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通过一款自行设计的两相厌氧发酵装置,以半连续进料的方式对蔬菜垃圾产沼气情况进行研究。结果表明:在酸化相阶段,温度的升高有利于产酸反应的进行,35℃下,总挥发酸(乙酸、丙酸、异丁酸、丁酸)在酸化时间第3天时获得最大产量6892 mg/L,其中乙酸含量为4589 mg/L,达到66.58%,主要为乙酸型发酵,p H值在酸化开始后不断下降至3.42,于第9天逐渐回升并保持在7.0以下。氧化还原电位(ORP)随酸化时间的延长总体趋势逐渐降低。35℃的产酸效果和停留时间均优于25℃时。甲烷相的最佳有机负荷率为3.0~3.5 kg VS/(m3·d),平均SCOD去除能力在92%以上,平均沼气产量为0.59 m3/kg VS,甲烷产量为0.36 m3/kg VS,日容积产气率最高为2.6 m3/(m3·d)。
Through a self-designed two-phase anaerobic fermentation device, the biogas production of vegetable wastes was studied in the way of semi-continuous feeding. The results showed that during the acidification phase, the increase of temperature was favorable for the acidogenic reaction. At 35 ℃, the maximum yield of total volatile acids (acetic acid, propionic acid, isobutyric acid and butyric acid) mg / L, acetic acid content was 4589 mg / L, which reached 66.58%, which was mainly acetic acid type fermentation. The p H value decreased continuously to 3.42 after the acidification started, and gradually rose to below 7.0 on the 9th day. ORP decreased gradually with the prolongation of acidification time. The acidogenic effect and residence time at 35 ℃ were better than 25 ℃. The best organic loading rate of methane phase was 3.0-3.5 kg VS / (m3 · d), average SCOD removal capacity was over 92%, average biogas production was 0.59 m3 / kg VS, methane production was 0.36 m3 / kg VS, Volume gas yield up to 2.6 m3 / (m3 · d).