Water Research X最新文献

{"title":"An overlooked nanofluids effect from Fe3O4 nanoparticles enhances mass transfer in anammox granular sludge","authors":"Dongdong Xu ,&nbsp;Aqiang Ding ,&nbsp;Yang Yu ,&nbsp;Ping Zheng ,&nbsp;Meng Zhang ,&nbsp;Zhetai Hu","doi":"10.1016/j.wroa.2024.100260","DOIUrl":"10.1016/j.wroa.2024.100260","url":null,"abstract":"<div><div>Magnetite (Fe₃O₄) particles have been widely reported to enhance the anammox's activity in anammox granular sludge (AnGS), yet the underlying mechanisms remain unclear. This study demonstrates that both Fe₃O₄ microparticles (MPs) and nanoparticles (NPs) at a dosage of 200 mg Fe₃O₄/L significantly increased the specific anammox activity (SAA) of AnGS. Additionally, the transcriptional activities of the <em>hzs</em> and <em>hdh</em> genes involved in the anammox process, as well as the heme <em>c</em> content in AnGS, were also notably enhanced. Notably, Fe₃O₄ NPs were more effective than MPs in boosting anammox activity within AnGS. Mechanistically, Fe₃O₄ MPs released free iron, which anammox bacteria utilized to promote the synthesis of key enzymes, thereby enhancing their activity. Compared to MPs, Fe₃O₄ NPs not only elevated the synthesis of these key enzymes to a higher level but also induced a nanofluids effect on the surface of AnGS, improving substrate permeability and accessibility to intragranular anammox bacteria. Moreover, the nanofluids effect was identified as the primary mechanism through which Fe₃O₄ NPs enhanced anammox activity within AnGS. These findings provide new insights into the effects of nanoparticles on granular sludge systems, extending beyond AnGS.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Start-up of a full-scale two-stage partial nitritation/anammox (PN/A) process treating reject water from high solid anaerobic sludge digestion (HSAD)","authors":"Shuyan Zhou ,&nbsp;Hui Gong ,&nbsp;Enhui Xu ,&nbsp;Xiang Chen ,&nbsp;Xiankai Wang ,&nbsp;Hang Wang ,&nbsp;Danyang Zhu ,&nbsp;Yanyan Zhang ,&nbsp;Jing Yang ,&nbsp;Guowei Gu ,&nbsp;Xiaohu Dai","doi":"10.1016/j.wroa.2024.100259","DOIUrl":"10.1016/j.wroa.2024.100259","url":null,"abstract":"<div><div>High solid anaerobic digestion (HSAD) achieves the benefits of high volumetric loading rates and lower reject water production, which, however, results in much more concentrated reject water with a remarkable increase in organics and nitrogen compared with that from conventional AD with low solid content. The high concentrations of ammonium (2000–3500 mg/L) and COD (3000–4000 mg/L) were reported to exert inhibition on anammox bacteria (AnAOB), posing challenges to the application of the partial nitritation/anammox (PN/A). To date, no cases of PN/A process start-up for sludge HSAD reject water were reported. This study demonstrated the start-up process of a 480 m³/d PN/A project without anammox sludge inoculation and treating HSAD reject water from a centralized dewatered sludge treatment plant. The project did not construct new infrastructures but utilized previously constructed tanks to upgrade the process from existing short-cut nitrification-denitrification to a two-stage PN/A process. Although no external anammox sludge inoculation was performed to save seeding sludge cost, the start-up was successfully achieved in about 9 months (273 days) based on a three-step method of “AnAOB enrichment - sludge acclimation - capacity doubling”. During start-up, the relative abundance of AnAOB (Candidatus_<em>Kuenenia</em>) increased from near zero to 12.0%. After start-up, the total inorganic nitrogen (TIN) removal load reached 0.74 kgN/(m³•d), with a total nitrogen removal efficiency of over 90%. Compared to the traditional nitrification-denitrification process, the PN/A process remarkably reduces the addition of organic chemicals and aeration energy consumption, saving approximately 4.2 million yuan (RMB) in operational costs annually. In summary, this research provides a full-scale reference for the start-up of the PN/A process treating sludge HSAD reject water.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adjusted bacterial cooperation in anammox community to adapt to high ammonium in wastewater treatment plant","authors":"Yiming Feng ,&nbsp;Lingrui Kong ,&nbsp;Ru Zheng ,&nbsp;Xiaogang Wu ,&nbsp;Jianhang Zhou ,&nbsp;Xiaochen Xu ,&nbsp;Sitong Liu","doi":"10.1016/j.wroa.2024.100258","DOIUrl":"10.1016/j.wroa.2024.100258","url":null,"abstract":"<div><div>Bacterial cooperation is very important for anammox bacteria which perform low-carbon and energy-efficient nitrogen removal, yet its variation to adapt to high NH₄⁺-N concentration in actual wastewater treatment plants (WWTPs) remains unclear. Here, we found wide and varied cross-feedings of anammox bacteria and symbiotic bacteria in the two series connected full-scale reactors with different NH₄⁺-N concentrations (297.95 ± 54.84 and 76.03 ± 34.01 mg/L) treating sludge digester liquor. The uptake of vitamin B6 as highly effective antioxidants secreted by the symbiotic bacteria was beneficial for anammox bacteria to resist the high NH₄⁺-N concentration and varied dissolved oxygen (DO). When NH₄⁺-N concentration in influent (1785.46 ± 228.5 mg/L) increased, anammox bacteria tended to reduce the amino acids supply to symbiotic bacteria to save metabolic costs. A total of 26.1% bacterial generalists switched to specialists to increase the stability and functional heterogeneity of the microbial community at high NH₄⁺-N conditions. V/A-type ATPase for anammox bacteria to adapt to the change of NH₄⁺-N was highly important to strive against cellular alkalization caused by free ammonia. This study expands the understanding of the adjusted bacterial cooperation within anammox consortia at high NH₄⁺-N conditions, providing new insights into bacterial adaptation to adverse environments from a sociomicrobiology perspective.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000483/pdfft?md5=7ffa4b45655da7c93c477b20987f4088&pid=1-s2.0-S2589914724000483-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced nitrogen removal for low C/N wastewater via preventing futile carbon oxidation and augmenting anammox","authors":"Song Chen ,&nbsp;Qing-Pei Zhang ,&nbsp;Jin-Song Zhang ,&nbsp;Na An ,&nbsp;Hai-Yang Yu ,&nbsp;Xiang Fu ,&nbsp;Zhi-Hua Li","doi":"10.1016/j.wroa.2024.100253","DOIUrl":"10.1016/j.wroa.2024.100253","url":null,"abstract":"<div><p>Efficient carbon use is crucial for biological nitrogen removal. Traditional aerobic processes can waste carbon sources, exacerbating carbon deficiency. This study explores an anaerobic/oxic/anoxic system with sludge double recirculation to improve nitrogen removal in low C/N wastewater. This system integrated aerobic nitrification after the carbon intracellular storage, separating carbon and nitrogen by denitrifying glycogen-accumulating organisms (DGAOs) with endogenous partial denitrification and Anammox within the anoxic units. A significant efficiency of 91.02±7.01% chemical oxygen demand (COD) was converted into intracellular carbon in anaerobic units, significantly reducing carbon futile oxidation in the aerobic units by effectively separating COD from ammonia. Intracellular storage of carbon sources and microbial adaptation to carbon scarcity prevent futile oxidation of COD in the aerobic units even with short-term high dissolved oxygen (DO), thereby enhancing nitrogen removal under anoxic conditions with sufficient intracellular carbon source. The microbial analysis identified <em>Candidatus Brocadia</em> as the dominant anammox bacteria, in combination with the activity of DGAOs and other related microbial communities, accounting for 37.0% of the TN removal. Consequently, the system demonstrated remarkable nitrogen removal efficiencies, achieving 81.3±3.3% for total nitrogen (TN) and 98.5±0.9% for ammonia nitrogen while maintaining an effluent COD concentration of 17.2±9.1 mg/L, treating the low C/N of 4.18 in the influent wastewater. The findings in this study provide a sustainable and energy-saving technique for conventional WWTPs to meet strict discharge standards by avoiding futile oxidation of COD and encouraging anammox contributions.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000434/pdfft?md5=1eb91a37d71c07e16bc964ffed379843&pid=1-s2.0-S2589914724000434-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pharmaceuticals in raw and treated water from drinking water treatment plants nationwide: Insights into their sources and exposure risk assessment","authors":"Kimberly Etombi Muambo ,&nbsp;Min-Gyeong Kim ,&nbsp;Da-Hye Kim ,&nbsp;Sangmin Park ,&nbsp;Jeong-Eun Oh","doi":"10.1016/j.wroa.2024.100256","DOIUrl":"10.1016/j.wroa.2024.100256","url":null,"abstract":"<div><p>Due to the large amounts of pharmaceuticals and personal care products (PPCPs) currently being consumed and released into the environment, this study provides a comprehensive analysis of pharmaceutical pollution in both raw and treated water from full-scale drinking water treatment plants nationwide. Our investigation revealed that 30 out of 37 PPCPs were present in raw water with mean concentrations ranging from 0.01–131 ng/L. The raw water sources, surface water (ND – 147 ng/L), subsurface water (ND – 123 ng/L) and reservoir sources (ND – 135 ng/L) exhibited higher mean concentration levels of pharmaceutical residues compared to groundwater sources (ND – 1.89 ng/L). Meanwhile, in treated water, 17 of the 37 analyzed PPCPs were present with carbamazepine, clarithromycin, fluconazole, telmisartan, valsartan, and cotinine being the most common (detection frequency &gt; 40 %), and having mean concentrations of 1.22, 0.12, 3.48, 40.1, 6.36, and 3.73 ng/L, respectively. These findings highlight that, while water treatment processes are effective, there are some persistent compounds that prove challenging to fully eliminate. Using Monte Carlo simulations, risk assessment indicated that most of these compounds are likely to have negligible impact on human health, except for the antihypertensives. Telmisartan was identified as posing the highest ecological risk (RQ &gt; 1), warranting further investigation, and monitoring. The study concludes by prioritizing specific 14 pharmaceuticals, including telmisartan, clarithromycin, lamotrigine, cotinine, lidocaine, tramadol, and others, for future monitoring to safeguard both ecological and human health.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S258991472400046X/pdfft?md5=c0449fa744b973488f0454b58804b7b9&pid=1-s2.0-S258991472400046X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142151986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isotope analysis of nitrogen removal pathways and N2O production potential in the SDAD-anammox system under different N/S ratios","authors":"Mengjia Zhan,&nbsp;Wei Zeng,&nbsp;Xiaojing Hao,&nbsp;Haohao Miao,&nbsp;Yao Lu,&nbsp;Wenzhuo Jiang,&nbsp;Qingan Meng,&nbsp;Qingteng Gong","doi":"10.1016/j.wroa.2024.100257","DOIUrl":"10.1016/j.wroa.2024.100257","url":null,"abstract":"<div><p>This study explored the impact of varying nitrate to sulfide (N/S) ratios on nitrogen removal efficiency (NRE) in the sulfide-driven autotrophic denitrification and anammox (SDAD-anammox) system. Optimal nitrogen removal was observed at N/S ratios between 1.5 and 2.0. Isotope tracing results showed that the contribution of anammox to nitrogen removal was enhanced with increasing N/S ratios, reaching up to 37 % at the N/S ratio of 2.5. Additionally, complex nitrogen pathways were identified, including dissimilatory nitrate reduction to ammonium (DNRA). Furthermore, isotope tracing was innovatively applied to investigate N₂O emissions, demonstrating that higher N/S ratios significantly reduced N₂O emissions, with the lowest emissions at N/S ratio of 2.5. Gene expression analysis indicated that nitrogen and sulfide transformation genes decreased with increasing N/S ratios, while anammox-related genes first increased and then decreased, reflecting the system's microbial dynamics. These findings offer insights into nitrogen transformation pathways and N₂O production mechanisms in the SDAD-anammox process.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000471/pdfft?md5=d6ed47327a5b5128585147d5df00a2ff&pid=1-s2.0-S2589914724000471-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142232145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A cohesive Microcoleus strain cluster causes benthic cyanotoxic blooms in rivers worldwide","authors":"Pilar Junier ,&nbsp;Guillaume Cailleau ,&nbsp;Mathilda Fatton ,&nbsp;Pauline Udriet ,&nbsp;Isha Hashmi ,&nbsp;Danae Bregnard ,&nbsp;Andrea Corona-Ramirez ,&nbsp;Eva di Francesco ,&nbsp;Thierry Kuhn ,&nbsp;Naïma Mangia ,&nbsp;Sami Zhioua ,&nbsp;Daniel Hunkeler ,&nbsp;Saskia Bindschedler ,&nbsp;Simon Sieber ,&nbsp;Diego Gonzalez","doi":"10.1016/j.wroa.2024.100252","DOIUrl":"10.1016/j.wroa.2024.100252","url":null,"abstract":"<div><p>Over the last two decades, proliferations of benthic cyanobacteria producing derivatives of anatoxin-a have been reported in rivers worldwide. Here, we follow up on such a toxigenic event happening in the Areuse river in Switzerland and investigate the diversity and genomics of major bloom-forming riverine benthic cyanobacteria. We show, using 16S rRNA-based community profiling, that benthic communities are dominated by Oscillatoriales. We correlate the detection of one <em>Microcoleus</em> sequence variant matching the <em>Microcoleus anatoxicus</em> species with the presence of anatoxin-a derivatives and use long-read metagenomics to assemble complete circular genomes of the strain. The main dihydro-anatoxin-a-producing strain in the Areuse is distinct from strains isolated in New Zealand, the USA, and Canada, but forms a monophyletic strain cluster with them with average nucleotide identity values close to the species threshold. Compared to the rest of the <em>Microcoleus</em> genus, the toxin-producing strains encode a 15 % smaller genome, lacking genes for the synthesis of some essential vitamins. Toxigenic mats harbor a distinct microbiome dominated by proteobacteria and bacteroidetes, which may support cyanobacterial growth by providing them with essential nutrients. We recommend that strains closely related to <em>M. anatoxicus</em> be monitored internationally in order to help predict and mitigate similar cyanotoxic events.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000422/pdfft?md5=eb18715a6d82d0bde20f8e1a38f7fd7e&pid=1-s2.0-S2589914724000422-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142167331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of EPS subfractions from a mixed culture predominated by partial-denitrification functional bacteria","authors":"Jiapeng Li ,&nbsp;Yanxi Chen ,&nbsp;Ji Qi ,&nbsp;Xiaotian Zuo ,&nbsp;Fangang Meng","doi":"10.1016/j.wroa.2024.100250","DOIUrl":"10.1016/j.wroa.2024.100250","url":null,"abstract":"<div><p>Extracellular polymeric substances (EPS) play a crucial role in the aggregation of partial denitrification (PD) consortia, as EPS is closely linked to bioreactor performance. However, the structural and compositional properties of EPS from PD consortia have not yet been investigated. In this study, photometric measurements indicated that PD consortia contained significantly more EPS (168.81 ± 2.10 mg/g VSS) compared to conventional activated sludge (79.79 mg/g VSS). The EPS of PD consortia exhibited a significant predominance of proteins over polysaccharides, with a protein/polysaccharide ratio of 1.43 ± 0.10. FTIR analysis revealed that the EPS of PD consortia contained fewer hydrophilic functional groups, particularly carboxyl and carbonyl groups, indicating a high aggregation potential. The content comparison of EPS and functional groups across three stratified EPS subfractions from PD consortia consistently followed the sequence: TB-EPS &gt; LB-EPS &gt; S-EPS. XPS results corroborated the FTIR findings and the protein/polysaccharide ratio determined by photometric measurements, all of which suggested that the EPS of PD consortia exhibited a higher abundance of hydrophobic functional groups. However, the higher <em>α</em>-helix/(<em>β</em>-sheet + random coil) ratio (0.99) suggested that the proteins in PD consortia had a compact structure, making inner hydrophobic groups difficult to expose. This compact protein structure could limit aggregation among bacterial cells, indicating the need for process optimization to enhance sludge aggregation in PD-related processes. Overall, understanding the aggregation characteristics of PD consortia could improve the application of PD-based processes.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000409/pdfft?md5=848033b3debcec2f31baa28f52232967&pid=1-s2.0-S2589914724000409-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142099604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effectiveness of cyclic treatment of municipal wastewater by Tetradesmus obliquus – Loofah biofilm, its internal community changes and potential for resource utilization","authors":"Zhongqi He ,&nbsp;Xu Zhou ,&nbsp;Nannan Mei ,&nbsp;Wenbiao Jin ,&nbsp;Jing Sun ,&nbsp;Shiyu Yin ,&nbsp;Qilin Wang","doi":"10.1016/j.wroa.2024.100254","DOIUrl":"10.1016/j.wroa.2024.100254","url":null,"abstract":"<div><p>Microalgae biofilm has garnered significant attention from researchers in the field of sewage treatment due to its advantages such as ease of collection and stable sewage treatment capabilities. Using agricultural waste as biofilm carriers has become a hotspot in reducing costs for this method. This study first combined <em>Tetradesmus obliquus</em> with loofah to form a microalgae biofilm for the study of periodic nitrogen and phosphorus removal from municipal wastewater. The biofilm could stably treat 7 batches of wastewater within one month. The removal rate of TP almost reached 100 %, while the removal rates of NH₄⁺ and TN both reached or exceeded 80 %. The average biomass yield over 25 days was 102.04 mg/L/day. The polysaccharide content increased from 8.61 % to 16.98 % during the cyclic cultivation. The lipid content gradually decreased from 40.91 to 26.1 %. The protein content increased from 32.93 % in the initial stage to 41.18 % and then decreased to 36.31 % in the later stage. During the mid-stage of culturing, the richness of anaerobic bacteria decreased, while the richness of aerobic and facultative bacteria increased, which was conducive to the construction of the microalgae-bacteria symbiotic system and steadily improved the effect of nitrogen and phosphorus removal. As the culturing progressed, the <em>Rotifers</em> that emerged during the mid-stage gradually damaged the biofilm over time, leading to a decline in the effectiveness of sewage treatment in the later stages. This study offers technical support for carrier selection in microalgae biofilm methods and for the periodic removal of nitrogen and phosphorus from wastewater.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000446/pdfft?md5=db28541714455817b0064c918718c849&pid=1-s2.0-S2589914724000446-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142099605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating energy balance and environmental footprint of sludge management in BRICS countries","authors":"Zhenyao Wang ,&nbsp;Xuan Li ,&nbsp;Huan Liu ,&nbsp;Jinhua Mou ,&nbsp;Stuart J. Khan ,&nbsp;Carol Sze Ki Lin ,&nbsp;Qilin Wang","doi":"10.1016/j.wroa.2024.100255","DOIUrl":"10.1016/j.wroa.2024.100255","url":null,"abstract":"<div><p>Climate change is driving global endeavours to achieve carbon neutrality and renewable energy expansion. Sludge, a nutrient-rich waste, holds energy potential yet poses environmental challenges that need proper management. We conducted a comprehensive life cycle assessment to evaluate the energy balance and environmental footprint of the most commonly used sludge management scenarios in BRICS countries, namely Brazil, Russia, India, China, and South Africa. Technologies such as incineration and anaerobic digestion with energy recovery units (i.e., cogeneration unit) maximize energy balance and minimize the environmental footprint, with incineration showing a superior performance. Shifting sludge management scenarios from the worst to the best can boost energy production by 1.4–98.4 times and cut the environmental footprint by 1.5–21.4 times. In 2050, these improvements could lead to a 98-fold boost in energy generation and a 25-fold drop in carbon emissions, according to the Announced Pledges Scenarios. Optimizing parameters such as volatile solids and anaerobic digestion efficiency further boosts energy output and minimizes the environmental footprint. This study offers robust evidence to support sustainable sludge management and thus promote energy recovery and carbon neutrality goals, guide technological transitions, and inform policymaking for sustainable development.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":null,"pages":null},"PeriodicalIF":7.2,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000458/pdfft?md5=940b75993a91b13eea3c71d7900e1450&pid=1-s2.0-S2589914724000458-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}