RU2466238C1 - Method to collect spilled oil from water surface - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: ferromagnet finely dispersed absorbent is sprayed onto water surface contaminated with spilled oil. Then oil, absorbent and water are collected for further water cleaning. The collected mixture is pumped through a magnetising device, where ferromagnetic particles in an oil shell are magnetised. The magnetising device includes magnetic plates with an antifriction coating. Then the mixture is sent to a turbulence promoter, in which ferromagnet absorbent particles are coagulated. Aggregated agglomerates of absorbent with oil are separated from water by deposition or filtration.

EFFECT: efficient removal of oil and oil products from water surface and further cleaning of water from oil and oil products.

Description

The invention relates to the field of magnetic treatment of water and can be used to remove oil and oil products from the surface of the water.

Known ferromagnetic sorbents for wastewater treatment [1, 2], followed by the collection of contaminants using a magnetic trap.

The disadvantage is the difficulty of operating a magnetic trap. As a rule, this is a magnetic filter having a complex structure, difficult to operate and requiring constant cleaning.

A known method of coagulation and removal of ferromagnetic particles from a fluid or gas stream [3], including the supply of oil to a fluid or gas stream, passing the stream through a device for coagulating ferromagnetic particles on the surface of permanent magnets. The process of particle accumulation on the surface of permanent magnets is controlled by changing the flow regime of a liquid or gas stream. When coagulating and removing particles, oil or oil products play an important role - they contribute to the formation of a larger agglomerate, keep the agglomerate in the stream and are filtered together with the particles.

The disadvantage of this method is the difficulty of creating a water flow regime on the surface of permanent magnets that promotes coagulation of particles on a magnet, and therefore there is no guarantee of coagulation of particles together with oil, as a result of which the efficiency of further removal of particles and oil by filtration can be very low and, therefore, low water treatment.

A known method of cleaning the surface of the water from oil and oil products [4], including processing contaminated with oil (oil products) of the water surface with a finely dispersed linear styrene block copolymer with an unlimited degree of swelling. The method provides water purification from oil pollution due to the formation of a durable rubber-like carpet and a more complete and easy collection of thickened oil.

The disadvantage of this method is when cleaning the surface from an oil spill and collecting a thickened film, the low efficiency of separation of water collected together with the film from the sorbent with oil.

The objective of the invention is the effective removal of oil and oil products from the surface of the water and further purification of water from oil and oil products.

The problem is solved in that the method of collecting oil spills from a water surface involves spraying a ferromagnetic finely dispersed absorbent and collecting the absorbent with oil. The mixture of water, oil, and absorbent collected from the surface is pumped through a magnetizing device, including magnetic plates with an antifriction coating, and then through a turbulator, in which coagulation of the ferromagnetic particles of the absorbent is carried out, and then the larger agglomerates of the absorbent with oil are separated from the water.

The essence of the proposed method is as follows. First, a ferromagnetic finely dispersed absorbent (for example, magnetite particles with an average diameter of 0.1 mm) is sprayed onto a water surface contaminated with an oil (oil product) spill. Then oil, absorbent and water are collected for further purification of water from oil and absorbent. To do this, the mixture is pumped through a magnetizing device, including magnetic plates with an anti-friction coating, where the ferromagnetic particles in the oil shell are magnetized. The antifriction coating reduces the adhesion force between the particles and the magnetic plate, which prevents the particles from fixing in the case of deposition on the plate - the magnetized particles are carried away by the flow and the magnetizing device is not contaminated. Then the mixture is sent to a turbulator, in which turbulent coagulation of ferromagnetic absorbent particles is carried out. Agglomerates are formed due to the forces of residual magnetization and adhesion. Further, the aggregated agglomerates of the absorbent with oil are separated from the water by precipitation or filtration.

Example. Oil was collected from the surface of the water after atomization of the ferromagnetic fine particles. Then from the tank a mixture of water, oil with a ferromagnetic absorbent passes through a magnetizing device based on permanent superstrong magnets, then through a turbulator and a filter unit. Measurements of the oil content in water were carried out at the following points: in front of the magnetizing device, after the magnetizing device in front of the turbulator, after the filter unit. The results of water quality control are presented in the table.

Place of measurement of oil in water The oil content in water, mg / l in front of the magnetizing device (initial content) thirty after the magnetizing device to coarse and fine filters thirty after filter installation 0.5

As a result, in general, the efficiency of water purification from oil is 98%.

Thus, this method allows you to remove spills of oil (oil products) from the surface of the water and effectively purify water from oil and oil products.

Information sources

1. A.S. 1787522 USSR, B01J 20/06, 1993.

2. A.S. 1787521 USSR, B01J 20/06, 1993.

3. RF patent No. 2410332, C02F 1/48, 2011.

4. RF patent No. 2297388, C02F 1/28, ЕОВВ 15/04, C02F 103/08, 2003.

Claims (1)

A method of collecting oil spills from a water surface, comprising spraying a ferromagnetic absorbent and collecting an absorbent with oil, characterized in that the mixture of water, oil and absorbent collected from the surface is pumped through a magnetizing device including antifriction coated magnetic plates, and then through a turbulator, in which coagulation of the ferromagnetic particles of the absorbent is carried out, and then the aggregated agglomerates of the absorbent with oil are separated from the water.