Effect of thermal hydrolysis pretreatment on mesophilic anaerobic digestion of excess sludge
GUO Si-yu, PENG Yong-zhen, LI Xi-yao, HE Yue-lan, GAO Yao-yuan, LI Lu-kai
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing 100124, China
The waste activated sludge produced by the treatment of actual domestic sewage was subjected to thermal pretreatment at different time (0~100min) at 70℃, and the effects of different pretreatment time and different solid residence times (20d and 30d) were studied by batch test on the anaerobic digestion of waste activated sludge at 35℃. The results showed that after anaerobic digestion, the average removal rate of total chemical oxygen demand was 55.76% under the conditions that SRT was 20d and pretreatment time was 100min.when the pretreatment time was 100min,the average capillary suction time decreased by 26%(20d) and 37%(30d) comparing with the control group. And the average yield of methane was 10.83mL/d under the condition that SRT was 20d and pretreatment time was 60min. Economic analysis showed that the anaerobic digestion of waste activated sludge can reduce the cost of 50.9~499.5yuan/ton dry sludge after 70℃ pretreatment. Therefore, the best SRT was 20d and the best pretreatment time was 60min for the thermal pretreatment.
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