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Process for treating alkaline malachite green wastewater on basis of coagulation sedimentation methods

A technology of coagulation sedimentation and wastewater, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc. It can solve the problem of low treatment efficiency of alkaline green wastewater and improve treatment efficiency. , The effect of improving the removal rate of lead and improving the solubility

Inactive Publication Date: 2019-05-10
河北瑞鑫化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention proposes a process based on the coagulation-sedimentation method for treating alkaline magenta wastewater, which solves the problem of low treatment efficiency of alkaline magenta wastewater in the prior art

Method used

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  • Process for treating alkaline malachite green wastewater on basis of coagulation sedimentation methods

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Embodiment 1

[0031] A kind of technology based on coagulation sedimentation method to process alkaline magenta waste water, comprises the following steps:

[0032] S0, pretreatment: filter the alkaline magenta wastewater to be treated to remove impurities in the wastewater;

[0033] S1, adding a decolorizing agent to the alkaline magenta wastewater to be treated for decolorizing treatment, the amount of the decolorizing agent added is 1 mg / L, to obtain a decolorized treatment solution;

[0034] S2. After precipitating the decolorized waste water obtained in step S1 for 30 minutes, add iron powder in an amount of 0.7 mg / L, stir under aeration conditions, stir for 1 hour, stop aeration and stirring, and let stand for 4 hours , to obtain the waste water after standing;

[0035] S3. Add an acid-base regulator to the standing wastewater obtained in step S2 to adjust the pH value of the wastewater to 6-6.5;

[0036] S4, add flocculant to the wastewater that has adjusted the pH value obtained i...

Embodiment 2

[0040] A kind of technology based on coagulation sedimentation method to process alkaline magenta waste water, comprises the following steps:

[0041] S0, pretreatment: filter the alkaline magenta wastewater to be treated to remove impurities in the wastewater;

[0042] S1, adding a decolorizing agent to the alkaline magenta wastewater to be treated for decolorizing treatment, the amount of the decolorizing agent added is 1.2 mg / L, to obtain a decolorized treatment solution;

[0043] S2, after the decolorized waste water obtained in step S1 was precipitated for 30min, iron powder was added in an amount of 1mg / L, stirred under aeration conditions, stirred for 1 hour, and the stirring speed was 120r / min, and the aeration and Stir, stand still for 5 hours, obtain the waste water after standing;

[0044] S3. Add an acid-base regulator to the standing wastewater obtained in step S2 to adjust the pH value of the wastewater to 6-6.5;

[0045] S4, adding a flocculant to the wastewat...

Embodiment 3

[0049] A kind of technology based on coagulation sedimentation method to process alkaline magenta waste water, comprises the following steps:

[0050] S0, pretreatment: filter the alkaline magenta wastewater to be treated to remove impurities in the wastewater;

[0051] S1, adding a decolorizing agent to the alkaline magenta wastewater to be treated for decolorization treatment, the addition of the decolorizing agent is 1.3mg / L to obtain a decolorized treatment solution;

[0052] S2. After precipitating the decolorized waste water obtained in step S1 for 30 minutes, add iron powder in an amount of 1.2 mg / L, stir under the condition of aeration, stir for 1 hour, and the stirring speed is 130 r / min, stop the aeration And stir, leave standstill 5 hours, obtain the waste water after standing;

[0053] S3. Add an acid-base regulator to the standing wastewater obtained in step S2 to adjust the pH value of the wastewater to 6-6.5;

[0054] S4, add flocculant to the wastewater that ...

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Abstract

The invention belongs to the technical field of wastewater treatment, and provides a process for treating alkaline malachite green wastewater on the basis of coagulation sedimentation methods. The process includes steps of S1, adding decolorizing agents into the to-be-treated alkaline malachite green wastewater and carrying out decolorization treatment to obtain decolorized treatment liquid; S2, carrying out sedimentation on the decolorized treatment liquid for 30 min, then adding iron powder into the decolorized treatment liquid, stirring the iron powder and the decolorized treatment liquid under aeration conditions for 1 hour, stopping aeration and stirring, and carrying out still standing for 4-6 hours; S3, adding acidity and alkalinity regulators into the wastewater, and adjusting thepH (potential of hydrogen) value of the wastewater until the pH value reaches 6-6.5; S4, adding flocculating agents into the wastewater, stirring the flocculating agents and the wastewater for 30-40 min and carrying out still standing sedimentation; S5, carrying out filtering, detecting filtered liquid and draining the filtered liquid after the filtered liquid is qualified by detection. The flocculating agents comprise, by weight, 10-15 parts of chitosan, 3-8 parts of polyvinylpyrrolidone, 1.5-3.5 parts of polyaluminum chloride and 0.6-1.1 parts of polyethylene oxide. The process has the advantage that the problem of low alkaline malachite green wastewater treatment efficiency in the prior art can be solved by the aid of the process.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a process for treating alkaline magenta wastewater based on a coagulation-sedimentation method. Background technique [0002] Basic magenta green, also known as basic green 4, is a kind of dye and pigment, and its molecular formula is C 23 h 25 N 2 , the molecular weight is 329.46, green with flashing crystals, soluble in water, very soluble in ethanol, all in blue-green color, adding sodium hydroxide to its aqueous solution to produce white precipitate with green light, dyeing at high temperature (120°C), The color light remains unchanged, and the light fastness of dyeing on acrylic fiber is 4-5 grades. [0003] With the development of industrial economy, alkaline product green is widely used in textile, leather, paper, rubber, plastic and food and other industrial fields, a large amount of waste water is produced in the process of alkaline product green, due to ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/38
Inventor 刘瑞明
Owner 河北瑞鑫化工有限公司
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