两相厌氧工艺好氧预挂膜快速启动试验研究

Rapid start-up of two-phase anaerobic process after aerobic precoating treatment

为克服两相厌氧反应器启动时间长的缺点，采用填料好氧预挂膜（10h）的方法来加快两相厌氧反应器的启动速度，小试试验结果表明：以高浓度难降解中药废水为底物、好氧污泥为种泥，13d就完成快速启动．这个启动速度比接种普通污泥快4～6倍（8-12周），与接种成熟厌氧颗粒污泥持平（一般2～3周，个别的一周之内快速启动）．启动后产酸相（CSTR）出水VFA含量逐步提高，pH在4．35～4．71；产甲烷相（UAS．BAF）出水VFA在启动10d后下降至500mg／L以下，pH在7．21-7．85；UASBAF出水比填料区前出水的各项挥发酸指标都低，这证明填料的好氧预挂膜效果良好，从而加快了反应器的启动速度．研究还提出了“好氧活性污泥培养——污泥沉淀浓缩——喷淋预挂膜”的填料好氧预挂膜技术方案，该方法有助于两相厌氧工艺在中国废水处理领域的实际应用．

In order to accelerate start-up velocity of two-phase anaerobic process, aerobic precoating treatment （10 h） was used in this laboratory-scale experiment. The result demonstrated that rapid start-up could be completed within 13 d, with the high strength refractory traditional Chinese medicine wastewater as substrate and aerobic sludge as seed sludge. This start-up velocity was about four or six times higher than the general sludge （8 - 12 weeks） and the same as mature granular anaerobic sludge （ generally 2 - 3 weeks, sometimes within l weeks）. Effluent volatile fatty acids （VFA） of CSTR（Continuous Stirred Tank Reactor） increased gradually and pH was between 4.35 -4.71 after start - up. Effluent VFA of UASBAF（ Up - flow Anaerobic Sludge Bed and Anaerobic Filter） decreased to 500 mg/L after start-up 10 d and pH was between 7. 21 -7. 85. Effluent VFA of UASBAF was lower than the effluent before filler area, which proved the aerobic pre- coating treatment had a good effect and accelerated the start-up velocity of reactor. The precoating process of ＂aerobic active sludge accumulation sludge sedimentation and concentration--sludge spraying and precoating＂ was put forward, which was useful for the application of two - phase anaerobic process in wastewater treatment in China.