| Title |
A Study on the Biological Treatment Process of Condensate Generated from the Night Soil Treatment by Depressurizing Evaporation Process |
| Authors |
황규대 ; 정원식 ; 김복현 ( Gye Dae Whang ; Won Sick Chung ; Bok Hyun Kim ) |
| Abstract |
Depressurizing evaporation process was developed for the treatment of night soil. It is a compact treatment process, and can be built in a small area without malodor generation. However it produces condensate which contain high concentration of organic material and ammonia nitrogen. This study was performed to determine the optimum treatment conditions for the activated sludge and rotating biological contactor process, which were selected as secondary treatment unit for condensate. Six bench scale activated sludge units and rotating biological reactors were operated. Three units received undiluted wastewater and the remaining three units received wastewater diluted with tap water. The dilution ratio was 1 : 1. Test results indicated that the activated sludge unit which received diluted wastewater and was operated 12hours of HRT and l0days of SRT produced the best quality of effluent. The SCOD and NH₃-N removal efficiency were 95% and 18%, respectively. The kinetic coefficients, yield coefficient(Y), and decay coefficient(Kd), were 0.251㎎MLSS/㎎COD and 0.121day ¹, respectively. For RBC process, the unit received diluted wastewater and was operated with hydraulic loading of 30 liter per day produced the best quality of effluent. The SCOD and NH₃-N removal were 90% and 38%, respectively. |