为改善泥炭生物转化甲烷产率低的现状，探索腐植酸降解产物苯甲醛对泥炭生物甲烷化的影响。以草本泥炭为原料，从其主要成分化学腐植酸的降解产物出发，在泥炭生物甲烷发酵体系中添加不同浓度苯甲醛，解析苯甲醛对日产气量、总产气量、辅酶F₄₂₀、COD、碱度和苯甲醛浓度的影响。结果表明，在50℃发酵温度下厌氧发酵30 d，对照组总产气量为381.8 mL，添加28.27 mmol/L苯甲醛泥炭发酵组总产气量达805.9 mL，与对照组相比增加了111.09%；日产气量最高达到162.8 mL，比同期对照组高152 mL；COD去除率达46.5%，比对照组提高了28.3%。添加腐植酸降解产物苯甲醛有利于促进泥炭甲烷发酵体系有机物降解，促进泥炭生物甲烷转化。

In order to solve the issue of low methane yield from bio-conversion of peat,the effect of benzaldehyde,which is a product from humic acid degradation,on bio-methanation of peat is explored.Starting from the degradation products of humic acid that is the main chemical components of peat,different concentrations of benzaldehyde are added into the peat bio-methanation fermentation system with meadow peat as raw materials.The effects of benzaldehyde on daily gas production,total gas production,coenzyme F₄₂₀,chemical oxygen demand (COD),alkalinity and benzaldehyde concentration are analyzed.Results show that after anaerobic fermentation has carried out for 30 days at 50℃,the total methane production of blank group is 381.8 mL,while that of the group added with 28.27 mmol·L^-1 of benzaldehyde reaches 805.9 mL,representing an increase of 111.09%.Daily methane production of the group added with 28.27 mmol·L^-1 of benzaldehyde peaks at 162.8 mL on the 14th day,which is 152 mL higher than the blank group in the same period.COD removal rate reaches 46.5%,an increase of 28.3% than that of the blank group.It proves that the addition of benzaldehyde,the product from humic acid degradation,can promote the degradation of organic matters,which is beneficial to the bio-methanation of peat.

郝思雯(1993-),女,硕士研究生,研究方向为生物质和低阶煤炭转化,5120140147@bipt.edu.cn