Deep treatment method for pulping papermaking wastewater

A technology for pulping and papermaking and advanced treatment, which is applied in the direction of processing wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of high treatment cost and no large-scale promotion and application, and achieve The effect of reducing chemical consumption, reducing processing costs, and reducing production volume

Active Publication Date: 2013-07-10
SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also requires the addition of a large amount of chemical reagents, which is expensive to process
[0006] Most of the above technologies have not been widely promoted and applied due to their own problems.

Method used

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  • Deep treatment method for pulping papermaking wastewater
  • Deep treatment method for pulping papermaking wastewater
  • Deep treatment method for pulping papermaking wastewater

Examples

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Effect test

Embodiment 1

[0046] A method for advanced treatment of pulping and papermaking wastewater after secondary biochemical treatment, comprising the steps of:

[0047] ①. Pulping and papermaking wastewater after secondary biochemical treatment is added to the mixing tank, and FeSO is added to the mixing tank at a rate of 0.5mmol / L 4 The mixed reactant mixed with tetrasodium ethylenediaminetetraacetic acid in a molar ratio of 20:1, adjusted to pH 5.5 with concentrated sulfuric acid, aerated and mixed evenly, to prepare premixed wastewater;

[0048] ②. Introduce the premixed waste water prepared in step ① into the magnetization mixing reactor, add mass concentration of 27.5% hydrogen peroxide solution at multiple points according to the addition amount of 100mg / L, and magnetize it for 0.5s under the magnetization condition with a magnetic field strength of 600mT, Produce magnetized wastewater;

[0049] ③. Add the magnetized wastewater prepared in step ② into the catalytic reaction tank, adjus...

Embodiment 2

[0059] A method for advanced treatment of pulping and papermaking wastewater after secondary biochemical treatment, comprising the steps of:

[0060] ①. Pulping and papermaking wastewater after secondary biochemical treatment is added to the mixing tank, and FeSO is added to the mixing tank at a rate of 1.0mmol / L 4 The mixed reactant mixed with tetrasodium ethylenediaminetetraacetic acid in a molar ratio of 15:1, the pH value is adjusted to 5.8 with concentrated sulfuric acid, aerated and mixed evenly to obtain premixed wastewater;

[0061] ②. Introduce the premixed wastewater prepared in step ① into the magnetization mixing reactor, add hydrogen peroxide solution with a mass concentration of 27.5% at multiple points according to the addition amount of 150mg / L, and magnetize it for 0.8s under the magnetization condition of 650mT to obtain magnetization waste water;

[0062] ③. Add the magnetized wastewater prepared in step ② into the catalytic reaction tank, adjust the oxi...

Embodiment 3

[0072] A method for advanced treatment of pulping and papermaking wastewater after secondary biochemical treatment, comprising the steps of:

[0073] ①. Pulping and papermaking wastewater after secondary biochemical treatment is added to the mixing tank, and FeSO is added to the mixing tank at a rate of 1.5mmol / L 4 The mixed reactant mixed with tetrasodium ethylenediaminetetraacetic acid in a molar ratio of 10:1, adjusted to pH 6.0 with hydrochloric acid, aerated and mixed evenly, to prepare premixed wastewater;

[0074] ②. The premixed wastewater prepared in step ① is introduced into the magnetization mixing reactor, and the mass concentration of 27.5% hydrogen peroxide solution is added at multiple points according to the addition amount of 200mg / L. Under the magnetization condition of the magnetic field strength of 700mT, the magnetization is 1.0s, Produce magnetized wastewater;

[0075] ③. Add the magnetized wastewater prepared in step ② into the catalytic reaction tan...

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Abstract

The invention relates to a deep treatment method for pulping papermaking wastewater. The method includes the following steps of uniformly mixing the pulping papermaking wastewater which is subjected to two-stage biochemical treatment and ferrous salts, magnetizing, adding a hydrogen dioxide solution to adjust an oxidation reduction potential, adding an anion coagulant aid, performing static settlement, separating mud from water, adding a water purifier, adjusting potential of hydrogen (pH) value, uniformly mixing, adding the anion coagulant aid, performing the static settlement, separating mud from water to obtain a mixture, and guiding the mixture into a sand filter for filtering to achieve the deep treatment of the pulping papermaking wastewater. The method has the advantages that each processing step is adjusted, the consumption of treating reagents is smaller than that of Fenton oxidation technology, chemical oxygen demand Cr (CODCr) and chromaticity of effluent are superior to those of Fenton oxidation technology effluent, and thereby compared with prior Fenton oxidation technology, the technical scheme has wide application prospect.

Description

technical field [0001] The invention relates to an advanced treatment method for pulping and papermaking wastewater after secondary biochemical treatment, and belongs to the technical field of wastewater treatment. Background technique [0002] As we all know, the residual main pollutants of pulping and papermaking wastewater after secondary biochemical treatment are lignin and its biochemical derivatives. How to effectively remove soluble lignin substances in pulping and papermaking wastewater is the key to realize the The key to deep processing. [0003] At present, the advanced treatment technologies of pulping and papermaking wastewater mainly include flocculation air flotation or sedimentation technology, advanced oxidation technology, adsorption filtration technology, membrane filtration technology, ecological treatment technology, etc. For example, the Chinese patent document CN 102030447A (application number 201010526669.6) discloses a three-stage comprehensive phys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12C02F103/28
Inventor 刘勃洪卫郞咏梅季华东庄会栋苏颖邹晓凤
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
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