XUHang,LIUBo-nan,WANGYue-ting,et al.Changes of Water Quality and Biofilm Community Composition in Raw Water Pipeline of Emergency Water Source[J].China Water & Wastewater,2023,39(5):38-45.
Changes of Water Quality and Biofilm Community Composition in Raw Water Pipeline of Emergency Water Source
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第5期
Page:
38-45
Column:
Date of publication:
2023-03-01
- Abstract:
- The raw water pipeline of emergency water source is relatively closed. Long hydraulic retention time of raw water in the pipeline will lead to the decrease of dissolved oxygen (DO), and change the environment of the pipeline from aerobic to anoxic or even anaerobic, resulting in the deterioration of water quality. The state of the raw water from two different water sources was simulated in two laboratory reactors M and N. The retention time was determined by reducing the DO to 2 mg/L, and the corresponding water quality change, chemical stability of the raw water and diversity of the microbial community on pipe wall were investigated. The decay time of DO in source water with poor water quality was obviously shorter than that in source water with good water quality. The water from both sources was highly corrosive, and the effluent pH, total alkalinity and calcium hardness were all significantly increased. Reactor M had poor influent quality, high microbial concentration and higher removal rate of organic matter. The removal rates of CODMn and UV254 in reactor M were 27.8% and 22.9%, respectively, while those were 24.6% and 21.4% in reactor N. Reactor M had stronger nitrification ability, in which the generation rate of NO3--N was 23.4%, while that was 16.2% in reactor N. The dominant bacterial phyla in biofilm on the pipe wall of the two rectors were basically the same. However, the phyla with higher relative abundance were quite different, while the difference of phyla with lower relative abundance was not obvious. Higher NH4+-N was conducive to increasing the abundance of Nitrospira, thus promoting the nitrification reaction. Good water quality increased the microbial diversity in the pipeline, which was more conducive to the stability of the ecosystem in the pipeline.
Last Update:
2023-03-01