Ultrafiltration The Treatment Of Oilfield Produced Water And Its Mechanism Of Membrane Fouling

The paper discusses the origin of the oil-field produced water, the existing state and characteristics of its pollutants, and it especially points out that the low permeability oil field produced water in North Shaanxi involves the characteristics of high chlorine, high salinity and high oil. Most of all, the paper evaluates the developing tendency of the techniques hi this field home and abroad.Some conclusions inferred from the experiment of ultrafiltration treating oil-field produced water include that the removal efficiency of the experiment is so good that the permeate flow can meet the reinjection standard, the change of the cross-flow velocity has little effect on the flux under the constant transmembrane pressure, the flux is highly affected by the transmembrane while the cross-flow velocity is fixed, and the membrane flux decreases gradually with the increase of the inflow concentration tunes.The paper takes complete blocking filtration model in Field model to speculate the declining regularity of membrane flux and the fouling condition of it in the experiment, to calculate the related parameters and to determine the specific mathematical model of membrane fouling. The result suggests that the flux in complete blocking filtration model has little difference with that of the experiment, which will instruct the following researches.Meanwhile, we also carry out experiments on the relevant contributions of membrane resistance during ultrafiltration, and draw the conclusion that MWCO(molecular weight cutoff) and the membrane materials play important roles in affecting the contributions of membrane resistance. Therefore, hi practice, we can choose appropriate membrane according to the contributions.