Different pollutants removal efficiencies and pollutants distribution with particle size of wastewater treated by CEPT process

摘要

The removal efficiency of different pollutants of wastewater treated by Chemically Enhanced Primary Treatment (CEPT) process and pollutants distribution with particle size were studied in this paper. The distributions of contaminants with particle size were studied using synthetic cellulose esters micro-porous filtering membrane of different porous size to separate the wastewater and samples after coagulation in sequence. Turbidity, UV254, COD, total phosphorus and ammonia nitrogen of the samples were measured. The results showed that the removal efficiency of the pollutants and their distributions with particle size are closely related. For contaminants in wastewater associated with particles larger than 1.2um, the removal efficiency is very high; on the contrary, it is difficult for CEPT to remove particles smaller than 0.2urn. The removal capability of CEPT also correlates to the pollutants characteristics. Therefore CEPT has effective removal efficiency for total phosphorus and pollutants associated with particles larger than 1.2um.