SU1242197A1 - Method of cleaning oil-bearing water - Google Patents

Description

one

The invention relates to the field of purification of oily water, such as wastewater, and can be used in all sectors of the national economy, the wastewater of which is contaminated with oil and oil product 1, 1, for example, in the oil industry for the treatment of oilfield wastewater.

The purpose of the invention is to improve the efficiency of purification of oily water.

The essence of the proposed method is that in a layer of granulated material with hydrophilic properties placed under a layer of granulated material with coalescing properties, there is a redistribution of water and oil flows, namely, the water after this layer goes in the drip mode, since the granulated material is well wetted water Due to this, drip and film oil are formed into streams, the sizes of which depend on the size of the pore channels between the granules with hydrophilic properties. :

Thus, the oil contained in the water in the form of droplets, films, small particles flows through the interpore channels of the granules of the additional layer, which significantly reduces the effect of coalescence of oil particles and improves the conditions for the introduction of this oil into the contact mass of oil in the form of streams and If not with her.

As granulated material with hydrophilic properties, broken glass, bits of tile, hard rock, glass balls, metal chips, Raschig rings, ceramics, minerals with ionic crystal lattices (oxides and their hydrates carbonates, silicates, sulfates, phosphates, etc.), semiconductors, etc.

Example. Pure water with a layer thickness of 800 mm is poured into a glass column with a diameter of 400 mm and a height of 1800 mm, then a layer of oil with a thickness of 500 mm is placed on it. In the layer of oil, glass granules with a grain size of 5–8 mm and a layer thickness of 250 mm are placed first in mesh cylindrical vessels, and then above it granulated coal with grain sizes

421972

5-8 mm and a layer thickness of 250 mm. Thus, a multilayer contact mass is obtained, in which the first layer consists of granular material with coalescing properties, the second of granular material with hydrophilic properties and oil, and the third - from oil.

The upper level of the liquid is maintained by a hydraulic lock through which purified water is taken. Above the first layer of granulated material at a distance of 50 I-IM, a flow distributor is placed in the form of a watering can, providing a thin-jet (with a diameter of 1–2 mg-O feed water over the entire area1; and contact mass.

The source water from the apparatus with a stirrer, in which the necessary

2Q composition and dispersion of a water-oil emulsion, with the help of a pump, is fed to a flow distributor. Water is passed through all layers of the contact mass and taken through a water seal.

25 EXAMPLE 2. Carried out analogously to example 1, but as the first layer with coalescing properties, granulated polyethylene with granule sizes of 4-6 mm is used and

3 (j, 250 km thick, and the second layer is made of aluminum – gineic chips 3-4 i-iM wide, 5–6 mm long and 1.5–2 mm thick. The chip thickness is 250 mm.

EXAMPLE 3. Similar to Example 1, the first layer is made of expanded polystyrene (expanded polystyrene) in the form of balls with a diameter of 6-3 mm, and the second is made of broken ceramics with pieces of 8-10 mm in size.

The thickness of both layers is equal to 250 mm.

The results of cleaning oily

., water in the laboratory for i-45

well-known and proposed methods

are shown in the table.

The application of the proposed method allows to increase the degree of purification of oily wastewater by petrochemicals or by 10–15% to increase the productivity of wastewater treatment plants, so that the use of the volume of wastewater treatment plants can be increased or when designing new treatment units wastewater reduce their overall dimensions and metal content.

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Hydraulic load, m / m.h

The oil content in the source water, mg / l

Oil content in

purified water

mg / l

Editor N. Dankulich

Compiled by T. Ledneva Tehred M. Khodanych

Order 3640/10 Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

production and printing company, Uzhgorod, st. Project, 4

8-10

8-10

650

650

650

4-10

3-8

4-10

Proofreader V. Booth ha

Claims (1)

METHOD FOR CLEANING OIL-CONTAINING WATER, comprising distributing the feed water stream by passing it through a layer of granular coalescing material and separating the oil by passing the stream through a liquid contact mass, characterized in that, in order to improve the cleaning efficiency, the water stream is additionally distributed before the oil is separated. by passing it through a layer of granular hydrophilic material.