SHENHu,WANGYong-lei,JULing,et al.Performance and Economic Analysis of Air Flotation Process in Urban Water Supply Plant[J].China Water & Wastewater,2023,39(3):47-55.
Performance and Economic Analysis of Air Flotation Process in Urban Water Supply Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第3期
Page:
47-55
Column:
Date of publication:
2023-02-01
- Keywords:
- water supply plant; air flotation; operational performance; economic analysis; equipment performance evaluation
- Abstract:
- With the frequent occurrence of seasonal algal blooms, an increasing number of water supply plants are applying air flotation process to water treatment. The bubble characteristics and pollutants removal performance of the air flotation equipments of four typical water supply plants in China were evaluated by using high-speed cameras and other equipments. In addition, the performance of the air flotation equipment was evaluated, and the change in operational energy consumption was investigated.The overall operation of the air flotation equipment was basically normal. The air-dissolved efficiency of the air flotation equipment in each water supply plant was 58.4%-78.7%, the average particle size of the bubble was always less than 30 μm, and the bubble stabilization time was mostly more than 240 s. The removal rates of turbidity and algae were 50.70%-77.66% and 77.41%-86.31%, respectively. The removal rates of TOC, UV254 and CODMn were not high. However, it alleviated the operational load of the subsequent process. In addition, the higher electric energy and chemicals consumption caused by the operation of air flotation process could be offset by the reduction of other indicators, and the operational cost only increased by 0.024-0.030 yuan/m3. The performance, operational cost and effluent quality of the air flotation process indicate that the process has good applicability to the treatment of low turbidity and high algae density water in urban water supply plants.
Last Update:
2023-02-01