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...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.展开更多
The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids （SS）. A small-scale fixed film biological aerated filter （BAF） process was used to treat the wastewater. Th...The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids （SS）. A small-scale fixed film biological aerated filter （BAF） process was used to treat the wastewater. The influences of hydraulic retention time （HRT）, air/water volume flow ratio and backwashing cycle on treatment efficiencies were investigated. The wastewater was treated by the BAF process under optimal conditions： the HRT of 1.0 h, the air/water volume flow ratio of about 5 ： 1 and the backwashing cycle of every 4-7 days. The results showed that the average removal efficiency of COD, oil pollutants and SS was 84.5%, 94.0% and 83.4%, respectively. And the average effluent concentration of COD, oil pollutants and SS was 12.5, 0.27, 14.5 mg·L^-1, respectively. The experimental results demonstrated that the BAF process is a suitable and highly efficient method to treat the wastewater.展开更多
In the present study, the aflatoxin B1 contamination at various stages of oil refining and in refined oil were carried out. This was subsequently compared with commercial vegetable oil samples. Among the 23 different ...In the present study, the aflatoxin B1 contamination at various stages of oil refining and in refined oil were carried out. This was subsequently compared with commercial vegetable oil samples. Among the 23 different sunflower oil samples were tested, 10 of them showed posi-tive results to AFB1 and the remaining 13 showed negative results to AFB1. All the refined oil samples were free from AFB1 contamination.展开更多
基金Supported by the National Natural Science Foundation of China （No.59978020）.
文摘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.
基金Supported by the Foundation of Science and Technology Project of Guangdong Province (2004B33301001)
文摘The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids （SS）. A small-scale fixed film biological aerated filter （BAF） process was used to treat the wastewater. The influences of hydraulic retention time （HRT）, air/water volume flow ratio and backwashing cycle on treatment efficiencies were investigated. The wastewater was treated by the BAF process under optimal conditions： the HRT of 1.0 h, the air/water volume flow ratio of about 5 ： 1 and the backwashing cycle of every 4-7 days. The results showed that the average removal efficiency of COD, oil pollutants and SS was 84.5%, 94.0% and 83.4%, respectively. And the average effluent concentration of COD, oil pollutants and SS was 12.5, 0.27, 14.5 mg·L^-1, respectively. The experimental results demonstrated that the BAF process is a suitable and highly efficient method to treat the wastewater.
文摘In the present study, the aflatoxin B1 contamination at various stages of oil refining and in refined oil were carried out. This was subsequently compared with commercial vegetable oil samples. Among the 23 different sunflower oil samples were tested, 10 of them showed posi-tive results to AFB1 and the remaining 13 showed negative results to AFB1. All the refined oil samples were free from AFB1 contamination.
