Composite electrolytic bath and method for electrolyzing and decoloring pulp-making effluent

A technology for pulping waste liquid and electrolyzer, applied in the field of composite electrolyzer, can solve the problems of coagulant deactivation, high price and high processing cost, and achieve the effects of improving efficiency, convenient operation and maintenance, and simple equipment structure.

Inactive Publication Date: 2007-09-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although organic flocculants have good flocculation and decolorization effects and require a wide pH range of wastewater, they are expe

Method used

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  • Composite electrolytic bath and method for electrolyzing and decoloring pulp-making effluent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The method of the present invention is used to treat the blue eucalyptus mechanical pulp wastewater, and the wastewater quality is: chromaticity: 6490C.U. COD: 11600mg / L, BOD: 2920mg / L, SS: 1390mg / L.

[0032] (1) The waste liquid is first filtered with a slanting screen, the screen is 80 mesh; after the fiber is recovered, it enters the sump.

[0033] (2) Add hydrochloric acid to reduce the acidity of the waste liquid to a pH value of 3; precipitate for 2 hours, acid analysis of lignin occurs, and precipitate part of the chromatic pollutants and most of the suspended matter.

[0034] (3) The precipitated water body obtained in step (2) enters the composite electrolysis wastewater treatment device, and the composite micro-electrolysis wastewater treatment device effectively combines three-dimensional electrodes, electrocatalytic oxidation and micro-electrolysis technologies.

[0035] Among them, the interior of the composite electrolytic cell (7) divides the reactor into ...

Embodiment 2

[0046] Using the method of the present invention to treat poplar chemical-mechanical pulp wastewater, the wastewater quality is: chroma: 5890C.U., COD: 8600mg / L, BOD: 2120mg / L, SS: 560mg / L.

[0047] (1) The waste liquid is first filtered with a slanted screen with a screen size of 50 mesh; after fiber recovery, it enters the sump.

[0048] (2) Add hydrochloric acid to reduce the acidity of the waste liquid to a pH value of 3.5; precipitate for 1.5 hours, acid analysis of lignin occurs, and precipitate part of the chromatic pollutants and most of the suspended solids.

[0049] (3) The precipitated water body obtained in step (2) enters the composite electrolysis wastewater treatment device, and the composite micro-electrolysis wastewater treatment device effectively combines three-dimensional electrodes, electrocatalytic oxidation and micro-electrolysis technologies.

[0050] Among them, the interior of the composite electrolytic cell (7) divides the reactor into four chambers ...

Embodiment 3

[0061] Using the method of the present invention to treat poplar chemical-mechanical pulp wastewater, the wastewater quality is: chroma: 3890C.U., COD: 4600mg / L, BOD: 920mg / L, SS: 370mg / L.

[0062] (1) The waste liquid is first filtered with a slanted screen with a screen size of 50 mesh; after fiber recovery, it enters the sump.

[0063] (2) Add hydrochloric acid to reduce the acidity of the waste liquid to a pH value of 4; after 1.5 hours of precipitation, acid analysis of lignin occurs, and some chromatic pollutants and most of the suspended matter are precipitated.

[0064] (3) The precipitated water body obtained in step (2) enters the composite electrolysis wastewater treatment device, and the composite micro-electrolysis wastewater treatment device effectively combines three-dimensional electrodes, electrocatalytic oxidation and micro-electrolysis technologies. Among them, the interior of the composite electrolytic cell (7) divides the reactor into four chambers through...

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Abstract

A composite electrolyzer for the electrolytic decoloring of chemico-mechanical pulping sewage is composed of multiple unit electrolyzers formed by dividing the composite electrolyzer by bulkheads and containing the plate anode, plate cathode and filler layer consisting of electric conductive particles and inertial particles, a supporting air distributing plate, aerating tube and sludge bath. Its electrolytic decoloring method for the chemico-mechanical pulping sewage includes such steps as flitering by oblique net, regulating pH=3-3.5, depositing, filtering and decoloring in said composite electrolyzer.

Description

technical field [0001] The invention relates to a device and method for electrochemical decolorization of chemical mechanical pulping waste liquid, in particular to semi-chemical pulp waste liquid such as pine, poplar and eucalyptus, alkaline hydrogen peroxide mechanical pulp waste liquid and The invention relates to a composite electrolyzer for decolorizing the sulfonated mechanical pulp waste liquid by a composite electrolysis method and a method consistent with the electrolysis decolorization. Background technique [0002] Chemimechanical pulp is one of the advanced pulping methods integrating chemical treatment and mechanical treatment. It has many advantages such as high yield, low investment and good pulp strength. Since the 1970s abroad, the production of thermomechanical pulp and chemical thermomechanical pulp has started in South America and North America, producing newsprint, high-grade printing paper and packaging board. Due to the chemical pretreatment of chemic...

Claims

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Application Information

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IPC IPC(8): C02F1/461D21C11/00
Inventor 陈元彩何北海李友明林鹿胡志军李海明雷利荣
Owner SOUTH CHINA UNIV OF TECH
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