Experimental study on denitrification efficiency impacted by activated sludge filtering bed formed in gas-liquid-solid separating zone

摘要

The experimental study on denitrificaiton of nitrogenous organic wastewater using the co-processes of bio-fluidized bed plus activated sludge filter bed which formed in gas-1iquid-solid separating zone was carried out.Experimental results showed that:1) Non-suppressed nitrification bacteria group by carbon sources was reproduced in the Bio-nuidized bed system.which in turn contributed to the NH4+-N removal efficiency of up to 93％～95％;2)Dynamic and stable sludge filter was formed in the gas-liquid-solid separating zone by the setting of incline-tube and the controlling of precipitation mud condition,Which leaded to the dramatically improving of TN removal rate:3)85％BOD5 removal efficiency and 74％TN removal efficiency was achieved under the operation conditions of HRT Of 1.5h.Aeration of0.25 m3h-3,BOD5 load of 9.2-10.4 m-3d-3 and TN load ofO.65 kgm-3d-1.