Water Cycle最新文献

{"title":"Mitigation of PFOA/PFOS toxicity in zebrafish (Danio rerio) by oxidative stress modulation and gut microbial metabolism through the use of aquatic probiotic Lactobacillus rhamnosus","authors":"Chun Wang ,&nbsp;Guanyi Li ,&nbsp;Sibao Chen ,&nbsp;Ruixuan Li ,&nbsp;Mengyan Wang ,&nbsp;Xia Wang ,&nbsp;Ning Ding ,&nbsp;Yingxue Sun","doi":"10.1016/j.watcyc.2024.10.001","DOIUrl":"10.1016/j.watcyc.2024.10.001","url":null,"abstract":"<div><div>Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) have been classified as typical persistent organic pollutants (POPs), thus the residues and risks in the environment should not be underestimated. In order to ensure healthy aquaculture process and safe aquatic products, it is imperative to explore methods that can effectively mitigate the toxicity of PFOS and PFOA on fish. Research has demonstrated that <em>Lactobacillus rhamnosus</em> can ameliorate the toxic impacts induced by perfluorobutyric acid (PFBS) on zebrafish through regulation of host intestinal microbiota imbalance and enhancement of host antioxidant capacity. However, the potential ameliorative effects of probiotics on the toxic effects caused by PFOA and PFOS in zebrafish have not been studied. In this study, we conducted innovative research to examine the protective effects of <em>L. rhamnosus</em> against PFOA- and PFOS-induced oxidative damage, neurotoxicity, and disruption of intestinal microflora in adult zebrafish. The results demonstrated that <em>L. rhamnosus</em> effectively mitigated the oxidative stress induced by PFOA and PFOS in zebrafish through modulation of oxidative stress indicators (superoxide dismutase, SOD, lactate dehydrogenase, LDH, and catalase, CAT). The impact of PFOA and PFOS on intestinal tissue damage followed the order: PFOA + PFOS &gt; PFOS &gt; PFOA. Additionally, <em>L. rhamnosus</em> exhibited significant reparative effects on damaged intestinal tissues, as evidenced by the restoration of damaged intestinal villi and an increase in lymphocyte count. Furthermore, it was capable of enhancing the abundance of thick-walled phylum and actinomycetes phylum within the zebrafish gut microbiota. Notably, through the analysis of metabolic pathway differences, it was observed that the PFOA-exposure group exhibited a higher proportion of <em>Rhodococcus</em> in the PWY-7315 pathway, whereas <em>L. rhamnosus</em> mitigated this trend. These novel findings not only elucidate the mechanism by which <em>L. rhamnosus</em> efficiently reduces PFOS and PFOA toxicity in zebrafish but also provide a theoretical basis and practical recommendations for utilizing probiotics in aquaculture.</div></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"6 ","pages":"Pages 71-81"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of N loading on microbial community structure and nitrogen removal of an activated sludge process with long SRT for municipal wastewater treatment","authors":"Quan Yuan ,&nbsp;Yongjuan Du ,&nbsp;Song Chen ,&nbsp;Yikan Zhao ,&nbsp;Yuting Han ,&nbsp;Yuzhu Jiao ,&nbsp;Yingxue Sun","doi":"10.1016/j.watcyc.2024.09.002","DOIUrl":"10.1016/j.watcyc.2024.09.002","url":null,"abstract":"<div><div>Biological nutrient removal process is pivotal in controlling nitrogen and phosphorus from municipal wastewater treatment and reclamation plants in the water environment. The efficiency of municipal wastewater treatment is affected by the fluctuation of influent quality. In this study, the impact of N loading on the removal efficiency and the microbial community structure of activated sludge with long sludge retention time were investigated. The results showed that the effluent NH₄⁺-N and NO₂⁻-N concentration were lower than 0.5 mg/L, and the TN removal efficiencies were 79.77 % and 65.80 %, respectively. The dehydrogenase activity, specific oxygen uptake rate, specific nitrification rate, and specific denitrification rate increased as the N loading increasing. At the phylum level, the most dominant bacterial was affiliated with Proteobacteria in the two systems, accounting for 60.65 % and 48.62 %, respectively. At the genus level, <em>Acinetobacter</em>, <em>Thauera</em>, and <em>Zoogloea</em> played significant roles in denitrification. The ammonia oxidation bacteria and nitrite-oxidizing bacteria were of the genus <em>Nitrosomonas</em> (r-strategist) and <em>Nitrospira</em> (K-strategist).</div></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"6 ","pages":"Pages 28-35"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143105073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water quality characteristics of municipal wastewater treatment plants and the prospect of reclaimed water utilization in lower-middle income and water-scarce areas: A case study of Puyang","authors":"Yutong Duan ,&nbsp;Hongbo Xi ,&nbsp;Zhikai Qin ,&nbsp;Ruili Guo ,&nbsp;Fang Wang ,&nbsp;Yue Yuan","doi":"10.1016/j.watcyc.2024.11.002","DOIUrl":"10.1016/j.watcyc.2024.11.002","url":null,"abstract":"<div><div>Water scarcity is a key bottleneck for China's economic and social development. Reclaimed water presents a sustainable solution, but its utilization remains limited, especially in lower-middle income cities like Puyang. This study investigates the potential for reclaimed water utilization in Puyang, a key industrial hub in the Central Plains Economic Zone facing severe water shortages. Operational data from 20 municipal wastewater treatment plants (WWTPs) in 2023 were analyzed to assess water quality parameters, treatment efficiencies, and hydraulic load rates. Results indicate the seasonal variation in hydraulic load rates, probably affected by heavy rainfall during the rainy season, which posed operational challenges for WWTPs. Influent water quality analysis showed high concentrations of COD, NH₃-N, TN, and TP, and nutrient ratios that often exceeded the optimal level for biological nutrient removal. Effluent water quality generally met the discharge standards, though TN removal efficiency was unsatisfactory in some cases. The study also explored the future potential of reclaimed water in Puyang, highlighting opportunities to increase utilization rates to 30% by 2025 through enhanced infrastructure and technological innovations. Environmental assessments confirmed that treated water met industrial and landscape irrigation standards, while social and economic analyses showed that cost-effective water reuse offered advantages over other unconventional water sources. However, challenges such as inadequate regulatory frameworks, limited infrastructure and the need for systematic planning have hampered progress. This study provides a comprehensive evaluation of reclaimed water utilization in Puyang, offering valuable insights for sustainable water resource management in similar regions.</div></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"6 ","pages":"Pages 61-70"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel magnetically recoverable MnFe2O4/TiO2 nanocomposites synthesized using green route for photocatalytic degradation of methylene blue","authors":"Deska Lismawenning Puspitarum ,&nbsp;Nurul Imani Istiqomah ,&nbsp;Dyah Ayu Larasati ,&nbsp;Nining Sumawati Asri ,&nbsp;Julia Angel ,&nbsp;Ahmad Kusumaatmaja ,&nbsp;Edi Suharyadi","doi":"10.1016/j.watcyc.2024.11.001","DOIUrl":"10.1016/j.watcyc.2024.11.001","url":null,"abstract":"<div><div>The photocatalytic degradation of hazardous organic dyes was investigated using green-produced MnFe₂O₄/TiO₂ nanocomposites, which demonstrated magnetic reusability and separability, making them efficient photocatalysts for rapid UV degradation. The MnFe₂O₄/TiO₂ diffraction peaks indicated a single-phase cubic spinel structure, with crystallite sizes spanning from 5.3 to 7.1 nm. The TiO₂ anatase phase showed typical peaks at 25.8° and 48.2°, corresponding to the (110) and (200) diffraction planes, respectively. The transmission electron microscopy image of MnFe₂O₄/TiO₂ revealed inter-grain aggregation between the particles. The particle size of MnFe₂O₄/TiO₂ exhibited a slight increase from 30 to 40 nm. MnFe₂O₄ appeared as black spheres, whereas TiO₂ appeared as grey circles. X-ray spectroscopy confirmed the matching of chemical elements. The bandgap of the nanocomposites decreased from 2.9 to 3.2 eV after the surface treatment with TiO₂, indicating an electronic transition between the two components. Furthermore, the addition of TiO₂ affected the saturation magnetization, which ranged from 7.6 to 11.2 emu/g. The nanocomposites clearly displayed superparamagnetic-like behavior. A photocatalytic investigation showed that MnFe₂O₄/TiO₂ nanoparticles exhibited higher photocatalytic activity than MnFe₂O₄ nanoparticles. Methylene blue dye was degraded by 98 % using the MnFe₂O₄/TiO₂ nanocomposites after 2 h of UV exposure. This photodegradation was further investigated using a Langmuir–Hinshelwood kinetic model, and it was discovered that the rate constant (<em>K</em>_<em>app</em>) increased with the TiO₂ concentration. The nanocomposites maintained over 90 % photocatalytic efficiency without any significant degradation after three reuse cycles. Therefore, green-synthesized MnFe₂O₄/TiO₂ nanocomposite photocatalysts for dye degradation are highly promising for the removal of harmful organic dyes from the environment.</div></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"6 ","pages":"Pages 49-60"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143105075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of GIS-based multi-criteria decision analysis of hydro-geomorphological factors for flash flood susceptibility mapping in Bangladesh","authors":"Raihan Riaz ,&nbsp;Md. Mohiuddin","doi":"10.1016/j.watcyc.2024.09.003","DOIUrl":"10.1016/j.watcyc.2024.09.003","url":null,"abstract":"<div><div>Flash floods are one of the most prevalent natural disasters, triggering deadly damage to homesteads, crops, infrastructure, road networks, communications, and the natural environment in the <em>Haor</em> (Wetland) region of Bangladesh. The purpose of the study aims to identify eleven (11) hydro-geomorphological driving factors, namely elevation, slope, aspect, rainfall, land use and land cover (LULC), lithology, soil type, topographic wetness index (TWI), Normalized Difference Vegetation Index (NDVI), distance from the river, and drainage density, which are being explored for mapping flood-prone areas. This research has produced a flash flood susceptibility map using the Analytical Hierarchy Process (AHP) and Analytical Network Process (ANP), which are interactive decision-making approaches under multi-criteria decision analysis (MCDA) in ArcGIS 10.8. The findings of this study showed that the susceptibility to flood hazards differs significantly among the seven <em>Haor</em> districts. As a result of the ANP and AHP, a more significant proportion of the <em>Haor</em> region is moderately susceptible to flooding (8685.09–9275.15 sq. km.), whereas 35.34 %–38.32 % (7069.70–7668.67 sq. km.) accounts for high susceptible to flooding. Furthermore, 200 flood locations were identified in the northeast Haor region, where 140 (70 %) randomly selected floods were used for training, and the remaining 60 (30 %) were employed for validation purposes. The validation results showed that the AHP model had greater prediction accuracy (the area under the receiver operating curve (AUROC) = 92.1 %) than the ANP (AUROC = 88.5 %) model. Therefore, the study findings can be helpful for researchers, academics, policymakers, and planners for sustainable flood mitigation strategies, particularly in <em>Haor</em> areas.</div></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"6 ","pages":"Pages 13-27"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143105072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance and application of PS slow-release algal inhibition materials based on modified fly ash and cement","authors":"Zhaoliang Zhu ,&nbsp;Xinyu Ji ,&nbsp;Bingfang Shi ,&nbsp;Yonggang Li ,&nbsp;Ning Guo","doi":"10.1016/j.watcyc.2024.01.001","DOIUrl":"https://doi.org/10.1016/j.watcyc.2024.01.001","url":null,"abstract":"<div><p>In this paper, a new type of slow-release algae control agent was prepared by using modified fly ash and cement as the base material and PS (potassium persulfate), an inorganic substance that dissolves algae by destroying their cellular structure, as the active component, and compounding the three in a certain proportion, and the finished product was obtained after 14 days of maintenance. The rate of release is primarily influenced by temperature, particle size, and load, while pH has minimal impact. Specifically, as the temperature increases from 4 °C to 40 °C, the rate of slow release increases from 0.74 mg/g/d to 1.35 mg/g/d. When particle size increased from 3 mm to 5 mm, the slow-release rate decreased from 1.06 mg/g/d to 0.70 mg/g/d. When the load increased from 10 mg/g to 30 mg/g, the slow-release rate also increased from 0.60 mg/g/d to 2.10 mg/g/d. In the algal inhibition experiment, the composite material was selected with a dose of 20 g/L, a loading capacity of 15 mg/g, and a particle size of 3 mm. After 14 days, algae removal rates, ammonia nitrogen, total phosphorus, and COD were found to be 96.55 %, 56.14 %, 78.2 %, and 86.81 %, respectively. The microstructure, elemental composition, and distribution of functional groups in the materials were analyzed using SEM, EDS, and FTIR. The algal suppressor was evenly distributed throughout the substrate surface. Additionally, there was a decrease in metal elements and an increase in hydroxyl groups. The experimental data show that the material is a slow-release algal inhibitor with good performance and practical application value.</p></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"5 ","pages":"Pages 9-19"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666445324000011/pdfft?md5=19bf18d648dff02861fe2c0c78d8520e&pid=1-s2.0-S2666445324000011-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139548746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A selection guide for efficient graphene oxide-composite adsorbents","authors":"Jafar I. Abdelghani ,&nbsp;Fawwaz I. Khalili ,&nbsp;Nabil N. AL-Hashimi ,&nbsp;Amjad H. El-Sheikh ,&nbsp;Moayad A. Khwara","doi":"10.1016/j.watcyc.2024.06.001","DOIUrl":"10.1016/j.watcyc.2024.06.001","url":null,"abstract":"<div><p>Many adsorbents for various pollutants are now being developed, especially after the great developments in the nanotechnology. Therefore, there is an urgent need to develop a guide for selecting the most appropriate adsorbent from a practical standpoint. In fact, relying on the magnitude of adsorption capacity alone is not sufficient to decide the usability of an adsorbent in real applications. Based on this, a selection guide has been proposed to choose the most appropriate adsorbent based not only on the adsorption capacity but also on the other factors related to the batch process. This guide was proposed based on the exceptional performance of graphene oxide and graphene oxide composites (<em>Q</em>_max &gt;1000 mg/g) to sequestrate textile dyes, as evidenced by the recent literature. To create the guide, 74 graphene oxide-based adsorbents with high retention for 36 dyes of different classes were examined. The collected GO-adsorbents were classed into four groups according to the added substrates. From the experimental results, the guide's criteria for selecting the most practical adsorbent were set as follows: adsorption capacity ≥684 mg/g, solid to liquid ratio ≤0.9 g/L, equilibrium time ≤70 min, pH 10.0 for cationic dyes and 5.5 for anionic dyes, recyclability ≥5 cycles with a final efficiency ≥90 %, and ease recovery from solution by an external magnet or decantation. Based on the guide, the winner GO-adsorbents were tetrazolyl-octadecylamine-GO, polyethylenimine-polyvinyl alcohol-GO, and Fe₃O₄-triethylenetetramine-β-cyclodextrin-GO as they fulfill most of suggested criteria. Although the proposed guide was created for graphene oxide-dye system, similar guides for other systems would be created following the outlined strategy.</p></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"5 ","pages":"Pages 234-246"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666445324000205/pdfft?md5=996587fdfe8b978aad2dd7c1b79e9f93&pid=1-s2.0-S2666445324000205-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141990464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent advances in treatment refinement of kitchen digested wastewater: Feasibility, prospects, and technicalities","authors":"Weiwei Li ,&nbsp;Hong Liu ,&nbsp;Le Deng ,&nbsp;Yonghui Zhang ,&nbsp;Yanhong Ma ,&nbsp;Yongzhi Chen","doi":"10.1016/j.watcyc.2023.12.001","DOIUrl":"10.1016/j.watcyc.2023.12.001","url":null,"abstract":"<div><p>Kitchen digested wastewater contain high levels of nitrogen, chemical oxygen demand (COD), salts, toxic substances, and oils and the treatment of these pollutants is a challenge for wastewater treatment plant. Our goal was to analyze the feasibility of removing pollutants such as high concentrations of organic matter, ammonia, phosphorus, and oils using a proven new process for treating urban wastewater. The novel process was capable of achieving efficient nitrogen and phosphorus removal and the harmless treatment of kitchen digested wastewater. Based on the characteristics of kitchen digested wastewater and a successful treatment process, improved multi-stage anoxic/aerobic (A/O) technology, anaerobic/aerobic/anoxic (AOA) technology, mainstream anaerobic ammonia oxidation (Anammox) technology process theory and application characteristics were introduced in detail. The feasibility of biological deep nitrogen and phosphorus removal was analyzed. The new technology was applied to the fine treatment of kitchen digested wastewater, realizing the participation of multiple systems, enhancing nitrogen migration and transformation pathways, and realizing efficient nitrogen removal, and phosphorus and carbon removal. Meanwhile, the toxic components were analyzed and reduced to achieve harmless effluent and resource utilization.</p></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"5 ","pages":"Pages 20-30"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666445323000338/pdfft?md5=b4f14033ecef9ac4541d7b784e51e7d3&pid=1-s2.0-S2666445323000338-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139018337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short-time aerobic digestion treatment of waste activated sludge to enhance EPS production and sludge dewatering performance by changing microbial communities: The impact of temperature","authors":"Yating Chen ,&nbsp;Ying Liu ,&nbsp;Jiayang Lv ,&nbsp;Dongdong Wu ,&nbsp;Li Jiang ,&nbsp;Wenzhou Lv","doi":"10.1016/j.watcyc.2024.04.003","DOIUrl":"https://doi.org/10.1016/j.watcyc.2024.04.003","url":null,"abstract":"<div><p>Short-time aerobic digestion (STAD) of sludge requires low investment and has the advantages of short sludge retention time and rapid degradation of organic matter in waste activated sludge (WAS). This research conducted STAD at three temperature gradients (15 °C, 25 °C, and 35 °C). Characteristics of EPS and microbial community structure of raw and fermented sludge were analyzed, and environmental application potential of STAD at different temperatures was explored. STAD treatment improved both polysaccharide (PS) and protein (PN) contents in EPS, with increases of 5.7–18.35 % and 20.98–28.57 %, respectively. Aromatic protein-like substances (Peak E) and tryptophan protein substances (Peak F) were main components of PN in EPS. The microbial species richness decreased as the STAD temperature increased. At the class level, STAD temperature significantly affected <em>Alphaproteobacteria</em>, <em>Gemm-1</em>, <em>Chloracidobacteria</em>, <em>Acidimicrobiia</em>, <em>Ellin6529</em>, <em>Betaproteobacteria</em>, and <em>SJA-28</em>. From an application perspective, the specific resistance to filtration (SRF) value of WAS after STAD treatment at 35 °C was decreased to 7.01 × 10⁷ m/kg with a 17.34 % reduction, indicating improvement in the dewaterability of the sludge. The Pb²⁺ adsorption efficiency per unit volume of EPS increased by 10.0–16.2 % after STAD treatment of WAS at different temperatures for 4 h. This research elucidated the impact of temperature on WAS in STAD systems, finding that microbial abundance correlated with EPS characteristics. The research results provide a basis for optimizing the system temperatures in STAD systems and a deeper understanding of the benefits of STAD in practical applications for sludge resource utilization.</p></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"5 ","pages":"Pages 146-155"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666445324000151/pdfft?md5=b106e91163080111d266ecffce277641&pid=1-s2.0-S2666445324000151-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140645270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of organic pollution in the Dianchi Caohai Lake at the transition between the dry and rainy seasons","authors":"Hongfa Guo ,&nbsp;Zhuo Chen ,&nbsp;Han Yan ,&nbsp;Ao Xu ,&nbsp;Fengmin Li","doi":"10.1016/j.watcyc.2024.02.001","DOIUrl":"https://doi.org/10.1016/j.watcyc.2024.02.001","url":null,"abstract":"<div><p>Dianchi Caohai Lake is heavily polluted, and a significant increase in chemical oxygen demand (COD) occurs during the transition from the dry season to the rainy season. In order to analyze the cause of COD increase, the compositional characteristics of organic matter were investigated using three-dimensional fluorescence spectroscopy technology. The results showed that the most polluted area was located in the geographic center of the outer Caohai Lake, where COD reached 29 mg/L and was elevated by 52%, and protein-like and humus-like features were evident in the organic matter fractions. By measuring the characteristics of water in Caohai Lake, it was found that the fluorescence indexes were greater than 2.47, the biological index was distributed between 0.67 and 1.06, and the humification index was distributed between 1.81 and 3.12. It indicated that the lake had low humification and showed strong autochthonous source characteristics. The bloom outbreak was one of the main reasons for the elevated COD concentration. This study will provide theoretical support for the control of organic pollution in Dianchi Lake.</p></div>","PeriodicalId":34143,"journal":{"name":"Water Cycle","volume":"5 ","pages":"Pages 31-36"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666445324000035/pdfft?md5=1ffe2db0ee6d8bf90b86e3b668c278ea&pid=1-s2.0-S2666445324000035-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139738124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}