Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jianing Xiu,Ziyong Ow,Yuning Zhao,Xiaohui Bai
Urban rivers or water bodies play an important role in improving the ecological environment. However, many of them are turbid and uncomfortable. In this study, five species of microalgae were isolated from different natural water and used to find their growth potential, flocculation ability, turbidity and nutrient removal ability and the flocculation mechanisms were investigated. The results showed that, three microalgae species, namely, Ankistrodesmus sp. WZ3A4, Coelastrella tenuitheca W6D5, Chlorella sorokiniana W6A3 can efficiently reduce the turbidity in natural water. Optical microscope and SEM observations revealed that they can attach the suspended particles to form flocs and display high turbidity-removal efficiencies (TRE) of 74.7 %, 82.6 %, 93.8 % respectively in natural turbid water. Chlorella sorokiniana W6A3 can even reduce the turbidity from 60.3 NTU to 3.73 NTU. Through EPS component analysis, TRE changes and surface characteristics before and after EPS extraction, Fourier transform infrared (FTIR) spectrum analysis, we found that the high turbidity-removal efficiency of these microalgae species was not closely related to charge neutralization, but greatly associated with the tightly bound EPS and the high relative hydrophobicity. Hydrophobic interaction and the adhesion of extracellular macromolecular polysaccharides have important effects on the flocculation of microalgae in natural turbid water. FTIR showed that microalgae with higher turbidity-removal efficiencies all had stronger stretching vibration near 1135 cm −1 . This study demonstrates that light-driven self-flocculating microalgae can clarify natural turbid water while converting atmospheric carbon dioxide into living biomass through light energy and proposes a novel and carbon-negative technology for restoring urban turbid water environments.
研究领域:
环境科学
·
微生物学
·
水处理
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yuanzhen He,Hui Jin,Han Gao,Guoqing Zhang,Feng Ju
The widely used antidiabetic drug metformin has become an emerging contaminant of water systems. In a prior study, we demonstrated the marked mammalian toxicity of the disinfection-derived byproducts (DBPs) Y ( y ellow, C 4 H 6 ClN 5 ) and C ( c olorless, C 4 H 6 ClN 3 ), and here assess the distribution, formation, and ecotoxicity of these in Chinese urban water systems. A national tap water assessment showed that metformin and C concentrations were higher in large, dense urban areas and surface water sources than in sparsely populated areas and groundwater sources. Water types' analysis clearly showed that C derived from chlorination of metformin-contaminated water (up to 4308.5 ng/L) circulated from domestic water (0.7–9.7 ng/L) via sewage (2.3 ng/L in effluent) to surface water (0.6–3.5 ng/L). Simulated disinfection and aqueous stability results systematically showed rapid formation and 24 h stability of both byproducts, indicating high exposure odds for water users. Both byproducts showed clear but distinct toxic effects on the growth (72 h IC 50 , 0.6 mg/L for Y and 4.4 mg/L for C) and photosynthesis of the microalgae Pseudokirchneriella subcapitata at milligram levels. Combinedly, our work reveals that metformin byproducts have been disseminated to urban water cycle and contaminated tap water, increasing potential toxic risk for drinking water . Its outcomes provide a preliminary reference for future studies on the environmental fate and ecotoxicological effects of unintended DBPs formed in the chlorination of metformin-contaminated water.
研究领域:
环境科学
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毒理学
·
药理学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Yulong Yang,Zhanghua Liu,Huiming Zheng,Shicui Zhu,Kejia Zhang,Xueyan Li,Xiaoyan Ma,Andrea M. Dietrich
As a globally important artificial sweetener, sucralose (SUC) is a persistent emerging contaminant in global aquatic environments. This research comprehensively track the fate and transport of SUC throughout an urban water cycle; to perform laboratory experiments to determine chlorinated disinfection by-products (DBPs) of SUC sebsequent to advanced oxidation with ozone; and to perform a risk evaluation of SUC related DBPs.; The results demonstrated that SUC was consistently present throughout the urban water cycle, including consumer's tap water . The inluent to the municipal wastewater treatment plant contained 1033.4-2626.3 ng/L SUC, and as expected for this non-biodegradable artificial sweetener, the concentration in the effluent was slightly reduced to 917.6-2031.2 ng/L. The concentration of SUC varied in surface waters with a peak value of 2070.0 ng/L. In finished drinking water 288.1–505.3 ng/L SUC was found, and values of 177.7–409.7 ng/L were present in the distribution system. Up to 16.3% of SUC concentration discharged as municipal wastewater was delivered to residents in their drinking water . While conventional treatment little removed SUC, the mean removal efficiency of SUC with ozonation followed by activated carbon filtration was 39.6% at a full-scale drinking water treatment plant. The fate and transformation of SUC in drinking water treated by ozonation and chlorination were investigated in laboratory experiments. Ozonation partially degraded SUC; however, intermediates reacted with chlorine to generate DBPs, including trichloromethane (TCM), dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA). Peak 7-days potential formation of TCM, DCAA and TCAA were 0.016, 0.51 and 23.34 μ g/mg SUC, respectively. DBP yields increased with increasing chlorine dosage, chlorination time, temperature, and solution pH. The presence of ammonia nitrogen in water facilitated dichloroacetonitrile (DCAN) production up to 0.78 μ g/mg SUC, while simultaneously reducing the yield of TCM, DCAA and TCAA. Human exposure analysis revealed that carcinogenic risks of DBPs caused only by SUC ozonation were in the range of 1.86 × 10 −12 -6.12 × 10 −9 , while non-carcinogenic risks were in the range of 6.0 × 10 −9 -4.37 × 10 −6 . The pervasive occurrence of SUC in an urban water cycle, couple to its resistance to biological and chemical treatment, confirms that SUC is a persistent contaminant in the aquatic system, including tap water .
研究领域:
环境科学
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公共卫生
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MASS SPECTROMETRY
·
2022
·Vol. 57
·期 2
·e4809
·
IF 2.394
Gaosheng Zhao,Fengjian Chu,Jianguang Zhou
A direct analytical method based on dual ambient plasma ion source tandem mass spectrometry was used for the simultaneous determination of four sterols in the environment. This technology has very high sensitivity and the method detects the four sterols in methanol–water (1:3) solutions with limits of detection (LOD) and limits of quantification (LOQ) ranging from 1.2 ng/L to 6.9 ng/L and 7.6 ng/L to 10.0 ng/L, respectively. The method was also used to test water quality at three locations within the city and successfully detected all four sterols at very low concentrations. The dual plasma source tandem mass spectrometry technique is extremely simple, rapid, sensitive and highly efficient compared to other traditional methods, providing a useful screening tool for sterols in water.
研究领域:
环境科学
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分析化学
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水质监测
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yuejiao Yang,Xitian Peng,Guiyou Chen,Huaming Xiao,Qiongwei Yu
Perfluorinated compounds (PFCs) are persistent in urban water systems, threatening the safety of drinking water and aquatic food chains. In this study, fluorinated loofah sponge (FLS) was prepared for selective solid-phase extraction (SPE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) determination of 16 PFCs in urban water. The limits of detection (LODs) and limits of quantification (LOQs) of the established method (FLS-based SPE-LC-MS/MS) were 0.006–5 ng/mL and 0.01–10 ng/mL, respectively. This method exhibited a desirable precision with relative standard deviations (RSDs) less than 8.83 % and recoveries in the range of 85.4 %–107.2 %. Finally, this method was successfully applied to investigate the distribution of 16 PFCs in real urban water samples (such as tap water, bottled water, and lake water) collected in Wuhan, China, which enables sensitive dynamic monitoring of PFC migration in urban water networks and identification of potential sources so as to safeguard drinking water quality against emerging PFC contamination.
研究领域:
环境分析化学
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环境污染与控制
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水质安全
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分析化学
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环境健康
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Kai Yang,Qing-Lin Chen,Mo-Lian Chen,Hong-Zhe Li,Hu Liao,Qiang Pu,Yong-Guan Zhu,Li Cui
The increasing and simultaneous pollution of plastic debris and antibiotic resistance in aquatic environments makes plastisphere a great health concern. However, the development process of antibiotic resistome in the plastisphere is largely unknown, impeding risk assessment associated with plastics. Here, we profiled the temporal dynamics of antibiotic resistance genes (ARGs), mobile genetic elements (MGEs), and microbial composition in the plastisphere from initial microbial colonization to biofilm formation in urban water. A total of 82 ARGs, 12 MGEs, and 63 bacterial pathogens were detected in the plastisphere and categorized as the pioneering, intermediate, and persistent ones. The high number of five MGEs and six ARGs persistently detected in the whole microbial colonization process was regarded as a major concern because of their potential role in disseminating antibiotic resistance. In addition to genomic analysis, D2O-labeled single-cell Raman spectroscopy was employed to interrogate the ecophysiology of plastisphere in a culture-independent way and demonstrated that the plastisphere was inherently more tolerant to antibiotics than bacterioplankton. Finally, by combining persistent MGEs, intensified colonization of pathogenic bacteria, increased tolerance to antibiotic, and potential trophic transfer into a holistic risk analysis, the plastisphere was indicated to constitute a hot spot to acquire and spread antibiotic resistance and impose a long-term risk to ecosystems and human health. These findings provide important insights into the antibiotic resistome and ecological risk of the plastisphere and highlight the necessity for comprehensive surveillance of plastisphere.
研究领域:
环境科学
·
微生物学
·
基因组学
·
公共健康
✓ 已验证
DOI
PubMed
高影响因子
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