摘要
以天津某水库含嗅味物质原水为研究对象,利用小试研究了以传统混凝沉淀过滤为主体工艺的3座净水厂采用该水源进行应急供水的适宜处理方式。试验结果表明,粉末炭对原水中2-MIB和土臭素均具有较好吸附作用,其吸附效果主要受粉末炭投量和吸附时间影响,增加粉末炭投量和吸附时间可以提高二者去除率,根据去除率推算30 mg/L粉末炭吸附50 min最多可去除60 ng/L溶解态2-MIB和230 ng/L溶解态土臭素,吸附180 min最多可去除120 ng/L溶解态2-MIB和480 ng/L溶解态土臭素,2-MIB去除难度要高于土臭素;传统混凝沉淀过滤工艺可以去除大部分结合态嗅味物质,3座水厂采用厂内投加粉末炭后进行混凝沉淀过滤相对于直接混凝沉淀过滤而言,可以提高对2-MIB和土臭素的去除效果,但其效果提升主要受限于吸附时间,可应对的嗅味物质浓度较低;采用水库出口处投加粉末炭,可以增加吸附时间,明显提高2-MIB和土臭素的去除效果,该方式最终能处理的溶解态嗅味物质浓度基本与粉末炭吸附推算的浓度一致,满足安全供水需求。
The appropriate treatment of the raw water containing taste and odor compounds are studied in a reservoir of Tianjin for emergency water supply in three water purification plants with traditional coagulation-sedimentation-filtration process by a bench-scale test.The results showed that the powdered activated carbon(PAC)had an adsorption effect on 2-MIB and geosmin,and the adsorption effect was mainly affected by the powder activated carbon dosage and adsorption time.The removal rate of both could be improved by increasing the PAC dosage and adsorption time.According to the removal rate,it was estimated that 60 ng/L dissolved MIB and 230 ng/L dissolved GSM could be removed at most by adsorption of 30 mg/L PAC for 50 min.Adsorption for 180 min could remove up to 120 ng/L dissolved MIB and 480 ng/L dissolved GSM,and removal of MIB was more difficult than that of GSM.Traditional coagulation-sedimentation-filtration process could remove most of the bound taste and odor compounds.Compared with direct coagulation-sedimentation-filtration,the removal effect of 2-MIB and GSM could be improved using the coagulation-sedimentation-filtration after adding PAC in the three water plants,but the improvement of the effect was mainly limited by the adsorption time,and the concentration of taste and odor compounds that could be handled was low.Adding PAC at the outlet of the reservoir could increase the adsorption time and significantly improve the removal effect of 2-MIB and GSM.The concentration of dissolved taste and odor compounds treated by this method was basically the same as that calculated by the adsorption of PAC,which meets the demand of safe water supply.
作者
闫慧敏
韩正双
白雪娟
陈静梅
YAN Hui-min;HAN Zheng-shuang;BAI Xue-juan;CHEN Jing-mei(Tianjin Public Utility Design&Research Institute,Tianjin 300100,China)
出处
《海河水利》
2024年第6期91-97,共7页
Haihe Water Resources
关键词
2-MIB
土臭素
应急处理
粉末炭投量
吸附时间
混凝沉淀
2-MIB
geosmin
emergency treatment
powder activated carbon dosage
adsorption time
coagulation sedimentation
