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Waste water treatment method

A waste water treatment and white water technology, applied in the field of papermaking, can solve the problems of limited white water system component complexity, filtration system purification degree, low sealing degree, etc., to achieve the effect of saving water consumption, reducing usage, and increasing sealing degree

Inactive Publication Date: 2019-04-05
JIANGSU LEE & MAN PAPER MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The closedness of the papermaking water circulation system currently used is not high, which is mainly limited by the complexity of the components of the white water system and the degree of purification of the filtration system. Therefore, how to effectively use the white water wastewater while reducing the adverse impact on the operation of the paper machine is an important reality. significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for treating wastewater, comprising the steps of:

[0019] Step 1. Add wet strength agent and retention aid to the papermaking sizing system, mix it evenly with the waste paper pulp, and then transport it to the press section;

[0020] Step 2. The white water released from the network pressure part is mixed with fatty alcohol defoamer and polyaluminum chloride for a period of time and then enters the multi-disc filter for filtration. The filtered white water is clear filtrate and ultra-clear filtrate, and the clarification of the clear filtrate is The clarity of ultra-clear filtrate is less than 55mg / L, and the clarity of ultra-clear filtrate is less than 35mg / L, and the filtrate is sent to the papermaking system;

[0021] Step 3, the ultra-clear filtrate is filtered through a filter membrane with a pore size of 20-500 nm to obtain a secondary ultra-clean filtrate, the clarity of which is less than 8 mg / L, and passed into the papermaking system and the vacuum s...

Embodiment 2

[0026] A method for treating wastewater, comprising the steps of:

[0027] Step 1. Add wet strength agent and retention aid to the papermaking sizing system, mix it evenly with the waste paper pulp, and then transport it to the press section;

[0028] Step 2. The white water released from the network pressure part is mixed with fatty alcohol defoamer and polyaluminum chloride for a period of time and then enters the multi-disc filter for filtration. The filtered white water is clear filtrate and ultra-clear filtrate, and the clarification of the clear filtrate is The clarity of ultra-clear filtrate is less than 55mg / L, and the clarity of ultra-clear filtrate is less than 35mg / L, and the filtrate is sent to the papermaking system;

[0029] Step 3, the ultra-clear filtrate is filtered through a filter membrane with a pore size of 20-500 nm to obtain a secondary ultra-clean filtrate, the clarity of which is less than 8 mg / L, and passed into the papermaking system and the vacuum s...

Embodiment 3

[0035] A method for treating wastewater, comprising the steps of:

[0036] Step 1. Add wet strength agent and retention aid to the papermaking sizing system, mix it evenly with the waste paper pulp, and then transport it to the press section;

[0037] Step 2. The white water released from the network pressure part is mixed with fatty alcohol defoamer and polyaluminum chloride for a period of time and then enters the multi-disc filter for filtration. The filtered white water is clear filtrate and ultra-clear filtrate, and the clarification of the clear filtrate is The clarity of ultra-clear filtrate is less than 55mg / L, and the clarity of ultra-clear filtrate is less than 35mg / L, and the filtrate is sent to the papermaking system;

[0038] Step 3, the ultra-clear filtrate is filtered through a filter membrane with a pore size of 20-500nm to obtain a secondary ultra-clean filtrate, the clarity of which is less than 8 mg / L, and passed into the papermaking system and the vacuum sy...

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Abstract

The invention relates to a waste water treatment method, including adding a wet strength agent, a filter aid and a retention aid in a paper-making sizing system, mixing the agents with waste paper pulp uniformly to obtain a mixture, delivering the mixture to a mesh press unit, dewatering by selecting a proper retention system through the mesh press unit to reduce impurity discharged into the whitewater. In the method, running parameter of a multi-disc filtering machine is controlled to increase filter cleanness of the white water, by adding of defoamers, trash catchers and the like, problemscaused by recycling of the white water are overcome, recovery closed degree of the white water is increased, usage of clean water for paper making is reduced, fiber and fillers in the white water arerecovered to the utmost extent, and emission of waste water is reduced. According to the waste water treatment method, super-clear filtrate obtained by the multi-disc filter is retreated through the membrane filter technology so that turbidity of the recycled white water is reduced; the white water discharged from the mesh press unit is treated by membrane filtration, and then replaces for clean water to be used for a high-pressure spray system and partially replaces for fresh water to be used as seal water for a vacuum system, and thus, usage of clean water is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a wastewater treatment method. Background technique [0002] For the pulp and paper industry, its water consumption is very large, and the pollution of waste water to the environment is very serious. Therefore, how to rationally utilize water resources to improve water efficiency has become a hot topic today. The closedness of the papermaking water circulation system currently used is not high, which is mainly limited by the complexity of the components of the white water system and the degree of purification of the filtration system. Therefore, how to effectively use the white water wastewater while reducing the adverse impact on the operation of the paper machine is an important reality. significance. Contents of the invention [0003] In order to solve the problems in the prior art, the invention provides a wastewater treatment method. [0004] To achieve the above ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F103/28
CPCC02F1/00C02F1/001C02F1/44C02F9/00C02F2103/28
Inventor 李文斌
Owner JIANGSU LEE & MAN PAPER MFG
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