牛粪与秸秆中温干式厌氧共发酵处理性能的研究OA

In order to study the dry anaerobic co-fermentation performance of cow dung and wheat straw mixture,and a hori-zontal thrust flow reactor was used to carry out a continuous operation test for 109 d under medium temperature conditions of cow dung and wheat straw mixture with a mass ratio of 4～6∶1as raw material.The system investigated the dynamic changes of gas production performance,substrate degradation efficiency and key operating parameters through the gradient lifting strategy of acclimatization stage,low load 2.7±0.2 kgVS·m-3d-1 cumulative operation period and high load 4.5±0.3 kgVS·m-3d-1 stable operation period.The results show that the system has good load adaptability and operational stability:the VS gas production reaches 331±27 m3·t-1 under high load,and the VS removal rate is stable at 48％～60％.The methane content in biogas was maintained at 57.0％±3.0％.The pH value of the system was stable at 7.3～7.8,and the ratio of volatile fatty acids/total inorganic carbon alkalinity(FOS/TAC)was always lower than 0.45,indicating that it had a strong acid-base buffer ability.Although the total ammonia nitrogen(TAN)concentration accumulated to 2200～2400 mg·L-1,it did not significantly inhibit the methanogenesis process,and it together with the system alkalinity constituted a stable internal environment.