... Description We developed and fabricated KQL-1 walnut shell filter in 1987 for treating oily water in Shengli Oilfield to ... water quality, reduce treating cost and enhance recovery ratio. The filter was awarded national prize. Now, series of walnut shell filters ... ,L/m2s6.3Design pressure, MPa0.62.0Design temperature,ÂșC 80 Filter velocity, m/h2434Backwash time, min.2025Filter resistance (single stage, ...