天津某净水厂引江水强化处理技术研究

Enhanced treatment technology for Yangtze River water in a water purification plant in Tianjin

天津某净水厂主水源为南水北调中线工程引江水,该水厂在常规工艺基础上增设预臭氧、后臭氧和活性炭强化工艺,以期进一步提升出水水质。建立小试试验装置,对以上各工艺强化常规工艺处理引江水的效果展开探讨。结果表明,絮凝剂PAC和FeCl_(3)的最佳投加量均为17 mg/L;在常规工艺基础上增设预臭氧或后臭氧工艺可以有效提升有机物的去除效果,增设活性炭工艺可同时提升浊度和有机物的去除效果,同时增设后臭氧和活性炭工艺强化去除浊度和有机物的作用最显著。预臭氧和后臭氧的最佳投加量均为1.0 mg/L,当原水中溴离子质量浓度高达150μg/L时,常规-后臭氧工艺、预臭氧-常规-后臭氧工艺中臭氧的投加量应调整为≤0.5 mg/L。

The main water source of a water purification plant in Tianjin is Yangtze River water from Mid-route of South-to-North Water Transfer Project.On the basis of conventional processes,the plant has added pre-ozone,postozone and activated carbon enhancement processes to improve the quality of effluent.In this study,a small-scale experimental device was set up to investigate the effect of each process in enhancing of the conventional processes for treating Yangtze River water.The results indicated that the optimal dosages of flocculants PAC and FeCl_(3) were both 17 mg/L.The addition of pre-or post-ozone process to the conventional process could effectively enhance the removal of organic matter.The addition of activated carbon process could enhance the removal of turbidity and organic matter at the same time.The addition of post-ozone and activated carbon process could significantly enhance the removal of turbidity and organic matter.The optimum dosage for both pre-and post-ozone both were 1.0 mg/L.When the concentration of bromine ion in the raw water was up to 150 μ/L,the dosage of ozone in the conventional-postozone process and pre-ozone-conventional-post ozone process should be adjusted to ≤0.5 mg/L.