Improvement of anaerobic co-digestion of plant waste and excess sludge using calcium peroxide

Plant waste (PW) and excess sludge (ES) are two main organic matters of municipal solid waste. However, there few reports on their anaerobic co-digestion. In this work, the mixed proportion PW ES co-digestion was first optimized at mesophilic temperature, then enhanced with strong oxidant calcium peroxide (CP). The results showed that optimal mixing ratio 1/1 (in terms volatile solids), C/N digestion substrate 23.5/1, maximum methane production 172.6 mL/g solids). CP could enhance from ES. When content 0.2 g/g total suspended 234.8 mL/g, about 1.4 times blank. mechanism investigation promoted release matter during co-digestion, higher CP, greater soluble chemical oxygen demand. presence appropriate amount activities key enzymes in fermentation process, increased efficiency production. work provide an alternative strategy for resource utilization