A kind of white water treatment flocculant and using method thereof

A technology of flocculant and white water, which is applied in processing process wastewater treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the complicated process of chemical flocculant treatment, obstacles in papermaking system, and dehydration of wire part Load increase and other problems, to achieve the effect of easy control of the amount added, uniform flocculant composition, and reduced content of particulate impurities

Inactive Publication Date: 2017-12-05
DONGGUAN NINE DRAGONS PAPER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in paper mills that use 100% recycled waste paper as raw materials, due to the closed operation of the white water system, there will be a large amount of ash, stickies, and fine fibers in the white water system after paper dehydration. After treatment, the harmful substances accumulated in the system will greatly increase, resulting in a decline in water quality, foam, sludge, and PH out of control in the papermaking system, which will bring a series of papermaking obstacles to the papermaking system, resulting in an increase in the dehydration load of the wire section of the paper machine , seriously affecting the operating efficiency of the paper machine
[0004] In the existing white water purification treatment technology, the purpose of purifying white water is generally achieved by adding flocculants to the air flotation tank to promote the floating of impurities in the white water. However, this treatment method requires the use of a large amount of chemical flocculants, which not only costs the flocculants High, the follow-up treatment process of chemical flocculants remaining in white water is also relatively complicated, and the cost of purification treatment is relatively high

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  • A kind of white water treatment flocculant and using method thereof

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Effect test

Embodiment 1

[0028] A flocculant for white water treatment, the flocculant includes raw soybean milk. The solid content of soybean active ingredients in raw soybean milk per liter of the flocculant is 0.5 g, and the balance is water.

[0029] A method for using a flocculant for white water treatment, comprising the following steps: step A, tailings white water purification and recovery pretreatment, to obtain pretreated white water for use as a standby; step B, performing dissolved air treatment on clarified white water, and completely clarifying by dissolved air treatment The white water is placed in the air-dissolving tank for standby; Step C, the pretreated white water obtained in step A and the clarified white water in the dissolving tank are added to the air flotation tank, and flocculant is added to the white water inlet of the air flotation tank at the same time; Step D, Scrape off the floating pollutants that float up to the water surface of the air flotation tank, and the qualifie...

Embodiment 2

[0040] The difference between this embodiment and embodiment 1 is:

[0041] A flocculant for white water treatment, the flocculant includes raw soybean milk. Each liter of the flocculant also includes 0.1 g of calcium chloride, 0.05 g of polyaluminum chloride, and 1 mg of polyacrylamide. The solid content of soybean active ingredients in soybean milk per liter of the flocculant is 2 g, and the balance is water.

[0042] The mass percentage of the solid content of the pretreated white water measured in this embodiment is 0.25%.

[0043] The equipment for the dissolved air treatment in the step B is a dissolved air pump, and the dissolved air pressure of the dissolved air pump is 55 psi.

[0044] The volume ratio of the clarified white water added to the air flotation tank in the step C to the pretreated white water is 12:100.

[0045] The control standard of the amount of flocculant added in the step C is the weight of soybean active ingredients added per liter of pretreated ...

Embodiment 3

[0049] The difference between this embodiment and embodiment 1 is:

[0050] A flocculant for white water treatment, the flocculant includes raw soybean milk. Each liter of the flocculant also includes 0.3g of calcium chloride, 0.1g of polyaluminum chloride, and 2mg of polyacrylamide. The solid content of soybean active ingredients in soybean milk per liter of the flocculant is 3g, and the balance is water.

[0051] The mass percentage of the solid content of the pretreated white water measured in this embodiment is 0.3%.

[0052] The equipment for the dissolved air treatment in the step B is a dissolved air pump, and the dissolved air pressure of the dissolved air pump is 60 psi.

[0053] The volume ratio of the clarified white water added to the air flotation tank in the step C to the pretreated white water is 15:100.

[0054] The control standard of the amount of flocculant added in the step C is the weight of soybean active ingredients added per liter of pretreated white ...

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Abstract

The invention relates to the technical field of clean papermaking production, in particular to a flocculant for white water treatment and its use method. The flocculant for white water treatment includes raw soybean milk, and the flocculant has excellent white water purification performance and low cost; the flocculant for white water treatment The method of use comprises the following steps: step A, tailings white water purification and recovery pretreatment to obtain pretreated white water for standby; step B, performing dissolved air treatment on clarified white water, and placing the clarified white water completely dissolved in air in a dissolved air tank , for standby; step C, adding the pretreated white water obtained in step A and the clarified white water in the air-dissolving tank together in the air flotation tank, and simultaneously adding flocculant to the white water inlet of the air flotation tank; Scraping of floating pollutants, the use method has simple process, easy control of process conditions, easy control of the amount of flocculant added, strong operability, good repeatability, good purification effect, and high purification efficiency.

Description

technical field [0001] The invention relates to the technical field of papermaking clean production, in particular to a flocculant for white water treatment and a use method thereof. Background technique [0002] Papermaking white water refers to the dehydration products of the wire section, press section, and vacuum system during the papermaking process, and contains a large amount of soluble colloidal substances such as ash, stickies, and fine fibers. The discharge of water in papermaking production is very large. If it is not treated for reuse and discharged directly, it will not only pollute the environment, but also waste water resources. [0003] Cleaner production is an inevitable trend for the sustainable development of the paper industry, and the recycling of production water in the paper industry is an important way of cleaner production. The State Environmental Protection Administration's latest "Water Pollutant Discharge Standards for the Paper Industry" has pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F9/04C02F103/28
Inventor 刘名中刘晋嵩钟宏祥李红飞
Owner DONGGUAN NINE DRAGONS PAPER IND
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