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A method for reducing waste water in papermaking clean production

A clean production and wastewater technology, applied in the field of papermaking, can solve the problems of wasting money and resources, and achieve the effect of saving water transmission power costs, reducing processing load, and realizing the effect of clean papermaking production

Active Publication Date: 2017-07-18
江苏宁沭纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, it is a very passive way to use a lot of manpower, material resources and financial resources to deal with the so-called "pollutants", which is a waste of resources and money.

Method used

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  • A method for reducing waste water in papermaking clean production
  • A method for reducing waste water in papermaking clean production

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Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the existing clean paper production process, the general process is as follows:

[0024] The prepared pulp is prepared into paper after successively going through the processes of stock dilution, forming wire section, press section and surface sizing. A large amount of dilute white water and concentrated white water will be produced in the forming wire process, and a large amount of dilute white water will also be produced in the press part process. After the dilute white water produced in the two processes is directly mixed and concentrated, part of the input concentrated white water will enter together with the concentrated white water. The paper material dilution process is reused, part of it enters the white water filter for filtration treatment, and the remaining thin white water is first treated with sewage and discharged after reaching the standard. After the thin white water is processed by the white water filter, the turbid white wat...

Embodiment 2

[0027] The method for reducing waste water in the papermaking clean production of the present application, the technological process is as follows figure 2 As shown, the specific process is as follows:

[0028] The prepared pulp is prepared into paper after successively going through the processes of stock dilution, forming wire section, press section and surface sizing. A large amount of dilute white water and concentrated white water will be produced in the forming wire process, and a large amount of dilute white water will also be produced in the press part process. After the dilute white water produced in the two processes is directly mixed and concentrated, part of the input concentrated white water will enter together with the concentrated white water. The paper material dilution process is reused, part of it enters the white water filter for filtration, and the remaining thin white water is fed into the pulp for use after adding a softener. After the dilute white wate...

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Abstract

The invention discloses a method for reducing the generation of waste water in the clean production of papermaking. Part of the dilute white water produced in the process enters the paper stock dilution process for repeated use with concentrated white water, and part of it enters a white water filter for filtering treatment, and the remaining dilute white water is After adding softener, it is input into paper pulp for use; after dilute white water is processed by white water filter, the ultra-clear water produced enters the ultrafiltration process; the concentrated liquid produced by the ultra-filtration process is used for starch gelatinization in the surface sizing process, and the produced clear water enters directly Reverse osmosis process: The ultrapure water produced by the reverse osmosis process is used in the press section process, and at the same time, a trace amount of inorganic salt concentrate is generated as waste water for treatment. The method for reducing waste water in papermaking clean production of the present invention, by realizing water softening and purification in papermaking production process, eliminates Ca 2+ , Mg 2+ , The system accumulation of DCS realizes the clean production of papermaking and the micro treatment and discharge of papermaking wastewater.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method for reducing waste water generated in clean production of papermaking. Background technique [0002] At present, domestic and foreign papermaking clean production technologies basically adopt the above "DCS (Dissolved and Colloidal Substances, DCS for short, dissolved and colloidal substances) control + particle retention and drainage system + multi-disc white water filter" technology combination, to It is possible to increase the degree of recycling of white water. However, these methods have not achieved the expected goal. On the one hand, the accumulation of colloidal substances that aggregate into large particles is still very serious. In addition, the white water filter cannot remove the accumulation of soluble inorganic salt electrolytes. Therefore, the current papermaking system still must continuously discharge some white water and replenish fres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/02D21C9/00C02F103/28
Inventor 戴红旗陈晨毛圣陶王晶晶苏文鹏徐辉皮成忠
Owner 江苏宁沭纸业有限公司
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