Corrugated Plate Interceptor (C.P.I)

Wastewater requires consent before they can be discharged to the sewerage system and, since they are not desirable in sewers the concentrations of FOG which are permitted tend to be restricted. FOGs are normally separated by means of some form of on-site physico-chemical pre-treatment and secondary-treatment. Pre-treatment is required to separate the free oil and, secondary treatment is applied to remove the oil from the emulsions. Settlement by gravity can effectively remove the oil that is attached to settle able solids.
Pre-treatment
The pre-treatment process removes the oil based pollutants from the wastewater. Essentially, there are three basic types of pre-treatment interceptor equipments:
– API (American Petroleum Instituted)
– PPI (Parallel Plate Instituted)
– CPI (Corrugated Plate Interceptor)
Application
Corrugated Plate Separators (CPS) provide economical and effective removal of oil and solids from wastewater by gravity, in a smooth, efficient automatic flow.Oily water enters the CPS unit to the influent receiving compartment. Here, the velocity is slowed and the flow is directed into the quiescent zone above the CPI pack(s). Gross, free oil droplets rise, and the flow containing residual small free droplets and solids particles enters the CPI in a laminar flow condition. The CPI pack is uniquely designed to increase the separation surface area by using a series of parallel plates, arranged to allow small, free oil droplets to coalesce and separate from the carrier fluid. Separation is based on the differences in the specific gravities of the fluids, the liquid temperature and discharge. Separated oil rises to the peaks of the corrugations in the parallel plates, and then moves upward along these peaks to the top of the pack. As the separated oil is diverted to the top of the separator, it is protected from the flow entering the CPI by a gutter. At the top of the unit, the separated oil forms a layer and is skimmed by an adjustable trough or weir. The clean effluent flows upward through the clear effluent compartment, then over the adjustable effluent weir and out of the separation unit.
CPI is designed and manufactured by high educated experts at Tehran-zist Company.