The corrugated plate pack in a TPI/ CPI separator, used in Oily water treatment for removal of free oil, consists of number of parallel corrugated plates. A Plate pack is a housing of flat plastic plates (strengthened by resins) and stiffened by a frame made from plastic material (strengthened by resins) and/or stainless steel.
The number of plates in a Plate pack is determined by various calculations as well as based on experience on various effluents and applications. The number of plates per Plate pack is also factored to a certain extent on economy of size of the separator. The number of Plate packs per TPI/ CPI separator is calculated based on the effluent flow and its characteristics to the unit.
The liquid to be treated flows through the spaces between the Corrugated Plates in each Plate pack. Ideal condition for separation is achieved in the TPI (Tilted plate interceptor)/ CPI (Corrugated plate interceptor) separator by simulating a laminar flow condition through the plate pack.
In order to reduce the frictional resistance between the separated material and the corrugated plates to a minimum, particular attention needs to be paid to the smoothness and hardness of the plate surface. The Corrugated Plates as well as the casing of the Plate Pack of TPI/ CPI separator are generally made from glass fiber reinforced polyester resin. This material is resistant to the most frequently used chemical additives and temperature as well as effluents to be treated.
Advantages Of Designed TPI/ CPI Separators in Oily Water Treatment System:
– Low Spare requirement.
– Very low maintenance cost since there are no moving parts.
– High efficiency and capacity combined with compact volume.
– Can handle shock loads of flow without affecting effluent quality significantly.
– Selection can be done from large number of type of basins (RCC, Mild Steel, Stainless Steel) for plate packs in TPI/CPI separators.
A schematic of CPI separator is depicted below.
Disadvantages Of Designed TPI/CPI Separators in Oily Water Treatment System:
– The effluent oil concentration is higher than that of other methods;
– Large surface area required;
– Large volume results in dead zones en reduction of net available surface area;
– Expensive oil/bottom scrapers required that are maintenance intensive;
– Ineffective with small oil droplets or emulsified oil, Require long retention time to achieve efficient separation.