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DOI : ,    Vol.2, No.3, 133 ~ 152, 1994
Title
Articles / Chemical Treatment for the Removal of Nitrogen and Phosphorus from Municipal Sewage Water
곽종운Jong W . Kwak,최정환Jeong H . Choi
Abstract
The main purpose of this paper is to illustrate how the chemical sewage treatment has been influenced on the removal of nitrogen and phosphorus from the municipal sewage water. A pilot system adjacent to a sewage treatment plant was designed to evaluate the efficacy in removing nitrogen and phosphorus. The chemical treatment step for this system included flocculation and sedimentation. In the test period of about four weeks, the pilot plant for chemical/biological treatment using a coagulant of prepolmerized Hi-PAX was operated in comparison with the conventional biological treatment. The appropriate dosage was 33 ㎕/ℓ to all tested process and the corresponding flow rate of sewage water to be treated was 500 ℓ/day. In our study, phosphorus was possible to remove up to 79% from 4.23 ppm of raw sewage water due to the precipitation with aluminium component from the coagulant used. Chemical precipitation had a positive effect on the denitrification because of a lower carbon to nitrogen ratio. In order to enhance denitrification rate, acetic acid as single carbon source was added to the reaction zone at equivalent rates, showing about 93% in the removal of nitrogen.
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