低温热解油厌氧消化产甲烷条件研究

The research on anaerobic digestion conditions of biomethanation using low-temperature pyrolysis oil

对低温热解油的厌氧消化条件进行研究,包括新鲜接种污泥的驯化,热解油厌氧消化条件的影响因素和生物质热解参数对最终厌氧消化的影响.通过控制不同热解参数及厌氧发酵参数的方法对耦合过程进行研究.结果表明,新鲜接种污泥经过驯化可以显著提升其对热解油中抑制物的耐受性,进而大幅提升热解油厌氧消化的甲烷产量.中温的培养条件更适合浓度为4%的热解油厌氧消化甲烷化,而高温的培养条件更适合浓度为10%的高浓度热解油.此外,0.85mm生物质粒径、300℃热解温度在下游的消化阶段有更高的甲烷产量.

This article focused on the research of anaerobic digestion conditions using low-temperature pyrolysis oil,including the fresh inoculum acclimatization,the operation conditions of pyrolysis oil(PO)digestion and the influence of biomass pyrolysis parameters.The coupling process was studied by controlling different pyrolysis parameters and anaerobic digestion parameters.It can be concluded that the fresh sludge inoculum acclimatization can significantly improve the tolerance to the inhibitors contained in the PO,thus,the methane production from the PO digestion to a great degree.The mesophilic condition was favorable to the biooil biomethanation for the low POs under 4%as used in the experiment,whereas the thermophilic condition was favorable for the high PO concentration of 10%.Besides,more methane production can be given by 0.85 mm biomass particle size,300℃pyrolysis temperature in the downstream step of PO digestion.