生活垃圾协同水葫芦干式厌氧发酵制沼气的研究

Dry Anaerobic Co-digestion of Water Hyacinth and Municipal Solid Waste

探讨了水葫芦和生活垃圾在中温条件下联合发酵的可行性,研究了系统总固体含量(TS)、发酵母液添加比例(IR)以及水葫芦添加比例(WR)对厌氧发酵过程的影响。试验结果表明,添加5%的水葫芦能够有效防止因TS和IR的变化对系统pH值所带来的影响,缩短发酵启动时间,使产气高峰集中出现,并提高产气量。但是当水葫芦添加比例增加到10%时,沼气产量反而下降。发酵70 d后,挥发性固体(VS)降解率为38.18%～58.10%。通过对正交试验结果进行分析,得到水葫芦与生活垃圾联合发酵制沼气的较优工艺条件为:系统总固体含量23%,发酵母液添加比例100%,水葫芦添加比例5%。

Feasibility of anaerobic co-digestion of water hyacinth and municipal solid waste （MSW） under mesophilic conditions was investigated. Effects of total solid （TS）, inoculum ratio （IR） and water hyacinth ratio （WR） on anaerobic digestion process were studied. Results showed that adding 5% water hyacinth to MSW anaerobic digestion system could effectively prevent the impact on the system pH value caused by variations of TS and IR, shorten the lag phase, centralize the biogas yield peak and enhance biogas production. But the biogas production decreased when WR increased to i0%. Volatile solid （VS） degradation rates of all experiments were between 38.18% and 58.10% after 70d anaerobic digestion. Orthogonal experiment results indicated that the optimum process conditions were TS 23%, IR 100% and WR 5% for the anaerobic co-digestion of water hyacinth and MSW.