超滤深度处理河网地区湖泊水源水中试

Ultrafiltration in Advanced Treatment of Raw Water from Lake in River Region

针对河网地区微污染水源的水质问题,采用超滤深度处理江苏里下河高邮湖水源水。结果表明:膜出水浊度基本维持在0.1 NTU以下,粒径>2μm的颗粒数平均为14个/mL,细菌未检测出。膜出水CODMn、UV254、DOC平均值分别为2.50 mg/L、0.079 cm-1和4.16 mg/L,平均去除率分别为43.97%、18%和24%。采用正冲+反冲+正冲的水力清洗方式可稳定超滤膜的运行,氢氧化钠、次氯酸钠和柠檬酸的复合化学清洗方式可使膜通量恢复率达98%。

In order to solve the problem of micro-pollution in a river region, advanced treatment of raw water from Gaoyou Lake was performed using uhrafiltration. The results showed that membrane permeate turbidity remained below 0.1 NTU, the average density for particles larger than 2 μm in the membrane permeate was 14 p/mL, and bacteria were not detected. The average CODMn, UV254 and DOC in the membrane permeate were 2.50 mg/L, 0. 079 cm^-1 and 4.16 mg/L, and the average removal rates were 43.97% , 18% and 24% , respectively. The hydraulic cleaning forward flush, backwash then forward flush could stabilize the operation of uhrafihration membrane. The complex chemical cleaning method of sodium hydroxide, sodium hypochlorite and citric acid could recover 98% of membrane flux.