Ke-li Wang

Publications (2)0 Total impact

• Conference Proceeding: Trihalomethane Occurrence in Chlorinated Hospital Wastewater

  Ying-Xue Sun, Ping Gu, Ke-Li Wang
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  ABSTRACT: Chlorination as a disinfection process is often used for disinfecting hospital wastewater in order to prevent the spread of pathogenic microorganisms and causal agents of nosocomial infectious diseases, but harmful byproducts might be formed and cause adverse ecological and health effects. In this study, the generation of trihalomethane (THMs) in the effluent of hospital wastewater during chlorine disinfection process was evaluated. The results showed the formation of THMs increased gently along the increasing chlorine dosages at beginning of the chlorine disinfection, but increased significantly after the chlorine dosages over 20 mg/L. Chloroform was the most abundant THM species and occupied above 40% of the total concentration. The second-order model interpretation of the long-term formation of THMs showed a good linearity and a second-order rate constant of 0.8857 (mg/L)^-1s^-1 in this experiments. Additionally, THM formations in these water samples well correlated with SUVA with generally exponential (R =0.9987).
  Bioinformatics and Biomedical Engineering, 2008. ICBBE 2008. The 2nd International Conference on; 06/2008
• Article: [Adsorbable organic halogen compounds and bio-toxicity in hospital wastewater treatment].

  Ying-xue Sun, Feng Zhang, Ke-li Wang, Ping Gu
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  ABSTRACT: Adsorbable organic halogen compounds (AOX) exist persistently in the aquatic environment, and accumulate in the food chain. Some of them are toxic for humans and other organisms. However, hospital wastewater is considered as an important source of AOX in municipal wastewater. The aim of this study was to evaluate the generation of AOX both in a raw hospital wastewater and the effluent from a membrane sequencing batch reactor, also the effect of cR t value and the bio-toxicity were investigated. The results show that the removal of AOX in the hospital wastewater is 63.6% after treated by the membrane sequencing batch reactor, and the contribution of membrane rejection accounts for 14.5%. The concentration of AOX in the raw hospital wastewater is much higher than that of the effluent from membrane sequencing batch reactor at the same value of cR t for its higher chlorine-demands. Along with the increasing of cR t value, the fitting curves of AOX present exponential growth for the raw hospital wastewater, while linearity relation for the effluent from membrane sequencing batch reactor. To meet the requirement for indicative microorganism (fecal coliform) in the Discharge Standard of Water Pollutants for Medical Organization (GB 18466-2005), the demands of cR t value for the raw hospital wastewater and the effluent from membrane sequencing batch reactor are 5.5 (mg x h)/L and 0.0075 (mg x h)/L respectively, the bio-toxity by acute toxicity test with Daphnia magna are 40.39 microg/L (K2Cr2O7) and 8.96 microg/L (K2Cr2O7), and correspondingly the concentration of AOX produced are 607.1 microg/L and 102.5 microg/L.
  Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 11/2007; 28(10):2219-22.