Train Black Water Treatment Using Anaerobic Baffled Reactor Followed By Anaerobic Filter Process

Along with development of the high speed train and more focus on the railway environment, the treatment of train black water becomes an urgent problem to be resolved. The application of anaerobic process to the treatment of train black water was studied.The process of anaerobic baffled reactor (ABR) followed by anaerobic filter (AF) was used to treat train black water in this research. A light mobile bio-packing was filled in the two reactors. The objective of wastewater treatment was to satisfy gradeⅢspecified in the Integrated Wastewater Discharge standard (GB8978-1996). The experiment contents included the domestication of sludge, the optimization of ABR reactor operation and the operation of ABR follow by AF process.While the sludge in the ABR reactor was domesticated, organic removal efficiency was around 50%, most of the SS concentration was less than 400 mg/L. Sludge was re-domesticated for improvement, experimental results showed that the anaerobic activated sludge from pharmaceutical factory was domesticated with low load way, optimum domestication effect appeared, organic removal efficiency was 70%; sludge from the secondary sedimentation tank of Jizhuangzi municipal wastewater plant was domesticated with septic tank effluent directly, organic removal efficiency was around 60%, and the microorganisms had strong capacity in resisting shock load.Analysis of the ABR impact factors showed that the optimum operating HRT of ABR process was 72 h with the organic removal efficiency of 60-70% compared with the operating HRT of 18 h, 30 h and 48 h; considering the promotion of ammonia nitrogen to the methanogenesis activity of the anaerobic granular sludge, the appropriate influent ammonia nitrogen concentration of ABR was from 500 mg/L to 1500 mg/L; the average removal efficiency of organic matter under mesophilic condition (34±1℃) was approximately 63.4%, higher than that under normal temperature operation (28±1℃) of 48.6%.Operation results of ABR followed by AF process indicated that the organic concentration of AF effluent was below 500 mg/L, and organic removal efficiency was above 80% with a maximum removal efficiency of 87%; the removal of TN, NH4-N and TP were poor; SS concentration of AF effluent was below 400 mg/L in stable running. The treatment effect of train black water using ABR followed by AF process could satisfy gradeⅢspecified in the Integrated Wastewater Discharge standard (GB8978-1996).