Flocculant for treating waste water

FIELD: chemistry.

SUBSTANCE: flocculant has the following composition, wt %: partial magnesium salt of a copolymer of acrylic and methacrylic acid neutralised by 60% (with ratio of monomers: acrylic acid - 45%, and methacrylic acid - 55%) 2.4-3.5; sodium salt of a copolymer of acrylic and methacrylic acid (with ratio of monomers: acrylic acid - 35%, and methacrylic acid 65%) 3.8-5.8; polyacrylamide 1.1-1.5; water - the balance. The flocculant is used in form of process solutions with concentration 0.015-0.035 wt %. 0.035% aqueous flocculant solutions have the highest flocculating power.

EFFECT: flocculant has high solubility in water and ensures high efficiency when used to clarify waste water.

6 ex

 

The invention relates to the flocculants used for wastewater treatment enterprises of the coal industry and production of building materials.

Known flocculant consisting of a mixture of polyvinyl alcohol (PVA concentration in this mixture is 0.25 vol.%) with aluminum chloride, the concentration of aluminum chloride in the mixture is from 8 to 9 vol.%, in terms of Al2About3) (US 4795585, MKI 02F 5/10, 1989).

This flocculant is used for wastewater treatment.

The disadvantage of this flocculant is the use of a mixture of polyvinyl alcohol with aluminium chloride.

Known flocculant obtained by the reaction of sodium polyacrylate with glycidyl-trimethylammonium (US 4808668, MKI 08F 8/30, 30/04, 1989).

The disadvantage of this flocculant is that you cannot use it for water purification.

Known flocculant based polymer diallylamine or halogen salts diallylamine and acrylamide (US 3412019, MKI 01N 55/02, 1968).

The disadvantage of this flocculant is that you cannot use it for aqueous suspensions of clay and chalk.

Known flocculant based on the polycondensation reaction of methylamine with epichlorohydrin (US 3755159, MKI SW 1/20, 1973).

Suitable for use as flocculants for wastewater treatment and water suspensions, obrazuyuscikh the processing ore, as well as hardening of paper.

The disadvantage of this flocculant is a very low rate of water clarification.

Known flocculant based muriate polyamine (US 4214214, MKI SW 1/20, 1981).

Suitable for the clarification and purification of natural waters, domestic and industrial effluents in concentrations up to 10 mg/l of suspension.

The disadvantage of this flocculant is the use of large doses.

Known flocculant based on the reaction of the technical solution of polyacrylamide with dimethylamine and formaldehyde (EN 1199761, MKI 08F 220/56, 8/28, 1985).

Used for flocculation precipitation of primary sedimentation sewage stations.

The disadvantage of this flocculant is the use of toxic amines, formaldehyde and loss of use for wastewater clarification.

Known flocculant based on polyacrylamide (US 3488720, MKI SW 1/20, 08F 3/84, 1970).

Used for wastewater treatment paper mills.

The disadvantage of this flocculant is the use of large doses.

Closest to the invention to the technical essence and the achieved result is a method of obtaining a flocculant based on polyacrylic acid (prototype).

The flocculant has the following composition, wt.%: polyacrylic acid 98, water 2 (EN 2024550, MKI 08F 120/06).

This polymer can be used as polymer clay is aqueous flocculant - precipitator slurry in alumina production.

The disadvantage of this flocculant is a low solubility due to the very high molecular weight (14-24,4) 106and polyacrylamide (3-5) 106and low efficiency when used for wastewater clarification in alumina production.

The present invention is the task of creating a flocculant having a high solubility in water (for wastewater clarification).

The problem is solved in that part of the flocculant instead of the polyacrylic acid is a mixture of three compounds on the basis of incomplete magnesium salt of the copolymer of acrylic and methacrylic acid, sodium salt of copolymer of acrylic and methacrylic acid, polyacrylamide and water in the following ratio of components in the flocculant, wt.%:

incomplete magnesium salt of the copolymer of acrylic and methacrylic acids,
neutralized by 60% (in the following ratio of monomers:
acrylic acid - 45%, and methacrylic-55%)2.4-3.5
sodium salt of copolymer of acrylic and methacrylic acids(in the following ratio of monomers:
acrylic acid - 35%, and methacrylic acid 65%)3.5-5.8
polyacrylamide1.1-1.5
waterthe rest of it.

Working solutions can have the following concentration wt.%: 0.015-0.035.

Incomplete magnesium salt of the copolymer of acrylic and methacrylic acid is a polymer of the formula:

CaHbOcSdKeNafMgg,

where and from 514 to 730;

b from 634 to 902;

from 315 up to 444;

d 2 to 3;

e from 2 to 3;

f from 98 to 141;

g 1.

Content snippets K from 2.38 $ 2.88 mol%. formula:

The content of fragments by Na from 67.08 up at 67.65% mol. formula:

The content of fragments by Mg from 0.95 to 1.36 mol%. formula:

The content of fragments of balance: 28.68 to 28.79% mol. formula:

Sodium salt of copolymer of acrylic and methacrylic acid is a polymer of the formula:

CaHbOcSdKeNaf,

where and from 182 to 224;

b from 224 to 277;

with from 109 to 133;

d=1;

e=1;

f from 37 to 45.

Content snippets K from 3.12 to 3.83. mol%. formula:

The content of fragments by Na from 70.06 to 70.17% mol. formula:

The content of fragments in residue from 26.00 to 26.72% mol. formula:

polyacrylamide brand AND 930 TU 6-02-00209912-41-94

drinking water GOST 2874-73.

Working solutions can have the following concentration, wt.%: 0.035 and 0.015.

The analysis selected in the search process known solutions showed that in science and technology there is no object, similar to the claimed combination of features and the presence of the above properties, which allows to make a conclusion on the conformity of the declared object of the criteria of "novelty" and "inventive step".

To prove compliance of the claimed invention, the criterion "industrial applicability" provide examples of specific performance.

Example 1 (the prototype)

Determination of flocculation ability carried out by the method consisting in the following: in a measuring cylinder 1 l pour suspension prepared from a mixture of 60 g of clay and 45 g of chalk and 2895 g of water and added dropwise to this suspension, 5 ml working solution of flocculant (polyacrylic acid). The working solution is prepared by dissolving 5 ml of concentrated flocculant solution in 0.5 l of distilled water.

On the measuring cylinder Ave is kleywegt strip coated with divisions to a height of 250 mm, the cylinder is covered with a lid, shake for 5 minutes and include a stopwatch.

(a) at a concentration of 0.035 wt.% the sedimentation rate of the particles reaches 2.72 mm/s, the solution is turbid;

b) at a concentration of 0.015 wt.% the sedimentation rate of particles 1.19 mm/sec, the solution is turbid, sediment loose.

Example 2 (proposed)

In the conditions of example 1, but using to determine the flocculation ability of the mixture of water-soluble components, wt.%:

incomplete magnesium salt of the copolymer of acrylic and methacrylic acids,
neutralized by 60% (in the following ratio of monomers: acrylic acid - 45%, and methacrylic - 55%)2.4
sodium salt of copolymer of acrylic and methacrylic acid (in the following ratio of monomers: acrylic acid - 35%, and methacrylic - 65%)3.8
polyacrylamide1.1
waterthe rest of it.

From the obtained aqueous solution was prepared working solutions with concentrations of 0.015 and 0.035 wt.%.

When tested working solutions obtained the following results:

(a) at a concentration of .035 wt.% the sedimentation rate of particles 3.56 mm/s, the solution is transparent, dense precipitate;

b) at a concentration of 0.015 wt.% the sedimentation rate of particles 2.17 mm/s, the solution is transparent, dense precipitate.

Example 3

In the conditions of example 2, but using to determine the flocculation ability of the mixture of water-soluble components, wt.%:

incomplete magnesium salt of the copolymer of acrylic and methacrylic acids,
neutralized by 60% (in the following ratio of monomers: acrylic acid - 45%, and methacrylic - 55%)2.8
sodium salt of copolymer of acrylic and
methacrylic acid (in the following ratio of monomers: acrylic acid - 35%, and methacrylic acid 65%)a 3.9
polyacrylamide1.3
waterthe rest of it.

When using working solutions obtained the following results:

(a) at a concentration of 0.035 wt.% the sedimentation rate of particles 3.97 mm/s, the solution is transparent, dense precipitate;

b) at a concentration of 0.015 wt.% the sedimentation rate of particles 2.66 mm/s, the solution is clear, sediment p is now.

Example 4

In the conditions of example 2, but using to determine the flocculation ability of the mixture of water-soluble components, wt.%:

incomplete magnesium salt of the copolymer of acrylic and methacrylic acids,
neutralized by 60% (in the following ratio of monomers: acrylic acid - 45%, and methacrylic acid - 55%)3.1
sodium salt of copolymer of acrylic and methacrylic acid (in the following ratio of monomers: acrylic acid - 35%, and methacrylic - 65%)4.2
polyacrylamide1.4
waterthe rest of it.

When tested working solutions obtained the following results:

(a) at a concentration of 0.035 wt.% the sedimentation rate of particles 4.28 mm/s, the solution is transparent, dense precipitate;

b) at a concentration of 0.015 wt.% the sedimentation rate of particles 2.76 mm/s, the solution is transparent, dense precipitate.

Example 5

In the conditions of example 2, but using to determine flocculosa ability of the mixture of water-soluble components, wt.%:

incomplete magnesium salt of the copolymer of acrylic and methacrylic acids,
neutralized by 60% (in the following ratio of monomers: acrylic acid - 45%, and methacrylic acid - 55%)3.4
sodium salt of copolymer of acrylic and methacrylic acid (in the following ratio of monomers: acrylic acid - 35%, and methacrylic - 65%)5.1
polyacrylamide1.42
waterthe rest of it.

When tested working solutions obtained the following results:

(a) at a concentration of 0.035 wt.% the sedimentation rate of particles 5.12 mm/s, the solution is transparent, dense precipitate;

b) at a concentration of 0.015 wt.% the sedimentation rate of particles 3.08 mm/s, the solution is transparent, dense precipitate.

Example 6

In the conditions of example 2, but using to determine the flocculation ability of the mixture of water-soluble components, wt.%:

incomplete magnesium salt of the copolymer of acrylic and methacrylic acids,
neutralized by 60% (in the following ratio of monomers: acre is ash acid - 45%, and methacrylic - 55%)3.5
sodium salt of copolymer of acrylic and methacrylic acid (in the following ratio of monomers: acrylic acid - 35%, and methacrylic - 65%)5.8
polyacrylamide1.5
waterthe rest of it.

When tested working solutions obtained the following results:

(a) at a concentration of 0.035 wt.% the sedimentation rate of particles 5.56 mm/s, the solution is transparent, dense precipitate;

b) at a concentration of 0.015 wt.% the sedimentation rate of particles of 3.17 mm/s, the solution is transparent, dense precipitate.

The highest flocculosa ability to have 0.035% aqueous solution of flocculant.

Flocculant for wastewater treatment, which includes incomplete magnesium salt of the copolymer of acrylic and methacrylic acid, neutralized by 60% (in the following ratio of monomers: acrylic acid, 45%, and methacrylic acid - 55%), sodium salt of copolymer of acrylic and methacrylic acid (in the following ratio of monomers: acrylic acid 35%, and methacrylic acid 5%), polyacrylamide and water in the following ratio of components in the flocculant, wt.%:

Nepal what I magnesium salt of the copolymer of acrylic and methacrylic acids,
neutralized by 60% (in the following ratio of monomers:
acrylic acid 45%, and methacrylic acid 55%)2.4-3.5
sodium salt of copolymer of acrylic and methacrylic acid (in the following ratio of monomers: acrylic acid 35%, and methacrylic acid 65%)3.8-5.8
polyacryamide1.1-1.5
waterrest



 

Same patents:

FIELD: chemistry.

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EFFECT: efficient and accurate batching of fluorine-containing reactant, reduced operational costs.

2 cl, 1 dwg, 2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: method involves preparation of an aqueous suspension with 0.22% content of Mg(OH)F for not more than 30 minutes, which is then fed into a diluter for not less than 20 minutes. From the diluter, Mg(OH)F solution having fluorine concentration of not more than 67 g/m3 is ejected into the common stream of treated water. Flow rate of the Mg(OH)F solution is determined based on controlling content of fluorine in the solution and in the common stream of the treated water using the formula: Qp=(Qc.s. x Cf)Df, where: Qs is the flow rate of the ejected solution, m3/h; Qc.s. if the flow rate of the common stream of the treated water; Cf is concentration of fluorine in the solution, g/m3; Df is the calculated dose of fluorine fed into the common stream, g/m3, which is determined using the formula: Df=Cf o.p. - Cf s.w., where: Cf o.p. is the standard concentration of fluorine in drinking water, g/m3; Cf s.w. is the concentration of fluorine in starting water, g/m3. The apparatus for fluorinating water has chemical feeders, a reactor, a diluter tank, an ejector at the starting water feed pipe, the suction pipe of which is connected to the pipe for feeding the solution from the diluter tank, fluorine sensors at the starting water feed pipe and after addition of the fluorine-containing solution, flowmetres and an automatic control unit, whose inputs are connected to level sensors, fluorine sensors and flowmetres, and whose outputs are connected to electric motors of mixers, chemical feeders and shut-off valves.

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SUBSTANCE: the invention is dealt with devices for purification of household and industrial sewage and intended for electrical and cavitational treatment of sewage containing a large quantity of organic compounds. The device for purification of sewage consists of a body made out of a dielectric material partitioned by diaphragms for two electrode chambers and one working chamber, that contains a filtering material. The electrode chambers have cavitational field sources installed and the working chamber is supplied with a the bubbler installed in it. The technical result consists in an increase of recuperation of the filtering material at the expense of application of a cavitational field to it, decrease of the microbiological semination, and an increase of cavitational effect on particles.

EFFECT: the invention ensures an increase of the filtering material recuperation, decreased microbiological semination and increased the cavitational effect on particles.

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FIELD: food and pharmaceutical industries; water filtration.

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6 dwg

FIELD: water-supply engineering.

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EFFECT: excluded liming procedure, preserved initial (after regeneration of filters) content of sulfate ions in sulfuric acid, reduced consumption thereof during preparation of regeneration solution, and excluded discharge of sulfate ions unto water objects.

3 cl, 2 ex

FIELD: petrochemical and food and other processing industries.

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EFFECT: the invention ensures increased efficiency of sewage purification and simultaneous realization of averaging of sewage consumption, composition and purification.

1 dwg

FIELD: water treatment.

SUBSTANCE: invention relates to removing and decomposing nitrate ions contained in water, for example in ground water or in surface waters. Process consists in passing aqueous solution through electrochemical cell containing at least one anode and at least one cathode and passing electric current between them. Surface(s) of cathode is(are) covered with layer consisted of metallic rhodium. Aqueous solution is preferably aqueous solution, which was used for regeneration of ion-exchange column.

EFFECT: enhanced electrochemical cell efficiency.

18 cl, 3 ex

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