WANGYue,LIUDuo,ZHENGYa-wen,et al.Adaptability of Air Flotation Process for Treating Source Water from South-to-North Water Transfer Project in a Waterworks in North China[J].China Water & Wastewater,2025,41(1):46-51.
北方某水厂气浮工艺处理南水北调水源水的适应性
- Title:
- Adaptability of Air Flotation Process for Treating Source Water from South-to-North Water Transfer Project in a Waterworks in North China
- Keywords:
- sedimentation; air flotation; source water from the South-to-North Water Transfer Project; high concentration algae
- 摘要:
- 针对北方某水厂侧向流斜板沉淀工艺对南水北调水源水（简称“南水水源水”）处理效果不佳的问题，探索了气浮工艺处理南水水源水的可行性。通过探究影响气浮中试系统运行效果的因素，综合考虑气浮工艺的处理效果及能耗，确定中试系统的回流比为7%~9%、溶气压力为0.25 MPa。与该水厂沉淀工艺相比，气浮工艺对南水水源水质的季节性变化适应较好，并且对水质剧烈波动具有良好的耐冲击性，运行期间气浮池出水浊度为0.21~0.75 NTU、CODMn为0.6~1.6 mg/L。气浮工艺对藻类的去除效果优于现行沉淀工艺，在南水水源水中藻类数量为（65.6~543.7）×104 个/L条件下，气浮工艺和沉淀工艺的除藻率分别为82.9%~97.7%、29.3%~86.8%。气浮工艺可有效降低出水残余铝浓度，出水铝浓度为0.20~0.33 mg/L，比沉淀工艺出水低50%左右，但二者对消毒副产物的去除效果无显著差别。
- Abstract:
- Due to the poor treatment performance of source water from the South-to-North Water Transfer Project by the lateral flow inclined plate sedimentation process in a waterworks in North China, the feasibility of treating the source water through air flotation process was examined. By exploring the factors influencing the operation effect of the pilot-scale air flotation system and considering the treatment efficiency and energy consumption of the process, the reflux ratio of the system was determined to range from 7% to 9%, and the dissolved air pressure was 0.25 MPa. Compared to the sedimentation process of the waterworks, the air flotation process was more adaptable to the seasonal variation of the source water quality and had a superior resistance to sharp fluctuations in water quality. The turbidity of the effluent from the air flotation process was 0.21-0.75 NTU, and the CODMn was 0.6-1.6 mg/L during operation. In the source water with algae density of (65.6-543.7)×104 count/L, the removal efficiencies of algae by air flotation and sedimentation processes were 82.9%-97.7% and 29.3%-86.8% respectively. The air flotation process could effectively reduce the residual aluminum in the effluent, and the effluent aluminum concentration was 0.20-0.33 mg/L, which was about 50% lower than that of the sedimentation process. However, there was no significant difference in the removal performance of disinfection by-products between the two processes.
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