Biostability in distribution systems in one city in southern China: Characteristics, modeling and control strategy  

作　　者：Pinpin Lu Xiaojian Zhang Chiqian Zhang Zhangbin Niu Shuguang Xie Chao Chen 

机构地区：[1]School of Environment, Tsinghua University [2]Department of Civil and Environmental Engineering, University of Missouri [3]Urban and Rural Planning Center, Ministry of Housing and Urban-Rural Development of the People’s Republic of China [4]College of Environmental Sciences and Engineering, the Key Laboratory of Water and Sediment Sciences (Ministry of Education), Peking University

出　　处：《Journal of Environmental Sciences》2014年第2期323-331,共9页环境科学学报（英文版）

基　　金：supported by the National Water Special Program of China (No. 2009ZX07423-004);the High Technology Research and Development Program (863) of China (No. 2009AA06Z308);the International Science & Technology Cooperation Program of China (No. 2010DFA91830)

摘　　要：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 southem 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 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 carded out to predict the scenario with a stricter HPC goal （≤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 ≤ 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.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 southem 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 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 carded out to predict the scenario with a stricter HPC goal （≤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 ≤ 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.

关 键 词：bacterial regrowth distribution system biostability AOC chloramine residual 

分 类 号：TU991[建筑科学—市政工程]