Study On Performance Of Ultrafiltration Membrane In Treating Drinking Water

In order to obtain the drinking water of higher quality and more safety,ultrafiltration membrane(UF) was adopted to treat the effluent from coagulation precipitation and biological activated carbon process, and compared it with sand filter.The efflent from biological activated carbon process was treated by the UF. The results showed that the UF could effectively filter particulate matter, bacteria and some organic matter.The effluent could meet the drinking water quality standard. Compared with the traditional sand filtet,the turbidity of the effluent from the UF was comparable but water quality was more stable, and the number of bacteria was much lower, which could effectively prevent the biological leakage.The efflent from coagulation precipitation process was treated by the UF. The results showed that the UF could filter more than 97% turbidity and keep the number of bacteria at 3.5 per milliliter, which presented higher filtering performance to remove turbidity and bacteria, but less removal of CODMn and TN(including ammonia nitrogen, nitrate and organic nitrogen). Compared with the UF treating the effluent from biological activated carbon,there was a higher removal efficiency forturbidity and bacteria,but a lower removal for CODMn.The performance of the UF was evaluated in the winter and the results showed the performance was roughly equal as compared with that in normal temperature, but there was a higher removal for bacteria, which indicated the UF was completely suitable under the lower temperature in the winter. Compared with sand filter, there was a higher removal of turbidity and bacteria for the UF, but there was a less removal of CODMn and TN, which is weakly higher than that for sand filtration.