TY - JOUR ID - 10.1016/S1001-0742(13)60422-2 TI - Biostability in distribution systems in one city in southern China:Characteristics, modeling and control strategy AU - Pinpin Lu AU - Xiaojian Zhang AU - Chiqian Zhang AU - Zhangbin Niu AU - Shuguang Xie and Chao Chen VL - IS - 2 PB - SP - 323 EP - 331 PY - JF - Journal of Environmental Sciences JA - J. Environ. Sci. UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2014260212&flag=1 KW - bacterial regrowth;distribution system;biostability;AOC;chloramine residual KW - bacterial regrowth;distribution system;biostability;AOC;chloramine residual AB - This study investigated the bacterial regrowth in drinking water distribution systems receiving finished water from an advanced drinking water treatment plant in one city in southern China. Thirteen nodes in two water supply zones with different aged pipelines were selected to monitor water temperature, dissolved oxygen (DO), chloramine residual, assimilable organic carbon (AOC), and heterotrophic plate counts (HPC). Regression and principal component analyses indicated that HPC had a strong correlation with chloramine residual. Based on Chick-Watson's Law and the Monod equation, biostability curves under different conditions were developed to achieve the goal of HPC ≤qslant 100 CFU/mL. The biostability curves could interpret the scenario under various AOC concentrations and predict the required chloramine residual concentration under the condition of high AOC level. The simulation was also carried out to predict the scenario with a stricter HPC goal (≤qslant 50 CFU/mL) and determine the required chloramine residual. The biological regrowth control strategy was assessed using biostability curve analysis. The results indicated that maintaining high chloramine residual concentration was the most practical way to achieve the goal of HPC ≤qslant 100 CFU/mL. Biostability curves could be a very useful tool for biostability control in distribution systems. This work could provide some new insights towards biostability control in real distribution systems. ER -