Our mill throughput is 45MT/Hr FFB. The effluent from oil room goes to a concrete sludge pit with a RT of 3-4 hrs and without a oil skimmer. The overflow is then pumped through a Centrifugal pump to a Vertical Clarifier with 4 hrs RT acting as Oil Recovery Tank before been discharged to the POME cooling pond. The oil recovery tank has a stirrer and 100 mm of top layer is skimmed to recycle back to the oil room.
I am doubtful of this design as we have heaps of sludge oil found in our cooling ponds year round.
Please advise...
When you say heaps of sludge oil, please quantify how many tons of Sludge Oil per 1000 tons FFB.