Pilot Plant Study On Advanced Purification Of Drinking Water

With the intensification of water pollution and enhancement of water quality standard, the conventional water treatment process is unable to meet people's requirement on the quality of drinking water gradually, so advanced treatment technology is being paid more and more attention.A pilot plant included pretreat, conventional treatment and advanced treatment was conducted. Considering the micro-polluted source water in Beijiang, the treatment effect was studied by means of nine processes combined by conventional treatment, pre-ozonation+conventional treatment and pre-ozonation+conventional treatment+OBAC. Treatment effect in different depth of carbon bed using activated carbon and biological activated carbon (BAC) was analyzed. Conventional treatment, GAC process and OBAC process was simulated to treat the source water polluted by phenol, and on basis of the research, mechanism of ozone and activated carbon was also studied.The results showed that, pre-ozonation could improve the coagulation effect, and oxidate partial organic matter, OBAC process inosculate ozonation, actived carbon and biodegradability. The"pre-ozonation+conventional water purification+OBAC"had high removal efficiency of CODMn,UV₂₅₄,TOC and NH₄⁺-N, the CHCl₃ residue concentration in effluent after chlorination disinfection was lowest. So it is a preferable combined process, which can effectively improve the quality of drinking water and ensure its safety. The simulating treatment results showed that conventional treatment process failed to guarantee the treated quality when the source water was polluted by phenol, but activated carbon can remove phenol effectively, and OBAC process had futher efficiency in removing phenol, though the efficiency was lower than GAC process. As the depth increased, the concentration of CODMn decreased linearly in the GAC activated carbon filter,and the concentration of CHCl₃ increased in the upper carbon filter of GAC and BAC, the concentration was highest in the depth of 1000¹500mm, and then the concentration of CHCl₃ will be decreased. In addition, in the same depth, the concentration of CODMn in BAC was lower than GAC carbon filter.The pilot plant research can be used for reference for production practice...