Method for treating printing and dyeing wastewater

A technology for printing and dyeing wastewater and treatment methods, which is applied in textile industry wastewater treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as poor treatment effect, and achieve the effect of solving high treatment costs

Inactive Publication Date: 2009-09-16
DONGGUAN TEXWINCA HLDG
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Problems solved by technology

However, the biochemical method can only remove biodegradable organic matter, and the treatment effect on wastewater containing refractory organic matter is often not good.

Method used

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  • Method for treating printing and dyeing wastewater

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Embodiment 1

[0028] at 10,000 m 3 Take the treatment of printing and dyeing wastewater per day as an example, using ozone and biochemical combined process for treatment:

[0029] The printing and dyeing wastewater (40°C-45°C) in the workshop is first pre-regulated by the pretreatment system, the water temperature of the printing and dyeing wastewater can be reduced to about 30°C-35°C, the pH is adjusted to 8-9, and the water volume is adjusted to 42m 3 / Hour.

[0030]The printing and dyeing wastewater regulated by the pretreatment system enters the pretreatment pool 4, and some reducing substances that are easier to be oxidized are first oxidized. In the pretreatment tank 4, the dosage of ozone is 10g / m 3 Wastewater, the contact time is about 20 minutes, the ozone gas is in reverse contact with the printing and dyeing wastewater, the biodegradability of the treated printing and dyeing wastewater is increased to about 0.4 (about 0.23 before ozone oxidation treatment), and the chroma of th...

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Abstract

A method for treating printing and dyeing wastewater belongs to the technical field of treatment of printing and dyeing wastewater, comprising the following steps: 1. the temperature, quantity and pH value of the printing and dyeing wastewater are adjusted by a pre-adjusting system in advance; 2. the printing and dyeing wastewater is oxidized in an ozone oxidization system; ozone is pumped into the ozone oxidization system; partial macromolecular organic matters in the printing and dyeing wastewater are treated by the processes of ring opening and bond breaking; 3. the printing and dyeing wastewater undergoes biochemical treatment in a biochemical treatment system and the processes of hydrolysis, acidification, degradation and precipitation after undergoing micro-organism treatment; 4. the printing and dyeing wastewater flows into an oxidization decolorization system and chlorine and ozone are pumped into the oxidization decolorization system to complete oxidization decolorization; 5. the treated printing and dyeing wastewater is drained after reaching the standards. The method combines the advantages of the ozone oxidization method and biochemical method and combines the two method for treatment of the printing and dyeing wastewater, thus not only improving the effluent quality but also attaining the aim of energy saving.

Description

Technical field: [0001] The invention belongs to the technical field of printing and dyeing wastewater treatment, and in particular relates to a method for treating printing and dyeing wastewater. Background technique: [0002] At present, printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, deep chroma, high alkalinity, and large changes in water quality. Moreover, there are various types of dyes used, and they are developing in the direction of anti-biological oxidation, which makes the treatment of printing and dyeing wastewater more difficult. bigger and bigger. Now the main treatment methods are ozone oxidation or biochemical method. As an advanced oxidation technology, ozone oxidation mainly utilizes the strong oxidizing properties of ozone, and ozone can decompose itself in a short period of time in water without secondary pollution. Ozone not only has a strong sterilizing effect, but also can use ozone to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/78C02F1/76C02F3/30C02F103/30
Inventor 郭锦标
Owner DONGGUAN TEXWINCA HLDG
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