Department of Environmental Science and Engineering, Beijing University of Chemical Technology, People's Republic of China.
Appl Biochem Biotechnol. 2010 Jan;160(2):643-54. doi: 10.1007/s12010-009-8533-z. Epub 2009 Feb 12.
Co-digestion of food waste and dairy manure in a two-phase digestion system was conducted in laboratory scale. Four influents of R0, R1, R2, and R3 were tested, which were made by mixing food waste with dairy manure at different ratios of 0:1, 1:1, 3:1, and 6:1, respectively. For each influent, three runs of experiments were performed with the same overall hydraulic retention time (HRT) of 13 days but different HRT for acidification (1, 2, and 3 days) and methanogenesis (12, 11, and 10 days) in two-phase digesters. The results showed that the gas production rate (GPR) of co-digestion of food waste with dairy manure was enhanced by 0.8-5.5 times as compared to the digestion with dairy manure alone. Appropriate HRT for acidification was mainly determined by the biodegradability of the substrate digested. Three-, 2-, and 1-day HRT for acidification were found to be optimal for the digestion of R0, R1, and R2/R3, respectively, when overall HRT of 13 days was used. The highest GPR of 3.97 L/L.day was achieved for R3(6:1) in Run 1 (1 + 12 days), therefore, the mixing ratio of 6:1 and HRT of 1 day for acidification were considered to be the optimal ones and thus recommended for co-digestion of food waste and dairy manure. There were close correlations between degradation of organic matters and GPR. The highest VS removal rate was achieved at the same HRT for acidification and mixing ratio of food waste and dairy manure as GPR in the co-digestion. The two-phase digestion system showed good stability, which was mainly attributed to the strong buffering capacity with two-phase system and the high alkalinity from dairy manure when co-digested with food waste.
在实验室规模下进行了两相消化系统中厨余垃圾和奶牛粪便的共消化。测试了 R0、R1、R2 和 R3 四种进料，它们是通过将厨余垃圾与奶牛粪便以 0:1、1:1、3:1 和 6:1 的不同比例混合而成。对于每种进料，在两相消化器中以相同的总水力停留时间（HRT）13 天但酸化（1、2 和 3 天）和产甲烷（12、11 和 10 天）的不同 HRT 进行了三次实验运行。结果表明，与单独消化奶牛粪便相比，厨余垃圾与奶牛粪便共消化的产气量（GPR）提高了 0.8-5.5 倍。适当的酸化 HRT 主要取决于被消化底物的生物降解性。当使用 13 天的总 HRT 时，发现 3、2 和 1 天的酸化 HRT 分别是 R0、R1 和 R2/R3 消化的最佳酸化 HRT。在运行 1（1 + 12 天）中，R3(6:1) 达到了 3.97 L/L.day 的最高 GPR，因此，混合比例为 6:1 和酸化 HRT 为 1 天被认为是最佳的，因此推荐用于厨余垃圾和奶牛粪便的共消化。有机物的降解与 GPR 密切相关。在相同的酸化 HRT 和厨余垃圾与奶牛粪便的混合比例下，达到了最高的 VS 去除率，这与共消化中的 GPR 相同。两相消化系统表现出良好的稳定性，这主要归因于两相系统的强缓冲能力和与厨余垃圾共消化时奶牛粪便的高碱度。
