Abstract
Dairy manure (DM) contains high contents of lignocellulosic materials that are difficult to be converted into methane via anaerobic digestion (AD). KMnO4 pretreatment and then semi-dry batch AD tests of DM were conducted at total solids (TS) of 13–15% and 37 ± 2 °C for 35 days. Remarkable improvement on DM degradation was noticed after KMnO4 pretreatment for 8 h, achieving the maximum cellulose and lignin reductions about 49% and 48% respectively at KMnO4 dosage of 100 mg/g-TS. The maximum volatile solids (VS) based daily methane production of 12.38 NL/kg-VS/d and volumetric methane production rate of 0.95 L/L/d were obtained from the semi-dry AD, increasing by 27% and 23% respectively when compared to the control. Firmicutes, Bacteroidetes and Methanosarcina were found to dominate the early stage of semi-dry AD process. In summary, KMnO4 pretreatment can significantly enhance the decomposition of lignocellulose and then methane production from semi-dry AD of DM.
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