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Survey of the Secondary Effluents from Municipal Wastewater Treatment Plants in Korea  

Kim, Youngchul (Hanseo University, Dept. of Environmental Engineering)
An, Ik-Sung (Dae kyong Co.)
Kang, Min-Gi (Hanseo University, Dept. of Environmental Engineering)
Publication Information
Journal of Korean Society on Water Environment / v.21, no.2, 2005 , pp. 158-168 More about this Journal
Abstract
In this study, the discharging effluents from have been 9 municipal wastewater treatment plants surveyed for 1 year-period. Statistics including probability distribution, cumulative occurrence concentration and other statistical parameters were presented. In addition, treatment performance and its stability were also discussed. Most of the plants, have an operational problem of high soluble organic content in the secondary effluent which may be associated with the integrated treatment of human and livestock manures. Nitrogen concentration in the effluents were usually higher during the period of summer and winter. It was found that this is mainly due to lack of the proper C/N ratio during the summer, or/and the effects of low temperature and less dilution by dry weather during the winter. Phosphorus concentration is sharply increased in June. Discussion with plant operators told that it is due to the dissolution of phosphate from the sludge accumulated in the primary settling tanks from the early spring to june. During this period, usually, sludge treatment line is highly overloaded with flush-outs of the sediments also stored in the bottom of combined sewer due to the low flow during winter season. Most of the plants can meet new effluent discharge limits of the nitrogen and phosphorus, and total coliform without further treatment.
Keywords
Municipal wastewater treatment plant; Treatment performance; Secondary effluent; Stability;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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