Abstract
To treat piggery wastewaters containing refractory compounds including nitrogen, biological treatments were investigated. In biological treatment, the removal efficiencies of organics and nitrogen by the activated sludge process and bioreactor using a BACC (Biological Activated Carbon Cartridge) media filled with granular activated carbon were examined. The results were as follows; in the biological process, when the approximate influent BOD concentration of 620 mg/L, through dilution, was treated by the activated sludge process, the process should be operated at a HRT of over 8 days to maintain an effluent BOD concentration of lower than 100 mg/L. In the treatment of piggery wastewater using a BACC bioreactor, when the HRT was 200 hours, the BOD, COD(sub)cr, and TKN removal efficiency of the effluent were 94, 75 and 64.3%, respectively. Comparing the BACC bioreactor with the activated sludge process, when the volumetric loading rate was 0.3 g BOD/L.day, the specific substrate removal rate of BOD was 0.14 g BOD removed/L.day in the activated sludge process which compared with 0.27 g BOD removed/L$.$day in the BACC bioreactor. The BACC bioreactor showed on average a 2-fold higher removal rate and was superior to the activated sludge process in wastewater treatment in terms of variations of loading time and high loading time. Therefore, the BACC process can effectively treat piggery wastewater containing high concentrations of nitrogen and organic compounds.
질소를 포함한 난분해성 오염불칠을 다량 함유한 축산폐수 (양돈폐수)의 오염물질을 효과적으로 처려를 위해서 생물학적 인 처리방안으로 활성슬러지 공정 및 입상활성란이 채워친 BACC 담제를 이용한 생물반응가에서의 유기물질 및 질소의 제거능에 때하여 조사하였다. 축산폐수를 일반 활성슬러지 공정으로 처려 할 경우 유압수를 희석하여 BOD 유입농도 약 600 mgfL의 폐수를 처리할 때 유출수의 BOD를 100 mgfL 이하로 유지하고자 할 경우 체류시간올 8일 이상 운전 해야하는 것으로 나타났다. 그러나 BACC 생물반응기에서 축산폐수를 처리할 때 체류시간이 200 시간일 때 유출수획 BOD, $COD_{Cr} $, TKN의 농도는 각각 94, 75, 64.3%의 제거효율을 나타내었다. BACC 생물반응기와 활성슬러지 공정을 비교 할 때 용적부하 0.3일 때 BOD 비기질제거속도가 활성슬러지 공정에서는 0.14 gBOD removedf L.day이고 BACC 생물반응기는 0.27 gBOD removed/L.day로서 통일부하에서 높은 제거효율을, 고부하에서도 안정된 제거효율을 나타내고 있기 때문에 BACC 생물반응기가 부하변통 및 고부하의 폐수처리에서 활성슬러지 공정보다 우수한 것으로 평가되었다.