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Papermaking middle-stage wastewater decolorization method

A technology for waste water and waste water in the middle of papermaking, which is applied in the fields of energy waste water treatment, chemical instruments and methods, neutralization water/sewage treatment, etc. It can solve problems such as hindering the growth and reproduction of aquatic organisms, deep waste water, and affecting the beauty of receiving water bodies.

Active Publication Date: 2021-02-09
浙江凯宝华新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for decolorizing the middle stage of papermaking wastewater, which has the advantages of multiple decolorization, and solves the problem that although the middle stage wastewater treated by the prior art has reached the discharge standard, the discharged wastewater still presents a very deep color. Seriously affect the beauty of the receiving water body, especially seriously affect the transmission of sunlight and hinder the growth and reproduction of aquatic organisms

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for decolorizing waste water in the middle stage of papermaking, comprising the following steps:

[0027] Step 1: Flocculation: add flocculant to the wastewater, and after the flocculant diffuses in the wastewater, use a stirring device to fully mix the flocculant with the wastewater; the flocculant is polyaluminum chloride, and the amount of polyaluminum chloride added is 800mg / L, after adding the flocculant, the stirring should be fast first and then slow;

[0028] Step 2: Separation: Through the electrochemical process of compressing the electric double layer on the surface of the microparticles, the suspended solids, colloids and other flocculated substances in the wastewater are condensed into "floccules", and then solid-liquid separation is carried out after sedimentation to remove flocculation group;

[0029] Step 3: Oxidation: first adjust the pH value of the wastewater after solid-liquid separation to about 4.0, add bleaching powder and react for 90 ...

Embodiment 2

[0033] A method for decolorizing waste water in the middle stage of papermaking, comprising the following steps:

[0034] Step 1: Flocculation: add flocculant to the wastewater, and after the flocculant diffuses in the wastewater, use a stirring device to fully mix the flocculant with the wastewater; the flocculant is polyaluminum chloride, and the amount of polyaluminum chloride added is 800mg / L, after adding the flocculant, the stirring should be fast first and then slow;

[0035] Step 2: Separation: Through the electrochemical process of compressing the electric double layer on the surface of the microparticles, the suspended solids, colloids and other flocculated substances in the wastewater are condensed into "floccules", and then solid-liquid separation is carried out after sedimentation to remove flocculation It can also be used to reduce the interface Zeta potential electrochemical process, as well as physical and chemical processes such as bridging, netting, adsorpti...

Embodiment 3

[0040] A method for decolorizing waste water in the middle stage of papermaking, comprising the following steps:

[0041] Step 1: Flocculation: add flocculant to the wastewater, and after the flocculant diffuses in the wastewater, use a stirring device to fully mix the flocculant with the wastewater; the flocculant is polyaluminum chloride, and the amount of polyaluminum chloride added is 800mg / L, after adding the flocculant, the stirring should be fast first and then slow;

[0042] Step 2: Separation: Through the electrochemical process of compressing the electric double layer on the surface of the microparticles, the suspended solids, colloids and other flocculated substances in the wastewater are condensed into "floccules", and then solid-liquid separation is carried out after sedimentation to remove flocculation It can also be used to reduce the interface Zeta potential electrochemical process, as well as physical and chemical processes such as bridging, netting, adsorpti...

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PUM

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Abstract

The invention discloses a papermaking middle-stage wastewater decolorization method which comprises the following steps: flocculation: adding a flocculating agent into wastewater, and fully mixing theflocculating agent with the wastewater by using a stirring appliance after the flocculating agent diffuses in the wastewater; separation: condensing suspended matters, colloids and other flocculablesubstances in the wastewater into floccules through an electrochemical process of compressing double electric layers on the surfaces of micro-particles; according to the invention, the papermaking middle-stage wastewater is decolorized by adopting three modes of flocculation, oxidation and adsorption, so that the problems that although the middle-stage wastewater treated by the prior art reaches the discharge standard, the discharged wastewater still presents a very deep color, the attractiveness of an accepted water body is seriously influenced, solar light penetration is severely influenced,aquatic organism growth and reproduction are influenced are solved. The decolorization method is efficient and cheap, and various methods are used for treatment, so that the chromaticity of middle-stage wastewater is completely reduced, and up-to-standard discharge with indexes such as SS, COD, BOD, chromaticity and the like reaching standards is realized.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for decolorizing wastewater in the middle stage of papermaking. Background technique [0002] The harm caused by the large amount of wastewater produced by the pulp and paper industry to the human environment has aroused widespread concern in the world. With the strengthening of environmental protection legislation in various countries around the world, the discharge standards of various pollutants are becoming more and more stringent, forcing factories to protect the environment. In order to survive and build wastewater treatment systems one after another, the wastewater treatment projects of most pulp and paper mills in my country are limited to the primary treatment and secondary treatment stages, but most of the colored lignin derivatives in wastewater are difficult to be treated by ordinary active pollutants. The microorganisms in the mud degrade and deco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/28
CPCC02F9/00C02F1/5236C02F1/463C02F1/66C02F1/76C02F1/283C02F1/38C02F1/722C02F2103/28Y02W10/37
Inventor 傅贤阳赖志红赖秋明
Owner 浙江凯宝华新材料有限公司