SU1131833A1 - Method for purifying waste liquors from colloidal contaminants - Google Patents

Abstract

1. METHOD FOR CLEANING WASTE WATER FROM COLLOID POLLUTION, including flotation agent treatment with quaternary ammonium salts with alkyl "1 C / Hjs Ci3 HZT radicals characterized in that, in order to reduce flotation reagent utilization while maintaining a high degree, you can also remove the cost of the workflow by keeping the current level, you can also remove the cost of the work environment. containing a cation with a valence of 3-4. 2. The method according to p. 1, I differ by the fact that the inorganic electrolyte is introduced in an amount corresponding to a cation concentration of 10-20 mg-ion / l. (L

Description

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The invention relates to the protection of the environment from pollution by industrial waste and can be used to purify wastewater from a chemical industry, in particular, sulfur ore processing plants and coal preparation plants.

Of the total number of suspended pollutants contained in the wastewater of these enterprises, 30–40% are particles of a colloidal degree of dispersion. In addition, there are 4 h reagents in the wastewater used in the flotation enrichment of sulfur and coal. Stabilizing colloidal 1e particles, they contribute to the formation of stable colloidal solutions which are difficult to break down by known methods.

The known method of sewage treatment from suspended contaminants by clarification of water in settling ponds 1

The disadvantage of this method is the edge that the sedimentation rate of colloidal particles is not low.

A known method for the flotation treatment of industrial wastewater from colloidal contaminants is based on their preliminary coagulation with hydrolyzing inorganic coagulant, followed by flocculation of germ flakes and removal of the flocculated aggregate by flotation 23.

However, this method is characterized by a high consumption of coagulant (1001000 mg / l of water), the need to maintain an optimal pH to ensure the hydrolysis of the coagulant, the inevitability of the formation of a large amount of highly developed water treatment sludge, which in turn requires additional treatment and disposal.

The closest to the proposed technical essence and the achieved result is a method of cleaning wastewater from colloidal impurities, based on the flotation of impurities in the presence of bischetvertny ammonium compounds. The method involves the introduction into the purified water of an individual salt or mixture of salts of the general formula

G (CH5) g- (CHg) gL

SNG COOR

where I CrHis - With IS Ngt,

 halogen ion,

and subsequent flotation of contaminations at a reagent concentration of 5-60 mg / l.

The method allows the extraction of valuable components of wastewater in the form of a marketable product and eliminates the formation of waste water by-products 3.

The disadvantage of this method is the relatively high consumption of scarce reagent.

The purpose of the invention is to reduce reagent consumption while maintaining a high degree of water purification.

The goal is achieved by the fact that according to the method of wastewater purification from colloidal contaminants, including wastewater treatment with fluoride - Bis-Quaternary ammonium salts with alkyl radicals Su Cy (HNS), treatment with photoreagent is carried out in the presence of an inorganic electrolyte containing c hilf-10-x-166; -four.

The inorganic electrolyte is introduced in an amount corresponding to a cation concentration of 10–20 mg ion / l.

A distinctive feature is the existence of the dependence of the intensifying effect of inorganic polyions on the surface activity of the main photoreagent — bis-quaternary ammonium salt: the addition of inorganic polyions enhances the action of bis quaternary salts containing more than eight carbon atoms in the alkyl radical, but suppresses the flotation activity of salts with a shorter hydrocarbon chain .

Example 1. A 150 ml floatation column with a porous bottom (glass filter No. 4) with a capacity of 150 ml was poured into 100 ml of waste water containing 250 mg / l of colloidal sulfur stabilized by ammonium lignosulfonate. To the dispersion of sulfur, 15 mg / l of a symmetry bis were added. Quaternary ammonium base, having the formula CwHjxrOtNsiC j (in the form of a 5% aqueous solution) and 12 mg-ions / l AG (in the form of a 10% aqueous solution of aluminum chloride)

311318334

and at a rate of air bubbling, it is 0.5 mg / l (the degree of purification 5 per 1 cm of the stream is 99.8%),

river column sections, float for 5 minutes. The resulting foam. containing floatable particles of a particle, are separated from the treated water. The purified water is characterized by a residual content of colloidal sulfur. not exceeding 1.8 mg / l (degree of purification 99.2%), which, according to the established norms, allows it to be used in the circulating water supply of the enterprise .. .. Example 2: Provide conditions 15 is the same as B of Example 1, but instead of A, Tb is added in the form of a 10% strength aqueous solution (NOs) in the amount of 11 mg-ion / l. Residual sulfur content in water after flotation 20

To determine the boundary values of the valence of the injected cation and its quantity, experiments were performed that are identical to the examples described above. Experiments have shown that the optimum concentration of polycation of 3-4 into the treated water is 10-20 mg-ion / l. At a concentration lower or greater than the found interval, the degree of water purification. decreases. Comparative results of photoplating water purification from colloidal sulfur using bis-quaternary ammonium salts with different and alkyl radicals in the presence of additives of inorganic electrolyte and without them are presented in the table.

 From the data in the table it can be seen that the addition of inorganic Papianov, in particular cations of valence 3-4, entered in quantity. 10–20 mg-ions / l, intensification of the process of flotation water purification as with the use of individual bis-quaternary ammonium salts, and their mixtures. The consumption of phptooleagents is reduced.

5-11318336

by 35-65%. Uchatigoa that the cost of non-electrolytes allows drastically

organic salts for 2 times to reduce the cost of water purification without

The cost of organic reagents is the degradation of its quality. So, with reduced quaternary salts, the reduction in the flux reagent consumption is reduced by 50%

: the latter is due to a small cleaning cost reduced by 47%.

Claims (2)

1. METHOD FOR SEWAGE TREATMENT FROM COLLOIDAL POLLUTIONS, including treatment with flotoreagent and bismuth quaternary ammonium salts with alkyl radicals С7Н15 С | з Н'27, characterized in that, in order to reduce the consumption of flotation reagent while maintaining a high degree of purification, the photoreagent is treated with non-electrolyte in the presence of electrolyte reagent containing a cation with a valency of 3-4. 2. The method of pop. 1, I distinguish with the fact that the inorganic electrolyte is introduced in an amount corresponding _{to the} concentration of the cation S 10-20 mg-ion / l.