Environmental Technology & Innovation最新文献

{"title":"Green AgNPs from grapevine pruning waste: Synthesis and activity against P. aeruginosa","authors":"Anna Miskovska,&nbsp;Marketa Kulisova,&nbsp;Olga Matatkova,&nbsp;Jana Michailidu,&nbsp;Alena Cejkova,&nbsp;Irena Jarosova Kolouchova","doi":"10.1016/j.eti.2025.104287","DOIUrl":"10.1016/j.eti.2025.104287","url":null,"abstract":"<div><div>The scientific literature increasingly emphasizes environmentally sustainable treatments, circular economy principles, and effective waste management strategies. Grapevine (<em>Vitis vinifera</em>) is one of the most extensively cultivated crops worldwide, generating substantial amounts of waste rich in bioactive compounds. In this study, we investigate the stability and application of <em>V. vinifera</em> shoot extract for the green synthesis of silver nanoparticles (AgNPs). Key reaction parameters influencing nanoparticle stability—including temperature, pH, and light exposure—were systematically evaluated. Optimal synthesis was achieved at pH 7.5 and room temperature producing AgNPs with sizes ranging from 7 to 80 nm, depending on conditions. AgNPs synthesized at pH 7.5 exhibited excellent homogeneity and long-term stability, with no significant changes in UV-Vis absorbance after 24 months. Furthermore, the antibacterial activity of the AgNPs, the <em>V. vinifera</em> extract, and their combination was assessed against <em>Pseudomonas aeruginosa</em> strains. Our findings revealed a synergistic inhibitory effect, with the combined use of the extract and nanoparticles—without their separation from the reaction mixture—enhancing antimicrobial efficacy. This approach offers a promising and practical strategy for biomedical and environmental applications.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104287"},"PeriodicalIF":6.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167821","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":"Long-term exposure to PM2.5 and its components on human high low-density lipoprotein cholesterolemia: A 10-year cohort study in southwest China","authors":"Qinyu An ,&nbsp;Hui Liu ,&nbsp;Fuyan Zhang ,&nbsp;Qingqing Zhan ,&nbsp;Xiaoxue Li ,&nbsp;Lihua Yin ,&nbsp;Tao Liu","doi":"10.1016/j.eti.2025.104294","DOIUrl":"10.1016/j.eti.2025.104294","url":null,"abstract":"<div><h3>Background</h3><div>Limited research has focused on the independent effects of PM_2.5 chemical components sulfate (SO₄^2-), nitrate (NO₃^-), ammonium (NH₄⁺), organic matter (OM), and black carbon (BC) on high low-density lipoprotein cholesterolemia. Therefore, our research aims to investigate the potential casual links between long-term PM_2.5 and its components exposure and high low-density lipoprotein cholesterolemia, while identifying potentially susceptible subpopulations.</div></div><div><h3>Methods</h3><div>The study included 5442 participants from the Guizhou Population Health Cohort Study (GPHCS), which lasted for 10 years. A time-dependent Cox proportional hazards regression model was applied to calculate hazard ratios (HRs) and 95 % confidence intervals (CIs) for the risk of high low-density lipoprotein cholesterolemia. General linear models (GLMs) were utilized to evaluate the association between PM_2.5 and its components with low density lipoprotein cholesterol (LDL-C) levels.</div></div><div><h3>Results</h3><div>There was a total of 17,339.94 person-years (PYs), among which 1299 cases of high low-density lipoprotein cholesterolemia were found. All pollutants were associated with the incidence of high low-density lipoprotein cholesterolemia (<em>P</em> &lt; 0.05) except for BC. Each 1 SD increase in PM_2.5 (4.51 μg/m³₎ and PM_2.5 chemical components, including SO₄^2- (2.14 μg/m³) NO₃^- (1.36 μg/m³) NH₄⁺ (0.92 μg/m³) OM (2.57 μg/m³) and BC(0.70 μg/m³), was associated with increased LDL-C levels by 0.78 mmol/L (95 % CI: 0.73–0.84), 0.42 mmol/L (95 % CI: 0.36–0.48), 0.58 mmol/L (95 % CI: 0.53–0.62), 0.50 mmol/L (95 % CI: 0.46–0.55), 0.40 mmol/L (95 % CI: 0.34–0.45), and 0.31 mmol/L (95 % CI: 0.25–0.37), respectively. Subgroup analysis revealed long-term exposure to PM_2.5 and its components had a more substantial impact on minority population, individuals without exhaust ventilation, and those not using clean fuels.</div></div><div><h3>Conclusion</h3><div>This study shows that long-term exposure to PM_2.5 and its components was associated with an increased risk of high low-density lipoprotein cholesterolemia and elevated LDL-C levels, especially among minorities and those without exhaust ventilation or clean fuels.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104294"},"PeriodicalIF":6.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297332","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":"Partial substitution of biogas slurry for chemical fertilizer increased wheat grain yield while alleviating N2O emissions by improving soil quality and regulating N cycling genes","authors":"Eba Muluneh Sorecha,&nbsp;Renjie Ruan,&nbsp;Yue Yuan,&nbsp;Yaosheng Wang","doi":"10.1016/j.eti.2025.104286","DOIUrl":"10.1016/j.eti.2025.104286","url":null,"abstract":"<div><div>Overuse of chemical fertilizers (CF) degrades soil and environmental quality.Replacing chemical fertilizer (CF) with biogas slurry (BS), an organic alternative, offers a sustainable solution. However, the mechanisms by which BS balances yield benefits with N₂O emissions, along with metagenomic insights, remain unclear. This study examined six fertigation strategies including control,100 %CF, and 25 %, 50 %, 75 %, and 100 % BS substitution for CF, on soil quality index (SQI), nitrogen use efficiency (NUE), wheat growth and nutrient uptake, grain yield, and N₂O emissions, along with metagenomic analysis. The results showed that 50 % BS substitution significantly (<em>p</em> &lt; 0.001) increased wheat tillers (43.5 %), dry matter (21.6 %), N uptake (52.6 %), NUE (32.2 %), and grain yield (24.4 %) compared to 100 %CF. Furthermore, it also reduced N₂O emissions by 26.9 % and yield-scaled N₂O emissions by 44.8 %. The structural equation modeling (SEM) demonstrated that the enhanced SQI (57.8 %) significantly boosted grain yield and NUE, which was ascribed to the N₂O emission reduction. The 50 %BS treatment significantly reduced archaeal ammonia monooxygenase (Arch-<em>amoA</em>) abundance compared to 100 %CF, with metagenomic analysis revealing that N₂O emissions were mainly attributed to Arch-<em>amoA</em>. SEM analysis confirmed that N₂O emissions were mainly driven by Arch-<em>amoA</em> over the bacterial ammonia monooxygenase (Bac-<em>amoA</em>) in nitrification and <em>nosZ</em> over <em>nirS</em> in denitrification, significantly reducing emissions. Random Forest analysis identified that available N (NH₄⁺‐N and NO₃^--N) dominantly moderated grain yield, while soil pH, C:N, available N, and total N importantly regulated N₂O emissions. Replacing 50 % CF with BS in wheat sustainably enhances yield, reduces N₂O emissions, and promotes environmental sustainability.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104286"},"PeriodicalIF":6.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185695","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 impact of anthropogenic emissions sectors on the weekly cycle of ambient NO2 across China","authors":"Jianbin Gu ,&nbsp;Liangfu Chen ,&nbsp;Jinhua Tao ,&nbsp;Yanfang Tian ,&nbsp;Xiaoxia Liang ,&nbsp;Shipeng Song ,&nbsp;Meng Fan ,&nbsp;Yichen Li","doi":"10.1016/j.eti.2025.104284","DOIUrl":"10.1016/j.eti.2025.104284","url":null,"abstract":"<div><div>Nitrogen dioxide (NO₂) mainly originate from anthropogenic activities such as combustion of fossil fuels in road transport, industries, and thermal power plants. Since human activity in industrialized countries in general follows a seven-day cycle, NO₂ emissions are expected to be reduced during weekends (Saturday–Sunday), and thus display a weekly cycle with low levels on weekends and high on weekdays (Monday–Friday). However, as one of the regions suffering serious NO₂ pollution in the world, weekly cycle of China's NO₂ with significant weekend reduction has not been observed by using satellite measurements. In this study we used NO₂ column data from Tropospheric Monitoring Instrument (TROPOMI) and national and provincial statistics traffic and gross domestic product (GDP) data across China to investigate weekly cycle of NO₂ during the coronavirus disease 2019 (COVID-19) lockdown in the first quarter (Q1) of 2020, the subsequent economic recovery period in Q1 2021, and the impact period of the breakout of Omicron in Q1 2022. We find an increase in magnitude of weekend reduction in NO₂ levels by 8 % over China in Q1 2020 compared to Q1 2019 due to the lockdown restrictions, and passenger traveled, freight traveled, and secondary industry contributed 9 %, 66 %, and 25 % to this change, respectively. A decrease in weekend reduction by 7 % in Q1 2021 was observed due to economic stimulus packages issued by governments. Changes in provincial-level weekly cycle of NO₂ were also calculated, as well as the three emission source sectors variations.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104284"},"PeriodicalIF":6.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167279","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":"Nitrate and phosphate removal from water using a novel cellulose-based anion exchange hydrogel","authors":"Sepideh Ansari ,&nbsp;Ricardo Bello-Mendoza ,&nbsp;Aisling O’Sullivan ,&nbsp;Sumaira Basharat ,&nbsp;David Barker","doi":"10.1016/j.eti.2025.104289","DOIUrl":"10.1016/j.eti.2025.104289","url":null,"abstract":"<div><div>Excessive nitrate and phosphate in freshwater threaten aquatic ecosystems and human health. Anion exchange resins commonly used to remove these nutrients are typically derived from synthetic polystyrene-based polymers and produced using toxic chemicals and flammable solvents. To address this challenge, this study developed and validated a safer, less toxic cellulose-based anion exchange hydrogel (CAH) for phosphate and nitrate removal from water. The CAH was synthesised using renewable cellulose as the backbone and functionalised via grafting with methylene bisacrylamide (MBA) as a crosslinker and (2-(methacryloyloxy) ethyl) trimethylammonium chloride (MTAC) as cationising agent. The impact of various factors on nutrient adsorption was examined. FTIR, and Raman characterisation confirmed successful functionalisation and nutrient adsorption. The pseudo-second-order kinetics and Sips isotherm models accurately described the experimental data. High adsorption capacities of up to 74.4 mg/g for nitrate and 50.3 mg/g for phosphate were observed, with stable performance across a wide pH range (4–9). Electrostatic and ion exchange interactions and CAH’s high swelling ratio contributed to efficient and rapid adsorption. The adsorbent exhibited good regeneration potential, with the nitrate adsorption capacity remaining stable over ten consecutive adsorption–desorption cycles. The results highlight CAH’s potential as a sustainable and scalable adsorbent for continuous water treatment systems. Considering its biobased composition, there is potential for the spent hydrogel adsorbent to be incorporated into compost for the recycling of nitrate and phosphate in agriculture. This would align with circular economy principles and support sustainable development goals, including clean water and sanitation, and responsible consumption and production.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104289"},"PeriodicalIF":6.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204203","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":"Research on symbiosis models in manufacturing innovation ecosystems","authors":"Kun Li ,&nbsp;Xianliang Wang ,&nbsp;Qinchao Liang ,&nbsp;Yuan Li","doi":"10.1016/j.eti.2025.104285","DOIUrl":"10.1016/j.eti.2025.104285","url":null,"abstract":"<div><div>The symbiotic evolutionary model of manufacturing innovation ecosystems is of significant importance for promoting the high-quality development of the manufacturing sector. However, previous studies have mainly focused on linear symbiotic relationships between manufacturing industries and related sectors, lacking a comprehensive examination of the complex ecosystem characterized by multi-actor and multi-level dynamic interactions. Based on symbiosis theory, this study constructs an innovation ecosystem Lotka-Volterra evolutionary model, which includes core manufacturing enterprises, supporting manufacturing enterprises, and research institutions. Numerical simulations were conducted using MATLAB to explore the symbiotic evolution patterns. The study shows that mutualistic symbiosis is the optimal evolutionary model, effectively promoting scalable collaborative development for all actors; however, due to asymmetric resource flows, asymmetric symbiosis results in limited systemic benefits. Although parasitic symbiosis can temporarily enhance the competitiveness of individual actors, it undermines the overall stability of collaboration. Research institutions, as core innovation entities, play an irreplaceable role in providing technical support and facilitating knowledge spillovers. Based on the findings, the study proposes recommendations such as constructing mutualistic symbiosis mechanisms to promote multi-party collaborative development, strengthening industry-academia-research collaboration in manufacturing innovation ecosystems, enhancing industry-specific regulation, and establishing innovation guiding funds. The novelty of this research lies in developing a tri-party evolutionary game model that better aligns with the manufacturing innovation ecosystem, combining evolutionary game theory (EGT) with the Lotka-Volterra model and innovation ecosystems, thereby expanding both its theoretical boundaries and practical applications.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104285"},"PeriodicalIF":6.7,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154525","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":"Gut microbiota play a role in boosting the mating competitiveness of male Cydia pomonella by mitigating the DNA damage induced by X-ray irradiation","authors":"Zihan Wei ,&nbsp;Shici Zhao ,&nbsp;Xinyue Zhang ,&nbsp;Jia Li ,&nbsp;Ping Gao ,&nbsp;Xingya Wang ,&nbsp;Xueqing Yang","doi":"10.1016/j.eti.2025.104279","DOIUrl":"10.1016/j.eti.2025.104279","url":null,"abstract":"<div><div>X-ray irradiation is extensively utilized in the sterile insect technique (SIT) program for generating sterile insects. However, irradiation leads to DNA damage, induces random mutations in genes associated with fertility, and disrupts the composition of gut microbiota. Despite achieving sterility at 200 Gy, X-ray irradiation results in reduced mating competitiveness, thereby affecting the efficacy of SIT applications. However, the precise mechanism underlying radiation-induced sterility and decreased mating competitiveness in insects remains ambiguous. In this study, we investigated the effects of X-ray irradiation on DNA damage and repair, as well as the diversity of gut microbiota in <em>Cydia pomonella</em>, managed through X-ray irradiation-based SIT. Upon exposure to 200 Gy, the genomic template stability (GTS) of sterile male <em>C. pomonella</em> decreased significantly to approximately 86.57 % of the non-irradiated control, with GTS failing to recover to control levels. Additionally, irradiation triggered the up-regulation of genes involved in DNA damage response and repair. Analysis using 16S rRNA-seq confirmed alterations in the gut microbiota composition following 200 Gy X-ray treatment at the family and genus levels. Notably, replenishing <em>Stenotrophomonas</em>, a prominent constituent of the gut microbiota, demonstrated a notable capacity to elevate the expression levels of crucial damage response genes and repair genes in irradiated individuals compared to the control group, enhancing mating competitiveness of sterilized males. This study shed light on the understanding of the mechanisms underlying sterility induced by X-ray irradiation and underscores the crucial role of gut microbes in aiding hosts in coping with DNA damage and repair resulting from radiation-induced stress.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104279"},"PeriodicalIF":6.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167893","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":"Co-treating of chicken manure with wet market waste by black soldier fly larvae for synergetic bioconversion enhancement and gas reduction","authors":"Liwen Wang ,&nbsp;Guoyan Zhang ,&nbsp;Yiwei Dong,&nbsp;Shuaixin Tian,&nbsp;Zhipeng Wu,&nbsp;Hongliang Wang","doi":"10.1016/j.eti.2025.104283","DOIUrl":"10.1016/j.eti.2025.104283","url":null,"abstract":"<div><div>Adding organic wastes to chicken manure (CM) for co-digestion by black soldier fly (BSF) larvae is an effective means to improve the efficiency of manure degradation and bioconversion, but the trade-off in carbon (C) and nitrogen (N) distribution and environmental impact is still unclear. Six substrates were provided for BSF bioconversion: CM (control), vegetable waste (VEG), slaughtered chicken waste (SCH), discarded fish organs (DFI), the mixture of CM, VEG, and SCH with a 1:1:1 ratio (Mix1) and the mixture of CM, VEG, and DFI with a 1:1:1 ratio (Mix2). The effects on BSF growth performance, nutrient accumulation and environmental emissions were examined. In comparison with CM, VEG reduced 29.65 % of NH₃ emission, but the larvae yield (13.04 %) and nutrient accumulation were also decreased. Final larvae weight (16.20 % and 41.52 %) and survival ratio (26.00 % and 25.78 %) in animal-waste (SCH and DFI) treatments were improved, whereas the NH₃ (SCH) and CO₂ (DFI) emissions were significantly increased. Mix1 and Mix2 greatly improved the larval conversion efficiency and frass maturity, while reducing NH₃ emission (24.45 % and 14.08 %) and GHG emissions (38.42 % and 56.38 %). In addition, the mixed substrates (Mix1 and Mix2) exhibited superior performance in enhancing larval protein (2.93 % and 14.52 %) and biomass yield (75.99 % and 101.07 %) compared to CM. The quantitative distribution of C and N nutrients indicated that Mix1 was functional in gas mitigation, while Mix2 in insect biomass accumulation. In conclusion, co-conversion of CM with VEG and DFI is critical for synergistic emission reduction and nutrient accumulation in the BSF system.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104283"},"PeriodicalIF":6.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185696","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":"Integrating composite microorganism agents in rice-crayfish rotational cropping systems to enhance water quality and productivity","authors":"Yi Ren ,&nbsp;Sen Li ,&nbsp;Jiahui Shao ,&nbsp;Weibing Xun ,&nbsp;Youzhi Miao ,&nbsp;Zhihui Xu ,&nbsp;Nan Zhang ,&nbsp;Ruifu Zhang ,&nbsp;Qirong Shen","doi":"10.1016/j.eti.2025.104280","DOIUrl":"10.1016/j.eti.2025.104280","url":null,"abstract":"<div><div>Global agriculture urgently needs sustainable strategies to balance rising food demands with environmental constraints. Although rice-crayfish rotation cropping makes efficient use of land and water, poor straw decomposition and impaired water quality often limit yields. Conventional solutions that rely on chemical inputs or frequent water exchanges can be expensive and pose environmental risks, highlighting an urgent need for eco-friendly alternatives. To address these challenges, this study developed an innovative rice-crayfish rotational cropping system that integrates rice cultivation with crayfish breeding, using multifunctional microbial inoculants to enhance sustainability and productivity. Field experiments showed that inoculating the lignocellulose-decomposing fungus <em>Talaromyces funiculosus</em> XM21 significantly accelerated straw degradation and enriched soil nutrients. During the crayfish breeding phase, combined microbial applications (functional SynCom &amp; decomposer) improved water quality by reducing ammonia and nitrite levels and increasing dissolved oxygen content, leading to enhanced crayfish growth. These improvements, along with the application of beneficial microbes, increased rice yield and quality during the cultivation phase. Overall, the rice-crayfish system resulted in a 45.6 % increase in crayfish yields and a 26.4 % increase in rice yields, translating to a 77.2 % rise in income per hectare. This study highlights the potential of bioengineering strategies with beneficial microbial communities to enhance the sustainability and productivity of rice-crayfish systems, providing a pathway for modern agriculture amid environmental challenges.</div></div>","PeriodicalId":11725,"journal":{"name":"Environmental Technology & Innovation","volume":"39 ","pages":"Article 104280"},"PeriodicalIF":6.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154516","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":"Efficient microalgae harvesting: Synergistic flocculation and flotation with polyacrylamide and graphite electrolysis","authors":"Xuexia Zhu ,&nbsp;Tianchi Yin ,&nbsp;Lei Yin ,&nbsp;Xuanhe Jia ,&nbsp;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^–1 and electrolysis at 30 A m^–2 for 60 to 120 seconds being the most effective and energy-saving combination. At 10 mg L^–1 PAM concentration, a 95 % harvesting rate only needed 7.24 × 10^–5 kWh L^–1, while nearly 100 % efficiency required around 4.97 × 10^–4 kWh L^–1. 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 &gt; 0.65), especially at low PAM levels (≤5 mg L^–1) and current densities (≤20 A m^–2). 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}