Water Treatment of High Turbid Source by Tubular Ceramic Microfiltrationwith Periodic Water-Backflushing System

摘要

In this study, periodic water-backflushing using permeate water performed to minimize membrane fouling and to enhance permeate flux in tubular ceramic MF system for water treatment of high turbid source. And the optimal conditions were discussed in the viewpoints of permeate flux J, resistance of membrane fouling R_f and total permeate volume V_T. As a result, FT=2 min with periodic 6 sec water-backflushing showed the highest value of J, and the lowest value of Rf, and we acquired the highest V_T of 68.05 m~3. Also in the results of BT effect at fixed FT= 10 min, BT=20 sec showed the lowest value of Rf and the highest value of J, and we could be obtained the highest V_T of 66.60 m~3. Consequently FT=2 min and BT=6 sec could be the optimal condition in water treatment of high turbid source above 10 NTU. However FT=10 min and BT=20 sec was superior to reduce operating costs because of lower backflushing frequency. Then the average quality of water treated by our tubular ceramic MF system was Turbidity = 0.07 NTU, COD_(Mn) = 1.86 mg/L and NH_3-N = 0.024 mg/L, which were satisfied with Korean drinking water standard, TDS = 30 mg/L, T-N =1.107 mg/L and T-P = 0.003 mg/L.