一体化两相厌氧反应器处理猪场废水的启动研究

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37 ℃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8.84 kg/(m3·d),HRT为20.95 h,产酸相的COD去除率基本维持在20.00%～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31.11 kg/(m3·d) 和5.95 h,产甲烷相的VLR和HRT分别为9.39 kg/(m3·d)和15.00 h.出水悬浮固体(SS)含量均在400 mg/L以下,去除率最高可达92.80%,沼气的容积产气率达到2.57 m3/(m3·d).

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

An integrated two-phase anaerobic reactor was designed to treat piggery wastewater, and the correspon- ding 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%～30.00% in the acidogenic phase and a COD removal of more than 80.00% in the whole system are respectively achieved at a VLR of 8.84 kg/(m~3·d) and a HRT of 20.95 h; (2) the acidogenic phase is operated up to a VLR of 31.11 kg/(m~3·d) with a HRT of 5.95 h whereas the methanogenic phase is loaded up to a VLR of 9.39 kg/(m~3·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 production rate of biogas reaches 2.57 m~3/(m~3·d).