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This study investigated the Biological Aerated Filter for micro-polluted raw water organics , ammonia , UV 254 , turbidity removal efficiency , effects of hydraulic loading , hydraulic residence time , temperature , gas-water ratio backwash , impact load , filter off the effects of the biological Aerated Filter process . The test results show that the Biological Aerated Filter can effectively remove the micro-polluted raw water the COD Mn , ammonia , UV 254 , turbidity, dimethyl phthalate (DMP), phthalic acid ethyl ( DEP ) , dibutyl phthalate (DBP) phthalate, di (2 - ethyl hexyl ) phthalate (DEHP) and other pollutants . Hydraulic loading 5.0m 3 / ( m 2 · h ) , hydraulic retention time of 40min , the gas-water ratio is 1:1 , the water temperature is 5 ~ 28 ℃ , COD Mn , ammonia nitrogen, UV 254 , turbidity, DMP , DEP, DBP , DEHP removal was 18.97 to 49.00% , 83.67 to 98.84 percent , 1.18 to 12.35% , 82.08 to 97.52% , and 58.03 to 98.19 percent , 19.28 to 92.75% , and 19.18 to 97.40 percent , 38.15 to 85.90 percent . Hydraulic retention time and the increase in temperature can improve the treatment effect of the Biological Aerated Filter ; Biological Aerated Filter for the ammonia shock resistance ability of the load and organic shock loads ; backwash small impact on Biological Aerated Filter ; filtration pool closure of biological Aerated Filter also smaller , restart recovery in a relatively short period of time . In biological aerated filter process to remove humic acid test , hydraulic loading 5.0m 3 / ( m 2 · h) , hydraulic retention time of 40min gas-water ratio of 1:1 , temperature 22 ~ 28 ℃, 6.07 ~ 21.7mg / L, the stable operation of the state of the process , the average removal rate of humic acid 48.61% of influent concentration of humic acid . Biological Aerated Filter , biofilms present in dispersed form in the filler surface , does not completely cover the surface of the filler distribution of the biofilm amount is gradually decreased along the flow direction bottom- . Terminal globular bacteria in the influent of the reactor , the more coryneform bacteria , coryneform bacteria , the relative reduction in the water outlet side , more filamentous bacteria .
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