The refinery is a big polluter. The sludge produced in the refining process has very high processing difficulty. The oily sludge has many kinds and complex nature, and the corresponding treatment technology and equipment also show a diversified trend.
The main use of plate and frame filtration is to first remove non-degradable pollutants such as colloids and oil residue in the sludge.Then use the dehydration centrifuge to separate the oil-water mixture and introduce it into the sewage treatment plant for professional decontamination treatment. Some of the remaining residue directly enters the coke oven for incineration, and some are further processed and used as residual oil for refining.
It should be noted that when the stainless steel plate and frame filter is used for coarse filtration of oil, it is necessary to change the filter cloth frequently, because the viscosity of the oil is very high, it is easy to block the filter cloth mesh, and the cleaning of the oil itself is difficult.Therefore, in order to ensure the efficiency of the primary filtration, it is necessary to constantly observe the use of the filter cloth to ensure that it is not blocked.
For the sludge dewatering treatment, it is generally necessary to use a professional centrifuge, such as a stacked screw sludge dewatering machine. This is a new type of industrial sludge dewatering centrifuge that has just appeared this year. It has the characteristics of continuous operation and not easy to block.
The oil-water mixture that has been removed is suitable for several kinds of recovery or sent to the sewage treatment plant for professional filtration and recovery, or to differentiate itself and recover the oil.
Finally, the residue after the plate frame filtration and the oil residue separated by centrifugation are basically returned to the refining furnace as refinery raw materials, and in a few cases, they will directly enter the coke oven incineration treatment.