheng Yin ,&nbsp;Yubing Dong ,&nbsp;Ruoya Ma ,&nbsp;Yawen Huang ,&nbsp;Shuang Wu ,&nbsp;Shuqing Li ,&nbsp;Shuwei Liu ,&nbsp;Jinyang Wang ,&nbsp;Zhaoqiang Han ,&nbsp;Jianwen Zou","doi":"10.1016/j.eti.2025.104245","DOIUrl":"10.1016/j.eti.2025.104245","url":null,"abstract":"<div><div>Tea (<em>Camellia sinensis</em>), one of the world’s most popular beverages, plays a vital role in socio-economic development. However, nitrous oxide (N₂O) emissions from tea plantation soils have become a serious environmental issue, largely due to soil acidification and excessive N fertilizer inputs. Despite this, there is still a knowledge gap in determining how much nitrification and denitrification contribute to overall N₂O emissions in tea plantation soils, which makes it difficult to make focused mitigation strategies. Here, we utilized ¹⁵N isotope labeling experiments to probe into the contribution of various microbial pathways to N₂O emissions of tea plantation soils across seven major tea-producing provinces in China. We assessed soil properties, microbial diversity and composition, N₂O production-and-reduction-related functional gene abundances, and keystone species abundances to probe into driving mechanisms influencing N₂O sources. The results revealed significant heterogeneity of N₂O emission intensity and pathways among different tea plantation soils. Co-denitrification and heterotrophic nitrification emerged as the primary contributors of N₂O emissions, accounting for an average of 34 % and 41 %, respectively. However, the mean contributions of denitrification and autotrophic nitrification were only 22 % and 3 %, respectively. Variance partitioning and correlation analyses indicated that this heterogeneity was predominantly driven by N-cycling gene abundances and soil properties (both contributed 71 % of the explanation) rather than microbial diversity and keystone species abundance. This study advances our understanding of the soil N-cycling process in acidic soils and provides a groundwork for formulating targeted measures to reduce N₂O emissions based on the dominant pathways in tea plantation soils.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104245"},"PeriodicalIF":6.7,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918118","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}

{"title":"Effects of manure application and tetracycline contamination on soil enzyme activity and tetracycline resistance genes in soils: Effects of vegetation","authors":"Wencong Ma ,&nbsp;Wenxi Jiang ,&nbsp;Lin Li ,&nbsp;Huan Liu ,&nbsp;Mengmeng Zhang ,&nbsp;Dandan Wang ,&nbsp;Ruichao Guo ,&nbsp;Yulong Wang ,&nbsp;Xuhui Li","doi":"10.1016/j.eti.2025.104246","DOIUrl":"10.1016/j.eti.2025.104246","url":null,"abstract":"<div><div>While manure improves soil quality, it can also be a significant source of antibiotics and antibiotic resistance genes (ARGs), especially for manures with high concentrations of antibiotics. We conducted a pot experiment with/without culturing pakchoi in soils with three manure application amounts and four TC contamination levels to evaluate how vegetation affects the persistence of tetracyclines (TCs) and tetracycline resistance genes (TRGs) in manure-amended soils and identify key microbial taxa driving ARG dissemination under TC contamination. After cultivation for 35 days, soil samples were collected and analyzed for residual TCs, soil enzyme activities, and TRG (including <em>tetA</em>, <em>tetB/P</em>, <em>tetC</em>, <em>tetG</em>, <em>tetM</em>, <em>tetO</em>, <em>tetW</em>, <em>tetT</em>, and <em>tetX</em>) and class 1 integron-integrase gene (<em>intI1</em>). The results revealed that vegetation decreased the oxytetracycline (OTC) and chlortetracycline (CTC) residues by 55.60 % and 38.59 %, respectively; however, it increased TC from 0.3988 mg/kg to 0.6422 mg/kg in high amounts of TC-manure treatments. Manure application improved the soil polyphenol oxide (S-PPO) activity (up to 134.06 % in high-amount manure treatments without vegetation). The <em>tetC</em> abundance decreased with the TC and/or manure treatments. In contrast, the abundance of <em>tetM</em>, <em>tetO</em>, and <em>tetX</em> increased, especially in the vegetation group with large amounts of manure, indicating that the main resistance mechanisms might be changed. Spearman’s correlation analysis, PCA, and network analysis revealed that manure-borne microorganisms had positive correlations with <em>intI1</em> and multiple TRGs, and <em>Xanthomonadaceae</em> might play an important role in TRG dissemination. Moreover, vegetation changed the structure of soil microorganisms and the main host of TRGs, suggesting that vegetation changed their diffusion route. These results elucidate the role of vegetation in soil ecology under TC-manure conditions and emphasize the effect of the key taxa to manage ARG risks in agricultural activities.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104246"},"PeriodicalIF":6.7,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906692","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}

{"title":"Per- and polyfluoroalkyl substances (PFASs) exposure and gastric cancer risk: Insights from exposome-metabolome profiling","authors":"Juan Zhu ,&nbsp;Sainan Li ,&nbsp;Xue Li ,&nbsp;Linlin Wang ,&nbsp;Lingbin Du","doi":"10.1016/j.eti.2025.104242","DOIUrl":"10.1016/j.eti.2025.104242","url":null,"abstract":"<div><div>The environmental persistence and bioaccumulative nature of per- and polyfluoroalkyl substances (PFAS) have emerged as a critical environmental health concern, particularly regarding their carcinogenic potential. However, limited studies have systematically investigated the association between PFAS exposure and gastric cancer risk, particularly in high-incidence regions such as China. We quantified ten PFAS congeners and characterized metabolomic profiles in pre-treatment plasma samples from gastric cancer patients and matched controls using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Multivariable logistic regression evaluated individual PFAS and GC risk. Mixture effects were interrogated via advanced multipollutant modeling techniques—Bayesian Kernel Machine Regression (BKMR) and quantile-based g-computation (qgcomp). Linear regression was applied to evaluate the association between PFAS levels and gastric cancer-associated metabolic biomarkers, and pathway enrichment analysis identified related metabolic pathways. Three legacy PFAS demonstrated independently positive relationships with gastric cancer risk: perfluorobutanesulfonic acid (PFBS) (adjusted OR=4.12, 95 %CI:1.70–9.96 per unit increase), perfluorodecanoic acid (PFDA) (OR=2.61, 95 %CI: 1.08–6.30), and perfluoroundecanoic acid (PFUnDA) (OR=7.98, 95 %CI: 3.04–20.92). These associations remained robust in high vs. low PFAS exposure comparisons. Multipollutant modeling showed no significant association between PFAS mixtures and gastric cancer risk. Metabolomic analysis revealed distinct perturbation patterns, with PFBS, PFDA, and PFUnDA correlated with 14, 6, and 62 gastric cancer-related metabolites, respectively. Enrichment analysis identified four significantly disrupted metabolic pathways: butanoate metabolism, D-amino acid metabolism, histidine metabolism, and glycerolipid metabolism. This study provides novel epidemiological evidence implicating specific PFAS congeners in gastric carcinogenesis, potentially mediated through metabolic pathway disruption. These results underscore the necessity for longitudinal studies to elucidate temporality and mechanistic underpinnings of PFAS-induced metabolic reprogramming in gastric cancer development.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104242"},"PeriodicalIF":6.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931458","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}

{"title":"Enhancing granule formation: The role of chitosan and chitosan nanoparticles in microalgal-bacterial granular sludge development","authors":"Alfonz Kedves ,&nbsp;Zoltán Kónya","doi":"10.1016/j.eti.2025.104240","DOIUrl":"10.1016/j.eti.2025.104240","url":null,"abstract":"<div><div>Microalgal-bacterial granular sludge (MBGS) is an emerging wastewater treatment technology that enhances nutrient removal through the synergistic interactions of microalgae and bacteria. However, the slow granulation process remains a significant limitation. Therefore, this study investigates the effects of chitosan (Ch) and chitosan nanoparticles (Ch NPs) on accelerating MBGS formation and enhancing system performance. Three photo-sequencing batch reactors (PSBRs) were operated for 70 days, where R1 served as a control, R2 received chitosan, and R3 received chitosan nanoparticles at 5 mg L⁻¹. The results revealed that Ch and Ch NPs significantly reduced granulation time, with granules forming in R2 by day 28 (33 %) and in R3 by day 14 (67 %) compared to R1 (day 42). Biomass retention was enhanced, with final MLSS concentrations of 6.27 g L⁻¹ (R2) and 6.65 g L⁻¹ (R3), surpassing R1 (5.83 g L⁻¹). The extracellular polymeric substances (EPS) content was also notably higher in R2 (170.4 mg g⁻¹ MLVSS) and R3 (180.6 mg g⁻¹ MLVSS), contributing to improved sludge stability and flocculation. Nutrient removal performance was enhanced, with COD, NH₄⁺-N, and PO₄^3--P removal efficiencies reaching 98 %, 99 %, and 98 %, respectively. The microbial community analysis indicated that Ch and Ch NPs selectively promoted <em>Nakamurella</em>, increasing its abundance from 0.26 % (control) to 20.91 % (R2) and 48.18 % (R3), while also stimulating the growth of EPS-producing <em>Micropruina</em> and filamentous <em>Streptomyces</em>, further facilitating granulation. This study demonstrates that chitosan-based biopolymer addition significantly accelerates MBGS formation and enhances sludge stability, providing a promising strategy for optimizing wastewater treatment processes.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104240"},"PeriodicalIF":6.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918120","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}