SU1011548A1 - Process for purifying effluents from dyeing and finishing production - Google Patents

Abstract

THE METHOD OF SEWAGE WATER PURIFICATION OF THE COLOR-FINISHING PRODUCTION OF ELECTROPHYPE EQUIPMENT WITH INSOLATED ANODES IN THE PRESENCE OF CHRONIUM AND I IONS OF THE METHOD OF THE METAL I am distinguished by the fact that Reducing the cost of electricity and electric power is carried out at pH t, O2, 5 in the presence of iron ions in the amount of 10-ZOOO mg / l. 2. The method according to p. T, o tl and h and y and with t & l that graphite is used as soluble anodes. 3. The method according to p. T, o t l and h ai-is and also with the fact that electrolysis is carried out at current density 4OO-8OO A / m.

Description

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00Isobregesh refers to wastewater treatment by means of ectropysis and can be used mainly for textile industry wastewater containing high concentrations of organic dyes and surfactants. A known method of cleaning dye waste;; production by electrolysis using titanium anodes coated with ruthenium and titanium oxides, in the presence of chlorine ions at a current density of A / m. In this process, a high discoloration effect of 93-98% t is achieved. However, the degree of purification by surfactant is only 45-5 O% and expensive anode material is used. The closest to the invention to the technical essence and is achieved by the effect is the method of wastewater treatment of dyeing and finishing production by electrolysis with insoluble anodes. In the presence of chlorine ions and ions of nepex metal, Nickel or cobalt ions are used as transition metal ions in concentrations of 20 mg. / l 2. The disadvantages of this method are incomplete purification from surfactants and the relatively high cost of nickel and cobalt salts. The aim of the invention is to increase the degree of purification of wastewater from surfactant substances and reduce the cost of the process. The goal is achieved by the fact that according to the wastewater treatment process of the dyeing and finishing production by electrolysis with insoluble anodes in the presence of chlorine ions and ions of the transition metal, iron ions are used as the latter in the amount of HFOOO mg / l and five. Graphite anodes are used as insoluble aioDs, at a current density of 4OO-8OO A / m. 1,482 The method is carried out as follows. Waste water containing organic dyes and surfactants is mixed with a solution of ferric iron, the pH is adjusted to 1.0-2.5 with hydrochloric acid. Hydrochloric acid is simultaneously used as a source of chlorins. It is possible to use sulfuric acid with the addition of sodium chloride. Next, wastewater is subjected to electrolysis in a cell with anodes of graphite at anode current density of 4OO-80O A / m. During electrolysis, deep electro-oxidation of surfactants and dyes occurs. Concentration of contaminants after purification allows additional purification of wastewater together with low concentrated wastewater by known methods. Example. In a solution of surfactant OS-2O (5OOO mg / l) and direct black dye 3 (20OO mg / l) by the addition of iron sulfate Feg (604.} the ion concentration is adjusted to 10 mg / l. The pH is adjusted to 2.5 The prepared solution is treated in an electrolyzer with graphite anodes at a density of 8OO A / m. The cleaning effect of the surfactant is 97%. Example 2. In a solution of the surfactant OC-2O 5000m ch) and an acid dye blue (20OO mg / l a) adding iron sulfate Rba. (504 the concentration of Fe ions is adjusted to ZOOO mg / l. The pH is adjusted to 2 with sulfuric acid. The prepared solution is treated in an electrolytic cell with graphite anodes at a current density of 4OO A / m 2-. In both examples, the concentration of chlorine ions is 8 g / l and a treatment time of 6O minutes. The purification effect of the surfactant is 98%. The degree of oxidation of the surfactant depending on the pTT of the solution, without a catalyst is given in table I. The initial concentration of AB is 5OOO mg / l.

In addition, the proposed pH range is necessary for efficiently} catalyst, trivalent iron ions.

The degree of oxidation of the surfactant in the aavis bridge from the solution in the presence of Fe ions with SPVA mg / l is given in Table. 2

T a b ln d a 2

The results of the comparison of the various types of catalysts proposed by Fe and the prototype N-1 and Co, as well as the effect

The nature of the catalyst on the degree of oxidation of surfactants at a pH of 2.5 SPAY 5 ppO mg / l are presented.

Table3

Claims (3)

METHOD FOR CLEANING WASTE WATER-FINISHING AND FINISHING PRO- PRODUCTION by electrolysis with insoluble anodes in the presence of chlorine ions and transition metal ions, characterized by the fact that, with a chain to increase the degree of purification of wastewater from surface-active substances and to reduce the cost of the process, electrolysis is carried out at pH 1.0- 2.5 in the presence of iron ions in an amount of 10-3000 mg / L. 2. The method according to π. 1, due to the fact that graphite anodes are used as insoluble anodes. 3. The method according to π. 1, distinguishing with the fact that electrolysis is carried out at a current density of 400-800 A / m ” ^2- . in> 1 1011548