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DOI : 10.17640/KSWST.2018.26.6.73 , Vol.26, No.6, 73 ~ 81, 2018
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| Title |
| Evaluation of Solids Removal Characteristics on Sewage Treatment Plants Using T-P sludge Return into the Primary Settling Tank |
| 김종오 Jong-oh Kim , 정동기 Dong-gi Jung , 권혜정 Hye-jeong Kwon , 황준석 Joon-seok Hwang |
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| Abstract |
| In this study, the solids removal characteristics using T-P sludge generated from PACl coagulation were analyzed by laboratory scale and full scale experiment. As the amounts of T-P sludge injection into the raw sewage influent increased at the rate of 0, 1, 2, 3, 4 %, the suspended solids concentrations after 20 minutes setting test decreased to 210, 137, 91, 64, 43 mg/L, respectively. The filtration time required for dewatering test of the raw sewage influent decreased to 982, 728, 658, 581, 492 sec for 0, 1, 2, 3, 4% of T-P sludge injection, respectively. As the amounts of PACl coagulant into the effluent from final setting tank increased at 0, 10, 20, 30, 40 mg/L, the required filtration times for T-P sludge increased into 12.3, 41.7, 53.7, 67.2, 79.5 sec and the dewaterability of T-P sludge decreased. After T-P sludge returned into the primary settling tank on J-si sewage treatment plants, the effluent concentrations of COD, SS, T-N and T-P from primary settling tank into bioreactor decreased by 35.9, 27.9, 22.2, and 52.6% due to the coagulation effects of the T-P sludge. Finally, it was found that the return of T-P sludge into the primary settling tank could result into the sludge reduction having a lower water content of 3.03% p than in case of the only T-P sludge dehydration. |
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| Key Words |
| Filtration time, PACl, Primary settling tank, Solids removal, T-P sludge injection |
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