Method of removing suspended particles from liquids and device for removing suspended particles from liquids

FIELD: chemistry.

SUBSTANCE: to realise the method, sludge is flocculated with finely dispersed ferromagnetic material and acidified. The flocculant used is an aqueous magnetic liquid with the following composition, wt %: iron (II) sulphate FeSO4 - 3-3.5; iron (III) sulphate Fe2(SO4)3 - 6-6.5; ammonium hydroxide NH4OH - 18-22; sodium oleate C18H33O22Na - 1.2-1.7; water - the rest. The solution is acidified to pH 7.5-8.5. The device for realising the method has a tank, inlet pipes for contaminated liquid and outlet of clarified liquid. Inside the tank there is a filtering drum screen, inside of which there is a fixed cylindrical frame, along the generatrices of which are attached permanent magnets with formation of zones which are free from these permanent magnets and are in form of a sector with angle α≈30°-60°. In the zone which is free from permanent magnets, a knife scrapper is pressed to the drum, the other end of the said scrapper of which is linked to a bin for collecting sludge. Inside the drum in the zone free from the permanent magnets, after the knife scrapper there is a pipe carrying washing liquid with sprayers. A holder is fitted in front of the pipe carrying liquid.

EFFECT: easier obtaining magnetic flocculant, possibility of continuous purification of liquid with simultaneous regeneration of the filtering element.

7 cl, 2 dwg

 

The invention relates to the field of protection of the hydrosphere, in particular to methods and devices for treatment of wastewater from suspended particles, and can be used in engineering, chemical, construction and other industries.

Known methods of wastewater purification from mechanical impurities in magnetic filters, equipped with a permanent magnet or an electromagnet, which is used to remove the fine ferromagnetic particles with sizes of 0.5-5 μm. As filter elements use the loading of ferromagnetic granules size (1-3) mm (Dagewesen, PYY, Villacin and other Engineering protection of surface waters from industrial effluents. The tutorial. M.: Higher school. 2003-344 S., p.109-110) - [1]. This method of magnetic filtration is suitable only for cleaning ferromagnetic contaminants.

The known method of purification of the electrolyte from cuttings dimensional electrochemical machining (Copyright certificate №1399032, publ. Bull. No. 20 of 30.05.88) - [2], which are flocculation of the sludge by adding to the electrolyte highly dispersed ferromagnetic material and acidification of the electrolyte to a pH of 3-4 by addition of hydrochloric, sulfuric or nitric acid.

The device for implementing the method is a tank with inlet and outlet pipes. Removing sfokusirovannogo sludge produced by the electromagnet, the detainees in the shell of stainless steel, dip it in the container.

When implementing the method as a ferromagnetic material used is iron oxide, ferrites of barium and strontium, and as flocculants used sodium carboxymethyl cellulose, sodium salt of polymethacrylic acid, carboxymethylcellulose, methylcellulose, polyvinyl alcohol, casein. Preparing an aqueous solution of flocculant, samachisa it in the water, under stirring impose a fine ferromagnetic material, and then zachisliaut this part acid to pH 3-4.

The technology complex and multi-layered. Another disadvantage consists in extraction technology flokulirovannym pollutants by immersion in a solution of electromagnetic devices. Due to this, the device is a device for periodic actions, in addition, when large amounts of the purified liquid and a significant mass of extracted sludge it is necessary to have a special mechanism for dipping, removal and transport of electromagnetic devices in the other container.

The technical result, which directed the claimed invention is to simplify purification technologies and the expansion of the range of use for continuous purification of liquids with regeneration of the filter element.

The technical result is achieved in that in the method of cleaning fluid is stay from suspended particles, navigated the flocculation of the sludge highly dispersed ferromagnetic material and acidification, what's new is that as a flocculant use aqueous ferrofluid prepared on the basis of sulphate of iron Fe(II) and Fe(III) in aqueous solution with the addition of ammonium hydroxide and sodium oleate, the components are taken in the following composition, wt.%:

ferric sulfate Fe (II) - FeSO43-3,5
ferric sulfate Fe (III) - Fe2(SO4)36-6,5
the ammonium hydroxide NH4HE18-22
the sodium oleate C18H33O22Na1,2-1,7

the rest is water.

Acidification of the solution is carried out to achieve a pH of 7.5-8.5.

In the device for cleaning liquids from suspended particles containing tank, a pipe for supplying contaminated liquid and the pipe outlet clarified liquid, what's new is that inside the tank is the filter mesh drum for rotation, which is installed inside a stationary cylindrical cage, along the forming of which is fixed permanent magnets with the formation of a zone free from these postenrichment.

The free zone of permanent magnets, is a sector with an angle of α≈30°÷60°.

To filter the mesh drum in the free zone of permanent magnets, pressed scraper blade, the other end of which is connected with the hopper cuttings.

Inside the drum in the free zone of permanent magnets in the direction of drum rotation is the pipeline wash liquid to the nozzle.

Before pipe supply of contaminated fluid inside the tank mounted reflector.

The invention is illustrated on figure 1, figure 2, where:

figure 1 - device for cleaning liquids from suspended particles.

figure 2 - device for cleaning liquids from suspended particles.

Here: 1 - tank, 2 - pipe supply of contaminated fluid; 3 - reflector; 4 - filter mesh drum; 5 - permanent magnets; 6 - blade scraper; 7 - hopper cuttings; 8 - pipeline wash liquid to the nozzle; 9 - pipe outlet clarified liquid; 10 - nodes of rotation.

Device for cleaning liquids from suspended particles is a rectangular tank with 1 pipe supply of contaminated fluid (inlet pipe) 2, in front of which the inside of the tank 1 is mounted to the reflector 3. In the tank 1 is installed filter mesh drum 4 rotatably, within which is located a stationary frame, forming to the th are permanent magnets 5 in the form of plates. Magnetic plate 5 is installed with the formation of a zone free of magnetic plates in the form of a sector with an angle of α≈30÷60. In the area of the sector α to the filter drum 4 is pressed scraper blade 6, the other end of which is connected with the hopper cuttings 7. Also in this area, sector α on the inner side of the drum 4 has a pipe 8 with the nozzle holes. The filter drum 4 is installed in the nodes of rotation 10 and is driven from an external drive (not shown).

The device operates as follows.

Liquid pre-mixed with flocculant prepared on the basis of magnetic fluid, and served in the tank 1 through the pipe for supplying contaminated liquid 2. Preparation of aqueous magnetic liquids: distilled water to prepare a solution of ferric sulfate Fe(II) - FeSO4in concentration, wt.% - 3-3,5%, ferric sulfate Fe(III) - 6-6,5%. The resulting solution was mixed with ammonium hydroxide NH4OH - 18-22% under vigorous stirring. The resulting suspension black washed several times, holding the sludge to achieve a solution pH of 7.5-8.5. The resulting mixture is subjected to magnetic treatment to obtain the magnetic flocs. The resulting mixture is filtered and the resulting thickened slurry is mixed with 1,2-1,7% sodium oleate C18H33O22Na by heating the e above 80°C. The obtained magnetic flocculant is mixed with the waste water in a ratio of 10-20% (wt.), depending on the type and concentration of suspended contaminants.

The flow of water from the pipe supply of contaminated liquid 2 falls on the reflector 3, which prevents direct contact of the liquid on the filter mesh drum 4. The liquid fills the tank 1 to a level not reaching the pipe 8 to the nozzle. Filter mesh drum 4 starts to rotate in the nodes of rotation 10 from an external actuator (not shown). The direction of rotation of the drum 4 is chosen such that the adhered layer of sludge on the drum creeps on the scraper blade 6. Under the action of pressure difference in front of the mesh drum inside the drum 4 the cleaned fluid tank 1 starts to pass through the mesh to the inside of the drum. Flokulirovannym sludge retained on the grid 5 by the action of magnetic forces generated by the magnetic plate 5. Due to the rotation of the sieve drum 4 layer adhered slurry exits from the liquid and together and raced to the rotary scraper 6 is collected in the collection hopper slurry 7. Simultaneously with the beginning of the cleaning process and the rotation of the filter mesh of the drum 4 in the pipeline washing liquid 8 starts to go wash liquid, which, dripping through a nozzle that cleans the filter mesh of the drum 5, which is immersed in fluid is here during the rotation of the drum, again included in the cleaning process. The purified liquid is continuously withdrawn through the pipe outlet clarified liquid 9.

Thus, the proposed method and the device allow to simplify the treatment technology, to expand the range of use and to perform the continuous purification of liquids with regeneration of the filter element.

1. The method of purification of liquids from suspended particles, which are flocculation sludge highly dispersed ferromagnetic material and acidification, characterized in that as a flocculant use aqueous ferrofluid prepared on the basis of sulphate of iron Fe(II) and Fe(III) in aqueous solution with the addition of ammonium hydroxide and sodium oleate, the components are taken in the following composition, wt.%:

ferric sulfate Fe (II) - FeSO43-3,5
ferric sulfate Fe (III) - Fe2(SO4)36-6,5
the ammonium hydroxide NH4OH18-22
the sodium oleate C18H33O22Na1,2-1,7
restwater.

2. The method according to claim 1, wherein the acidification is astora spend to achieve a pH of 7.5-8.5.

3. Device for cleaning liquids from suspended particles containing tank, a pipe for supplying contaminated liquid and the pipe outlet clarified liquid, characterized in that inside the tank is the filter mesh drum for rotation, which is installed inside a stationary cylindrical cage, along the forming of which is fixed permanent magnets with the formation of a zone free of these permanent magnets.

4. The device according to claim 3, characterized in that the free zone of permanent magnets, is a sector with an angle of α≈30 - 60°.

5. The device according to claim 3, wherein the filter mesh drum in the free zone of permanent magnets, pressed scraper blade, the other end of which is connected with the hopper cuttings.

6. The device according to claim 3, characterized in that the inside of the drum in the free zone of permanent magnets after knife scraper in the direction of rotation of the drum is a manifold wash liquid to the nozzle.

7. The device according to claim 3, characterized in that the front pipe supply of contaminated fluid inside the tank mounted reflector.



 

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