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DOI : 10.17640/KSWST.2016.24.4.15 ,    Vol.24, No.4, 15 ~ 21, 2016
Study on Removal Efficiency of Suspended Solids and Organic Nutrient in Initial Rainfall and Overflow Using Sewage Excess Sludge
여인설 Inseol Yeo , 조은영 Eunyoung Jo , 박승민 Seungmin Park , 강광남 Gangnam Kang , 김완수 Wansoo Kim , 정헌회 Hunhoi Jung , 박찬규 Changyu Park
In this study, it was conducted precedent studies to select the optimal operating conditions of the integrated high-efficiency lamella typed flocculent settler using the excess sludge in order to effectively cope with the pollution caused by the initial rainfall and overflow. All experiments were performed in lab scale jar test with sampling water, coagulant and excess sludge. Coagulant was selected the poly aluminum chloride (PAC, 17%) and its injection amounts were 5, 10, 15 and 20 ppm. Dosages of excess sludge were 5, 10, 15 and 20 g/L. After proceeding jar test, it was confirmed removal tendency of COD, SS, T-P, PO₄-P and T-N. In the results, when the amount of PAC injection was increased without excess sludge, removal rate of COD, SS, T-P and PO4-P gradually had increased except T-N. In case of removal tendency depended on dosage of excess sludge, removal rate of COD was more effective with 5 and 10 g/L dosage than 0 g/L but concentration of COD was increased when sludge dosage was above 15 g/L. Even though SS was effectively removed with excess sludge, it was slightly decreased when excess sludge’s dosage was increased. In case of T-P and PO₄-P, the more amount of excess sludge injected, the more they could remove. However, T-N was not made any removal by the flocculation with coagulant and excess sludge. Thus, based on the results, it is considered optimal operating conditions when 20 ppm PAC injected with 5 g/L excess sludge.
Key Words
Initial rainfall and overflow, Lamella type flocculation settler, Coagulation, PAC, Excess sludge
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