SEPARATOR LIQUID PETROLLEUM HYDROCARBON

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Purpose

 

 Separators Liquid petroleum hydrocarbon (LPHS) serve for the separation of free petroleum and gasoline products that are washed off from parking and lay-out areas and the like. Coalescence is the basic physical process applied in the separator. This process can be completed with a sorption effect.


 


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 Process
 

Separation of petroleum products uses a principle of double-stage separation.Lighter petroleum products float over water surface and heavier particles settle down in a settling zone. Then pre-treated water flows through a coalescent filter and through a sorption filter, if need be, for final purification. Water flows through an inlet piping in a settling zone where a downflow baffle is installed. In this settling zone floating and settleable particles are separated with respect to their different density. Then pre-treated water flows over a partition to the other zone.

The other zone is provided with coalescent filters. When water flows through coalescent filter petroleum particles coagulate in clusters and float up to water surface from where they are skimmed off. If a sorption filter is fitted then floated and dispersed petroleum products are separated more efficiently. Sorption substances are put in polypropylene baskets that are attached to supporting frame of liquid petroleum hydrocarbon separator.


 

Legend:

1. Inflow, 2. Downflow baffle (baffling), 3. Settling zone, 4. Overflow crest, 5. Scumboard (to trap floating impurities), 6. Baffle wall (baffling), 7. Coalescent filter I, 8. Coalescent filter, 9. Coalescent zone, 10. Effluent weir, 11. Outflow

 

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Design Description

 

Liquid petroleum hydrocarbon separators are plastic tanks with inner equipment – coalescent and, if need be, sorption filter. Plastic liquid petroleum hydrocarbon separator is a complete packed container of expended polypropylene of a self-supporting design. It is positioned on a reinforced-concrete slab. Polypropylene tank is divided into two zones separated with a baffle wall. The top of the baffle wall is provided with an overflow. Several baffle walls and scumboards are installed inside the tank. The liquid petroleum hydrocarbon separator is designed with respect to valid hydrodynamic calculation and requirements for gravity separation of floating petroleum products including the effect of coalescent/sorption filtering.

Entering wastewater is stilled down and then flows through a downflow baffle to a settling zone and through a coalescent filter, floating petroleum products are entrapped on water surface and are manually scummed off. If a separator is provided with a sorption filter then wastewater passes through this filter and the filter entraps even the smallest petroleum drops.

Entrapped petroleum products are collected and have to be disposed of in special-purpose plants – incinerating plants, etc. If a sorption filter is installed it has to be replaced after its saturation with petroleum products. Special-purpose plants dispose of saturated sorption filters.
 


 

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Structural drawing


 

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Basic Specifications

 

 

Type Max.Flow Area   Dimensions in mm
l/s m2 Lenght Width Height In. Out. DN

 

 LPHS with coalescent filter

 

 NEL at outflow under 5 mg/l
 LPHS 2    2   170  2000  1000  2020  1700  1500  100 
 LPHS 3     3    250 3000  1000  2020  1700  1600 150 
 LPHS 6     6     500  3000  1660  2080 1700  1600 150
      LPHS10  10   830 4000 1660 2080 1850 1650  200
 LPHS 15  15  1250 4000 2160 2300 1950 1850  250
 LPHS 20  20  1700  5000  2160 2300 1950 1850  250
 LPHS 30  30   2500   6000  2160 2300  1950 1850 250 
  LPHS with coal. and sorption filters       NEL at outflow 0,5 mg/l
LPHS 2-S   2     170  3000 1000 2020  1700  1500   100
LPHS 3-S   3     250 4000 1000 2020 1700  1500   150
LPHS 6-S   6      500  4500 1660  2080  1700  1500   150
     LPHS10-S 10      830  6000 1660 2080  1850  1650   200
     LPHS15-S 15    1250  6000 2160 2300  1950  1750   250
     LPHS20-S 20    1700  7500 2160 2300  1950  1750   250
     LPHS30-S 30    2500  10300 2160  2300  1950  1750  250 

 

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 Performance

 

Petroleum product content of wastewater passing through the separator is reduced by 85 up to 95 % with respect the separator type used. This high efficiency enables trouble-free outflow of effluent rainwater from parking areas directly to a recipient.


 

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Layout in location

The figure shows the layout of a ADOS’s LPHS unit for treatment of rain waters from parking lots. A similar layout is applied for the LPHS location from garages, petrol stations, vehicle maintenance shops and the like.