Filter presses use a high pressure pump to force sludge through a 50 micron filtration screen. This mechanical force dewaters sludge for disposal, purifies a product or breaks emulsified slop oils. TRADEBE has been able to break and separate many slop oil emulsions that cannot be chemically separated. If waste cannot be separated using filtration, centrifugation can be used.
Decanters - Horizontal Centrifugation
Sludge can be separated by using differences in density between water, oil and solids. Decanters use centripetal force to separate the two or three phases. Two phase centrifugation separates liquids and solids, while three phase centrifugation separates difficult oily sludge into water, oil and solid cake. Good quality recovered oil can be separated and re-used by the refinery. Water removed can be treated through the refinery’s effluent treatment system. The solids produced are easy to handle and can be stored in containers prior to thermal treatment or disposal.
Vertical Disk Stack Centrifugation
Vertical centrifuges are able to clean liquid phases using centripetal forces generated by high speed rotation in a centrifuge. These are usually used on the oil phase after treatment through a horizontal centrifuge, but they can also be used to treat slurry oils to remove catalytis. With Vertical Disk Stack Centrifugation, a disc stack centrifuge separates solids; and one or two liquid phases from each other in a continuous process. The denser solids are forced outwards by centrifugal forces while the less dense liquid phases form inner concentric layers. By inserting special plates, (disc stack), where the liquid phases meet, maximum separation efficiency is ensured. The solids can be removed manually, intermittently or continuously depending on the specific application. The clarified liquids overflow in the outlet area on top of the bowl into separate chambers sealed off from each other to prevent cross contamination. This enables us to achieve oil with water and solids content of less than 0.5%.
Thermal desorption vaporizes water and volatile contents in sludge through indirect heating in an anaerobic chamber. TRADEBE can apply for all permits necessary to install and operate a Thermal Desorption unit on your site.
Low Temperature (150-300ºC [302-572ºF]) produces a final solid for disposal.
High Temperature (above 400ºC [752ºF]) achieves a higher level of minimization by extracting all organic compounds.
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