WANGFei,LINSheng-lan,ZHUXiao-zhi,et al.Formation of Disinfection Byproducts from Pipe Wall Biofilm and Their Toxicity Evaluation[J].China Water & Wastewater,2024,40(11):31-40.
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Formation of Disinfection Byproducts from Pipe Wall Biofilm and Their Toxicity Evaluation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第11期 Page: 31-40 Column: Date of publication: 2024-06-01
Author(s):
WANG　Fei1;  LIN　Sheng-lan1;  ZHU　Xiao-zhi1;  ZHANG　Xin-yue2; 3;  LIN　Tao2; 3
（1. Nanjing Water Group Co. Ltd.， Nanjing 210036， China； 2. College of Environment， Hohai University， Nanjing 210098， China； 3. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake ， Hohai University， Nanjing 210098， China）
Keywords:
pipe material;  pipe wall biofilm;  disinfection byproducts;  chlorine dosage;  toxicity risk
Abstract:
This paper investigated the potential of biofilm attached on three common water supply pipe walls (ductile iron, steel, and polyethylene) to generate typical carbonaceous disinfection byproducts (C-DBPs) and nitrogenous disinfection byproducts (N-DBPs) under the effect of chlorination, explored the effect of disinfectant dosage on disinfection byproducts (DBPs), and further evaluated the potential toxicological hazards of the pipe wall biofilm as DBPs precursors. The DBPs formation potential (DBPFP) of the pipe wall biofilm was more advantageous than that of the bulk water. The effect of chlorine dosage on C-DBPs and N-DBPs formation from different pipe wall biofilm was distinct. The yield of trihalomethane (THMs) and haloacetic acid (HAAs) increased with the increase of chlorine dosage. The N-DBPs production from ductile iron wall biofilm increased first and then decreased. The production of dichloroacetonitrile (DCAN) and dichloroacetamide (DCAcAm) generated from the steel and PE iron wall biofilm increased first and then decreased, while the production of trichloronitromethane (TCNM) kept increasing. The toxicity evaluation showed that the toxicity formation potential of pipe wall biofilm was higher at high chlorine dosage. However, the toxicity formation potential displayed a slower growth trend or a decrease tendency with the continuous increase of chlorine dosage. Compared with C-DBPs, N-DBPs had a higher contribution rate to the toxicity formation potential of pipe wall biofilm. The key to reduce the pipe wall biofilm cytotoxicity risk was to control DCAN and HAAs, and the core to avoid the genotoxicity risk was to prevent the formation of TCNM.
Last Update: 2024-06-01