Study on Rapid Start-up Characteristics of Anaerobic Digestion of Kitchen Waste
In order to clarify the anaerobic digestion characteristics of solid phase material in the rapid start-up process of kitchen waste,a Semi-Continuous Stirring Tank Reactor system was used.The changes in biogas production and methane content,pH value of biogas slurry,volatile fatty acids(VFA),alkalinity and ammonia nitrogen during the operation of Or-ganic Loading Rate(OLR)at 1.5、2.0、2.5 and 3.0 gVS·L-1d-1were monitored.The results show that,When OLR in-creased from 1.5 gVS·L-1d-1to 3.0 gVS·L-1d-1,the volumetric biogas production rate increased 2.12±0.05 L·L-1d-1,and the specific methane production remained stable at 273.2±7.8 mLCH4·g-1 VS.The gas production performance of the system is good and stable.The volatile fatty acids concentration remained low(about 650 mg·L-1),and the main compo-nent was acetic acid.With the increase of OLR,the ammonia nitrogen content increased to 4171 mg·L-1,and the free am-monia increased to 300～350 mg·L-1,which slightly inhibited the gas production performance.The microbial community analysis showed that the main bacteria groups were Firmicutes,Bacteroidota and Synergistota.The dominant methanogenic bacteria groups were mainly Methanosarcina,Methanobacterium and Methanosaeta.The start-up phase of anaerobic diges-tion can run stably when the OLR reaches 3.0 g VS·L-1d-1,and the reactor is successfully started.
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