Hydrodynamic Mixing Characteristics Of Anaerobic Baffled Reactor(ABR)

The anaerobic baffled reactor (ABR) is a new sort of anaerobic reactor, but at home and abroad the environmental workers couldn't knew clearly about it real working principium. In this study, a lab-scale ABR reactor was established, while experiments on the characteristics of expanded granular sludge bed and residence time distribution (RTD) were conducted under different hydrodynamic residence time (HRT) conditions. Under thorough analysis with multi-phase CSTR model and diffusing model, correctional diffusing model with two new parameters can analyzing RTD result perfectly.Through these work, some conclusions can be drawn: firstly, comprised with other anaerobic reactors' dead zone, the dead zone of ABR's was the least, which is between 13%-18%. The reason is that vertical board in reactor held up granular sludge and enhanced current confusion. Secondly, when the reactor working steadily, along with HRT changing from 8h to 24h, parameter N result is from 5.28 to 12.5 and parameter 1/Pe result is from 0.095 to 0.04. Thirdly When we use multi-phase CSTR model and diffusing model, we cannot get the right curve to analyse the condition in the reactor. The differences between fitting curve and experiment data mean that the complex condition in reactor exceeded their using qualification. After deep analyse multi-phase CSTR model and diffusing model, the diffusing model have resembling principle with the reactor, but something must be done to modify diffusing model, and the best curve will be get. Adding two new parameter α and β, the result is that α is from 0.604 to 0.674 and β is from 0.826 to 1.27, when HRT increasing from 8h to 24h. R~2 is better than 90% comparing with the experiment data.