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Treatment technology for recycling of dyeing and printing wastewater

A technology for printing and dyeing wastewater and treatment process, which is applied in textile industry wastewater treatment, water/sewage treatment, neutralization water/sewage treatment, etc. It can solve problems such as complex process flow, speed up oxidation rate, improve catalytic activity, and speed up production speed effect

Inactive Publication Date: 2018-12-21
杭州浩蓝环境工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the patent document with the application number CN 201510633893.8, the production wastewater is homogenized, pre-oxidized + iron-based flocculant and lime coagulant precipitation + pure oxygen aeration and activated carbon adsorption + contact oxidation filtration + integrated membrane separation to prepare recycled wastewater. With water, not only the process is complicated, but also the pretreatment method is pure oxygen aeration, activated carbon adsorption + contact oxidation, sufficient contact reaction time must be ensured during contact oxidation, and activated carbon adsorption is very easy to treat wastewater with a higher concentration. Saturation occurs, which poses challenges to the stability of effluent water quality

Method used

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  • Treatment technology for recycling of dyeing and printing wastewater

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Embodiment 1

[0045] The wastewater from an active printing and dyeing factory in Guangdong is treated, and the treatment process is as follows:

[0046] (1) The printing and dyeing wastewater containing reactive dyes first enters the plate heat exchanger for cooling, wherein the circulating cooling water of the plate heat exchanger is industrial water; and the cooled wastewater is filtered by a mechanical grid well and then pumped into the regulating tank to regulate its pH is 8.0;

[0047] (2) The printing and dyeing wastewater of reactive dyes enters the primary reaction pool after the pH is adjusted by the adjustment pool, and 35mg / L iron-based flocculant and 20mg / L lime coagulant are added to the primary reaction pool successively. 500s -1 Stirring for 1 min, followed by a speed gradient of 40 s -1 Stirring reaction with a duration of 20min, and filtering to obtain the supernatant;

[0048] (3) Pump the coagulation-sedimented supernatant of printing and dyeing wastewater into the hy...

Embodiment 2

[0059] The wastewater from an active printing and dyeing factory in Zhejiang is treated as follows:

[0060] (1) The printing and dyeing wastewater containing reactive dyes first enters the plate heat exchanger for cooling, wherein the circulating cooling water of the plate heat exchanger is industrial water; and the cooled wastewater is filtered by a mechanical grid well and then pumped into the regulating tank to regulate its pH is 7.8;

[0061] (2) The printing and dyeing wastewater of reactive dyes enters the primary reaction pool after the pH is adjusted by the adjustment tank, and 40mg / L iron-based flocculant and 25mg / L lime coagulant are added to the primary reaction tank successively, and the speed of medicament and printing and dyeing wastewater is first 500s -1 Stirring for 1 min, followed by a speed gradient of 40 s -1 The stirring reaction lasted for 18 minutes, and the supernatant was filtered;

[0062] (3) Pump the coagulation-sedimented supernatant of printin...

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Abstract

The invention discloses a treatment technology for recycling of dyeing and printing wastewater. The treatment technology has the advantages that the technology process is simple, and the recycling rate of wastewater is high; after precise adjusting of pH (potential of hydrogen) value, the treatment efficiency of wastewater is obviously improved; the dye is further degraded by ozone catalytic oxidation; after double physical and chemical reinforcing treatment, the removal rates of COD (chemical oxygen demand) and chroma are greatly improved. An ozone catalyst has the advantages that the preparation technology is simple, the catalyzing efficiency is high, the easiness in falling is avoided, the repeatability is realized, the removal rate of COD in the dyeing and printing wastewater can reach85% or above, and the removal rate of chroma can 92% or above.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a printing and dyeing wastewater reuse treatment process. Background technique [0002] The printing and dyeing (dyeing and finishing) industry is a necessary link in the production chain of the textile industry, and its sewage discharge accounts for more than 80% of the textile industry, ranking fourth among all industries in the country (2009). In view of the current situation of national shortage of water resources and aggravated water pollution, national and regional pollutant discharge standards are becoming increasingly strict, which poses great challenges to the development of the printing and dyeing industry. The advanced treatment and reuse of wastewater for production is an important way to control pollutant discharge and achieve sustainable development. At present, the reuse rate of printing and dyeing wastewater is the lowest among all industries, and most o...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/78B01J29/00B01J37/02B01J37/10B01J35/10C02F103/30C02F101/30
CPCC02F1/725C02F1/78C02F9/00B01J29/00B01J37/0201B01J37/10C02F2101/308C02F3/28C02F2103/30C02F1/5236C02F1/66C02F1/001B01J2229/186B01J35/61
Inventor 许凤刚沈科李光辉
Owner 杭州浩蓝环境工程技术有限公司