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.
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