title: Biological stability in drinking water: a regression analysis of influencing factors.
abstract: Some parameters, such as assimilable organic carbon (AOC), chloramine residual, water temperature, and water residence time, were measured in drinking water from distribution systems in a northern city of China. The measurement results illustrate that when chloramine residual is more than 0.3 mg/L or AOC content is below 50 microg/L, the biological stability of drinking water can be controlled. Both chloramine residual and AOC have a good relationship with Heterotrophic Plate Counts (HPC)(log value), the correlation coefficient was--0.64 and 0.33, respectively. By regression analysis of the survey data, a statistical equation is presented and it is concluded that disinfectant residual exerts the strongest influence on bacterial growth and AOC is a suitable index to assess the biological stability in the drinking water.
authors.affiliation: Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. luw02@mails.tsinghua.edu.cn
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.forename: Xiao-Jian
authors.initials: XJ
authors.lastname: Zhang
mesh_terms: D001419:Bacteria / Q000254:growth & development*; D002244:Carbon / Q000032:analysis; D002681:China; D002700:Chloramines / Q000032:analysis; D002947:Cities; D008954:Models, Biological; D012044:Regression Analysis; D013997:Time Factors; D014871:Water Microbiology / Q000592:standards*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000592:standards*
chemical_list: D002700:Chloramines; D002244:Carbon; C030816:chloramine