The pilot study of enhanced processing against coking wastewater for nitrogen removal in a direct-pass way

摘要

From the submerged anaerobic and anoxic pools which have cellular structured fibers fillings for their cross-section,the outbound gas was collected to be re-blown back into the same pool.The aerobic reactor was a Membrane Bio-Reactor(MBR)taking an airlift loop,the activated sludge concentration reached as high as 10-12 g-L-1.During the pilot experiment.an AOA process against coldng wastewater was developed in a direct-pass way.The effluent from the first anaerobic phase was diverged which 10％would not go through the aerobic phase and would go to the third staged pool as a supplemental carbon source.for denitrification.The experiment showed that for influent averaged 2450 mgL-1 CODcr and 95 mgL-1 NH4+-N,the system got a stable effluent of 124 mgL-1 CODcr and 9.8 mg.L-1 NH4+-N.Compared with these ongoing large-deployed A2O2 projects with a 2-4 reflux ratio.this non-reflux technique without sedimentation only consumed one half of the power and shrank down to one third in space.Also compared with the Methanol supplemental carbon sourced OA technique.the forehead anaerobic stage reduced the organic loading of the aerobic phase,COD removal was improved and the extra expense for Methallol was avoided.