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Enhanced pre-treatment coagulant for printing and dyeing wastewater and preparation method of enhanced pre-treatment coagulant

A printing and dyeing wastewater and pretreatment technology, which is applied in textile industry wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of less adoption, difficulty in popularization, and complex methods of polyaluminium-ferric sulfate, and achieve production The effect of low cost, easy popularization and application, and simple preparation process

Active Publication Date: 2015-03-11
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For printing and dyeing wastewater with a COD concentration between 1000 and 4000 mg / L, the polyaluminum ferric sulfate prepared by the above-mentioned existing method is used for coagulation pretreatment of printing and dyeing wastewater. Although the COD removal rate after treatment can reach 60%, but Existing methods for preparing polyaluminium-ferric sulfate are too complicated, and are rarely used by general water purifier factories, so it is difficult to be popularized

Method used

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  • Enhanced pre-treatment coagulant for printing and dyeing wastewater and preparation method of enhanced pre-treatment coagulant
  • Enhanced pre-treatment coagulant for printing and dyeing wastewater and preparation method of enhanced pre-treatment coagulant
  • Enhanced pre-treatment coagulant for printing and dyeing wastewater and preparation method of enhanced pre-treatment coagulant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix 35 parts by weight of liquid polyferric sulfate and 5 parts by weight of solid aluminum chloride, then add 0.2 parts by weight of solid sodium chlorate, adjust the pH value to 2 to 3 with 50 parts by weight of waste acid, and obtain the coagulation of the present invention agent.

[0038] Comparing the obtained coagulant with PAC (polyaluminum chloride) and PFAS (polyaluminum ferric sulfate), and treating the same printing and dyeing wastewater under the same dosage, the treatment effect is as follows:

[0039]

[0040]

Embodiment 2

[0042] Mix 35 parts by weight of liquid polyferric sulfate and 5 parts by weight of solid aluminum chloride, then add 0.2 parts by weight of solid sodium chlorate, adjust the pH value to 2-3 with 50 parts by weight of waste acid, and obtain the present invention coagulant,

[0043] Comparing the obtained coagulant with PAC (polyaluminum chloride) and PFAS (polyaluminum ferric sulfate), and treating the same printing and dyeing wastewater under the same dosage, the treatment effect is as follows:

[0044]

Embodiment 3

[0046] Mix 45 parts by weight of liquid polyferric sulfate and 1 part by weight of solid aluminum chloride, then add 0.1 part by weight of solid sodium chlorate, adjust the pH value to 2-3 with 60 parts by weight of waste acid, and obtain the present invention coagulant.

[0047] Comparing the obtained coagulant with PAC (polyaluminum chloride) and PFAS (polyaluminum ferric sulfate), and treating the same printing and dyeing wastewater under the same dosage, the treatment effect is as follows:

[0048]

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Abstract

The invention discloses enhanced pre-treatment coagulant for printing and dyeing wastewater. The enhanced pre-treatment coagulant comprises the following raw materials in parts by weight: 35-45 parts of polymeric ferric sulfate, 1-5 parts of aluminum chloride, 0.1-0.2 parts of oxidizing agents and 50-60 parts of waste acid. The invention further discloses a preparation method of the enhanced pre-treatment coagulant for the printing and dyeing wastewater. The preparation method comprises the following steps that (1) 35-45 weight parts of liquid polymeric ferric sulfate and 1-5 weight parts of solid aluminum chloride are mixed into a solution; (2) 0.1-0.2 weight parts of the oxidizing agents are added; (3) the pH (potential of hydrogen) value of the solution is adjusted to be 2-3 through 50-60 weight parts of the waste acid, and the enhanced pre-treatment coagulant for the printing and dyeing wastewater is obtained. The preparation method of the enhanced pre-treatment coagulant for the printing and dyeing wastewater has a simpler preparation process than a traditional polymeric aluminum and iron production process, can make full use of the waste acid to adjust the acidity and a combination oxidization function of the waste acid and polymeric aluminum ferric sulfate, gives a full play to efficient treatment capacity and is convenient to use and popularize.

Description

technical field [0001] The invention relates to the technical field of environmental chemical water treatment, in particular to a coagulant for intensive pretreatment of printing and dyeing wastewater and a preparation method thereof. Background technique [0002] Coagulation is a conventional treatment method in the pretreatment of printing and dyeing wastewater. Generally, the COD concentration of printing and dyeing wastewater is between 1000 and 4000 mg / L. After coagulation pretreatment, the COD can be removed by 30 to 50%, which provides better for subsequent biochemistry. Handling conditions. [0003] Existing coagulants for printing and dyeing wastewater mainly include aluminum-based and iron-based coagulants, which are characterized by large market supply, low price, and stable treatment effect. In particular, ferrous sulfate not only has coagulation effect, but also decolorization effect. Many printing and dyeing enterprises regard it as the first choice of coagula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/72C02F1/76C02F103/30
CPCC02F1/5236C02F1/66C02F1/72C02F1/76C02F2101/308
Inventor 仝武刚梅荣武李欲如
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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