接种量对餐厨垃圾高温厌氧消化的影响

Influence of inoculum on thermophilic anaerobic digestion of food waste

研究不同接种量对餐厨垃圾高温厌氧消化的影响,探求餐厨垃圾高温厌氧消化的最佳接种量。在55℃条件下,比较6种不同接种量对餐厨垃圾高温厌氧消化过程中pH、总磷浓度、VFA浓度、产气量及餐厨垃圾TS、VS去除效果和消化液CODCr去除效果的影响,结果表明:添加接种物不仅可以提高消化系统的缓冲能力,而且缩短系统产甲烷细菌的积累周期,有利于产气高峰提前,同时对餐厨垃圾的降解有一定的促进作用。其中,在消化物总量600g条件下,480g餐厨垃圾接种120g接种物(TS比为9.47)产气效果最佳,整个过程累积产气量为9359mL,显著高于其它处理,此外,餐厨垃圾TS、VS去除率和消化液CODCr去除率也达到最佳效果,去除率依次为60%、70%和39.67%,但是CODCr去除率与CK差异不显著。

The effects of different inoculum proportion on the thermophilic anaerobic digestion of food waste were studied.The best inoculum proportion was investigated.The effects of six different inoculum proportions on pH,TP concentration,VFA concentration,biogas production and the reduction effects of TS,VS and CODCr were explored at 55℃.The results showed that the buffer capacity of digestion system was enhanced by adding inoculums.The accumulation cycle of methanogenic bacteria was shortened and the aerogenical fastigium came earlier than before.Moreover,the reduction effect of food waste was promoted.Under the condition of the same materials of 600 grams,the biogas production of the treatment with 480 grams food waste inoculated with 120 grams inoculums（TS ratio 9.47 of food waste and inoculum）was 9359 mL which was larger than that of any other treatment significantly.The reduction effects of TS,VS and CODCr were also the best,and the reduction rate was 60%,70%and 39.67%,respectively.However,there was no significant difference in CODCr reduction compared with CK which was not inoculated.