【摘要】 该研究利用人工搅拌大幅提高接种液的激活速度,从而加快沼气工程的启动过程,提高工程效率。采用平行实验方法,以3台653.5 L的厌氧发酵实验罐进行了投放接种物的启动实验,实验罐1#和4#分别采用底部进水高位集中压力出水(单口)和底部进水高位分散式压力出水(4口)的循环流化水力搅拌方案。42 d连续发酵显示,1#和4#分别比不搅拌的对照组0#罐早1 d和7 d启动,产气率分别提升89%和125%,COD去除率分别提升27%和42%。实验验证了水力搅拌在发酵启动阶段的加速作用,以及优化搅拌的进一步提升作用。更多还原

【Abstract】 In this study, artificial agitation was used to increase the activation speed of inoculums, thus accelerating the start-up of biogas project and improving the engineering efficiency. By using parallel experiment method, inoculum fluid(the end effluent of a normal operating biogas plant) was added into three anaerobic fermentation tanks of 653.5 L for starting-up.The experimental tanks 1# adopted water inlet at the bottom with concentrated pressure outlet(single outlet) on the high position of the tank as a hydraulic agitation, and tank 4# also adopted water inlet at the bottom but dispersed pressure outlet(4 outlet) on high-position of the tank as a hydraulic agitating. 42 days of continuous fermentation showed that 1# was started up 1 day earlier than the control group 0#, the biogas production increased by 89%, and the COD removal rate increased by 27%. Group 4# was started up 7 days earlier than the control, the biogas production increased by 125%, and the COD removal rate increased by 42%. The experimental results verified the acceleration effect of hydraulic agitation in the starting stage of fermentation and the further enhancement effect of optimized agitation.更多还原