Research of Water Quality Safety of Water Source Reservoir in Water Supply Project——a case Study of Mopanshan Reservoir

Abstract

Abstract Water reservoirs play a vital role in ensuring the drinking water health of urban residents. In order to study the water quality safety of water source reservoirs in water supply projects, the physical and chemical indexes of water quality in Mopansan reservoir was analyzed. The microbial diversity, community structure characteristics were analyzed by high-throughput sequencing technology. The results showed that the main exceeding standard indexof water quality of Mopan- shan Reservoir in 2022 was total nitrogen(TN). The microbial communities in the water body and sediments in the reservoir center and before the dam were com- posed of 380 genera. The microbial diversity in sediment was higher than that in water. The influence order of water quality factors on microbial community was DO > CODcr > TN > Mn2 + > Fe2+. Potential pathogenic microorganisms were detected in water and sediment samples. Although no coliform bacteria were detected, disinfection as a water supply source was still necessary. Redundancy analysis (RDA) showed that the main water quality factors affecting microbial community structure were DO and TP in the dry season, but the pattern was not obvious in the wet season. Sodium hypochlorite has a good disinfection effect on tap water and can fully ensure water quality safety.