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The IWA Conference on Pretreatment of Water and Wastewater(国际水协水和废水预处理会议)

作者： Liping Liang Xiaohong Guan State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghaiPR China State Key Lab of Urban Water Resource and Environment Harbin Institute of TechnologyHarbinPR China State Key Lab of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbinPR China

The effect ofweak magnetic field(WMF)on Se(Ⅳ)removalby zero valent iron(ZVI)was investigated as functions of pH and initial Se(Ⅳ)*** of neodymium-iron-boron permanent magnets on an iron sheetto offer magnetic fielda...

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Enhanced nitrogen removal reliability and efficiency in integrated constructed wetland microcosms using zeolite

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Frontiers of Environmental Science & Engineering 2012年第1期6卷 140-147页

作者： Yue WEN Chao XU Gang LIU Yi CHEN Qi ZHOU State Key Lab of Pollution Control and Resources Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

The purpose of this study is to reduce the seasonal fluctuation and enhance the efficiency of nitrogen removal in vertical flow-horizontal subsurface flow （VF- HSF） constructed wetlands. Two sets of VF-HSF con- structed wetlands were built, VF 1-HSF 1 and VF2-HSF2, and a zeolite section was placed in VF2. The results showed that VF2-HSF2 compared to VF 1-HSF 1 was not only a more reliable nitrogen removal method, but also enhanced the nitrogen removal efficiency by 50%. The average apparent rate of nitrogen removal in VF2-HSF2 reached to 2.52gN.m^-3·d^-1, which doubled the rate in VF1-HSF1. Plant uptake and organic nitrogen sediment accounted for 12% and 6% of the total nitrogen removal in VF1-HSF1, respectively, and 10% and 4% in VF2-HSF2, respectively. Biologic nitrogen removal was the dominant mechanism, which accounted for 79% and 87% of the total nitrogen removal in VF1-HSF1 and VF2-HSF2, respectively. Ammonia adsorbed by zeolite during the cold seasons was desorbed, and then nitrified in warm seasons, which resulted in a bioregeneration efficiency of 91%. Zeolite in VF was capable of transferring ammonia from cold seasons to warm seasons as well as enhancing nitrification, which was accompanied by high potential denitrification in HSF that reinforced the efficiency and relieved seasonal fluctuation of nitrogen removal in VF- HSF.

关键词： constructed wetland zeolite bioregeneration nitrogen removal

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Se nanoparticle resonance scattering method for the determination of trace vitamin C

Se nanoparticle resonance scattering method for the determin...

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2013 3rd International Conference on Advanced Measurement and Test, AMT 2013

作者： Liu, Qing Ye Zhang, Biao Ming Liang, Ai Hui State Key Lab. Cultivation Base for the Chemistry and Molecular Eng. of Medicinal Resources Ministry of Science and Technology of China Guangxi Normal University Guilin 541004 China Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Ministry of Education Guangxi Normal University Guilin 541004 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guangxi Normal University Guilin 541004 China

ISBN: (纸本)9783037857168

In the medium of hydrochloric acid, Vitamin C (VC) reacts with Se(VI) to form Se particles. The particles exhibit four resonance scattering peaks at 340, 400, 470 and 520 nm. VC concentration is proportional to the I340nm in the range of 0.05 to 4.0μg ml-1. Based on this fact, a new resonance scattering spectral (RSS) method has been proposed for the determination of VC with a detection limit of 0.01μg ml-1. This method was used to determination of VC in pharmaceuticals, synthetic samples with satisfactory results. © (2013) Trans Tech Publications, Switzerland.

关键词： Nanoparticles

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Removal of Reactive Blue (RB2) from aqueous solution by chitosan/diatomite biocomposite

Removal of Reactive Blue (RB2) from aqueous solution by chit...

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International Conference on Biotechnology, Chemical and Materials Engineering (CBCME 2011)

作者： Chen, Yi Tang, Zhiru Wen, Yue Xu, Chao Li, Ling Zhou, Qi State Key Lab of Pollution Control and Resources Reuse Tongji University Shanghai China

ISBN: (纸本)9783037853078

The adsorption behavior of Reactive Blue (RB2) dye from aqueous solution on chitosan/diatomite biocomposite adsorbent was studied. The effects of biocomposite adsorbent ratio and pH on removal of RB2 were examined, and optimum experimental conditions were identified. Biocomposite adsorbent had the largest adsorption efficiency when the ratio was 10 wt%. The maximum percentage removal of RB2 was 96.36% which obtained at pH 4.0. Adsorption equilibrium showed adsorption amount of RB2 improved with increase in the amount of NaCl, indicating that the addition of inorganic salt was an advantage of the removal of RB2.

关键词： chitosan/diatomite biocomposite decolorization rate adsorption capacity adsorption equilibrium

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Influence of hydraulic retention time on efficiencies of high concentration PAC-MF bioreactor treating slightly polluted surface water

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Journal of Harbin Institute of Technology(New Series) 2012年第1期19卷 71-74页

作者：马聪于水利时文歆王硕衣雪松金丽梅 Dept. of Municipal and Environmental Engineering Harbin Institute of Technology State Key Lab of Pollution Control and Resources Reuse Tongji University

In this study,the influence of hydraulic retention time on feasibility,efficiency and membrane foul- ing of slightly polluted surface water treatment by a high concentration PAC-MF bioreactor were investigated. During three months operation,TOC,NH4 + -N,nitrobenzene,and TMP were measured to evaluate the MBR performance. The results show that,when HRT reduces from 3 h to 1 h,removal efficiency of TOC and ammonia-nitrite decrease a little. However,there is little effect of HRT on nitrobenzene. And the optimal hydraulic retention time is 1 h.

关键词： powdered activated carbon microfiltration performance hydrauic retention time

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Arsenate and arsenite removal by FeCl3: Effects of pH, As/Fe ratio, initial As concentration and co-existing solutes

Arsenate and arsenite removal by FeCl3: Effects of pH, As/Fe...

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作者： Qiao, Junlian Jiang, Zheng Sun, Bo Sun, Yuankui Wang, Qi Guan, Xiaohong State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China State Key Lab of Urban Water Resource and Environment Harbin Institute of Technology Harbin China

Coagulation is one of the most commonly used technologies for arsenic removal from water and wastewater. Jar tests were carried out to determine the influence of pH, initial As/Fe molar ratio, equilibrium As concentration and co-occurring solutes on the crossover pH, where As(V) removal was equivalent to As(III) by FeCl3coagulation. As(V) was more effectively removed than As(III) at lower pH values in FeCl3coagulation process but the opposite was true at higher pH level. Increasing As/Fe ratio from 0.12 to 0.50 progressively lowered the crossover pH from 8.5 to 7.4. The arsenic isotherms revealed that As(V) removal was favored at low pH and low equilibrium concentration yet the opposite was true for As(III). The co-existing solutes had different influences on the crossover pH, depending on their ability to compete for sorption sites and to hinder or facilitate the aggregation of ferric hydroxide flocs. The presence of sulfate broadened the pH range where As(III) removal was better than As(V) removal. However, As(V) removal was always superior to As(III) removal in the presence of Ca2+and no crossover pH was observed. The results from this study revealed that arsenic speciation, arsenic loading, and pH should be considered when predicting and managing arsenic removal by coagulation. © 2012 Elsevier B.V. All rights reserved.

关键词： Iron compounds

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RETRACTED ARTICLE: The contribution of leaching under different pH to nutrients release of cattail litter

RETRACTED ARTICLE: The contribution of leaching under differ...

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作者： Zhou, Junwei Wen, Yue Zhou, Qi State Key Lab. of Pollution Control and Resources Reuse Tongji University Shanghai China

ISBN: (纸本)9781424450893

The anaerobic decomposition of aquatic plants could serve the dual roles for producing renewable energy and reducing waste. In this study, a lab.ratory experiment was carried out using cattail (a lignocellulosic aquatic plant) as substrate to explore the contribution of leaching to its nutrients release under 25°C and different pH conditions. Results showed that the nutrients release was significantly influenced by pH values. Alkaline conditions favored the dissolution of SCOD, HS and protein while reducing sugar was much easier to release under acidic solution. On 25thday, about 9%, 11% and 37% of COD was converted from the solid phase to the liquid phase at pH 6, 9 and 12, respectively. It was the complex structure of lignocellulose that made it need strong alkaline condition and more time to decompose. VFAs production increased with pH value, and achieved maximum 88mg / L under the condition of pH 12 and the retention time 25d. The concentration of VFAs accounted a tiny part in total organic carbon of leaching liquor probably because of the lack of enzymatic reaction of microorganism. © 2011 IEEE.

关键词： Alkalinity

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RETRACTED ARTICLE: Biochemical conversion of lignocellulose to volatile acids at various pH

RETRACTED ARTICLE: Biochemical conversion of lignocellulose ...

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作者： Zhou, Junwei Wen, Yue Zhou, Qi State Key Lab of Pollution Control and Resources Reuse Tongji University Shanghai China

ISBN: (纸本)9781424450893

Batch fermentation experiments were performed to investigate the anaerobic degradation of cattail litter and its conversion to VFAs at 25°C and pH from 6 to 12. Results showed that lignin and hemicellulose had a better removal rate under alkaline conditions, while alkalescence conditions favored the degradation of cellulose. The FTIR analysis of different samples further confirmed the conclusion above. VFAs yield and the distribution of individual VFA were both sensitive to pH variation. The concentration of TOC and VFAs had a high correlation, indicating that VFAs accumulation partially depended on the TOC release. Moreover, the comparison between poisoned and non-poisoned incubations revealed a sustained biological effect on the conversion of TOC into VFAs in fermentation system. Results of this investigation could serve the dual roles for producing readily biodegradable COD and reducing lignocellulosic waste. © 2011 IEEE.

关键词： Volatile fatty acids

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RETRACTED ARTICLE: The effects of C/N and acetic/propionic acid ratio on the denitrification in constructed wetlands

RETRACTED ARTICLE: The effects of C/N and acetic/propionic a...

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作者： Cao, Asheng Xue, Chonghua Wen, Yue Zhou, Qi State Key Lab of Pollution Control and Resources Reuse Tongji University Shanghai China

ISBN: (纸本)9781424450893

The effects of acetic to propionic acid ratio and C/N ratio on the denitrification were investigated. Six constructed wetlands were built with acetic to propionic acid ratio (carbon molar ratio) were 8/1, 4/1, 2/1, 1.5/1, 1/1 and single acetic acid as carbon sources in the influent respectively. The experiments were carried out under C/N ratio 7.5 and 3.0. Result showed that with appropriate amount of the propionic acid adding into acetic acid, the denitrification ability enhanced. And under different C/N ratio conditions the acetic to propionic acid ratio was different for getting the the highest denitrification rate: when C/N=7.5, the highest denitrification rate would appear when the acetic to propionic acid ratio was 4/1, and the denitrification rate was 0.77 mg·L-1·min-1which was 1.17 times as high as the single acetic acid employed for the carbon source; and when C/N=3, the ratio was 1/1, and the denitrification rate was 0.62 mg·L-1·min-1which was 1.29 times as high as the one with single acetic acid added. Moreover, under both C/N ratio conditions, the consumption of the acetic acid and propionic acid was contemporary. © 2011 IEEE.

关键词： Propionic acid

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Adsorption isotherm and thermodynamic of triclosan on activated sludge

Adsorption isotherm and thermodynamic of triclosan on activa...

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2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011

作者： Shi, Lu Zho, Xuefei Zhou, Shibing Zhang, Yalei State Key Lab. of Pollution Control and Resource Reuse Tongji University Shanghai China Key Lab of Yangtze Water Environment Ministry of Education Tongji University Shanghai China

ISBN: (纸本)9781457702907

Batch experiments were conducted to investigate the adsorption behavior of triclosan (TCS) at g/L level in activated sludge. Effects of time, temperature, and MLSS on adsorption behavior were studied, and adsorption isotherm and thermodynamic parameters were studied as well. Sorption of TCS on the sludge was found to be physics-sorption, and partitioning played a significant role. TCS sorption process on sludge is basically exothermic and spontaneous. The study was meaningful for understanding the removal behavior of TCS in biological sewage treatment system. © 2011 IEEE.

关键词： Adsorption

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