Spatial-temporal distribution and evolutionary characteristics of water environment sudden pollution incidents in China from 2006 to 2018

Xu, Jing; Xu, Min; Zhao, Yanxin; Wang, Shaofei; Tao, Minghui; Wang, Yonggui

doi:10.1016/j.scitotenv.2021.149677

Cited by 28 publications

(29 citation statements)

References 24 publications

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“…Water pollutions caused by illegal discharge and water diversion projects in lakes and rivers have paid much attention in China . The cause of pollution in water is complicated, and eutrophication and heavy metal pollution may coexist in some local areas (e.g., Pearl River, China and Flensburg Fjord, Germany). , Because of the higher selectivity and adsorption capacity of Mg-SLBC, it was selected to simultaneously remove phosphate and heavy metal ions in binary solutions. The results showed that phosphate adsorption by Mg-SLBC was unaffected by metal ions, and the adsorption curves remained unchanged (Figure e).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Phosphate Adsorption by Mg-Stirred Leaf Biochar in a Complex Water Matrix via Active MgO Facet Exposure

et al. 2022

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In phosphate adsorption, the interaction between MgO and the carbon network in Mg-biochar is an overlooked factor that contributes to active MgO facet generation for enhancing phosphate adsorption. However, the complex water matrix adsorption mechanism underlying the adaptability of MgO-biochar and enhanced phosphate adsorption are not fully studied. Herein, Mg-stirred leaf biochar (Mg-SLBC) was prepared by the Mg-stirring modification method. Mg-SLBC possessed the highest adsorption capacity (79.28 mg g–1) to phosphate among the adsorbents. In addition, Mg-SLBC had a good performance for phosphate adsorption in a complex water matrix. Phosphate adsorption by Mg-SLBC was not affected by Cl–, NO3 –, SO4 2–, humic acid, metal ions, and Ca2+ but was inhibited by Mg2+ and HCO3 –. For long-term adsorption, Mg-SLBC could constantly adsorb phosphate to avoid phosphate accumulation (<2 mg L–1). Meanwhile, phosphate adsorption by Mg-SLBC was a spontaneous process (ΔG, −6.884 kJ mol–1), which was dominated by inner-sphere complexation. Owing to high combination between MgO and the carbon network, there were more active MgO facets (e.g., (1 1 0) and (2 0 0)) to induce stronger unbalanced electron distribution in Mg-SLBC. Thereby, Mg-SLBC, with high adsorption capacity and adaptability, could effectively adsorb phosphate in a complex water matrix.

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Section: Resultsmentioning

confidence: 99%

Enhanced Phosphate Adsorption by Mg-Stirred Leaf Biochar in a Complex Water Matrix via Active MgO Facet Exposure

et al. 2022

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“…Water pollution has been a challenging issue in recent years due to an increasing oil spill accidents and industrial destroy incidents. , Oil/water separation, especially oil-in-water emulsion separation, has attracted a growing attention around the world. , Due to their supermacroporosity of cryogels, several types of cryogels, including rubber-graphite-based and polymethacrylate-based cryogels, − have successfully been applied in rapid separation of the oil/water mixture. In our previous study, the composite cryogels based on polyethylene glycol incorporated with hydrophobic polydivinyl benzene particles displayed high separation efficiency for the surfactant-stabilized oil-in-water emulsions .…”

Section: Introductionmentioning

confidence: 99%

“…Water pollution has been a challenging issue in recent years due to an increasing oil spill accidents and industrial destroy incidents. 32,33 Oil/water separation, especially oil-in-water emulsion separation, has attracted a growing attention around the world. 34,35 Due to their supermacroporosity of cryogels, several types of cryogels, including rubber-graphite-based 36 and polymethacrylate-based cryogels, 37−39 have successfully been applied in rapid separation of the oil/water mixture.…”

Section: Introductionmentioning

confidence: 99%

Superamphiphilic Chitosan Cryogels for Continuous Flow Separation of Oil-In-Water Emulsions

et al. 2022

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Chitosan is a typical hydrophilic biomass building block widely used in material science and engineering. However, its intrinsic amphiphilicity has been seldom noted so far. Herein, a series of glutaraldehyde-crosslinked chitosan cryogels with superamphiphilicity are fabricated at moderately frozen conditions through a freezing−thawing process. The micron-sized porous cryogel samples display a 0°contact angle toward both water and oil, 0°water contact angle under oil, and over 120°oil contact angle underwater. By comparing the wetting behavior of the tablet compressed by pure chitosan powders, the superamphiphilicity of the chitosan sample is proven to be independent on crosslinkers. This special wettability endows the chitosan cryogels with high separation efficiency for various surfactant-stabilized oil-in-water emulsions under continuous flow mode driven by gravity as well as a peristaltic pump.

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“…Water deterioration has also become a public urgent concern worldwide and a serious threat to people’s livelihoods 3 , 4 . Taking China for illustration, there were 874 records of local water contamination during 2006 ~ 2016, resulting in great troubles for domestic life and making millions of economic loss 5 . Reasonable evaluation of water quality variation has been demonstrated as a practical tool for water quality warning and protection 6 – 8 .…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal variation evaluation of water quality in middle and lower Han River, China

Deng

Chen

Liu

et al. 2022

Sci Rep

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As the water source for the middle route of the South-to-North Water Transfer Project, the Han River in China plays a role of the world’s largest inter-basin water transfer project. However, this human-interfered area has suffered from over-standard pollution emission and water blooms in recent years, which necessitates urgent awareness at both national and provincial scales. To perform a comprehensive analysis of the water quality condition of this study area, we apply both the water quality index (WQI) and minimal WQI (WQImin) methods to investigate the spatiotemporal variation characteristics of water quality. The results show that 8 parameters consisting of permanganate index (PI), chemical oxygen demand (COD), total phosphorus (TP), fluoride (F-), arsenic (As), plumbum (Pb), copper (Cu), and zinc (Zn) have significant discrepancy in spatial scales, and the study basin also has a seasonal variation pattern with the lowest WQI values in summer and autumn. Moreover, compared to the traditional WQI, the WQImin model, with the assistance of stepwise linear regression analysis, could exhibit more accurate explanation with the coefficient of determination (R2) and percentage error (PE) values being 0.895 and 5.515%, respectively. The proposed framework is of great importance to improve the spatiotemporal recognition of water quality patterns and further helps develop efficient water management strategies at a reduced cost.

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Spatial-temporal distribution and evolutionary characteristics of water environment sudden pollution incidents in China from 2006 to 2018

Cited by 28 publications

References 24 publications

Enhanced Phosphate Adsorption by Mg-Stirred Leaf Biochar in a Complex Water Matrix via Active MgO Facet Exposure

Enhanced Phosphate Adsorption by Mg-Stirred Leaf Biochar in a Complex Water Matrix via Active MgO Facet Exposure

Superamphiphilic Chitosan Cryogels for Continuous Flow Separation of Oil-In-Water Emulsions

Spatiotemporal variation evaluation of water quality in middle and lower Han River, China

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