Four kinds of biochar were obtained by pyrolysis carbonization and hydrothermal carbonization from swine manure digestate, i.e. pyrochar (HC, HC-Fe) and hydrochar (HTC, HTC-Fe). Batch fermentation was conducted to compare their effects on the co-digestion of sewage sludge and swine manure. Both pyrochar and hydrochar present positive effect on methane production, nevertheless the higher methane yields were obtained in HTC and HTC-Fe digesters. No advantage was observed for the iron impregnation. The maximum methane yield was 308.4 mL/g VS in HTC digester, which was 27% and 49% higher than HC and Control, respectively. The surface functional groups of hydrochar are more abundant than pyrochar, which is favorable for promoting the syntrophic anaerobic metabolism, as revealed by the promoted substrate hydrolysis and VFAs consumption rate. Thus, it is proposed to convert swine manure digestate to hydrochar, which can be recirculated back to the AD reactor to increase the digestion efficiency.

通过猪粪消化液的热解碳化和水热碳化得到了四种生物炭，即焦炭（HC，HC-Fe）和水炭（HTC，HTC-Fe）。进行分批发酵以比较它们对污水污泥和猪粪共同消化的影响。焦炭和水焦炭均对甲烷的产生产生积极影响，尽管如此，在HTC和HTC-Fe消化池中甲烷的产率更高。没有观察到铁浸渍的优点。在HTC蒸煮器中，最大甲烷产量为308.4 mL / g VS，分别比HC和Control高27％和49％。水焦炭的表面官能团比焦炭更丰富，这通过促进底物水解和VFA消耗速率显示，有利于促进营养性厌氧代谢。从而，