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.
城镇给水厂气浮工艺运行性能与经济性分析
- Title:
- Performance and Economic Analysis of Air Flotation Process in Urban Water Supply Plant
- Keywords:
- water supply plant; air flotation; operational performance; economic analysis; equipment performance evaluation
- 摘要:
- 随着季节性藻华事件的频发，越来越多的给水厂将气浮工艺应用到水处理中。以国内4 套典型给水厂的气浮设备为研究对象，利用高速摄像机等评估气泡特性及对污染物的去除效果，并进行气浮设备的性能评估及运行能耗规律研究。结果表明，气浮设备整体运行情况基本正常，各水厂气浮设备的溶气效率为58.4%~78.7%，气泡平均粒径均低于30 μm，气泡稳定时间大多在240 s以上；对浊度和藻类的去除效果较好，去除率分别为50.70%~77.66%和77.41%~86.31%，对TOC、UV254、CODMn的去除率不高，但可以起到减轻后续工艺单元运行压力的作用；同时，气浮工艺运行产生的较高电能和药剂消耗，能够通过其他指标的降低相互抵消，投资成本仅增加了0.024~0.030 元/m3。综合考虑运行性能、经济性和出水水质等因素，气浮工艺对城镇给水厂处理低浊高藻水具有较好的适用性。
- 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.
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