مصايد الشحوم والزيوت

OIL INTERCEPTOR

SPECIFICATION

The design allows the introduction of any type of liquids for separation so long as there is sufficient specific gravity differential to allow gravity separation.

It is must complete with 4 layer of baffle screen, sediment bucket and deep seal integral trap, to effectively intercept and separate the oil from water. It achieves an average of about 99% of oil removal for intermittent and variable flows of water, oil or any combination of non-emulsified oil / water mixtures when the hydraulic retention time (HRT) is > 5 minutes.

The design must also complete with oil 'draw off' for channeling and separating oil to a separate oil storage tank pending for periodic maintenance disposal.

Interceptor material :

SIZING FOR FROSCO OIL INTERCEPTOR

Correct sizing of oil interceptor is important and crucial:
1. It avoids under-utilisation due to excessive over-sizing.
2. It avoids backflow of oily waste water due to under-sizing.
3. It ensures adequate hydraulic retention time of oily waste water in the interceptor, to achieves optimum separation of oil from water, and thus the maximum % of interception of oil.

Steps to size FROSCO Oil Interceptor
1. Estimate the peak volume of waste water [see note i] either in litres /sec. or gallon/min.
2. Select the oil interceptor model with flow rating equal to peak volume.
3. Provide storage tank [see note ii] size sufficient to accommodate the volumes of liquids to be having the anticipated frequency of removal.

(A) Sizing Method
(1) Covered Area
Peak Flowrate:
Total of hose outlets, equipments etc that continuous discharging to drain line at one time
Example: (Waste Water from Washing sinks)
Sink size: 40 X 30 X 15 cm = 18,000 cc = 18 Litres

To fill up the sink with full water, and discharge it, and to check the time taken to fully discharge the water. It is recorded the time taken is about 30 seconds.
Thus, the flowrate is 18 litres /30 sec. = 8 GPM

(2) Open Area (Uncovered)
Peak Flowrate :
Total area (Length(meter) x Width(meter) x Rainfalls (mm/sec.)
Example: (An open car wash bay area) .
Length = 20 meter, Width=10 meter, Rainfall = 50 mm/hour
Therefore, Peak Flowrate = (20 x 10 x 50/3600 = 2.78 litres / sec.

(B) Sizing for Oil Storage Tank
i To estimate the volume of oil into the interceptor
ii Frequency of maintenance routine (once a month, twice a month, etc.)
iii Size the oil storage tank double the size of the total accumulated oil during the period {50% of oil + 50% of water) to cater for the requirements.

Example: An average of 5 litres daily of black oil is spilled and washed away into the drain lines. Assuming that the contractor (licensed by DOE) is scheduled to come and collect the waste black oil once a months. The total black oil accumulated in 30 days time is about 150 litres. The capacity for oil storage should be double = 300 litres.

Note: The above sizing methods are just a guideline only. In order to achieve better affluent water range, kindly refer to the manufacturer/supplier for further advise.

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