Changes of Physico-chemical Properties of paper Mill Sludge amended with Pig Manure in Composting Process

제지슬러지와 돈분을 이용한 퇴비화 과정중 이화학적 특성 변화

This study was conducted to determine the optimal mixing ratio of the paper mill sludge(PMS) and pig manure(PM). Since the former contains lots of total carbon and low nitrogen, it was used as carbon source. Also, dried paper mill sludge(DPMS) was added to the mixture to control the water content. The treatments was composed of four as follows, PMS-100(PM 0%+PMS 80%+DPMS 20%), PMS-85(15+65+20), PMS-70(30+50+20), and PMS-55(45+35+20). The mixtures were composted under aerobic condition in $1.25m^3$ static piles. The piles were aerated for 15 minutes per day and turned over the mixture once a week at the early stage of composting. To estimate the maturity of composts, the changes of physico-chemical properties such as temperature, pH, C/N ratio and color were monitored every week. The 25-30 and 55-60% as optimal condition of C/N ratio and moisture content were respectively recommended for effective composting by the evaluation of the changes of phsico-chemical properties for materials taken from compost files during the composting period. When the 30 and 45% of PM were mixed with PMS, the maturity time at least demanded to the stable state were shortened and the qualify of the final product was improved in a view of nutritional components.

본 연구는 퇴비화에 있어서 제지 슬러지(PMS)와 돈분(PM)의 최적혼합비율을 결정하기 위해 실시하였다. 제지슬러지는 풍부한 탄소와 적은 질소를 함유하고 있기 때문에 탄소의 공급원으로서 사용되었다. 또한 건조된 제지슬러지는 혼합물의 수분을 조절할 목적으로 첨가되었다. 처리구는 PMS-100(PM 0%+PMS 80%+DPMS 20%), PMS-85(15+65+20), PMS-70(30+50+20), PMS-55(45+35+20) 4개로 구성되었다. 퇴비화은 호기성조건에서 정체식(규모 $1.25m^3$)으로 실행되었으며, 일일 15분씩 공기를 공급하였고 퇴비화초기에는 주마다 뒤집기를 실시하였다. 퇴비의 부숙도를 평가하기 위해 온도, pH, C/N율과 색도의 이화학성 변화를 조사하였다. 이화학성을 분석한 결과 효과적인 퇴비화을 위한 수분과 C/N율의 최적조건은 각각 25~30과 55~60%이었다. 제지슬러지에 돈분이