modified fiber ball filters applied to oily wastewater fine filtration in oil field, but also to other industrial wastewater treatment.the mechanism of the modified fiber ball that remove oil and impurities is: Direct interception, inertia interception and electrochemistry adsorption. Water quality before filtration oil max 15mg/L, Suspended matter max 10mg/L; Water quality after filtration oil max 5mg/L, Suspended matter max 2mg/L, granulation max2μm. After modified processing, textile fiber ball surface enhance the adsorptive capacity from oil and impurity; Textile fiber ball new ligation way, when moves the filter bed percentage of voids reduced gradually along the fluent direction, forms quite ideally porosity distribution condition of small pore, the filtration effect is better; The rate of percolation is high, may reach 25-30m/h.Filters material only need supply about 10% every year, without replacement. The modified fiber is ideal fine filtration product which is suitable for oily sewage treatment because it is more hydrophilic and oleophobic, as well as good anti-washing of regeneration. Technical parameters : water quality before filter Oil max20mg/L Suspended matter max20mg/L water quality after filter Oil max2mg/L Suspended matter max1.5mg/L Size ratio to grade max1.5μm COD removal rate min60%