JIANGQi-jun,XUWei-fa,LIUYue-feng,et al.Application of Bacillus Prevention and Control Measures in Drinking Water Plant with Conventional Treatment Process[J].China Water & Wastewater,2023,39(9):116-121.
Application of Bacillus Prevention and Control Measures in Drinking Water Plant with Conventional Treatment Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第9期
Page:
116-121
Column:
Date of publication:
2023-05-01
- Keywords:
- Bacillus; spore; conventional treatment process; drinking water plant; risk prevention and control; quantitative measure
- Abstract:
- In drinking water plants with conventional treatment process, chlorine-resistant bacteria represented by Bacillus are often detected in the whole process of raw water, purification, transmission and distribution. There are management risks such as the total number of bacterial colonies in the product water exceeding the standard, and there are also health risks to users. Therefore, drinking water plants with conventional treatment process need to achieve risk prevention and control through specific enhanced measures. Based on the temporal and spatial distribution of Bacillus and its spores in drinking water plants with conventional treatment process, this project ensured turbidity removing performance in the whole process by three specific strategies, namely quantifying risk early warning, avoiding bacterial enrichment in filter and limiting the growth of Bacillus in filter, so as to achieve effective risk prevention and control in engineering projects. According to the specific conditions of the project, the prevention and control measures included adjusting the backwashing cycle of the filter, increasing the intensity of water flushing with dual pumps and adjusting the duration of “air wash-air and water wash-water wash”. The dosage of chlorine was above 1.0 mg/L before the filter, and the residual chlorine in the effluent was greater than 0.3 mg/L. The dosage of basic aluminium chloride was optimized, the sludge discharge was strengthened, and the recycling was reduced. When necessary, basic aluminium chloride was added in front of the filter to reduce turbidity after sedimentation, filtration and purification to ensure that the turbidity removal performance was not lower than the normal operation state. The operational data showed that the series of strategies effectively guaranteed the non-detection of Bacillus in the product water from drinking water plants with conventional treatment process, and the water quality met the limit specified in the Standards for Drinking Water Quality (GB 5749-2022).
Last Update:
2023-05-01