Method for treating methylene blue wastewater

A methylene blue and waste water technology, which is applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of flocculant being difficult to achieve the desired effect, high treatment cost and high price, and achieve decolorization effect. Remarkable, simple treatment process, convenient operation effect

Active Publication Date: 2017-11-24
北京市畜牧业环境监测站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inorganic flocculants mainly include ferric chloride, aluminum sulfate, polyferric sulfate, etc., which have a certain effect on removing suspended solids in sewage, but have no decolorization effect on soluble dyes in water, and the dosage is large and the efficiency is low
Organic flocculants mainly include decolorizing flocculants such as polyacrylamide and chitosan, but their application is limited due to their high price, high processing cost, and the toxicity of polyacrylamide itself.
Because the water quality of high-concentration and high-color wastewater is very complicated, it is difficult to achieve the desired effect with a single flocculant. Therefore, the development of new composite decolorizing flocculants has become a research hotspot in the field of water treatment.

Method used

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  • Method for treating methylene blue wastewater
  • Method for treating methylene blue wastewater
  • Method for treating methylene blue wastewater

Examples

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Embodiment 1

[0034] A method for processing methylene blue wastewater, comprising the following steps:

[0035] (1) get the methylene blue waste water 80ml that concentration is 100mg / L and place in the beaker;

[0036](2) adding concentration to the solution that step (1) obtains earlier is that 40g / L tannic acid aqueous solution 0.3ml and concentration are 0.4ml of 15g / L magnesium sulfate aqueous solution, under room temperature, stir 30s with the rotating speed of 150r / min, mix Uniformly, the dye aqueous solution is obtained;

[0037] (3) Adjust the pH of the aqueous dye solution obtained in step (2) to 9 with a 40% sodium hydroxide (NaOH) aqueous solution, stir for 30 seconds at a speed of 150 r / min, and form stable blue granular flocculation in the solution thing;

[0038] (4) in the aqueous solution with blue granular floc that step (3) obtains again, add ferric oxide (Fe 3 o 4 ) powder 0.1g and a concentration of 920g / L ferric chloride (Fecl 3 ) aqueous solution 0.05ml, then us...

Embodiment 2

[0042] A method for processing methylene blue wastewater, comprising the following steps:

[0043] (1) Take 80ml of methylene blue aqueous solution with a concentration of 100mg / L and place it in a beaker.

[0044] (2) to the solution that step (1) obtains earlier, adding concentration is that 40g / L tannic acid aqueous solution 0.3ml and concentration are 0.4ml of 15g / L magnesium sulfate aqueous solution, under room temperature, stir 30s with the rotating speed of 200r / min, mix Uniformly, the dye aqueous solution is obtained.

[0045] (3) Regulate the pH of the aqueous dye solution obtained in step (2) to 9-10 with a 40% NaOH aqueous solution, stir at a speed of 200r / min for 30s, and form stable blue granular flocs in the solution.

[0046] (4) in the aqueous solution that step (3) obtains again, add ferric oxide (Fe 3 o 4 ) powder 0.1g and a concentration of 920g / L ferric chloride (Fecl 3 ) aqueous solution 0.05ml, then use 40% sodium hydroxide (NaOH) to adjust the pH to ...

Embodiment 3

[0057] A method for processing methylene blue wastewater, comprising the following steps:

[0058] (1) 80ml of methylene blue aqueous solution with a concentration of 50mg / L is placed in a beaker;

[0059] (2) In the solution that step (1) obtains earlier, adding concentration is that 40g / L tannic acid aqueous solution 0.3ml and concentration are 0.4ml of 15g / L magnesium sulfate aqueous solution, under room temperature, stir 30s with the rotating speed of 150-200r / min , mixed uniformly to obtain an aqueous dye solution;

[0060] (3) Adjust the pH of the aqueous dye solution obtained in step (2) to 9-10 with a 40% sodium hydroxide (NaOH) aqueous solution, stir at a speed of 150-200r / min for 30s, and form a stable blue color in the solution After granular flocs;

[0061] (4) in the aqueous solution that step (3) obtains again, add ferric oxide (Fe 3 o 4 ) powder 0.1g and a concentration of 920g / L ferric chloride (Fecl 3 ) aqueous solution of 0.05ml, and then use 40% NaOH to...

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Abstract

The invention relates to a method for treating methylene blue wastewater. The method comprises the steps of adding tannin and metal magnesium ions into the methylene blue wastewater, mixing, adding magnetic powder and a flocculating agent so as to form a magnetic flocculate under an alkali condition, and carrying out magnetic separation on the magnetic flocculate by virtue of a magnet, so as to realize the purification of the methylene blue wastewater. The method has the beneficial effects that the operation is simple, the decoloration effect is remarkable, soluble organic dyes in dye wastewater can be effectively removed, and chemical oxygen consumption in water is reduced; and the operation cost is low, the treatment cycle is short, the efficiency is high, the process is simple, no secondary pollution after flocculation, and the method is easy to popularize.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating methylene blue wastewater. Background technique [0002] Methylene blue is an important organic chemical synthetic cationic dye, which is widely used in the printing and dyeing industry. It can be used in the dyeing of hemp, silk fabrics, paper, bamboo and wood, as well as in the dyeing of biological and bacterial tissues, as well as in the manufacture of ink and Lake, etc. The wide application of methylene blue in industry has resulted in the pollution of other pure water bodies by industrial wastewater containing methylene blue. Wastewater discharged from printing and dyeing, textile, dye and other industries has the characteristics of large water volume, complex composition, high concentration of pollutants, deep color, etc., and has certain anti-oxidation and anti-biodegradation properties. source of pollution. Organic dye wastewater not only has hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/38
CPCC02F1/481C02F1/484C02F1/488C02F1/5236C02F1/54C02F1/66C02F9/00C02F2101/308C02F2101/38
Inventor 直俊强罗一鸣刘佳孙越张丽丽张加勇石奥
Owner 北京市畜牧业环境监测站
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