Study On Romoval Trace Oil Pollutants By Activated Carbon Adsorption In Drinking Water Source

Take the adsorption treatment of trace oil pollution in drinking water source as object, study on adsorption removal of trace oil pollution in drinking water source by activated carbon. In practice, the powder activated carbon was added in the sedimentation tank, and the granular activated carbon used as an adsorption column. Therefore, the experiment is divided into static intermittent test with powdered activated carbon and granular activated carbon adsorption continuous assay test two parts.The powdered activated carbon adsorption tests were done in the beaker, the results showed that the powdered activated carbon used in experiments on the oil go well with Langmuir adsorption isotherm, and its adsorption isotherm equation when temperature is 15℃in the experiments is(?). The affecting factors of powdered activated carbon purification were investigated, the results showed that when the activated carbon dosage to 12 mg/L, the water of oil removal efficiency can reach 90%; when adsorbed to 6 h, the water adsorption equilibrium was achieved, the removal rate will not decrease; and the removal efficiency of oil in water decreased slightly with the experimental temperature growth.Granular activated carbon adsorption column experiment showed that when the velocity is rising the treatment efficiency of the oil by activated carbon in the column is decreasing; the oil in the raw water flow through the column longer the oil be attracted is larger and the oil in the adsorbed water is lower. Therefore, in the actual water treatment, the adsorption column length and the filtration rate are the main factors. The lower filtration rate make the longer time between the water and the activated carbon, then the adsorption efficiency is higher; the adsorption column is longer, the adsorption efficiency is higher.To Calculate the adsorption capacity of the oil by the granular activated carbon adsorption in the column, and compared with the absorption saturation capacity. The results showed that the adsorption capacity of the granular activated carbon in the column is about 20-30 percent of the absorption saturation capacity at the filtration velocity of 4m/h,6 m/h and 8 m/h. The utilization of the granular activated carbon is lower. To improve the utilization of activated carbon, the filtration rate should be reduced and the touched time between the activated carbon and the water should be increased.