One of the company’s activities is production of bilge water cleanup equipment. In July 2012 we supplied, tested and commissioned a trunked double-stage installation “Kribrol M / 2” for breaking water-in-oil emulsions with 1 m ³ / h capacity, maximum pressure of 3.5 kgf / cm ², dry weight of 70 kg. A customer was a bunker company collecting bilge water from sea vessels.
Bilge water, we operated with, is a dark opaque emulsion with a suspension of solid particles and floated sludge on its surface. The emulsion was taken from a barge’s holding tank.
Functional principle of the installation:
The medium is pumped into the first stage of the cleanup process (through the inlet pipe 1), where passing through a specially developed filter element is divided into two fractions: water and separated petroleum which accumulates in the upper part of the installation body and is pumped into the receiving container due to internal pressure caused by the opening of valve 5.
From the bottom of the first stage (valve 2) the medium is delivered to the second stage of the cleanup process (valve 3) where it is post-treated by passing through a special finishing cartridge. Petroleum is pumped from the second stage in the same way (by the opening of valve 6).
Purified water passes to the receiving vessel from the bottom of the second stage (valve 4).
Media separation control is performed through inspection windows.
Visual observations after actuation of the installation:
Petroleum bubbles’ floating-up to the upper zone of both stages of the installation body was observed through the inspection windows. At the second stage outlet dark water with no trace of oil film and free of mineral oil but with the characteristic odor of petroleum product was flowing out. There also was traced slight clarification of water compared to the original medium as well as absence of floating particulates.
After opening of oil discharge valves of the first and second stages transparent liquid flowed to the receiving container that by color, smell, texture and greasy mark left was defined as diesel fuel. The collected sample of fuel didn’t show over time any sediment of suspended particles or loss of water.
There were three samples taken:
- 1. Bilge water sample before the installation.
- 2. Water sample, free of oil products, after the installation.
- 3. Separated petroleum.
The laboratory report on oil content in water is the following: sample 1- oil content is 13100 mg / l; sample 2 – oil content is 39 mg / l that makes 0.3% of the original content. Thus, the efficiency of the installation equals to 99.7%. It is possible to achieve a higher level of treatment by adding extra steps. The medium with less number of chemical contaminations will also positively affect the installation’s efficiency.