양돈분뇨의 열전처리에서 기질과 접종액의 비율이 메탄생산 퍼텐셜에 미치는 영향

Abstract

This study was carried out to investigate the effect of substrate to inoculum ratio on ultimate methane potential () from piggery wastes. BMP(Biochemical methane potential) assays were executed for the three samples that have different organic characteristics (Filtrate of pig slurry, LF; Thermal hydrolysate of piggery sludge cake, TH; Mixture of LF and TH at the ratio of 4 to 1, Mix), and values obtained from BMP assays were compared with the theoretical methane potential () of each samples. While values (0.27, 0.44, and ) of TH sample that was pretreated with thermal hydrolysis were below the at all S/I ratios (0.1, 0.3, and 0.5), and values of LF (0.64 and for the S/I ratios of 0.1 and 0.3, respectively) at the lower S/I ratios of 0.1 and 0.3 exceeded the values (). And also biodegradability () of LF sample were obtained as 152.07%, 122.67%, and 95.71% at the S/I ratios of 0.1, 0.3, and 0.5, respectively, and unreasonable values were presented at lower S/I ratios of 0.1 and 0.3. and of Mix sample showed a similar tendency with those of LF sample. Therefore, TH sample by thermal hydrolysis pretreatment showed lower anaerobic biodegradability than those of other samples (LF and Mix) and ultimate methane potentials of LF and Mix samples were overestimated in the lower S/I ratio of 0.1 and 0.3.