一体化两相厌氧反应器处理猪场废水的启动研究

Investigation into Start-Up of Integrated Two-Phase Anaerobic Reactor Treating Piggery Wastewater

采用自行设计的一体化两相厌氧反应器处理猪场废水，对启动过程进行研究．在37G℃下，通过交替增加进水化学需氧量（COD）浓度和缩短水力停留时间（HRT）来提高系统的COD容积负荷（VLR），采用动力学控制与pH值调节相结合的方法对产酸相和产甲烷相进行分相．经过68天的运行，系统的VLR达到8．84kg／（m3·d），HRT为20．95h，产酸相的COD去除率基本维持在20．OO％～30．00％，系统的COD去除率稳定在80．00％以上．其中产酸相的VLR和HRT分别为31．11kg／（m3·d）和5．95h，产甲烷相的VLR和HRT分别为9．39kg／（m3·d）和15．00h．出水悬浮固体（SS）含量均在400mg／L以下，去除率最高可达92．80％，沼气的容积产气率达到2．57m3／（m3·d）．

An integrated two-phase anaerobic reactor was designed to treat piggery wastewater, and the corresponding start-up process was investigated. In this investigation, the volumetric loading rate （VLR） of the system was raised by alternately increasing the influent COD （ Chemical Oxygen Demand） concentration and decreasing the hydraulic retention time （HRT） at 37℃. Moreover, acidogenic and methanogenic phases were separated by controlling the VLR in combination with adjusting the pH value of the influent. The results show that （ 1 ） after a 68-day operation, a COD removal of 20. 00% - 301 00% in the acidogenic phase and a COD removal of more than 80. 00% in the whole system are respectively achieved at a VLR of 8.84kg/（m3· d） and a HRT of 20.95h; （2） the acidogenic phase is operated up to a VLR of 31.11 kg/（ m3·d） with a HRT of 5.95 h whereas the methanogenic phase is loaded up to a VLR of 9.39 kg/（ m3 ·d） with a HRT of 15 h ; （ 3 ） the suspended solid （SS） in the effluent is of a content of less than 400 mg/L and a highest removal up to 92.80% ; and （4） the volumetric produc- tion rate of biogas reaches 2. 57m3/（ m3· d）.