교반강도가 퇴비화에 미치는 영향

Effect of Mechanical Mixing Intenstiy on Composting

본 연구의 목적은 유기성폐기물 퇴비화시 교반강도가 퇴비화공정에 미치는 영향을 알아보기 위한 것이다. 주된 연구지표는 교반강도와 초기수분함량이었다. 본 연구를 위하여 기계식 교반장치를 갖춘 실험실규모의 퇴비화반응조가 이용되었다. 실험대상폐기물은 생분뇨슬러지와 감압증발처리공정을 거친 분뇨슬러지, 그리고 돈분을 이용하였다. 초기수분함량이 60%와 63% 인 경우 연속교반시 간헐교반보다 유기물분해율이 더 높게 나타났다. 또한 시료의 물리적 성상도 연속교반이 간헐교반보다 더 균등질의 양호한 상태를 나타내었다. 한편 초기 수분함량 68%인 경우는 혼합되기 보다는 시료 일부가 반죽상태를 형성하는 문제가 발생하였으며 유기물분해율도 연속교반의 경우가 간헐교반보다 더 낮게 나타났다.

The purpose of this study was to investigate the effect of mechanical mixing intensity on composting. The major parameters investigated were the mixing intensity and initial moisture content. Laboratory scale composting reactors with mixing equipment were used in this study. Wastes used for the study were raw nightsoil sludge, nightsoil sludge after vacuum evaporation treatment and pig manure. When moisture contents were 60% and 63%, amount of organic material degraded in the continuous mixing reactors was higher than that in the intermittent mixing reactors. Compost produced from reactors with continuous mixing had better texture than that obtained from reactors with intermittent mixing. When moisture content was 68%, organic waste was kneaded rather than mixed in the continuous mixing reactors. Amount of organic material degraded in the continuous mixing reactors also was lower than that in the intermittent mixing reactors.