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영어

Sewage treatment facilities for small community were investigated to 1,404 place in whole country, and the facilities capacity was observed that correspond to 0.44% among whole sewage facilities capacity (22,469,000m3/day) by 98,402m3/a day. As the discharge quality of small scaled-sewage treatment showed better quality when the treatment capacity was big from all regulation item. Removal efficiency of BOD 91.2%, SS 92.2%, T-N 47.9% and T-P 55.1% was seen in facilities of more than 200m3/d, and facilities of less than 50m3/d showed low removal efficiency by BOD 86.9%, SS 87.9%, T-N 40.7% and T-P 45.0%. It is judged that relatively bigger treatment facility was showing good removal efficiency because those bigger facility was operated well than that of small scaled treatment facility. In the case of sewage treatment facility less than 50m3/d of capacity will be admitted to public sewerage after 2010 and then will be regulated by stringent new discharge regulation. However, because the sewage flow rate from the less than 50m3/d capacity is small quantity, the polluting effect to receiving body of water was not great and it is hard to satisfy water criteria because most existing small scaled facilities was designed by BOD and SS removal first.