Start-up strategy for hyperthermophilic anaerobic digestion system of sewage sludge
DAI Xiao-hu, YU Chun-xiao, LI Ning, DONG Bin
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 20092, China
The feasibility of hyperthermophilic anaerobic digestion system of sewage sludge is evaluated in the study,which is conducted with biochemical methane potential experiments using thermophilic anaerobic digestate as inoculum and cow dung and dewatered sludge as substrate.The results show that:①the start-up of hyperthermophilic sludge anaerobic digestion system is practicable;②the accumulation of VFAs (particularly propionic acid) is easy to occur due to the acceleration of hydrolysis and acidification process under 65℃;③compared with mesophilic (37℃) and thermophilic (55℃) anaerobic digestion systems,the total gas production of hyperthermophilic (65℃) system is relatively lower,while the methane content is elevated significantly,even reaching 79.0%;④under hyperthermophilic (65℃) condition,the extremely thermophilic bacteria responsible for lignocellulose and protein degradation such as Coprothermobacter、Caldicoprobacter、Ruminiclostridiumwere dominant,the difference of which is due to the different substrate addition;hydrogenotrophic methanogens-Methanothermobacter accounted for nearly 96% of archaea in all the digesters.Thus,in the start-up period,the addition of cow dung can not only accelerate the accumulation of hyperthermophilic methanogens (Hydrogenotrophic methanogens),but also avoid the accumulation of VFAs,particularly the accumulation of propionic acids,ensuring successful start-up of the system.
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