Wuxi Water Works Co.

Wuxi, China

Wuxi Water Works Co.

Wuxi, China
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Gao M.-H.,Tongji University | Gao N.-Y.,Tongji University | Xie H.-H.,Tongji Architectural Design Group Co. | An N.,Tongji University | And 2 more authors.
Journal of Central South University | Year: 2015

A simple and rapid technique based on liquid-liquid extraction coupled to gas chromatography-mass spectrometric detection (LLE-GC-MS) was developed for analysis of taste and odour compound β-ionone in water. Instrument parameters including programmed oven temperature, injection temperature and ion source temperature were evaluated and optimized. Effects of extraction time, ionic strength and pH on the detection efficiency were investigated and optimum conditions were 8 min of extraction time, without NaCl addition at pH=9. Good linearity (R2=0.9997) was obtained when the linear range was 10–500 μg/L. The recoveries of β-ionone in ultrapure water and tap water samples were 88%–95% and 110%–114%, respectively. The relative standard deviations (RSD) were less than 10%. The method detection limit (MDL) and rejection quality level (RQL) were achieved at 1.98 μg/L and 6.53 μg/L, respectively. LLE-GC-MS was demonstrated to be a rapid and convenient method for the determination of β-ionone in water samples. © 2015, Central South University Press and Springer-Verlag Berlin Heidelberg.

Yin D.,Tongji University | Gao N.,Tongji University | Gao M.,Tongji University | Rong W.,Wuxi Water Works Co. | And 2 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2015

Response surface methodology(RSM) was applied for optimizing the enhanced coagulation process by preozonation for Taihu lake water. Based on single-factor experiments, three independent variables(ozone dosage, coagulant dosage and residence time) were selected as affecting factors and three dependent variables(chemical oxygen demand(CODMn) removal efficiency, turbidity removal efficiency and operating cost) as responses. An experimental design of three factors and three levels was arranged through Box-Benhnken design (BBD). According to the proposed quadratic models, maximal CODMn and turbidity removal efficiencies and minimal operating costs are obtained at following optimum condition: The ozone dosage, coagulant dosage and residence time are found to be 0.9 mg/L, 35 mg/L and 17 min for aluminum sulfate(AS) and 0.9 mg/L, 24 mg/L, and 17 min for polymerization aluminum chloride(PAC), respectively. ©, 2015, Editorial Department of Journal of Sichuan University. All right reserved.

Gao M.,Tongji University | Gao N.,Tongji University | Zhou J.,Tongji University | Rong W.,Wuxi Water Works Co. | And 2 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2014

The effluent quality of combined process containing O3-BAC treatment between sedimentation process and dissolved air flocculation(DAF) process for the treatment of East Taihu Lake raw water were compared. The results showed that the removal efficiency of turbidity by DAF was 10.1% higher than that by sedimentation process, and the effluent turbidity was stabled at 1 NTU or less after the treatment of the O3-BAC. Compared with the sedimentation process, the CODMnand DOC removal efficiencies of DAF were increased by 5.4% and 1.6%, respectively. The CODMnand DOC were stabled at 0.5-2.1 mg/L and 0.3-2.0 mg/L after O3-BAC process respectively, while the organic concentration could not reach to effluent standard after conventional treatment. O3-BAC process played a dominant role in the decrease of fluorescence intensity, while conventional treatment process had only a slight or no effect on the removal of fluorescent material. The experimental results indicated that the DAF was slightly better for algae removal efficiency than sedimentation process. The concentration of diatom activity and chlorophyll decreased to 0 and cyanobacteria still retained part of the activity after advanced treatment.

Gao N.-Y.,Tongji University | Zhu M.-Q.,Tongji University | Zhou S.-Q.,Tongji University | Li L.,Tongji University | And 3 more authors.
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2014

Six kinds of nitrogen-enriched intracellular and extracellular algae organic matters of Microcystic aeruginosa with different characteristics were obtained via the fractionation electrodialysis of hydrophilic and hydrophobic components, with the mass concentrations of dissolved organic nitrogen (DON) ranging from 0.57 to 1.69 mg/L. Then, the 3D fluorescence spectrography was adopted to analyze the composition of hydrophilic and hydrophobic components, finding that the former was mainly composed of humus-like substances and the latter mainly composed of protein. Afterwards, the formation characteristics of carbonaceous (nitrogenous) disinfection byproducts from different organic matters were analyzed and compared after a 3-day chlorination. The results show that (1) hydrophobic intracellular and extracellular organic matters are of maximum trihalide methane formation potential, especially for chloroform; (2) there is a significant correlation between haloketone formation potential and intracellular and extracellular organic matters; (3) the hydrophilic component in intracellular organic matters is of the greatest nitrogenous disinfection by-products formation potential (DBPFP); (4) the disinfection by-products formation potential of each component is not only determined by the value of DOC/DON (namely the mass concentration ratio of dissolved organic carbon to DON) but also by the characteristics of DON; (5) the DBPFP of extracellular organic matters is positively correlated with the content of aromatic organic materials, while that of intracellular organic matters is mainly influenced by the properties of aromatic organic materials; and (6) the disinfection by-products produced by extracellular organic matters are in a content order of hydrophobic by-products>hydrophilic by-products>transphilic by-products, while those produced by intracellular matters are indicative of the following order: hydrophilic by-products>hydrophobic by-products>transphilic by-products.

Yin D.,Tongji University | Lu N.,Wuxi Water Works Co. | Yuan J.,Wuxi Water Works Co. | Gao N.,Tongji University | And 2 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2015

Comparison of the treatment effect and mechanisms of different preoxidants on algal cells were analyzed by the experiments of inactivation of M. aeruginosa with potassium permanganate, ozone and sodium hypochlorite. The results showed that the decrease of quantum yield of M. aeruginosa caused by chlorination and ozonation both followed second-order kinetics. Sodium hypochlorite caused the cell lysis with the quantum yield rate constant of (220±3)L·mol-1·s-1 and resulted in the release of intracellular organic matter (IOM) regardless of initial concentration. Ozone had a profound oxidation effect on M. aeruginosa cells and would rapidly cause the cell lysis with the rate constant of (2655±15)L·mol-1·s-1 regardless of the initial ozone dosages. The sequence of the quantum yield rate constants of three oxidations was O3>NaClO>KMnO4. However, both ozone and sodium hypochlorite caused the cell lysis and led to the release of IOM more easily than potassium permanganate, which was suggested by the results of scanning electron microscopy. ©, 2015, Harbin Institute of Technology. All right reserved.

Lu J.,Huaiyin Institute of Technology | Lu J.,Wuxi Waterworks Co. | Wu J.,Huaiyin Institute of Technology | Chen J.,Huaiyin Institute of Technology | And 4 more authors.
Journal of Applied Polymer Science | Year: 2015

The poly(2-(diethylamino)ethyl methacrylate)/palygorskite (PDEAEMA/PAL) composite microspheres were prepared via Pickering emulsion polymerization using palygorskite (PAL) as an emulsifier. The morphology, chemical structure, and content of PDEAEMA/PAL composite microspheres were investigated by polarizing optical microscopy, scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy, and thermal gravimetric analysis (TGA). The pH-responsive behavior of composite microspheres was studied by measuring their size at different pH values. Furthermore, their release behavior was investigated using rhodamine B (RhB) as a model molecule. It was proven that the release properties of RhB from PDEAEMA/PAL composite microspheres could be controlled by adjusting the pH values. The study of release kinetics found that Higuchi model was fit for RhB release from PDEAEMA/PAL composite microspheres at pH 5.0, 7.4, and 10.0. © 2015 Wiley Periodicals, Inc.

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