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Method for photocatalytic advanced treatment of papermaking wastewater

A technology for advanced treatment of papermaking wastewater, applied in chemical instruments and methods, special compound water treatment, light water/sewage treatment, etc., can solve problems such as unsatisfactory removal effect, improve the quality of reused water, and improve photocatalytic degradation. ability, the effect of good photocatalytic performance

Active Publication Date: 2020-10-30
HUNAN FIRST NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing photocatalysts can photocatalytically degrade COD in papermaking wastewater, their removal effect is not ideal, and it is necessary to add other oxidants (such as H 2 o 2 ) to refer to the removal rate of COD

Method used

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  • Method for photocatalytic advanced treatment of papermaking wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of a composite photocatalyst, comprising the following steps:

[0032] (1) MnO 2 Preparation of Nanopowder

[0033] Weigh 0.4 mol of potassium permanganate powder and 0.6 mol of manganese chloride powder, dissolve them in 60 mL of deionized water to prepare solutions, put the solutions in a water bath and heat them to 90 °C, keep them warm for 3 hours, and then separate the two solutions Apply a pulsed electromagnetic field (400W, 3Hz, 90s), then pour the manganese chloride solution into the potassium permanganate solution at a constant speed and keep stirring for 3 hours. After the reaction is complete, vacuum filter the solution, and use deionized water and anhydrous Repeated washing with ethanol to remove impurity ions, put the obtained product in a drying oven at 80 °C for 14 hours to constant weight, and then fully grind it with an agate mortar to obtain MnO 2 Nano powder; the MnO 2 The particle size range of nano powder is 6nm;

[0034] (2...

Embodiment 2

[0041] A preparation method of a composite photocatalyst, comprising the following steps:

[0042] (1) MnO 2 Preparation of Nanopowder

[0043] Weigh 0.4mol of potassium permanganate powder and 0.6mol of manganese nitrate powder, dissolve them in 60mL of deionized water to prepare solutions, put the solutions in a water bath and heat them to 80°C, keep them warm for 4h, and then apply to the two solutions respectively Pulse electromagnetic field (400W, 3Hz, 90s), then pour the manganese chloride solution into the potassium permanganate solution at a constant speed and stir continuously for 1h, after the reaction is complete, vacuum filter the solution, and use deionized water and absolute ethanol Repeated cleaning to remove impurity ions, put the obtained product in a drying oven at 70 °C for 16 hours to constant weight, and then fully grind it with an agate mortar to obtain MnO 2 Nano powder; the MnO 2 The particle size range of nano powder is 12nm;

[0044] (2) MnO 2 Pr...

Embodiment 3

[0051] A preparation method of a composite photocatalyst, comprising the following steps:

[0052] (1) MnO 2 Preparation of Nanopowder

[0053] Weigh 0.4mol potassium permanganate powder and 0.6mol manganese acetate powder, dissolve them in 60mL deionized water to prepare solutions, put the solutions in a water bath and heat to 100°C, keep warm for 1h, and then apply to the two solutions respectively Pulse electromagnetic field (400W, 3Hz, 90s), then pour the manganese chloride solution into the potassium permanganate solution at a constant speed and stir continuously for 4 hours. After the reaction is complete, vacuum filter the solution, and use deionized water and absolute ethanol Repeated cleaning to remove impurity ions, put the obtained product in a drying oven at 90 °C for 12 hours to constant weight, and then fully grind it with an agate mortar to obtain MnO 2 Nanopowder; the MnO 2 The particle size range of nano powder is 8nm;

[0054] (2) MnO 2 Preparation of @M...

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Abstract

The invention discloses a method for photocatalytic advanced treatment of papermaking wastewater. The method comprises the following steps of: adding a proper amount of photocatalyst into the papermaking wastewater; irradiating with a 500W xenon lamp with the ph ranging from 3 to 8 and the initial concentration of CODCr in the papermaking wastewater being 100 to 160mg / L. The photodegradation capacity of the photocatalyst enables the CODCr degradation rate to be 95.5-97.6%. By the advanced treatment method of the photocatalytic papermaking wastewater, the quality of recycled water can be improved to enable the recycled water to meet the multi-aspect water demands of papermaking production, and the restriction of water resource shortage on the development of the papermaking industry is relieved.

Description

technical field [0001] The invention relates to the field of papermaking wastewater treatment, in particular to a photocatalytic advanced treatment method for papermaking wastewater. Background technique [0002] At present, the wastewater discharge of the pulp and paper industry has the characteristics of large total discharge, complex composition and difficult advanced treatment, and has become one of the main pollution sources of current industrial pollution discharge. Wastewater contains lignin, cellulose, various chemical agents and other refractory organic substances. Although the biological or biochemical methods used in modern papermaking wastewater treatment can remove most of the pollutants, the process is relatively complicated, and microbial solidification should be considered. The selection and cultivation of strains in the technology have high requirements on the technical level, but the COD removal rate is not high. Therefore, the research and development of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30B01J23/89C02F103/28
CPCC02F1/30B01J23/8986B01J23/002C02F2103/28C02F2305/10B01J35/39
Inventor 李必鑫何志坚
Owner HUNAN FIRST NORMAL UNIV
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