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A comprehensive study of treatment of arsenic in water combining oxidation,coagulation,and filtration

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Journal of Environmental Sciences 2015年第10期27卷 178-180页

作者： Terracciano Amalia Ge Jie meng xiaoguang Center for Environmental Engineering Stevens Institute of Technology

Arsenic is one of the most common inorganic contaminants in groundwater worldwide,mainly due to the release of naturally occurring arsenic from aquifer sediments（Amini et al.,2008;Li and Cai,2015;Rahman et al.,2015）... 详细信息

关键词： arsenic coagulation filtration predominantly ferric inorganic hydroxide groundwater remove adsorbed

Adsorption and recovery of phosphate from water by amine fiber,effects of co-existing ions and column filtration

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Journal of Environmental Sciences 2020年第1期32卷 123-132页

作者： Jinshan Wei xiaoguang meng Xianghua Wen Yonghui Song School of Environment Tsinghua UniversityBeijing 100084China Center for Environmental Systems Stevens Institute of TechnologyHobokenNJ 07030USA State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China

A weak-base adsorption fiber,acrylic amine fiber(AAF),was prepared for removal and recovery of phosphate from *** adsorption properties of the AAF for phosphate and effects of co-existing ions were investigated using batch and column filtration experiments,scanning electron microscope,and Fourier transform infrared *** results showed that AAF had a high phosphate adsorption capacity of 119 mg/g at pH *** effects of calcium,sulfate,carbonate,nitrate,and fluoride showed that sulfate and calcium inhibited phosphate ***,AAF showed higher binding affinity toward phosphate than *** filtration results showed that AAF could filter 1420 bed volumes of tap water containing 1.0 mg-P/L of *** saturated AAF could be regenerated using 0.5 mol/L hydrochloric acid solution and *** desorption,phosphate was recovered through precipitation of hydroxyapatite(Ca5(PO4)3OH).The easy of regeneration,good adsorption performance,and the fiber morphology of AAF make it an attractive alternative for phosphate recovery from multiple water sources.

关键词： Wastewater treatment Phosphate removal Adsorption Acrylic amine fiber Phosphorus recovery

Effect of phosphate releasing in activated sludge on phosphorus removal from municipal wastewater

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Journal of Environmental Sciences 2018年第5期30卷 216-223页

作者： Jie Ge xiaoguang meng Yonghui Song Amalia Terracciano Center of Environmental Systems Stevens Institute of Technology State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences

Aluminum and ferric salts are commonly used in municipal wastewater treatment plants（WWPTs） for phosphorus（P） removal. In this study, on-site jar tests were conducted to determine the removal of different P species from the fresh samples in the presence and absence of activated sludge（AS） with different doses of alum, poly-aluminum chloride,and ferric chloride at different p H. The soluble P（SP） concentration in the samples was about 0.63 mg/L. When the mixed liquor containing AS was treated with 8 mg/L of Al, SP could be reduced to 0.13 mg/L, while it was reduced to 0.16 mg/L with only 1 mg/L of Al after sedimentation removal of AS from sample. Chemical analysis determined that AS contained 59.8 mg-P/g-TSS and 43.8 mg-Al/g-TSS and most of the P was associated with the aluminum hydroxide. We discovered that the phosphate in the AS could readily be released from it, which was mainly responsible for ineffective removal of P to low levels in mixed liquor even with very high alum dose. This study provides new insight into the behavior and fate of P in the wastewater treatment plants that use alum to enhance P removal in the final effluent.

关键词： Phosphorus release Coagulation Activated sludge (AS) Wastewater treatment

Fluoride removal by Al,Ti,and Fe hydroxides and coexisting ion effect

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Journal of Environmental Sciences 2017年第7期29卷 190-195页

作者： Jianfeng Zhang Timothy E.Brutus Jiemin Cheng xiaoguang meng School of Environmental and Municipal Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Center for Environmental Systems Stevens Institute of TechnologyHobokenNJ 07030USA College of Geography and Environment Shandong Normal UniversityJinan 250014China

Batch experiments were conducted to evaluate fluoride removal by Al,Fe,and Ti-based coagulants and adsorbents,as well as the effects of coexisting ions and formation of aluminum–fluoride complexes on fluoride removal by co-precipitation with alum（Al_2（SO_4）_3·18H_2O）.Aluminum sulfate was more efficient than the other coagulants for fluoride removal in the pH range between 6 and ***-crystalline TiO_2 was more effective for fluoride removal than Al and Fe hydroxides in a pH range of 3–*** anions in water decreased the removal of fluoride in the order：phosphate（2.5 mg/L）〉 arsenate（0.1 mg/L）〉 bicarbonate（200 mg/L）〉sulfate（100 mg/L） = nitrate（100 mg/L）〉 silicate（10 mg/L） at a pH of *** effect of silicate became more significant at pH 〉 *** and magnesium improved the removal of ***-potential measurements determined that the adsorption of fluoride shifted the PZC of Al（OH）_3 precipitates from 8.9 to 8.4,indicating the chemical adsorption of fluoride at the *** presence of fluoride in solution significantly increased the soluble aluminum concentration at pH 〈 6.5.A Visual MINTEQ modeling study indicated that the increased aluminum solubility was caused by the formation of AlF^（2＋）,AlF^（＋2）,and AlF_*** AlF_x complexes decreased the removal of fluoride during co-precipitation with aluminum sulfate.

关键词： Fluoride removal Co-precipitation Aluminum sulfate Anion effect

Decolorization of Methyl Orange by a new clay-supported nanoscale zero-valent iron:Synergetic effect,efficiency optimization and mechanism

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Journal of Environmental Sciences 2017年第2期29卷 8-17页

作者： xiaoguang Li Ying Zhao Beidou Xi xiaoguang meng Bin Gong Rui Li Xing Peng Hongliang Liu School of Environment Beijing Normal UniversityBeijing 100875China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental and Municipal Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Center for Environmental Systems Stevens Institute of TechnologyHobokenNJ 07030USA

In this study, a novel nanoscale zero-valent iron（n ZVI） composite material was successfully synthesized using a low-cost natural clay, ＂Hangjin 2~#clay＂（HJ clay） as the support and tested for the decolorization of the azo dye Methyl Orange（MO） in aqueous solution by n ZVI particles. According to the characterization and MO decolorization experiments, the sample with 5：1 HJ clay-supported n ZVI（HJ/n ZVI） mass ratio（HJ-n ZVI5） showed the best dispersion and reactivity and the highest MO decolorization efficiency. With the same equivalent Fe0 dosage, the HJ-n ZVI1 and HJ-n ZVI5 samples demonstrated a synergetic effect for the decolorization of MO： their decolorization efficiencies were much higher than that achieved by physical mixing of HJ clay and n ZVIs, or the sum of HJ clay and n ZVIs alone. The synergetic effect was primarily due to the improved dispersion and more effective utilization of the n ZVI particles on/in the composite materials. Higher decolorization efficiency of MO was obtained at larger HJ-n ZVI dosage, higher temperature and under N2 atmosphere, while the MO initial concentration and p H were negatively correlated to the efficiency. HJ clay not only works as a carrier for n ZVI nanoparticles, but also contributes to the decolorization through an ＂adsorption-enhanced reduction＂ mechanism. The high efficiency of HJ-n ZVI for decontamination gives it great potential for use in a variety of remediation applications.

关键词： Nanoscale zero-valent iron Clay Material optimization Methyl Orange

Adsorption of Ca2+on single layer graphene oxide

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Journal of Environmental Sciences 2017年第7期29卷 8-14页

作者： Amalia Terracciano Jianfeng Zhang Christos Christodoulatos Fengchang Wu xiaoguang meng Center for Envronmental Systems Stevens Institute of TechnologyHobokenNJ 07030USA School of Environmental and Municipal Engineering Xi'an University of Architecture and TechnologyXi'an 710055China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China

Graphene oxide（GO） holds great promise for a broad array of applications in many fields,but also poses serious potential risks to human health and the *** this study,the adsorptive properties of GO toward Ca^（2＋） and Na＋were investigated using batch adsorption experiments,zeta potential measurements,and spectroscopic *** pH increased from 4 to 9,Ca^（2＋）adsorption by GO and the zeta potential of GO increased *** spectra suggest that Ca^（2＋）was strongly adsorbed on the GO via –COO Ca~＋ *** the other hand,Na＋was adsorbed into the electrical diffuse layer as an inert counterion to increase the diffuse layer zeta *** the GO suspension became unstable with increasing pH from 4 to 10 in the presence of Ca^（2＋）,it was more stable at higher pH in the NaC l *** findings of this research provide insights in the adsorption of Ca^（2＋）on GO and fundamental basis for prediction of its effect on the colloidal stability of GO in the environment.

关键词： Graphene oxide Calcium adsorption Raman spectra Colloidal stability

Phosphate recovery from anaerobic digester effluents using CaMg(OH)_4

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Journal of Environmental Sciences 2016年第6期28卷 260-268页

作者： Xueyu Liu Zhonghou Xu Jianfeng Peng Yonghui Song xiaoguang meng State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences College of Water Sciences Beijing Normal University Center for Environmental Engineering Stevens Institute of Technology

Dolomite lime（DL）（CaMg（OH）4） was used as an economical source of Mg^2＋for the removal and recovery of phosphate from an anaerobic digester effluent of a municipal wastewater treatment plant（MWWTP） wastewater. Batch precipitation results determined that phosphate was effectively reduced from 87 to less than 4 mg-P/L when the effluent water was mixed with 0.3 g/L of DL. The competitive precipitation mechanisms of different solids in the treatment system consisting of Ca^2＋–Mg^2＋–NH4^＋–PO4^3-CO3^2-were determined by comparing model predictions with experimental results. Thermodynamic model calculations indicated that hydroxyapatite（Ca10（PO4）6（OH）2）, Ca4H（PO4）3·3H2O, Ca3（PO4）2（beta）, and Ca3（PO4）2（am2）were more stable than struvite（MgNH4PO36·H2O） and calcite（CaCO3）. However, X-ray diffraction（XRD） analysis determined the formation of struvite and calcite minerals in the treated effluent. Kinetic experimental results showed that most of the phosphate was removed from synthetic effluent containing NH4^＋within 2 hr, while only 20% of the PO4^3-was removed in the absence of NH4^＋after 24 hr of treatment. The formation of struvite in the DL-treated effluent was due to the rapid precipitation rate of the mineral. The final pH of the DL-treated effluent significantly influenced the mass ratio of struvite to calcite in the precipitates. Because more calcite was formed when the p H increased from 8.4 to 9.6, a pH range of 8.0–8.5 should be used to produce solid with high PO4^3-content. This study demonstrated that DL could be used for effective removal of phosphate from the effluent and that resultant precipitates contained high content of phosphate and ammonium.

关键词： Phosphorus recovery Struvite Crystallization Supernatant

Release of Pb adsorbed on graphene oxide surfaces under conditions of Shewanella putrefaciens metabolism

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Journal of Environmental Sciences 2022年第8期34卷 67-75页

作者： Jianfeng Zhang ShichangWei Zhenxing Liu Huang Tang xiaoguang meng Weihuang Zhu Shaanxi Key Laboratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China Center for Environmental Systems Stevens Institute of TechnologyNJ 07030USA

In this study, Pb(Ⅱ) was used as a target heavy metal pollutant, and the metabolism of Shewanella putrefaciens(S. putrefaciens) was applied to achieve reducing conditions to study the effect of microbial reduction on lead that was preadsorbed on graphene oxide(GO) *** results showed that GO was transformed to its reduced form(r-GO) by bacteria, and this process induced the release of Pb(Ⅱ) adsorbed on the GO surfaces. After 72 hr of exposure in an S. putrefaciens system, 5.76% of the total adsorbed Pb(Ⅱ) was stably dispersed in solution in the form of a Pb(Ⅱ)-extracellular polymer substance(EPS) complex, while another portion of Pb(Ⅱ) released from GO-Pb(Ⅱ) was observed as lead phosphate hydroxide(Pb_(10)(PO_(4))_(6)(OH)_(2))precipitates or adsorbed species on the surface of the cell. Additionally, increasing pH induced the stripping of oxidative debris(OD) and elevated the content of dispersible Pb(Ⅱ)in aqueous solution under the conditions of S. putrefaciens metabolism. These research results provide valuable information regarding the migration of heavy metals adsorbed on GO under reducing conditions due to microbial metabolism.

关键词： Graphene oxide Pb(Ⅱ) Shewanella putrefaciens Extracellular polymeric substances Microbial reduction

Lead removal from water using organic acrylic amine fiber(AAF)and inorganic-organic P-AAF,fixed bed filtration and surface-induced precipitation

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Journal of Environmental Sciences 2021年第3期33卷 135-144页

作者： Jinshan Wei Lijie Duan Jian Wei Erhard Hoffmann Yonghui Song xiaoguang meng State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Center for Environmental Systems Stevens Institute of TechnologyHobokenNJ 07030USA Department of Aquatic Environmental Engineering Karlsruhe Institute of TechnologyKarsruhe 76131Germany School of Environment Tsinghua UniversityBeijing 100084China

Granular porous sorbents were normally used for heavy metals removal from *** search for the new commercial sorbent and treatment strategy,an organic acrylic amine fiber(AAF)and phosphorus loading inorganic-organic AAF(P-AAF)were prepared and used for lead(Pb)removal from water.A new strategy of inorganic-organic coupling technology was proposed for Pb removal,based on the hypothesis of surface-induced precipitation *** AAF showed a Pb adsorption capacity of 417 mg/g from the Langmuir fitting,while the column filtration technology was further applied to measure the adsorption edge and *** of different initial Pb concentrations,hydraulic retention time,and co-existing P were considered in the filtration *** presence of 0.8 mg/L P in water significantly improved the Pb breakthrough point from 15,000 to 41,000 bed volumes of water spiked with 85μg/L Pb,while the P-AAF fixed bed showed better removal of Pb than AAF SEM/EDX and XRD spectra were employed for determining the surface functional groups and the formation of surface-induced precipitation of pyromorphite(Pb_5(PO_4)_3 OH)on *** study verified the application of AAF sorbent for Pb removal and the enhanced effect of coating P on AAF,thus improved our fundamental understanding and application of the surface chemistry process of Pb with P.

关键词： Lead removal Adsorption Fixed bed filtration Acrylic amine fiber Inorganic-organic sorbent Surface-induced precipitation