Product Description
The tilted plate oil interceptors is an oil-water gravity separator, is suitable for oily wastewater treatment and rainwater run-off. Tilted plate oil interceptors enables high efficiency gravity separation with corrugated plates, providing excellent treatability with a high flow rate.The simple structure makes it possible to reduce the construction cost and facilitates maintenance.Tilted plate oil interceptors is mainly used to remove bulk oil from the water.
The basin can be executed in steel or concrete. The concrete units are specifically suited to integrate with sewer systems below ground level so that a gravity flow can be used. The steel CPI can optionally be supplied with integrated oil sump and/or effluent sump or with a gas-tight cover.
The tilted plates are located at short intervals, providing high oil-water separation efficiency. This makes it possible to stably treat rainwater even when the amount of rainwater treated is two or even four times larger than usual.
WORKING PRINCIPLE-
The Principle of Gravity Separation:
Separation by gravity utilises the density difference between oil and water. An oil globule (50 micron & above) in water will attain a constant rising velocity when the resistance to motion caused by the water is equal to the rising force created by the density difference.
The important characteristics for a separator using this principle are:
a) The distance through which the oil globules travel between two plates of the plate pack.
b) The rate at which the oil globules rise through this distance.
These two factors govern the resistance time in a separator and therefore, its size.
For efficient operation, the vertical distance travelled by the oil droplet should be made as short as possible.
The rising velocity is increased by the agglomerating small globules thus creating larger, faster rising oil globules (coalescence).
Any break up of these oil globules by even slight, local or general turbulence, will reduce the efficiency of the separator. Consequently, the flow through the unit and in the upstream piping system should be as laminar as possible. By using parallel corrugated plates inclined at 45-60 deg. the TPI optimises the conditions of short vertical travel under stable laminar flow and maximum separating surface area. The plates are used in "Counter-Current" mode to obtain a compact installation.
The TPI consist of a number of inclined corrugated plates mounted parallel to each other usually at spacing of 2 cm. The raw water containing the oil and suspended solids passes between the plates from top. Laminar flow conditions are essential for the effective gravity separation of the water, the oil and suspended contaminants. In the course of passing from pack inlet to pack outlet, the oil floats upwards into the tops of the corrugations and rises up the incline of the plate to the surface of the system where it is removed by a skimmer. The sludge moves towards the bottom of the corrugations and slides down the incline of the plate spacing. From there the sludge is collected in a hopper to be discharged intermittently through a blow off valve manually or settled sludge cannot recontaminate the treated water.
The simultaneous migration of oil droplets into the corrugation tops and of sludge particles into corrugation bottoms has a major effect upon the operation of the separation system. In the corrugation tops a very high oil concentration is established. This is the ideal condition for oil coalescing to takes place [coalescing is the formation of a few large oil drops out of many small droplets due to droplets due to droplets (collisions)].
In the corrugation bottoms a high sludge concentration is established. This is the ideal condition for particle agglomeration to take place. (Agglomeration is the formation of large and relatively heavy particles from small and relatively light particles).
The oily water flows from the top of the pack and then over an effluent weir into the treated water chamber. The oil droplets coalesce into larger droplets and flow counter-current through the pack into the surface. Here, a layer of oil forms which is then skimmed off through a slotted pipe skimmer. This is highlighted by the enclosed sketch.
DESIGN OF THE PLATE PACK
The plate pack consists of corrugated plates stacked parallel at 2 - 4 cm intervals. If desired the intervals can be altered afterwards by reducing or increasing the number of plates in the system.
Separated oil collects under the top of the corrugations and sludge collects in the troughs of the corrugations.
The plates are mounted between 45 - 60 deg. to the horizontal. Consequently, collected oil flows upwards to the surface of the system and sludge will align into the sludge collecting hopper.
For getting in touch , please visit us at www.kpack.in or send me mail - prateek.kpack@gmail.com
7 июн 2018
