Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan.
Laboratory of Marine Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Bioresour Technol. 2014 Apr;157:174-80. doi: 10.1016/j.biortech.2014.01.018. Epub 2014 Jan 30.
Influence of the labile organic fraction (LOF) on anaerobic digestion of food waste was investigated in different S/I ratio of 0.33, 0.5, 1.0, 2.0 and 4.0g-VSsubstrate/g-VSinoculum. Two types of substrate, standard food waste (Substrate 1) and standard food waste with the supernatant (containing LOF) removed (Substrate 2) were used. Highest methane yield of 435ml-CH4g-VS(-1) in Substrate 1 was observed in the lowest S/I ratio, while the methane yield of the other S/I ratios were 38-73% lower than the highest yield due to acidification. The methane yields in Substrate 2 were relatively stable in all S/I conditions, although the maximum methane yield was low compared with Substrate 1. These results showed that LOF in food waste causes acidification, but also contributes to high methane yields, suggesting that low S/I ratio (<0.33) is required to obtain a reliable methane yield from food waste compared to other organic substrates.
考察了不同固液比（S/I）（0.33、0.5、1.0、2.0 和 4.0 g-VS 底物/g-VS 接种物）下不稳定有机质（LOF）对食物垃圾厌氧消化的影响。使用了两种类型的底物，标准食物垃圾（底物 1）和去除上清液（含有 LOF）的标准食物垃圾（底物 2）。在最低 S/I 比下，观察到底物 1 的最大甲烷产量为 435ml-CH4g-VS(-1)，而其他 S/I 比的甲烷产量由于酸化而比最高产量低 38-73%。在所有 S/I 条件下，底物 2 的甲烷产量相对稳定，尽管与底物 1 相比，最大甲烷产量较低。这些结果表明，食物垃圾中的 LOF 会导致酸化，但也有助于产生高甲烷产量，这表明与其他有机底物相比，从食物垃圾中获得可靠的甲烷产量需要较低的 S/I 比（<0.33）。
