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The biological aerated filter(BAF)was used to treat the oil-field produced water.The removal effi- ciency for oil,COD,BOD and suspended solids(SS)was 76.3%—80.3%,31.6%—57.9%,86.3%—96.3%and 76.4%—82.7%,respectively when the hydraulic loading rates varied from 0.6m.h- 1to 1.4m.h -1.The greatest part of removal,for example more than 80%of COD removal,occurred on the top 100cm of the media in BAF.The ki- netic performance of BAF indicated that the relationship of BOD removal efficiency with the hydraulic loading rates in biological aerated filters could be described by cr/ci=1-exp(-2.44/L 0.59).This equation could be used to predict the BOD removal efficiency at different hydraulic loading rates.
The biological aerated filter (BAF) was used to treat the oil-field produced water. The removal effi- ciency for oil, COD, BOD and suspended solids (SS) was 76.3% -80.3%, 31.6% -57.9%, 86.3% -96.3% and 76.4% -82.7%, respectively when the hydraulic loading rates varied from 0.6mh-1to 1.4mh -1. The greatest part of removal, for example more than 80% of COD removal, occurred on the top 100cm of the media in BAF. The ki- netic performance of BAF indicated that the relationship of BOD removal efficiency with the hydraulic loading rates in biological aerated filters could be described by cr / ci = 1-exp (-2.44 / L 0.59) .This equation be used to predict the BOD removal efficiency at different hydraulic loading rates.