Method of applying decolorizing agent to treat printing and dyeing wastewater

A technology for printing and dyeing sewage and decolorizing agent, which is applied in filtration treatment, multi-stage water treatment, water/sewage treatment and other directions, can solve the problems of inability to treat sewage, low efficiency, and poor decolorization effect, and achieve complete decolorization and good effect. Effect

Inactive Publication Date: 2017-12-12
张家港市双盈印染有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the decolorizing agents for sewage treatment mainly include flocculation decolorizing agents, oxidative decolorizing agents and adsorption decolorizing agents. When decolorizing sewage, most of them use a method of decolorizing sewage with different components of decolorizing agents. The effect of decolorization is not good, it is difficult to meet the decolorization standard, and some simple sewage treatment cannot be carried out during decolorization, so we need a method of using decolorant to treat printing and dyeing sewage to solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for treating printing and dyeing sewage by applying a decolorizing agent, comprising the following steps:

[0028] Step 1. Pretreatment: by setting coarse grids to intercept fine suspended solids and floating solids in the printing and dyeing wastewater, preventing fine suspended solids and floating solids from entering the decolorization tank, and performing regular aeration in the decolorizing tank;

[0029] Step 2, the preparation of alkaline solution: lime and water are mixed to obtain alkaline solution, wherein the mass ratio of lime and water is 1:100;

[0030] Step 3. Alkalization of sewage: inject alkaline solution into the decolorization tank in step 1, so that the pH value is adjusted to 9;

[0031] Step 4. Preparation of decolorizing agent: dilute the polymer flocculating decolorizing agent with 100 times of water, stir and mix, add polyacrylamide to 1000 times of water, and stir until completely dissolved;

[0032] Step 5. Decolorization: Specific ...

Embodiment 2

[0046] A method for treating printing and dyeing sewage by applying a decolorizing agent, comprising the following steps:

[0047] Step 1. Pretreatment: by setting coarse grids to intercept fine suspended solids and floating solids in the printing and dyeing wastewater, preventing fine suspended solids and floating solids from entering the decolorization tank, and performing regular aeration in the decolorizing tank;

[0048] Step 2, the preparation of alkaline solution: lime and water are mixed to obtain alkaline solution, wherein the mass ratio of lime and water is 1:100;

[0049] Step 3. Alkalization of sewage: inject alkaline solution into the decolorization tank in step 1, so that the pH value is adjusted to 11;

[0050] Step 4. Preparation of decolorizing agent: dilute the polymer flocculating decolorizing agent with 100 times of water, stir and mix, add polyacrylamide to 1000 times of water, and stir until completely dissolved;

[0051] Step 5. Decolorization: Specific...

Embodiment 3

[0065] A method for treating printing and dyeing sewage by applying a decolorizing agent, comprising the following steps:

[0066] Step 1. Pretreatment: by setting coarse grids to intercept fine suspended solids and floating solids in the printing and dyeing wastewater, preventing fine suspended solids and floating solids from entering the decolorization tank, and performing regular aeration in the decolorizing tank;

[0067] Step 2, the preparation of alkaline solution: lime and water are mixed to obtain alkaline solution, wherein the mass ratio of lime and water is 1:100;

[0068] Step 3. Alkalization of sewage: inject alkaline solution into the decolorization tank in step 1, so that the pH value is adjusted to 13;

[0069] Step 4. Preparation of decolorizing agent: dilute the polymer flocculating decolorizing agent with 100 times of water, stir and mix, add polyacrylamide to 1000 times of water, and stir until completely dissolved;

[0070] Step 5. Decolorization: Specific...

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PUM

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Abstract

The invention discloses a method of applying a decolorizing agent to treat printing and dyeing wastewater; the method comprises the steps of pretreating, to be specific, setting a thick grid to intercept fine suspended matters and floating matters in the printing and dyeing wastewater and prevent them from entering a decolorizing tank, and performing regular aerating in the decolorizing tank; preparing an alkaline liquid, to be specific, mixing lime and water in a mass ratio of 1:100 to obtain the alkaline liquid; alkalizing the wastewater, to be specific, injecting the alkaline liquid into the decolorizing tank of step I, and adjusting pH to 9-13; preparing a decolorizing agent, to be specific, using water 100 times the decolorizing agent to dilute the decolorizing agent that is a macromolecular flocculation decolorizing agent, stirring well, adding polyacrylamide into water 1000 times the polyacrylamide, and stirring until full dissolution; decolorizing; discharging wastewater, to be specific, adjusting pH of the wastewater to 6-7, and passing the wastewater through a filter outlet filled with spongy iron at certain speed so that the printing and dyeing wastewater is finally decolorized. The method of applying the decolorizing agent to treat printing and dyeing wastewater is more thorough and efficient in decolorizing the wastewater during treatment.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing sewage treatment, and in particular relates to a method for treating printing and dyeing sewage by applying a decolorizing agent. Background technique [0002] my country is a big country in the textile industry. It uses cotton, hemp and other plant fibers, wool, silk and other animal fibers, and various synthetic fibers to produce and process various textiles to supply the market. In addition to fibers, the production raw materials also include dyes, resins, surfactants, acids, alkalis and other printing and dyeing raw materials. There are many processes in the printing and dyeing process, which will produce wastewater with high organic content, high chroma and complex components, such as desizing wastewater, scouring wastewater, bleaching wastewater, mercerizing wastewater, dyeing wastewater, printing wastewater, and finishing wastewater. [0003] Printing and dyeing wastewater is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/30
CPCC02F1/001C02F1/283C02F1/56C02F1/66C02F9/00C02F2103/30C02F2301/08
Inventor 徐建龙陶国平
Owner 张家港市双盈印染有限公司
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