气浮与多种常规工艺联用对低温低浊水的处理效果分析  

Effect Analysis of Combined Air Flotation and Multiple Conventional Processes on Low Temperature and Low Turbidity Water Treatment

作　　者：童佳佳 张秋勉 李纲 王恕皆 TONG Jiajia;ZHANG Qiumian;LI Gang;WANG Shujie(Hangzhou Xiaoshan Water Supply Co.,Ltd.,Hangzhou 311203,China)

机构地区：[1]杭州萧山供水有限公司,浙江杭州311203

出　　处：《净水技术》2023年第4期191-196,共6页Water Purification Technology

摘　　要：针对低温低浊水给水厂运行带来的困难,采用气浮单元与水厂各常规工艺联用,以得到最佳联用方案。利用萧山南部某水厂冬季低温低浊水,在水厂配水井、反应池末端、沉淀池中段、沉淀池末段以及砂滤池后端串联中试气浮单元,比较分析水厂各常规工艺与气浮单元联用后对低温低浊原水的处理效果,讨论气浮工艺替代水厂常规工艺的可能性。结果表明:气浮直接处理预氧化后的原水,浑浊度平均去除率高达约76.9%;混凝气浮后,聚合氯化铝投加量为5~10 mg/L时,浑浊度平均去除率均在95.0%以上,对金属指标也能达到较好的处理效果,但对有机物指标去除效率较低。这说明气浮单元的微气泡工艺对于黏度大、颗粒物稳定的低温低浊原水或常规工艺过程水处理有独特的优势。水厂应根据原水特点,将气浮装置设置于不同位置,保证气浮工艺处理效果。In order to solve the difficulties for low temperature and low turbidity water treatment and operation of WTPs,the combined air flotation and the conventional processes are considered to obtain the best solution.The air flotation units were connected in series at the water distribution well,the end of the reaction tank,the middle section of the sedimentation tank,the end section of the sedimentation tank and the back end of the sand filter tank,and the low temperature and low turbidity water of a WTP in the south Xiaoshan was used.The treatment effect of each scheme of conventional process combined with air flotation unit was compared and analyzed.The possibility of air flotation process replacing the conventional process of WTPs was discussed.Results showed that the air flotation unit had unique advantages for low temperature and low turbidity raw water with high viscosity and stable particles or water treatment in conventional process.Among them,about 76.9%of the average turbidity removal rate could be achieved by direct air flotation treatment;95.0%of the average turbidity removal rate could be achieved through the coagulation air flotation process under the dosage of polyaluminium chloride was 5~10 mg/L.Expected treatment effect could also be achieved through air flotation process for metal indices.The removal effect of organic matter was poor through the air flotation process.According to the characteristics of raw water,the WTPs should set the air flotation device in different positions to ensure the effect of air flotation process.

关 键 词：低温低浊 水厂 气浮工艺 微气泡 混凝沉淀 

分 类 号：TU991[建筑科学—市政工程]