The effects of mesophilic anaerobic co-digestion (AcoD) of organic fraction of municipal solid waste (OFMSW) and sewage sludge (SS) on enhancement of biogas production were investigated under different types of sludge combinations (primary sludge PS, waste-activated sludge WAS and mixed sludge MS), varying mixing ratios of OFMSW and MS (50:50, 70:30, 80:20, 90:10, v/v) and varying total solid TS concentrations (6, 9, 12, 15%). The co-digestion of OFMSW with MS resulted in the biogas yield of 138 mL/gVS over mono-digestion of OFMSW (39 mL/gVS). Co-digestion of OFMSW + PS and OFMSW + WAS yielded biogas of 107 and 129 mL/gVS, respectively, which is less than that of OFMSW + MS (138 mL/gVS), respectively. The co-digestion of OFMSW with MS showed a 2.5 times increase in biogas yield over OFMSW digestion alone and 23% and 7% higher biogas yield than OFMSW + PS and OFMSW + WAS, respectively. The highest biogas yield of 967 mL/g VS was observed at TS concentration of 9% and OFMSW to the MS mixing ratio of 80:20, respectively. The biogas yields at different TS percentages were modelled using Gompertz and Logistic models and fitted well.

Graphical abstract

在不同类型的污泥组合（主要污泥PS，废物活化污泥WAS）下，研究了城市固体废物有机组分（OFMSW）和污水污泥（SS）的中温厌氧共消化（AcoD）对提高沼气产量的影响。和混合污泥MS），不同的OFMSW和MS混合比例（50：50、70：30、80：20、90：10，v / v）和变化的总固体TS浓度（6、9、12、15％） 。OFMSW与MS的共消化比单消化OFMSW（39 mL / gVS）产生的沼气产量为138 mL / gVS。OFMSW + PS和OFMSW + WAS的共同消化产生的沼气分别为107和129 mL / gVS，分别低于OFMSW + MS（138 mL / gVS）。OFMSW与MS的共同消化显示为2。沼气产量比单独的OFMSW消化高5倍，分别比OFMSW + PS和OFMSW + WAS高23％和7％。在9％的TS浓度和80:20的MS混合比下，观察到最高沼气产量为967 mL / gVS。使用Gompertz和Logistic模型对不同TS百分比的沼气产量进行了建模，并拟合得很好。

图形概要