不同预处理/超滤工艺的除污特性及氯消毒效能

研究了直接超滤、粉末炭/超滤、混凝/超滤三种工艺的除污特性和相应的氯消毒效能。结果表明:三种超滤工艺的除浊率均能达到99%以上,但直接超滤工艺对溶解性有机物、氨氮、氯消毒副产物前体物的去除效果较差,粉末炭/超滤和混凝/超滤工艺集合了超滤和预处理工艺的优点,除污效能得到强化。由于微生物个体生长和挤压变形,超滤膜后仍有少量菌落检出,加氯1.0 mg/L后,三种超滤工艺的出水水质在48 h内均优于国标要求;粉末炭/超滤、混凝/超滤组合工艺均能降低氯消毒副产物生成势,且对HAAFP的去除效果较THMFP的好。

Pollutant Removal Characteristics and Chlorine Disinfection Efficiency of UF Processes

The pollutant removal characteristics and chlorine disinfection efficiency of three kinds of ultrafiltration processes such as direct ultrafiltration,powdered activated carbon(PAC)/ultrafiltration and coagulation/ultrafiltration were studied.The results show that the removal rate of turbidity by the three kinds of ultrafiltration processes can reach more than 99%.However,the removal efficiency of dissolved organic pollutants,ammonia nitrogen,chlorine disinfection by-products precursors by direct ultrafiltration process is poorer,PAC/ultrafiltration process and coagulation/ultrafiltration process combine the merits of ultrafiltration and pretreatment process,and their pollutant removal efficiencies are enhanced.Because of the growth and extrusion of microorganisms,there is still a small amount of super-colonies detected after membrane.But after adding chlorine of 1.0 mg/L,the effluent quality of these three processes is better than the national standard within 48 h.Both of the two UF combined processes can reduce the formation potential of chlorine disinfection by-products,at the same time,the removal efficiency of HAAFP in the two processes is better than THMFP.