SU715500A1 - Method of dechlorinating purified waste water - Google Patents

Description

This invention relates to the elimination of active chlorine from treated wastewater disinfected with a chlorination meter, and can be used in biological wastewater treatment stages.

Water dechlorination is carried out by treatment with sulfur dioxide, sulfite, bisulfite, sodium thiosulfate, a composition based on sawdust and sulfate lignin 1.

Disadvantages are re-contamination of the effluent with sulphates and sulphites, as well as their lack of efficiency.

Dechlorination methods are also known by heating in the presence of catalyst 2 and 3.

Disadvantages are the need to replace catalysts. Re-contamination of water with metals, the duration and cost of the process associated with heating the treated water,

The closest to the present invention is the method of dechlorination of treated wastewater by treating with a chemically active filter

material - activated carbon 41.

Disadvantages are its high cost, due to the relative high cost of activated carbon, as well as the need to periodically restore the isrd of sorption capacity and pollution of wastewater.

0

The purpose of the invention is to increase the degree of dechlorination while increasing the degree of water purification.

The goal is achieved

5 in order to eliminate the excessive concentration of active chlorine from the purified wastewater that has been decontaminated by the chlorination method, water is filtered through sulfonated coal, which is a light acidic gllm coking coal grades sulfonation product. Unlike activated carbon, which is weakly FOUR14 anion exchange resin, sulfonated carbon

5 has the properties of a polyfunctional cation exchanger and in addition to carbon, hydrogen and sulfur (up to 1.5%). Sulfonate) possesses strongly reducing g; interventions IO 3 ..-; The process goes without specialo1, ..,. temperature or pressure of treated water. The advantage of the proposed method is the simplicity of the process, the low cost of sulfonated coal. compared to activated carbon, the possibility of using sulfocol without it. regeneration by chemical reagents that pollute watercourses, with a good effect of eliminating excess active chlorine. Example. Sewage water that has undergone a process of biological purification and chlorination, for the purpose of dechlorination, under normal conditions, is passed through a column filled with sulfated carbon with a height of t 40 cm at a speed of 16 m / h. After treatment, the concentration of active chlorine decreases from 1.6-2.0 mg / l to 0-0.2 mg / l. In addition, the residual water pollution, measured by COD (chemical oxygen demand), MIC {biological oxygen demand) and suspended solids, decreases. Experimental data are presented in Table.

Claims (1)

Claims The method of dechlorination of treated wastewater by treating it with a chemically active filter material, characterized in that, in order to increase the degree of dechlorination while increasing (purification method, sulfonated carbon is used as a chemically active filter material 1, USSR author's certificate No. 551259, cl. C 02 C 5/02, 1977. - i 2, USSR Author's Certificate No. 311867, class, C 01 B 11/06, 1968. 3, USSR Author's Certificate No. 309900 ,. cl. From 01 To 11/06, 1968, . 4o Klchko V.A., Apelsin I, E. Water preparation for industrial. and urban water supply. GSI M, p 1962, p. 454 (prototype).