OIL EXTRACTING SYSTEM BY GRAVITY

FLOW DIAGRAM
Map
1.	Arrival of waters to be treated	6.	Accumulation of extracted oils
2.	Product for sludge collection	7.	Oil absorbing filters
3.	Extraction of waters and sludge	8.	Sample taking pit
4.	Product for oils collection	9.	Discharged of treated waters
5.	Extraction system

The waste waters coming from settlements which use oils and grease in their working cycles (garages, panel beaters, car washes, etc …) can be treated with oil extracting systems by gravity.

With this system the water is introduced into static chamber where the oil floats to the surface and the purified water can be thus discharged.The process has three different phases:

	decantation and sludging in order to hold the waters long enough to separate the sedimentable substances (sludge, soil, sand, etc …);
	oil/grease extraction in order to create a still tank where the oil/grease can float to the surface and be separated from the water through a small extraction canal mechanically regulated
	filtration through oily-absorbing panels in order to further reduce the out-going oil concentration to be used in particular cases according to the characteristics of the incoming waters.

The size of the systems depends on the quantity of water to purify, on the concentration of oily substances and their physical-chemical composition, which must be analysed in each single case.

The maintenance of the oil/grease intercepting tanks is simple and it consists of the following operations:

	frequent removal of the oil;
	removal of the sludge;
	disposal of the oil.

The range of oil/grease intercepting tanks produced by Boer Depurazioni includes the following products with different capacities:

BM	1		up to 1 l/s
BM	3		up to 3 l/s
BM	10		from 3 to 10 l/s
BM	20		from 10 to 20 l/s
BM	30		from 20 to 30 l/s
BM	40		from 30 to 40 l/s

For higher capacity over 40 l/s and up to 100-150 l/s new system solutions have been studied. They foresee a thorough analysis of each single case.

Mod. BM1 capacity 1 l/sec.
Mod. BM3 capacity 3 l/sec.
Mod. BM Modul Compact capacity from 10 to 40 l/sec.