以马铃薯渣为原料的沼气发酵体系的建立

Construction of biogas fermentation system using potato residues as single feedstoc

单纯以马铃薯渣为原料进行沼气发酵很难成功，本研究建立稳定的以马铃薯渣为原料的沼气发酵体系，研究该体系的产气规律，达到充分利用马铃薯渣、，提高产气效率的目的，为采用马铃薯渣厌氧发酵产生沼气提供技术支持。在发酵容积为20L的牛粪沼气发酵体系的基础上，通过用马铃薯渣逐步替换牛粪的方式，以7d为一个驯化周期，驯化原有沼气发酵体系。驯化到第6代以后，沼气发酵体系逐渐稳定。在驯化过程中，pH从原来的7．5～7．7变化至稳定后的6．4～6．9；产气高峰期逐渐提前，至第6代后产气高峰期为添加薯渣后1d。发酵体系稳定后，各代平均日产气量为10.39L，平均最高日产气量为10．55L，最高日产气体积比达到1．261；COD去除率维持在50％～55％；稳定后木质纤维素分解率为18．9％。

The potato residues was a good kind of material for biogas production, but the fermentation system of biogas was hardly constructed when single potato residues was used as only feedstock. In this paper, in order to construct a stable biogas generation system using potato residues as single material, cattle manure was substituted for potato residues as the single feedstock on the basis of stable cattle manure fermentation system of 20 L anaerobic fermenter until the proportion of potato residues to be the maximum, and a cycle was 7 days during the process of acclimatization. The biogas generation trend of fermentation system was stable from the 6th cycle. During the process of acclimatization, pH value was turned from 7.5-7.7 to 6.4-6.9, and pH was held on 6.4-6.9 after the system was stable. The peak of biogas production gradually moved forward and it appeared only one day after adding potato residues after the 6th cycle. When the fermentation system kept stable, the average daily volume of each generation was 10.39 L, and the highest gas production volume and ratewere 10.55 L and 1.261, respectively. COD removal rate of each cycle was 50-55%, and the degrada- tion rate of lignocellulose was 18.9% after the system was stable.