RU1834855C - Method for disinfection of sewage water containing aliphatic amines and/or their salts - Google Patents

Abstract

Usage: neutralization of wastewater containing aliphatic amino compounds and / or their salts in wastewater treatment of chemical industries containing a mixture of primary, secondary, tertiary aliphatic amino compounds and / or their salts. SUBSTANCE: wastewater containing aliphatic amino compounds and / or their salts is treated with alkali metal nitrite at 90 ° C in the presence of a metal halide in two stages. After the first processing step, the mixture is cooled to 22-25 ° C and treated with zinc dust. 1 tab.

Description

The invention relates to wastewater treatment from organic compounds and can be used for wastewater treatment. containing a mixture of primary, secondary and tertiary aliphatic amino compounds and / or their salts.

The aim of the invention is to increase the degree of wastewater treatment containing a mixture of primary, secondary and tertiary amines.

The method is carried out by treating wastewater containing aliphatic amines and / or their salts with alkali metal nitrite when heated in an acidic medium in the presence of a metal halide in two stages, after which the mixture is cooled to 22-25 ° C and treated with zinc dust.

Wastewater treatment with zinc dust after their primary treatment with alkali metal nitrite

It is carried out with the aim of reducing the nitroso groups formed in the first stage of the treatment to primary amino groups, which are subsequently removed by secondary treatment of the wastewater with alkali metal nitrite.

Carrying out wastewater treatment with zinc dust at a temperature of 22-25 ° C is associated with the need to prevent the cyclization of primary amino compounds in the presence of HCI and Zn, which occurs at higher temperatures.

Etc. and mer. Wastewater of the process-conditioning of EDE-10P anion exchange resin containing 400-600 mg / l of polyethylene polyamines and NaCl at a concentration of 25-32 g / l, having a pH of 12 acidify the HC to pH 2 and heat to a temperature 90 ° C, then a 5% alkali metal nitrite solution is added thereto in an amount of 17.0 -32 mg / L. The mixture is maintained at a temperature of 90 ° G

00

with

4 00

eaten eaten

with

until the evolution of nitrogen bubbles ceases, then it is cooled to 22-25 ° C and zinc dust is added to it at a rate of 1-1.5 g / l. Zinc dust treatment was carried out at room temperature, pH-2, for 3 hours.

After treatment with zinc dust, the mixture is heated to 90 ° C and at pH 2, the second half of a 5% solution of alkali metal nitrite is introduced into it in an amount of 14.5-27.6 mg / l, after which the mixture is kept at 90 ° C to stopping the release of nitrogen bubbles.

The mixture was then basified to pH and the Zn (OH) 2 precipitate was separated. Wherein

The degree of wastewater treatment from amines is: 97.5-98% (see table). There are no nitroso compounds in the purified eode,

Thus, the use of the proposed method in comparison with the known

allows to increase the degree of wastewater treatment from a mixture of primary, secondary and tertiary amines by 19.5-20%. and also to eliminate secondary pollution of wastewater with toxic nitroso compounds.

Claims (1)

SUMMARY OF THE INVENTION A method for neutralizing wastewater containing aliphatic amino compounds and / or their salts, comprising treating with alkali metal nitrite by heating in an acidic medium in the presence of a metal halide, characterized in that, in order to increase the degree of purification when the neutralization of wastewater containing a mixture of primary, secondary and tertiary amines, treatment with alkali metal nitrite is carried out in two stages, and after the first stage, the mixture is cooled to 20-25 ° C and treated with zinc dust.