厌氧发酵停滞后主动曝气效果研究

摘要

This study found that the digestion system generally stagnated in two stages, the post-hydrolysis acidification stage and the post-peak-production of methane. Active aeration in two stagnant periods can restart anaerobic digestion to produce biogas. And active aeration increases the biogas production and the degradation rate of the digestion substrate, simultaneously. The active aeration effects of two stages were discussed, respectively. The results showed that in the post-hydrolysis acidification stage, biogas production could be raised 3066-3826ml, increased by 187 %~272 %; during the stage of post-peak-production, biogas production raised 879~1080 mL, increased by 13 %~16 %, instead. If the effect of biogas production before aeration is good, the increase of gas production after is not significant. If the effect of biogas production before active aeration is poor, and the increment of biogas production after accounts for 65 %~73 % of the cumulative biogas production.%本研究发现发酵体系一般停滞在两个阶段,水解酸化阶段和产甲烷高峰结束之后.对两个停滞期进行主动曝气,可以再次启动厌氧发酵产甲烷,同时提高产气量和发酵基质的降解率.分别讨论了水解酸化阶段主动曝气的效果和产甲烷高峰期后主动曝气的效果.结果表明:对水解酸化阶段停滞期进行主动曝气产气量增加了3066~3826 mL,提高了187 %~272 %;对产甲烷高峰期后停滞期进行主动曝气,产气量增加了879~1080 mL,提高了13 %~16 %.发酵停滞前产气效果好的,主动曝气后产气量增幅不显著,发酵停滞前产气效果差的,主动曝气后产气的增量占累积产气量的65 %~73 %.