축산퇴비를 이용한 돼지사체 매몰처리의 pilot 규모 평가 및 악취물질 배출특성

Abstract

Contaminated livestock disposal method includes burial method using soil. But the slow rate of decay process of carcasses has caused various problems. In this study, 4 pig carcasses (80 similar to 90 kg/pig) were buried in livestock compost as a cover material to improve carcasses decaying rate. The result of experiment showed the temperature of the carcass layer remained 40 degrees C or higher even when the outside temperature dropped below zero. After the experiment, it was confirmed that carcasses in the compost burial was decomposed substantially than the carcasses from soil burial. The moisture content of the compost burial was 40 similar to 65%. The pH was affected by ammonia produced by decaying carcasses and the pH level was increased from pH 8.7 similar to 8.9 at the beginning of the experiment to 9.3 similar to 9.7 at the end of the experiment. The residues of typical odor components in the compost layer were decreased after volatilized and due to decaying carcasses strong odor was observed. The odor intensity evaluation by measured odor substances and olfactory evaluation showed overall favorable correlation, and among the measured odor substances the reduced sulfur compounds (RSC) were found to be dominantly contributing to malodorous substances of decaying carcasses. The above results proved rapid decay rates due to the thermal effects of livestock compost.