Use of stripping tower and reverse osmosis in removal of petroleum hydrocarbons from water

摘要

The universality of occurrence and usage of petroleum leads to higher water environment pollution by oil derivatives products. Taking into account their high toxicity on living organisms, effective methods of water treatment should be found in order to protect health of consumers and natural water resources. In the paper, the issue of petroleum hydrocarbons' removal from C_7 to C_(35) from model water, which means distilled water with addition of diesel fuel and petroleum, was analyzed. The experiments were conducted in order to assess the efficiency of their removing from water with the use of the following combination: stripping tower and reversed osmosis. Technological experiments were done on stripping tower in the conditions of different concentration, stable aeration intensity, and hydraulic load of 1 [m~3/m~2h]. Reverse osmosis was done with pressure of 1.1 MPa and line speed over membrane of 1.1 m/s. Two series were done with the concentration of 252.96 and 192.62 μg/dm~3. Analyzed water was brought to stripping tower, and then, it was exposed to reverse osmosis process. The determination of petroleum hydrocarbons was done on gas chromatograph according to Polish Norm PN-C-04643 and classified as index of mineral oil. As a result of this process, 80% effect of petroleum hydrocarbons removal was obtained.