| Title |
Evaluation of Korean Water Quality Standards in Winter by Characteristics and Statistical Analyses of the Effluent Water Quality at the Sewage Treatment Plants in Korea |
| Authors |
엄철용 ( Chul Yong Um ) ; 주경훈 ( Kyoung Hoon Chu ) ; 윤주환 ( Zu Whan Yun ) ; 최익훈 ( Ik Hoon Choi ) ; 박재영 ( Jae Young Park ) ; 이한샘 ( Han Saem Lee ) ; 고광백 ( Kwang Baik Ko ) |
| Keywords |
Effluent quality standards; Sewage treatment plants; Total nitrogen; TN; Total phosphorus; TP; Winter season |
| Abstract |
In this study, from 2004 to 2008 influents and discharging effluents from 241 municipal public sewage treatment plants were surveyed. Statistics including average, Coefficient of Variation (CV) and Coefficient of Reliability (COR) for each season, time series analysis for removal efficiency and water quality of effluents, and a comparison of the effluent standards in Korea and other countries were presented. The average concentrations of TN and TP in influents. during winter season were 32.6 and 3.78 mg/L and during other season were 30.8 and 3.61 mg/L in 2008, respectively. The average TN concentration on the basis of the maximum monthly concentrations in the effluents during winter season ranged from 14.2~17.4 mg/L and during other season ranged from 12.2~14.8 mg/L. The TP concentration in the effluents depending on the each season was no big difference. TN removal efficiency decreased from Jan. to Feb. and TP removal efficiency decreased in Jan., Jun and July. Maximum COR during winter season were 0.61 but the COR for TN and TP during other season ranged from 0.96~1.48 and 1.09~1.81, respectively, due to big difference in the standard for TN and TP in effluents depending on the season. TN and TP standards for effluent of sewage treatment during winter season in Korea was much higher than those in other countries. Therefore the lower effluent standards during winter season is essential for the water quality improvement. |