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Zero-discharge treatment process for printing and dyeing wastewater

A technology of printing and dyeing wastewater and treatment process, which is applied in textile industry wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of high biochemical cost, secondary pollution, and difficulty in meeting national discharge standards, and achieve Low cost and high water reuse rate

Active Publication Date: 2021-06-18
SHANGHAI YUKE ENVIRONMENTAL ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main treatment process is to use biochemical treatment after dilution, which is difficult to meet the national discharge standards, and biochemical water produces a large amount of organic sludge. If this part of organic sludge is not treated properly, it will cause secondary pollution.
At present, many companies are trying membrane method to reuse printing and dyeing wastewater, but the membrane method alone will still produce 10% to 30% high-concentration wastewater, and this part of wastewater is still not well treated
The existing printing and dyeing wastewater treatment process has a poor treatment effect, and secondly, it will cause secondary pollution if it is not thorough, and the biochemical cost is high

Method used

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Effect test

Embodiment 1

[0023] like figure 1 As shown, this embodiment provides a zero-discharge treatment process for printing and dyeing wastewater, including the following steps:

[0024] Step 1. The raw water of printing and dyeing wastewater enters the homogenization tank first, and then is pumped into the air flotation flocculation tank. The water produced in the air flotation flocculation tank passes through the self-cleaning filter and then enters the ceramic filter membrane. The ceramic filtered fresh water is sent to the first-level nanometer filter unit, the concentrated water filtered by ceramics is sent to the first-stage nanofiltration concentrated water tank;

[0025] Among them, a micro-nano bubble generator is installed in the air flotation flocculation tank. The material of the micro-nano bubble generator is PP. The micro-nano bubble generator can generate a large number of nano-scale tiny bubbles, and the nano-scale small bubbles can stay in water longer. Long, the air flotation e...

Embodiment 2

[0036] A certain printing and dyeing wastewater in Guangdong needs to be treated with zero discharge. The pollutant content in the wastewater before treatment: COD3522mg / L, ammonia nitrogen 11mg / L, total phosphorus 69mg / L, SS: 1175mg / L, sulfate radical 1300mg / L, chloride ion 587mg / L; It is required to be zero discharge, and the effluent is required to meet the production and reuse requirements of the factory area. TDS is less than or equal to 25mg / L.

[0037] Adopt the technique of embodiment 1, this technique comprises the following steps;

[0038] Step 1. The raw water of printing and dyeing wastewater enters the homogenization tank first, and then is pumped into the air flotation flocculation tank. The water produced in the air flotation flocculation tank passes through the self-cleaning filter and then enters the ceramic filter membrane. The ceramic filtered fresh water is sent to the first-level nanometer filter unit, the concentrated water filtered by ceramics is sent t...

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Abstract

The invention discloses a zero-discharge treatment process for printing and dyeing wastewater, which does not use biochemistry as a pretreatment step, has the advantages of low cost, no secondary pollution of organic sludge and high water reuse rate, and is suitable for wide popularization and application; the effluent quality is good, the COD removal rate of produced water is 99% or above, and the process is more stable than a biochemical process; the monovalent salt and the divalent salt obtained through evaporative crystallization are high in purity, the purity of the monovalent salt can reach 98.5% or above of first-grade refined industrial salt, and the purity of the divalent salt can reach 98% or above of second-grade first-grade products.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a zero-discharge treatment process for printing and dyeing wastewater. Background technique [0002] my country is the world's largest textile producer, and the textile industry is also an important part of my country's economy. At present, there are more than 50,000 textile factories in the country, which generate more than 10 billion tons of printing and dyeing wastewater every year. Printing and dyeing wastewater is wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, chemical fibers and their blended products. It has the characteristics of large water volume, high organic content, high alkalinity, and large water quality changes. It is one of the most difficult industrial wastewater to treat. Wastewater contains dyes, pastes, oils, acids and bases, fiber impurities, sand substances and inorganic salts. [0003] At present, ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/04C02F1/44C02F1/52C02F1/72C02F101/12C02F101/16C02F101/30C02F103/30
CPCC02F9/00C02F2103/30C02F1/52C02F1/442C02F1/72C02F1/441C02F1/04C02F2101/30C02F2101/16C02F2101/12Y02A20/131
Inventor 傅重喜张玉新邱地恒万彬
Owner SHANGHAI YUKE ENVIRONMENTAL ENG CO LTD
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