A Study on the Earlier Stabilization for the Landfill of Municipal Refuse

매립지의 도시폐기물 조기안정화 방안에 관한 연구

In this study, the period for stabilization in the case of recycling leachate was compared and analyzed with the case of non-cycle type, using lysimeters filled with municipal organic refuse. The lysimeters were operated with various detention time. In addition, the degree of stabilization was estimated by the way of measuring the quantity of gas from landfills. As the results, the recycle of leachate, which was modified as the neutral level of pH, accelerated the biological decomposition of organics with the raped growth of anaerobic bacteria in the system, and reduced the period for the stabilization. In the case of BOD and COD in leachate, COD. which had been originality similar to BOD, had increased more rapidly than BOD as time lapsed. Moreover, the quantity of gas from the recycle reactor was larger than from the non-cycle reactor. The shorter the detention time of leachate gas, the larger the quantity of gas produced in the lysimeters.

본 연구는 도시폐기물을 매립지에서 발생하는 침출오수를 실험실에서 유기질 도시폐기물을 충진한 모형매립반응조를 이용하여 각기 다른 체류시간에 따른 침출오수 순환방식과 비순환방식으로 운영했을 때의 안정화에 소요되는 기간을 비교 분석하였다. 그 결과 pH 조정(중성)에 의한 침출오수 재순환은 매립지내의 혐기성균을 급속하게 증대시켜 유기물의 생물학적 분해를 가속화시키고 안정화기간을 단축시켰다. 침출오수의 BOD와 COD의 경우 초기에는 COD=BOD 였으나, 매립기간이 경과함에 따라 COD>BOD, $COD{\gg}BOD$ 의 추세를 보였다. 가스발생량은 침출오수 비순환반응조보다 재순환반응조에서 더욱 많이 발생하였고 체류시간이 짧을수록 가스발생량이 증가하였다.