The influence of the size of walnut shell filter material on the treatment effect

The pollution of oil field washing wastewater is serious and the arrangement of water injection wells is scattered, which is difficult to treat. Using centrifugal separation and micro-flocculation filtration technology, it has a small footprint and high processing efficiency, and it is easy to develop into a small mobile processing equipment. Choosing a new type of nut shell filter material—walnut shell as the filter material, and investigating the effects of different particle sizes, filtration speeds, and coagulant dosages on the removal of oil and turbidity, we have drawn the following conclusions.
      In the 12h filtration cycle, the oil removal rate is above 88.5%. The smaller the particle size, the higher the removal rate. In the initial stage of filtration, the filter column with a small particle size has a higher removal rate of turbidity, but as the filtration time increases Extend it to the 9th hour, the removal rate drops rapidly. This is because the filter material with a smaller particle size has a small porosity and a small amount of trapped pollutants. It is the first to reach saturation and be penetrated. Considering the influence of particle size on the removal effect of oil and turbidity and the filtration cycle, the filter material with particle size of 0.45-0.9 is used.
The filtration rate has a significant effect on the removal of oil and turbidity. In the initial stage of filtration, the removal rate of oil and turbidity is above 90%. However, with the extension of the filtration time, the removal rate of the filter column with a filtration rate of 20m/h decreased significantly, while the filter column with a filtration rate of 10m/h and 6m/h still maintained a high removal rate, so the optimal filtration rate was determined Around 10m/h.
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