ZHANG Xin-yue,ZHOU Ke-mei,LIU Yu,et al.Effect of Water Supply Pipe Material on Biofilm Characteristics and Water Quality Stability[J].China Water & Wastewater,2022,38(9):44-51.
Effect of Water Supply Pipe Material on Biofilm Characteristics and Water Quality Stability
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第9期
Page:
44-51
Column:
Date of publication:
2022-05-01
- Keywords:
- water supply pipe material; biofilm characteristics; residual chlorine decay; organic matter characteristics; community composition
- Abstract:
- Biofilm attached on pipe wall was cultivated in a modified biofilm annular reactor to investigate the effects of different pipe materials (polyethylene, steel and ductile iron) on biomass and microbial community composition of the biofilm. Residual chlorine decay test was carried out to explore the influence of pipe material on the change of residual chlorine in bulk water and the characteristics of organic matter at different initial chlorine concentrations. The descending order of biomass in the inner wall of three kinds of pipes was ductile iron, steel and polyethylene. Pipe material had a significant effect on microbial community composition. The relative abundance of Actinobacteria accounted for 64.44% in polyethylene pipe wall, and Alphaproteobacteria and Gammaproteobacteria were the dominant classes in steel pipe and ductile iron pipe walls. Pipe material and initial chlorine concentration played an important role in the stability of pipe water quality. When the initial chlorine concentration was 0.5 mg/L, the residual chlorine in each pipe decayed rapidly and was completely consumed within 10 h. When the initial chlorine concentration was 1.0 mg/L, the concentration of hydrophilic organic carbon (CDOC) in the bulk water of polyethylene pipe increased significantly. When the initial chlorine concentration was 2.0 mg/L, the decay rate of residual chlorine in ductile iron pipe was 2-3 times that of the other two kinds of pipe, and the concentration of CDOC in bulk water was much higher than that of polyethylene pipe and steel pipe.
Last Update:
2022-05-01