SU1733394A1 - Composition for purifying sewage - Google Patents

Abstract

The invention relates to the physicochemical treatment of industrial wastewater, in particular, to reagents for the purification of solutions from suspended substances, oil products, paints, varnishes, fats. The aim of the invention is to increase the degree of purification and reduce the toxicity of water. This is achieved by using a composition based on aluminum chloride, metallic aluminum, which additionally contains methyl chlorosilanes of the general formula (CH3), where n 1-3, having the following ratio of components, wt.% Aluminum chloride 93.0-99.8; metallic aluminum 0.1-5.0; methylchlorosilane 0.1 to 2.0. The use of the composition for treatment of wastewater allows to increase the degree of purification in comparison with the prototype from 64.0-87.5 to 95.0-98.0% (suspended substances), on COD from 48.0-66.0 to 67, 0- 90.0%, reduce the toxicity of purified water by 2-9 times. 2 tab. (Ls

Description

The invention relates to a physicochemical treatment of industrial wastewater, in particular, reagents for the treatment of wastewater from suspended solids, oil products, paints, varnishes, fats, and can be used in the treatment of wastewater from food processing, petrochemical, and engineering industries.

The closest to the present invention is a composition based on aluminum chloride (72-80%), containing ferric chloride (20-25%) and metallic aluminum up to 3%.

The disadvantage of this composition is the low degree of purification from dissolved organics (48-66%) is quite high.

toxicity of purified water (the dilution rate for water detoxification is 18-26), secondary contamination of water with iron ions, the need for alkalization of water.

The aim of the invention is to increase the degree of wastewater treatment.

The goal is achieved by the fact that the composition for purification of industrial wastewater based on aluminum chloride and metallic aluminum additionally contains methylchlorosilanes of the formula (CH3) n Si SC-n, where n is 1-3, with the following ratio of ingredients, wt.%:

Aluminum chloride 93,0-99,8

Aluminum metal0,1-5,0

Methylchlorosilanes 0.1-2.0

Xi

with so with Ј

The proposed composition contains methylchlorosilanes of the formula: (CH3) n Si SC-n. where n is 1-3, or their mixtures in the ratio (CH3) s5: Y (CH3) 2 SiCl2: CH3SiCl3 (72-91) :( 25-8) :( 3-1) in an amount of 0.1-2.0 wt. %

Table 1 presents the results of experiments.

From Table 1 it follows that the implementation of the proposed composition allows an increase in the degree of purification of industrial wastewater by suspended substances from 64 0-87.5 to 95.0-98.0%, by COD from 48.0-66.0 to 67.0 - 90.0%, reduce the toxicity of purified water by 2-9 times.

The use of methylchlorosilanes in the proposed composition leads to the formation in its aqueous solutions in the presence of metallic aluminum, as a stimulator of the reaction, oligomeric organosilicon compounds with high flocculating activity, which probably contributes to an increase in the degree of purification and reduction of the toxicity of purified water.

Table 2 presents data justifying the quantitative composition of the ingredients.

When the content of aluminum metal in the composition is below 0.1% and methylchlorosilanes below 0.1%, the amount of oligomeric organosilicon compounds formed decreases, resulting in an increase in toxicity of purified water 2.5-3.5 times and an increase in the content of contaminants in purified water suspended solids. from 3-10 to 26-30 mg / l, i.e. 3-8 times, the value of hpks 95 15 to

180-375 mg / l, i.e. 1.5-2.0 times.

When the content of methylchlorosilanes is more than 2% and the aluminum content of metal is more than 5%, an excess of oligomeric organosilicon compounds is formed, which leads to an increase in the toxicity of the treated water by 2.7-4.0 times and an increase in the content of suspended substances in purified water from 3-6 to 34- 47 mg / l, i.e. 6-22 times, and COD values from 106-195 to 240-394 mg / l, i.e. 2 times.

The proposed composition for the treatment of industrial wastewater is a waste from the production of organosilicon compounds, but can be obtained by mixing the individual components.

The resulting composition in the form of a 2% aqueous solution is introduced into the treated wastewater with vigorous stirring, then further mixed and the resulting flakes are separated by settling.

Example 2g of a composition containing 1.982 g (99.1%) of aluminum chloride

0.008 g (0.4%) of metallic aluminum, 0.01 g (0.5%) of a mixture of methyl chlorosilanes in a ratio of (CH 3 Si (CH 3) g Si SiH 2 CH 3 Si Si Cb 72: 25: 3, dissolved in 100 ml of water and 4 ml

the obtained solution is added with stirring to 1 l of waste water containing 133 mg / l of suspended solids, 72 mg / l of petroleum products, having a COD of 488 mg / l and requiring 160-fold dilution for

0 remove toxicity. Then the oily water is stirred for 10 minutes and set aside for 30 minutes. The residual content of suspended substances is 3 mg / l, oil products 2 mg / l, COD 110 mg / l. For

5 full detoxification purified water requires three-fold dilution. The degree of purification for suspended substances is 98%, for petroleum products 97%, for COD 77.5%. Water toxicity decreases in 53

0 times.

PRI mme R 2. The process is carried out analogously to example 1. 2 g of a composition containing 1.982 g (99.1%) of aluminum chloride, 0.008 g (0.4%) of metallic aluminum and 0.01 g (0.5% )

5 trimethylchlorosilane (CH3) s Si CI, dissolved in 100 ml of water and 4 ml of the solution obtained is added to 1 liter of dye-containing waste water, with a suspended matter content of 425 mg / l, COD 725 mg / l and dilution ratio to detoxify it equal to 60. After stirring and settling for 30 minutes, the residual content of suspended solids in purified water is 7 mg / l, COD - 240 mg / l.

5 The dilution rate for complete detoxification of water is 2. The cleaning effect is 98% for suspended substances, 67% for COD. Water toxicity is reduced 30 times.

0 EXAMPLE 3. The process is carried out analogously to example 1. 2 g of a composition containing 1.982 g (99.1%) of aluminum chloride, 0.008 g (0.4%) of metallic aluminum and 0.01 g (0.5 %) dimethyldichlorosilane (CH3) 2 SiCl2, dissolved in 100 ml of water. After adding 4 ml of the resulting solution to the fat-containing waste water with a fat concentration of 4250 mg / l, COD - 13000 mg / l and dilution rate for detoxification of water, 100, stirring and settling for 30 minutes, the fat content is 90 mg / l, COD - 1240 mg / l, the dilution ratio for water detoxification is 11 Water toxicity is reduced by 9 times.

5 The degree of purification from fat is 98%, COD-90%.

Example 4. A 2g composition containing 1.86 g (93%) of aluminum chloride, 0.1 g (5%) of metallic aluminum, 0.04 g (2%) of methyl trichlorosilane CHsSiCIs, is dissolved in

100 ml of water and 4 ml of the resulting solution are added with stirring to 1 l of wastewater containing 425 mg / l of suspended solids, having a COD of 725 mg / l, and the dilution rate for detoxifying water is 60. After stirring and settling, the residual suspended matter content in purified water was 8 mg / l, COD - 195 mg / l, the dilution rate for complete detoxification of water is 3. The degree of purification by suspended matter is 98%, by COD - 73%, toxicity of waste water is reduced by 20 times.

Example 5. 2g of the composition containing 1.996 g (99.8%) of aluminum chloride, 0.002 g (0.1%) of metallic aluminum, 0.002 g (0.1%) of a mixture of methylchlorosilanes in the ratio (CH3) s (CH3) 2 51C12 : CH 3 SiClC 86: 12.5: 1.5, dissolved in 100 ml of water and 4 ml of the solution obtained were added with stirring to 1 l of waste water having the characteristic indicated in Example 4. After stirring and settling, the residual suspended matter content in purified water was 10 mg / l, COD - 215 mg / l. The dilution factor for water detoxification is 2. The degree of purification for suspended solids is 97%, for COD - 70%. Toxicity decreases 30 times.

Example 6. 2g of the composition containing 1.996 g (99.8%) of aluminum chloride, 0.002 g (0.1%) of metallic aluminum, 0.002 g (0.1%) of a mixture of methylchlorosilanes in a ratio (CH3) W3: 1 (CH3) 2 SiChiCHs SICIs 91: 8: 1 was dissolved in 100 ml of water and 4 ml of the resulting solution was added with stirring to 1 l of waste water having the characteristic indicated in Example 4. After stirring and settling, the residual suspended matter in purified water was 11 mg / l, COD - 217 mg / l. The dilution factor for water detoxification is 2. The degree of purification by suspended matter is 97%, for COD-70%. Toxicity decreases 30 times.

Example 7. 2 g of waste from the production of organosilicon compounds containing 1.982 g (99.1%) of aluminum chloride, 0.008 g (0.4%) of metallic aluminum and 0.01 g (0.5%) of a mixture of methylchlorosilanes, dissolved in 100 ml water and 4 ml of the resulting solution are added to the waste water having the characteristics of example 4. Then the waste water is stirred for

10 min and defend 30 min. Purified water contains suspended solids 5 mg / l, COD - 220 mg / l. The dilution ratio for full detoxification of water is 2. Effect

purification was 98.8% for suspended solids and 69.5% for COD. Water toxicity is reduced 30 times.

Example 2g of composition containing 1.998 g (99.9%) of aluminum chloride, 0.001 g

(0.05%) of metallic aluminum and 0.001 g (0.05%) of trimethylchlorosilane (CH3), dissolved in 100 ml of water and 4 ml of the resulting solution is added to 1 l of water with the characteristics shown in Example 4. After mixing and settling the purified water contained suspended substances of 30 mg / l, had a COD of 368 mg / l, and the dilution rate for detoxification was 6. The degree of purification by suspended substances

is 93%, COD-49%. Water toxicity is reduced by a factor of 10.

Example 9. 2g of a composition containing 1.84 g (92%) of aluminum chloride, 0.11 g (5.5%) of metallic aluminum and 0.05 g

(2.5%) trimethylchlorosilane (CH3) ssu, dissolved in 200 ml of water and 4 ml of the resulting solution is added to the waste water having the characteristics of example 4. After stirring and settling, the purified

water contains suspended solids 47 mg / l, has a COD of 394 mg / l, and the dilution ratio is 7. Degree of purification is 93.6% for suspended solids, 46.6% for COD. Water toxicity decreases 8.6 times.

The proposed composition in comparison with the known provides an increase in the degree of purification from suspended substances from 48-53 to 3-10 mg / l, i.e. 5.3-16 times, from fats - from 160 to 90 mg / l, i.e. almost 2 times, from petroleum products - from 17 to 2-3.5 mg / l, i.e. 5-8.5 times. The toxicity of water decreases by a factor of 2 to 9.

Claims (1)

Claims An inventive composition for wastewater treatment comprising aluminum chloride, aluminum metal, characterized in that, in order to increase the degree of purification, it additionally contains methyl chlorosilanes of the general formula (CH3) n Si SC-n. where n 1-3, in the following ratio, wt.%: Aluminum chloride 93.0-99.8; Metallic aluminum, 0.1-5.0; Methyl chlorosilanes 0.1-2.0. In the numerator is the indicator of water quality before cleaning, in the denominator after cleaning. In the numerator - the characteristic of water before cleaning, the denominator - after cleaning. 35