Effect of Methanogenesis of Residue from Thermal Pre-treatment Sludge by Anaerobic Fermentative Hydrogen Production☆

Abstract The municipal sludge of Wastewater treatment plants generate a mass of municipal sludge is becoming an extremely environment issue. Effective utilization of the sludge to generate benefits concern many scholars. This research worked systematically to study the condition of gas production of sludge by thermal pre-treatment and compared a large differance among the maximum cumulative methane production in the sludge of high temperature thermal treatment. The inoculum via 75 °C thermal pretreatment for 10 min mixed sludge substrates by different temperature pre-treatment for 30 min. The optimum methane production was obtained from 160 °C, and the 120 °C was worse in the methane produciton. The max accumulated hydrogen and methane production were 3.57 mL and 235.97 mL respectively of 160 °C; the max accumulated methane production was 193.24 mL of 120 °C. Compared the metabolic process of anaerobic fermentation of methane, the degradation of organic matter in the sludge substrate by 160 °C for heat treatment was better than that of 120 °C.