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Method for reducing wastewater generation during clean papermaking

A clean production and wastewater technology, applied in the field of papermaking, can solve the problems of wasting money and resources, and achieve the effects of saving water transmission power costs, reducing processing loads, and reducing floor space

Active Publication Date: 2015-12-30
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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  • Method for reducing wastewater generation during clean papermaking
  • Method for reducing wastewater generation during clean papermaking

Examples

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Effect test

Embodiment 1

[0023] like 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 water ...

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 wastewater generation during clean papermaking. Part of weak white water generated during production enters the paper stock dilution procedure to be reused together with enriched water, part of weak white water enters a white water filter to be filtered, and the rest of weak white water is introduced into paper pulp to be used after a softener is added; ultra-clear water generated after weak white water is treated with the white water filter enters the ultrafiltration procedure; concentrated liquor generated in the ultrafiltration procedure is used for starch dextrinization in the surface sizing procedure, and generated clear water directly enters the reverse osmosis procedure; ultrapure water generated in the reverse osmosis procedure enters the press section procedure to be used, and trace inorganic salt concentrated liquor is generated at the same time to be treated as wastewater. According to the method, water softening and purification are achieved during papermaking, system accretion of Ca2+, Mg2+ and DCS is eliminated, and clean papermaking and papermaking wastewater trace treatment and discharge are achieved.

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" process technology combination, with the greatest possible Improve the recycling degree 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 repl...

Claims

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Application Information

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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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