SU912659A1 - Method for purifying effluents from coarse-grained and colloidal impurities - Google Patents

Description

(5) METHOD FOR CLEANING WASTE WATER FROM GROBODISPERSKY The invention relates to protecting the environment from npoV contamination with human wastes and can be used to purify wastewater from chemical industry, in particular sulfur ore processing plants. Wastewater from the mills for the processing of sulfur ores contain highly dispersed sulfur, which, in the presence of stabilizers, forms colloidal solutions with high aggregate and kinetic stability, which makes their destruction and separation of impurities from water difficult. The most stable colloidal systems form 1c when wetting sulfur powder stabilized by ammonium lignosulfonate gets into the waste water. Reservoir waters from underground mining are also contaminated with colloidal sulfur stabilized by organic compounds present in the reservoir water. AND COLLOID IMPACTS -kopitel x. The closest in technical essence and the achieved result to the proposed is a method of sewage purification from coarse and colloidal impurities flotation with preliminary treatment of water with a reagent. The known method involves treating water with a coagulant FeCln ,, FeQ.S04, Al () an Dr., then a flocculant reagent, followed by flotation 2}. The disadvantages of the method are the technological complexity of the process.

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the need to maintain an optimal pH to ensure coagulant hydrolysis, a significant consumption of reagent, a long process time, and the inevitability of the formation of a highly watered sludge consisting of hydrolyzed coagulum from the extracted water impurities. The valuable components of the wastewater found in the sludge are not disposed of. The purpose of the invention is to simplify the purification process and extract valuable components from wastewater as a marketable product. This goal is achieved by purifying water by flotation with pretreatment of water with salt or a mixture of salts of bischetvertical ammonium oxide base of the general formula (ai N4cH) i 1 7Т ShlCOOK where R is C, H, 5X is a halogen. Preferably, salts are administered in an amount of 5-60 mg / l. The proposed method is carried out as follows. To a column with wastewater containing, for example, colloidal contaminants, salts of bischetvertic ammonium base are added in the form of an aqueous solution and floated at a certain speed of air sparging for a certain time. The resulting foam is separated from the water. Example. A 150 ml floatation column with a porous bottom (glass filter ff k) with a capacity of 150 ml is poured on 100 ml of waste water containing 250 mg / l of colloidal sulfur stabilized by ammonium lignosulfonate. To the water is added 30 mg / l of a bis-quartic ammonium salt having the formula, AcCl, (as a 5% aqueous solution) and at an air sparging rate of 5 by 1. The cross-sectional areas of the cololes are floated for 5 minutes. The resulting foam is separated from the treated water. Purified water contains colloidal sulfur 0.5 mg / l (purity 99.8%), which, in accordance with established standards, allows its use in the circulating water supply of the enterprise.

Claims (2)

The sulfur contained in the foam condensate is a finely dispersed colloidal powder, its properties are no different from those stabilized by ammonium lignosulfonate, which is a marketable product. To determine the effect of the length of the hydrocarbon chain and the concentration of bis-quaternary ammonium salts on the degree of extraction, as well as the possibility of using a mixture of salts, experiments were performed under conditions identical to the example. The data obtained are presented in the table. It should be noted that a sufficiently high degree of purification (96-98) is achieved using a mixture of salts (No. 5, 6). The use of the mixture is an additional advantage of the method, since in this case, the synthesis of salts does not require the separation of the initial alcohols into individual components, which reduces the cost of the product by 5-6 times. As can be seen from the above data, the proposed method simplifies the process of wastewater treatment from highly dispersed impurities, for example, from sulfur and shortens the process time by 3 times. At the same time, valuable components of wastewater, such as sulfur, are obtained in the form of a commercial product that does not require additional treatment. Purified water when used in the circulating water supply system does not impair the main indicators of the ore dressing process. Claim 1. Sewage treatment method from coarse and colloidal flotation containers with pre-treatment of water peareMtoM, which is used in order to simplify the process and extract valuable components from the sewage as a salable product, salt is used as an agent. or a mixture of salts of Bischetveotichny ammonium base of the general formula (ai N4CHi), iN4ai9) a,  ffl- COORj where R - - C ,, X is a halogen ion. 2. Method pop.1, distinguished by the fact that the salts or their mixture are administered in an amount of 5–60 mg / l. Information sources, taken into account in the examination 1, Proskurkov V.A. and Schmidt L.I. (Wastewater treatment in the chemical industry. L., Khimi, 1977, 1C, ““ bi. 2. US patent No. 3975269, CL.210- (C 02 C 5/12), 1976 (prototype).