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Preparation method of special-purposed coagulant used for treating printing and dyeing waste water

A technology for printing and dyeing wastewater and coagulant, which is used in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of human health and living environment hazards, waste of water resources, and difficulty in meeting production and environmental protection requirements. , to achieve the effect of highlighting technological progress, good water solubility, and reducing COD

Active Publication Date: 2012-02-08
XINJIANG DELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The direct discharge of printing and dyeing wastewater has brought great harm to human health and the living environment, and at the same time caused a waste of water resources
Currently commonly used inorganic flocculants or organic flocculants can only reduce COD by 50-60% at most and chroma by about 70% when treating printing and dyeing wastewater. The pharmaceutical industry produced in the coagulant and its preparation method cannot greatly reduce harmful substances such as COD in wastewater
As the country and society pay more and more attention to environmental protection requirements and the requirements for sustainable development, traditional methods have become more and more difficult to meet the requirements of production and environmental protection. In order to overcome the above-mentioned drawbacks, the efficient coagulant developed by the present invention, It replaces the traditional method of using flocculant and coagulant aid, which not only reduces the cost but also improves the quality of environmental protection

Method used

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  • Preparation method of special-purposed coagulant used for treating printing and dyeing waste water
  • Preparation method of special-purposed coagulant used for treating printing and dyeing waste water
  • Preparation method of special-purposed coagulant used for treating printing and dyeing waste water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepare raw materials in parts by weight, take 70 parts of hydrochloric acid (solid content is 20%), 17 parts of sodium metaaluminate, 12 parts of ferrous chloride, 6 parts of aluminum potassium sulfate, 4 parts of sodium silicate, 2.5 parts of poly Allyl dimethyl ammonium chloride;

[0015] Its synthetic steps:

[0016] Sodium metaaluminate + ferrous chloride + potassium aluminum sulfate + hydrochloric acid → high polymer: the reaction condition is 130°C, stirring at constant temperature for 3 hours, then cooling down to 95°C;

[0017] High polymer + sodium silicate→inorganic high polymer: the reaction condition is 95°C, stirring at constant temperature for 1.5 hours, then cooling down to 35°C;

[0018] Inorganic high polymer + polydiallyl dimethyl ammonium chloride → mix evenly to get the finished special coagulant.

Embodiment 2

[0020] Optimum parts by weight to prepare raw materials, get 65 parts of hydrochloric acid (solid content is 20%), 15 parts of sodium metaaluminate, 10 parts of ferrous chloride, 5 parts of potassium aluminum sulfate, 3 parts of sodium silicate, 2.0 parts of poly Diallyldimethylammonium chloride;

[0021] Preparation: Add hydrochloric acid, sodium metaaluminate, ferrous chloride, and potassium aluminum sulfate into the reaction kettle in sequence, stir and heat to 135°C, react for 3 hours, and cool down to 95°C; add sodium silicate, react for 1.5 hours, and cool down to 35°C; add polydiallyl dimethyl ammonium chloride under stirring, and mix well to obtain coagulant.

[0022] Performance verification of this product: compare the use effect of polyaluminum chloride, ferric chloride and aluminum sulfate by conventional methods, and evaluate its performance as follows:

[0023] 1. Evaluation of water solubility

[0024] Add 4 kinds of medicines into 100ml of water sample respec...

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Abstract

The invention relates to a preparation method of a special-purposed coagulant used for treating printing and dyeing waste water. The coagulant is prepared from raw materials of, by weight: 60 to 70 parts of hydrochloric acid, 13 to 17 parts of sodium meta-aluminate, 8 to 12 parts of ferrous chloride, 4 to 6 parts of potassium aluminum sulfate, 2 to 4 parts of sodium silicate, and 1.5 to 2.5 parts of poly(diallyldimethylammonium chloride). Hydrochloric acid, sodium meta-aluminate, ferrous chloride, and potassium aluminum sulfate are added into a reaction vessel, and are heated to 130 to 140 DEG C while stirring; the mixture is subject to a reaction for 3 hours, and the temperature is reduced to 90 to 100 DEG C; sodium silicate is added to the mixture, the obtained mixture is subject to a reaction for 1.5 hours, and the temperature of the mixture is reduced to 30 to 40 DEG C; poly(diallyldimethylammonium chloride) is added to the mixture while stirring, and the obtained mixture is well mixed, such that the coagulant is obtained. The obtained product has good water-solubility. With the coagulant, COD in waste water can be effectively reduced, wherein a removal rate is higher than 80%. When the coagulant is used for treating printing and dyeing waste water, a color removal rate is higher than 85%. The solid content of hydrochloric acid adopted in the product is 20%.

Description

technical field [0001] The invention relates to a treatment preparation for printing and dyeing wastewater. The screened agent has strong flocculation ability and ability to remove heavy metal ions, has good water solubility, and can effectively reduce COD and chroma in water. Background technique [0002] Printing and dyeing wastewater is mainly composed of desizing wastewater, cooking wastewater, bleaching wastewater, mercerizing wastewater, dyeing wastewater and printing wastewater. It has the characteristics of high pollutant concentration, many types, toxic and harmful components, and high chroma. Generally, the pH value of printing and dyeing wastewater is 6-10, CODCr is 400-1000mg / L, BOD5 is 100-400mg / L, SS is 100-200mg / L, and the chroma is 100-400 times. However, when the printing and dyeing process, the type of fiber used and the processing technology change, the quality of wastewater will change greatly. In recent years, due to the development of chemical fiber f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/30
Inventor 魏超曾凡付田孝敬
Owner XINJIANG DELAND
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