Design And Operating Characteristics Of New High-rate Anaerobic Reactor

As energy-conservation and emission-reduction are strongly advocated today, theresearch of wastewater anaerobic reactors processing technology become hotter and hotter,especially, with the deepen study of Fluid Mechanics and Microbial Technology, it bringsnew breakthrough continuously in the field of anaerobic biological treatment technology. Byadding cylinder, diversion tube and hang-wall biological membrane structure to the inside ofEGSB (Expanded Granular Sludge Bed) reactor, this paper advanced a new EGSB reactorand achieved the purpose of improving its operation characteristic as well as saving energy.Numerical simulations on Fluent software show that the water status within the newEGSB reactor was completely changed, there has been a high up-flow velocity of sludgeexpansion area and low up-flow velocity sedimentation area, and in the expansion areagranular sludge was compelled to act as circulation. The results of new reactor’s realoperation show that the flow condition can make the granular sludge expansion bed keeps ina certain height, and granular sludge in the expansion area of the bed came into a largercirculation movement which promote the mass transfer and at the same time, it improve thegranular sludge molding speed, mechanical strength as well as reactor’s operation load.The study shows that，the improved reactor is superior to conventional EGSB reactorduring its startup and operational phases. While in the same operating conditions, Reactor Ⅰand Reactor Ⅱ (Ⅰ for conventional EGSB reactor, Ⅱ for the new reactor) started successfullyrespectively in57days and in49days, as the load came to6.98kg(COD)/(m~3d). And then,the concentration of influent COD rise gradually from2500mg/L to5000mg/L, the flow inwater increased from3.75L/h to10.7L/h, and HRT reduced gradually from8.53h to3.0h forReactor Ⅱ. And after35-days running, the reactor’s most standing load came to29.7kg(COD)/(m~3d), and in the very period of time, the COD removal efficiency kept at85%, gas production was notable with all parameters stably. But for Reactor Ⅰ, it took42days increased the load only to the final21.03kg(COD)/(m~3d).Beside those, this paper also discussed the adaptability and dispel-efficiency of theanaerobic microbe in granular sludge for the miscellaneous hydroxybenzene wastewater.The results show that anaerobic microbe in granular sludge has strong compatibility to such hydroxybenzene wastewater; anaerobic microbe can be domesticated in a short period oftime and to achieve a certain treatment effect, and also can improve the biodegradability ofthis wastewater.