부재료가 돈분뇨 퇴비화에 미치는 영향

Abstract

This paper presents an experiment to examine the possibility of treating carcass while makingcompost with a horizontal cylinder composting equipment. The findings were as follows: as forheavy metal content, zinc content was above the allowed level in some measuring sections ofthe general operation and the entire measuring sections of the carcass operation, whose coppercontent was higher than the general operation. The wood chip operation was lower than theallowed level in all the heavy metals and similar or the same as the carcass operation incopper, cadmium and arsenic. Its nickel content was 29.5~63.8%, which was relatively higher than 9.3~18.0% and 15.8~18.0% of the general and carcass operation, respectively. Its chromecontent was 14.2~31.9%, which was relatively higher than that of the general and carcassoperation. The integrated operation was lower than the allowed level in all the heavy metals. Itscopper and zinc content was 34.9~54.5% and 53.1~75.9%, which was similar to 48.9~52.6%and 64.6~85.9%, respectively, in the wood chip operation. Its chrome and nickel content wasstabilized while their content was rather high in the wood chip operation. The average and finalmoisture content of the carcass operation was 60.7% and 49.6%, respectively. Its averagemoisture content was a little bit higher than the recommended level of 55.0%, but its finalmoisture content was lower than the recommended level. The average and final moisture contentof the integrated operation was 29.2% and 18.6%, respectively, which was the lowest levelamong the four operation modes. The overall moisture content of the operation modes wasunder the recommended level of 55.0% with some variance among the modes. The C/N ratiowas the lowest in the carcass operation and the highest in the general operation. The averageC/N ratio of the operation modes was in the range of 13.7~20.3 with the total average of 18.3,and the modes kept it under the proper level of 30.0.