The filtration step forms part of effluent treatment and is designed to remove Magnesium hydroxide Mg(OH)2 colloids from a high pH effluent stream. The worry is that small amount of free oil entering the effluents upstream (eg due to leak from equipment) will affect filtration. Is anyone aware of industrial practice with similar issues? Is there threshold oil concentration?
Dear Anand
Following Disadvantage of oil in sand filtration
1. The porosity of sand filters will be reduced.
2. Clogging Problem.
3. Back wash frequency will be increased.
4. Running cost will be increased
Following are remedies
1. The oil should be separated before feed sand filters.For this purpose oil remove with gravity separation or Disc oil seperators.
2. If not possible above then it is sugestet for increasing of bed depth specially final bed.(about 18-22”)
3. The sand should be periodically wetted, allowed to consolidate, and then extra sand added. Repeat this procedure until the bed depth has stabilized at 18-22 inches.
4. Regularly maintenance of the sand i.e. replacement of sand regular interval.
5. Oil contents are not allowed beyond 10 ppm in sand filter. if oil contents will present beyond 10 ppm. we can not remove suspended solid from sand filter in back washing.
Regards,
Prem Baboo
You should do pilot testing in smaller scale. The small amount of oil may even assist in removal of Mg(OH)2.
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