| 摘要: | 本研究之高溫固態厭氧消化採用滲漉迴流系統以促進基質之攪拌效應。豬糞與稻稈混合，可以調節消化進料之組成與孔隙率，進而增進滲漉迴流之作用。本實驗稻稈混合比率設定為豬糞乾重之0、50、100及150%，亦即豬糞500 g(含水率78.44%)分別與0、55、110及165 g之稻稈混合，以探討稻稈混合比對甲烷生成之影響。實驗之進料基質C/N爲14~30，VS含量爲17.68~31.21%，消化過程乙酸生成濃度爲7,849~10,884 mg/L，丁酸生成濃度爲5,068~6,987 mg/L，甲烷產量爲25~167 ml-CH4/g-feed VS，甲烷累積產量爲2,210~34,701 ml-CH4。實驗結果顯示出共消化之稻稈配比增加，可促進甲烷之產生量。然而，添加55 g稻稈於500g豬糞之實驗，消化反應後pH 陡升至7.91，氨氮濃度爲1,972 mg/L，其甲烷累積量、甲烷平均濃度及比甲烷產量卻為最差，符合文獻所指pH ≧ 8 時，反應槽內之氨氮濃度會相對提高，進而抑制甲烷之產出。A high temperature(55℃) solid-state anaerobic digestion system equipped with leachate recirculation apparatus was adopted in this study. Digestion of pig manure with rice straw was carried out that the rice straw may balanced the nutrition requirements for digestion and may provide the mass with porosity to facilitate the leachate recirculation.Un the study, four mix ratios of rice straw/pig manure (i.e., 0, 0.5, 1, and 1.5, based on dry weight of pig manure) were tested for methane generation. The mixture for digestion has a initial C/N ratio ranging from 14 to 30, and a initial VS 17.68 to 31.21%. During the digestion process, the concentration of acetate acid generated was found ranging from 7,849~10,884 mg/L, and propionate acid from 5,068~6,987 mg/L. Methane generation increased from 25 ml-CH4/g-feed VS to 167 ml-CH4/g-feed VS, and cumulative methane production from 2,210 ml-CH4 to 34,701 ml-CH4, indicating methane generation increased with the mix ratio of rice straw. However, Adding 55 gram of rice straw in pig manure of the experiment responses that pH sharp rises to 7.91 in the digestive process, meanwhile, the ammonia concentration is 1,972 mg/L. Furthermore, the cumulative methane production, specific methane yield and average methane concentration are the worst profile in these experiments. These performances conform to literatures pointed that pH ≧8 induce the ammonia concentration will be relatively increased, further, inhibited the methane production. |
