SU1662949A1 - Method for sewage purification against organic dyes - Google Patents

Abstract

The invention relates to methods for the treatment of industrial wastewater and can be used in the dyeing and finishing facilities of the textile industry. The goal is to reduce the duration of the cleaning process and the consumption of ozone. Purification is subjected to waste water containing the dye "straight my scarlet", with a color intensity of 1: 1300. Wastewater treatment is carried out by ozone treatment in the reactor, which is an apparatus divided into two chambers. Each chamber is divided by two vertical partitions into three sections with alternately arranged upper and lower overflows. At the bottom of each section are gas distributors. Wastewater is fed to the top of the first section of the first chamber. After that, the wastewater enters the upper part of the first section of the second chamber. The treated wastewater is discharged from the last section of the second chamber, and the ozone-air mixture is introduced into the second chamber in parallel into each section. The gas flow after each section of the second chamber is directed to a similar section of the first chamber. For comparison, wastewater treatment is carried out in two reactors, the total volume of which is equal to the volume of the above described reactor with a parallel supply of ozone-air mixture to each. The invention achieves a 96% bleaching effect by reducing the ozone dose from 418 to 340 mg / l and the processing time from 110 to 91 minutes. 2 tab.

Description

The invention relates to methods for the treatment of industrial wastewater, in particular to the treatment of wastewater from organic dyes, and can be used in the dyeing and finishing facilities of the textile industry.

The aim of the invention is to intensify the process of wastewater treatment.

Example 1. Waste water containing a direct dye with a color intensity of 1: 1300, with a pH value of 3-4, is subjected to purification.

Wastewater treatment is carried out by ozone treatment in the reactor, which is an apparatus divided into two chambers. Each chamber is divided by two vertical partitions into three sections with alternately arranged upper and lower overflows. At the bottom of each section are gas distributors. Wastewater is fed to the top of the first section of the first chamber; After the first chamber, wastewater also enters the upper part of the first section of the second chamber. The treated wastewater is discharged from the last section of the second chamber.

The ozone-air mixture is introduced into the second chamber in parallel to each section; the gas stream after each section of the second chamber is directed to the same section of the first chamber.

For comparison, wastewater treatment is carried out in two reactors, the total volume of which is equal to the volume of the above described reactor, with a parallel supply of ozone-air mixture to each.

The conditions of the experiments and the results obtained are presented in Table. one.

Example 2. Wastewater treatment is carried out analogously to example 1, changing the PH value.

The conditions of the experiments and the results obtained when reaching 99%

the discoloration effect is presented in table. 2

Claims (1)

As follows from the table. 1 and 2 of the data, the proposed method allows, with smaller doses of ozone and shorter processing time, to achieve the same effect as the discoloration in the pH range 2-5. DETAILED DESCRIPTION OF THE INVENTION The method of purification of wastewater from organic dyes, including ozone treatment in two stages, characterized in that, in order to reduce the process time and ozone consumption, the process is carried out at a pH of 2-5 in a sectioned reactor, with ozone being introduced in parallel into each of the latter in the course of the water sections of the second stage, followed by the flow of spent ozone in each of the sections of the first stage. Table 1 no discoloration effect is achieved. Table 2