Preparation method of flocculent decolouring agent of printing and dying wastewater

A technology for printing and dyeing wastewater and decolorizing agent, which is applied in the textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of secondary environmental pollution, environmental impact, waste of resources, etc., and achieve COD reduction and rapid slag sedimentation. , good flocculation effect

Inactive Publication Date: 2010-06-30
江门市冠达化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In pretreatment, commonly used flocculation and decolorization agents are iron-based and aluminum-based, which have poor decolorization and flocculation effects, and may cause secondary pollution to the environment
[0004] The dicyandiamide-formaldehyde polymer decolorizer and polyaluminum chloride flocculant act synergistically, and the decolorization and flocculation effects are better, but the price of dicyandiamide-form

Method used

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  • Preparation method of flocculent decolouring agent of printing and dying wastewater
  • Preparation method of flocculent decolouring agent of printing and dying wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Add 90kg of formaldehyde, 200kg of dicyandiamide, and 100kg of ammonium chloride into the reactor, react at 50°C for 2 hours, then drop 60kg of formaldehyde into the reactor, react at 70°C for 4 hours, cool down and discharge to obtain component A;

[0018] 2) Add 4000kg of industrial waste aluminum sludge (including 240kg of alumina) to 1000kg of water and stir evenly, add 400kg of industrial hydrochloric acid, react at 70°C for 4 hours, cool down and discharge, and mature for 12 hours to obtain component B.

[0019] After mixing component A and component B, the effect of treating wastewater is as follows:

[0020]

Embodiment 2

[0022] 1) Add 240kg of formaldehyde, 400kg of dicyandiamide, and 250kg of ammonium chloride into the reactor, react at 60°C for 1 hour, then drop 60kg of formaldehyde into the reactor, react at 80°C for 2 hours, cool down to 60°C, add 50kg of urea, React for 1 hour, cool down and discharge to obtain A component;

[0023] 2) Add 4000kg of industrial waste aluminum sludge (including 400kg of alumina) to 1000kg of water and stir evenly, add 800kg of industrial hydrochloric acid, react at 80°C for 2 hours, cool down and discharge, and mature for 24 hours to obtain component B.

[0024] After mixing component A and component B, the effect of treating wastewater is as follows:

[0025]

Embodiment 3

[0027] 1) Add 300kg of formaldehyde, 400kg of dicyandiamide, and 350kg of ammonium chloride into the reaction kettle, react at 55°C for 1.5 hours, then add 200kg of formaldehyde, and react at 75°C for 3 hours; cool down to 50°C, then add 30kg of urea, and react for 1.5 hours , A component is obtained by discharging;

[0028] 2) Add 1000kg of water to 4500kg of industrial waste aluminum sludge (including 320kg of alumina) and stir evenly, add 600kg of industrial hydrochloric acid, react at 75°C for 1.5 hours, cool down and discharge, and mature for 18 hours to obtain component B.

[0029] The cost of chemicals per ton of waste water treated by the products of the above embodiments 1 to 3 is about 0.60-1.20 yuan, and 90% of the treated waste water can be reused, which greatly reduces water consumption, saves energy and protects the environment, and greatly reduces the cost of sewage treatment.

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Abstract

The invention discloses a preparation method of a flocculent decolouring agent of printing and dying wastewater. The method comprises the following steps: adding formaldehyde of 15-30 parts by weight to a reaction kettle, and then adding dicyandiamide of 20-40 parts by weight and ammonium chloride of 10-25 parts by weight thereto, heating the mixture for 1-2 hours at 50 DEG C to 60 DEG C, warming up to 70 DEG C to 80 DEG C to continuously react for 2-4h; cooling to 50 DEG C to 60 DEG C, adding urea of 0-5 parts by weight to the mixture to react for 2-4 hours to obtain a component A; mixing industrial waste alumina mud with hydrochloric acid, heating the mixture to 70 DEG C to 80 DEG C to react for 2-4 hours, and curing for 12-24 hours after cooling to obtain a component B. When in use, according to the specific ingredients of the printing and dying wastewater, the component A and the component B are mixed in a ratio of 2-3:1 and then added to the printing and dying wastewater. After the product is added to the wastewater, the effect on flocculation is good, the settling rate of dirt is rapid, the decolouring ratio is up to 95-99%, the COD (Chemical Oxygen Demand) is reduced by 80-90%, 90% of processed wastewater can be reused, and the processing cost is decreased evidently.

Description

technical field [0001] The invention relates to a preparation method of a sewage treatment agent, in particular to a preparation method of a flocculation and decolorization agent for printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater contains a variety of dyes, pastes and inorganic additives, with complex components and difficult treatment. [0003] At present, the printing and dyeing wastewater is generally pretreated first, and then treated by biochemical methods. In the pretreatment, the commonly used flocculation and decolorization agents are iron-based and aluminum-based, which have poor decolorization and flocculation effects, and may cause secondary pollution to the environment. [0004] Dicyandiamide-formaldehyde polymer decolorizer and polyaluminum chloride flocculant act synergistically, and the decolorization and flocculation effects are better, but dicyandiamide-formaldehyde polymer is expensive, which leads to an increa...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/30
Inventor 袁平
Owner 江门市冠达化工科技有限公司
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