State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
J Environ Sci (China). 2011;23(8):1403-8. doi: 10.1016/s1001-0742(10)60572-4.
The biochemical methane potentials for typical fruit and vegetable waste (FVW) and food waste (FW) from a northern China city were investigated, which were 0.30, 0.56 m3 CH4/kgVS (volatile solids) with biodegradabilities of 59.3% and 83.6%, respectively. Individual anaerobic digestion testes of FVW and FW we re conducted at the organic loading rate (OLR) of 3 k g VS/(m3.day) using a lab-scale continuous stirred-tank reactor at 350C. FVW could b e digested stably with the biogas production rate of 2.17 m3/(m3 .day)and methane production yield of 0.42 m3 CH4/kg VS. However, anaerobic digestion process for FW was failed due to acids accumulation. The effects of FVW: FW ratio on co-digestion stability and performance were further investigated at the same OLR. At FVW and FW mixing ratios of 2:1 and 1:1, the performance and operation of the digester were maintained stable, with no accumulation of volatile fatty acids (VFA) and ammonia. Changing the feed to a higher FW content in a ratio of FVW to FW 1:2, resulted in an increase inVFAs concentration to 1100-1200 mg/L, and the methanogenesis was slightly inhibited. At the optimum mixture ratio 1:1 for co-digestion of FVW with FW, the methane production yield was 0.49 m3 CH4/kg VS, and the volatile solids and soluble chemical oxygen demand (sCOD) removal efficiencies were 74.9% and 96.1%, respectively.
研究了中国北方某城市典型果蔬废物（FVW）和食物废物（FW）的生物化学甲烷潜能，其生物降解率分别为 59.3%和 83.6%，甲烷潜能分别为 0.30 和 0.56m3 CH4/kgVS。在 35℃下，采用实验室规模连续搅拌罐反应器，在 3kg VS/（m3·天）的有机负荷率（OLR）下，对 FVW 和 FW 进行了单独的厌氧消化试验。FVW 可以稳定消化，沼气产率为 2.17m3/（m3·天），甲烷产率为 0.42m3 CH4/kgVS。然而，FW 的厌氧消化过程由于酸积累而失败。在相同的 OLR 下，进一步研究了 FVW：FW 比对共消化稳定性和性能的影响。在 FVW 和 FW 的混合比为 2:1 和 1:1 时，消化器的性能和运行保持稳定，挥发性脂肪酸（VFA）和氨没有积累。将进料改为较高的 FW 含量，FW 与 FVW 的比例为 1:2，导致 VFA 浓度增加到 1100-1200mg/L，甲烷生成略有抑制。在 FVW 与 FW 共消化的最佳混合比 1:1 下，甲烷产率为 0.49m3 CH4/kgVS，挥发性固体和可溶解性化学需氧量（sCOD）去除率分别为 74.9%和 96.1%。
