水葫芦固液分离后残渣连续干发酵的研究

Study on continuous dry-fermentation of separated solid of Eichhornia crassipes for biogas

以水葫芦为原料进行固液分离,在室温条件下,采用批量连续发酵工艺对水葫芦残渣进行发酵产沼气的试验,试验发酵HRT(水力滞留时间)为30 d。采用500 ml发酵装置30套,每天投料100 g,试验共进行90 d。试验结果表明,经过1个周期(30 d)的运行后,发酵液日产气量较稳定,TS产气率为181 L/kg,VS产气率为237L/kg,甲烷体积分数达55%～59%。发酵后的有机物可以制成有机肥料,便于运输。连续发酵工艺克服了单相发酵过程中因水葫芦含水量高,造成体积膨大、池容产气率低、发酵周期长、出料不便、易结壳、沼渣综合利用困难等问题,也克服了两相消化过程中的酸化阶段消耗大量的水等问题。

With E.erassipe as feedstock for solid-liquid separation, under ambient temperature, the anaerobic fermentation experiment has been carried out with the residues of E.crassipes as feedstock by continuous batch fermentation, the HRT of the fermentation in the experiment is 30 days. The 30 sets of fermentation equipment of 500 ml volume was fed by 100 g/d of feedstock, the experiment dura- tion was 90 days. The result showed the biogas yield was stable in 30 days and its average was 3.06 L/d, the highest yield of biogas was 181 IAg or 237 L/kg with methane content of 55%-59%, The organic fertilizer was made after fermentation. The continuous fermentation technology could overcome the problems of one-phase anaerobic digestion, which are, big volume requied, lower volmne gas yield, long fermentation period, difficult for residue discharge, easy to agglomerate and the problems for comprehensive utilization of the fermentation residues, moreover, the technology also will also solve the problem of large amount water need in the two phase digestion.