| Title |
A Study on Optimum Design for Swine Wastewater Treatment Plant |
| Authors |
황규대 ; 윤치웅 ; 김복현 ; 조종복 ; 정윤진 ; 백성기 ( Gye Dae Whang ; Chi Woong Yoon ; Bok Hyun Kim ; Jong Bok Cho ; Yoon Jin Chung ; Sung Gi Baek ) |
| Abstract |
Wastes from hog farms can contribute considerable pollution loads to receiving streams because it contains high concentration of organic matters and nutrients. Therefore it is required to discharge after proper treatment. The objective of this study was to determine the optimum treatment conditions and to evaluate design parameters for a swine wastewater treatment plant. Three bench scale activated sludge units and two rotating biological contactor units were operated by using swine wastewater. Settling characteristics of suspended solids were very poor, and after 2 hour settling time, removal efficiency of organic matters and suspended solids were about 15% and 23%, respectively. Among the coagulants treated to improve the settleablity of suspended solids, ferric chloride showed the best result at dose concentration of 525㎎/ℓ. The activated sludge unit operated at 6 hours of HRT and 16 days of SRT produced the best quality of effluent. The kinetic coefficients, yield coefficient(Y₁), and decay coefficient(k_d), were 0.32㎎ MLSS/㎎ COD and 0.079 day ^(-1), respectively. RBC process showed about 90% SCOD and 86% TKN removal efficiency. The hydraulic loading did not affect the SCOD removal efficiency significantly. The kinetic coefficients, loading rate(P) and substrate saturation constant(Ks) were 13.7g SCOD/㎡/day and 32.7㎎ SCOD/ℓ, respectively for SCOD removal, and 0.73g TKN/㎡/ day and 25㎎ TKN/ℓ, respectively for TKN removal. Experimental results indicated that RBC process required much larger area than activated sludge process to produce the same quality of effluent. |