Research On Biological Aerated Filter Treatment Efficiency For Media Size And Macrospore Aperture

Biological Aerated Filter(BAF) is an attractive wastewater treatment technique with the advantages of ecnomics grounds,high treatment efficiency and easy operation. As a result ,good performances BAF have been obtained in many wastewater treatment plants.However,there still some problems that need further study in BAF with respect to media size, aeration mode, treatment mechanisms, operational factors, backwashing and influent control.A a bench scale experimental study was carried out with synthetic domestic wastewater as the model water,focusing on the oxygening efficiency of different ceramist media size and different macropore aeration aperture,but also focusing on the wastewater treatment efficiency of optimzied media size and macropore aeration aperture combination of BAF. It can be drawn the following conclusion derived from the experiment results.1, The parallel experimental results showed that a better effect for oxygen transfer coefficient, oxygen utilization ration and power efficiency of oxygen supply could be achieved in the small size media(3~4mm) filter than that in the large size media (5~6mm) filter in the context of different influent air volume and macropore aeration aperture combination.2, The oxygen transfer rate of 2mm aperture macropore aeration pipe was better than that of 3mm and 4mm aperture macropore aeration pipe,at the same time ,4mm aperture excelled than 3 mm aperture a bit. At the same reactor,there was no obvious laws on the oxygen transfer coefficient of different aeration aperture.3 , In the pure water oxygen aeration experiments, the oxygen supply capacity of three aperture macropore aeration pipe increased with rise in influent air volume; there was a minimize value of oxygen utilization ratio(E_A) between 0.1 and 0.4 m~3/h influent air volume.The trend of power efficiency of oxygen supply(Ep) first decreased and then increased with decline in influent air volume. .In the wastewater oxygen aeration experiments, the trend of oxygen supply capacity was similar with that of pure water oxygen aeration experiments, oxygen utilization ratio(E_A) and power efficiency of oxygen supply(Ep) increased with decline in influent air volume.4, It was found that increase of COD load did not affect COD removal on condition that the COD load is less than 15kg/(m~3.d) but ammonial removal was...