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Water Practice & Technology © IWA Publishing 2006 |
doi10.2166/wpt.2006.047
Different pollutants removal efficiencies and pollutants distribution with particle size of wastewater treated by CEPT process
G R Xu1, Y P Zhang1, J Gregory2
1School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, P.R. China
2Dept. of Civil and Environmental Engineering, University of London, Gower Street, London. WC1E 6BT
ABSTRACT
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 were closely related. For contaminants in wastewater associated with particles larger than 1.2µm, the removal efficiency was very high; on the contrary, it was difficult for CEPT to remove particles smaller than 0.2µm. The removal capabilities of CEPT also correlate to the pollutants characteristics. Therefore CEPT had effective removal efficiency for total phosphorus and pollutants associated with particles larger than 1.2µm.
Keywords: CEPT; particle size distribution; pollutants; wastewater
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