SU1430360A1 - Method of purifying waste water from cathionic dyns - Google Patents

Abstract

The invention relates to a method for extracting cationic dyes from wastewater and can be used to purify wastewaters from textile and paper industries, as well as chemical enterprises producing synthetic dyes. The aim of the invention is to increase the recovery of cationic dyes. To carry out the process, the wastewater is treated with ammonium molybdate in an amount of 0.05-0.5 10 mol / l and the precipitate is separated by flotation or filtration. The method allows increasing the degree of purification of wastewater from cationic dyes to 99.8%. 3 tab.

Description

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The present invention relates to methods for extracting cationic dyes from waste water and for dosing, and can be used for cleaning waste waters of textile and paper industry enterprises, as well as chemical enterprises producing synthetic dyes.

The aim of the invention is to increase the recovery rate of cationic dyes.

Example 1. Sewage water, containing 10 mg / l dye with cationic red 5G, is treated with stirring with a certain amount of a 0.05 M solution of ammonium molybdate or sodium perchlorate (according to a known method). The solution is subjected to flotation treatment for 30 minutes.

. The cleaning results are presented in table. one.

Example 2. Sewage water containing 10 mg / l of cationic blue O dye is treated analogously to example 1.

The cleaning results are presented in table. 2

Example 3. Sewage water containing 4–10 mol / l of the cationic orange dye is treated as in Example 1.

The cleaning results are presented in table. 3

As can be seen from the obtained data, the recovery rate of 98.87% for cationic orange W is achieved at

the concentration of ammonium molybdate is 0.05 10 mol / l; for cationic blue, O is the recovery rate of 98.6% at a concentration of ammonium molybdate 0.25 if 10 mol / l; for cationic red, 5J is the recovery rate of 99.3% at concentrations ammonium molybdate 0.5b. 10 mol / l.

The difference in the consumption of reagent wastewater treatment due to differences in the structure of dyes. When using ammonium molybdate in an amount of 0.05-0.510 mol / l, the degree of wastewater purification from cationic dyes reaches 99.7%.

The proposed wastewater treatment method eliminates contamination of the wastewater with toxic and biologically acidic cationic dyes and reuses the extracted dyes. Purified wastewater is colorless and can be reused in the dyeing process, which makes it possible to create environmentally friendly technology for dyeing with cationic dyes.

Claims (1)

Invention Formula A method of treating wastewater from cationic dyes, which includes treatment with a precipitating reagent and separating the resulting precipitate by flotation or filtration, characterized in that, in order to increase the degree of purification, ammonium molybdate is used as a precipitating reagent. / g The degree of extraction of the dye,% Reagent (KN4) BM07024 NaClO reagent 80.8 89.6 90.5 96.7 Table 1 NaClO reagent 4.7 24.0 56.5 75.0 Reagent concentration, С -10 mol / g 0.50 1.00 1.50 Degree of Reagent ( 0,005 0,010 0,015 0,250 0,500 1,000 1,500, 2,000 2,500 Continuation of table 1 The degree of extraction of the dye,% Reagent (NH4) eMo, Oj4 NaClO reagent 87.5 91, A 92.7 Table 2 The degree of extraction of the dye,% NaClO reagent 7,8 7.9 7.9 7.9 15.0 32.3 35.5 47.4 63.0 98.87 99.48 99.25 99.73 99.90 Table 3 36.80 81.00 96.30 98.00 98.00