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Method for recycling pulping and papermaking sewage

A sewage circulation, pulping and papermaking technology, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the high cost of RO desalination treatment, high energy consumption, inability to solve inorganic salts, sticky Problems such as the continuous accumulation of substances, recoloring substances and sulfur-containing substances, etc., achieve the effects of reducing equipment investment and operating costs, simple operation, and saving power consumption

Inactive Publication Date: 2020-04-07
彭吉成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies of the existing technology, especially the existing sewage treatment process cannot solve the problem of continuous accumulation of inorganic salts, stickies, color-returning substances and sulfur-containing substances, it is unavoidable to use RO desalination treatment with high cost and high energy consumption. Deficiency, the present invention provides a kind of method for pulping and papermaking wastewater recycling

Method used

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  • Method for recycling pulping and papermaking sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add PAC flocculant to the sewage to be treated at 1000g per ton of water for pretreatment, and then carry out anaerobic reaction treatment and aerobic reaction treatment under the action of anaerobic sludge and aerobic sludge in turn. The salt in sewage is The form of inorganic salt sludge is mixed in anaerobic sludge and aerobic sludge and discharged to obtain desalted sewage; finally, polyacrylamide is added to the desalted sewage at a rate of 3kg per ton of water to reduce the residual suspended solids, The color-returning substances and organic matter are further treated, and the treated clean water that reaches the standard is reused in the paper workshop.

[0044] Before the anaerobic reaction, the temperature of the sewage is controlled at 12-42°C; the pH of the anaerobic reaction is controlled at 5.8-9. After the anaerobic reaction treatment, part of the salt in the sewage is precipitated in the form of inorganic salt sludge and mixed in the anaerobic sludge, an...

Embodiment 2

[0050] Such as figure 1 As shown, a method for recycling pulping and papermaking wastewater is carried out by using the following treatment device:

[0051] The treatment device includes a physical and chemical treatment device 1, an anaerobic reactor 2, an aerobic reactor 3, an advanced treatment device 4 and a sludge tank 5; the physical and chemical treatment device 1 is provided with a first sewage water inlet 1-1 , the first sewage water outlet 1-2 and the first mud discharge port 1-3; the anaerobic reactor 2 is provided with the second sewage water inlet 2-2, the second sewage water outlet 2-3, the first row Salt port 2-4, the first exhaust port 2-5 and the first sludge feed port 2-6; the aerobic reactor 3 is provided with a third sewage water inlet 3-1 and a third sewage water outlet 3-2. The second salt discharge port 3-3 and the second sludge feed port 3-4; the advanced treatment device 4 is provided with a fourth sewage water inlet 4-1, a drain port 4-2 and a second...

Embodiment 3

[0056] As described in Example 1, the difference is:

[0057] No sulfates and flocculants are added during pretreatment.

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Abstract

The invention relates to a method for recycling pulping and papermaking sewage. The method comprises the following steps: adding a sulfate and a flocculating agent into to-be-treated sewage for pretreatment, then sequentially carrying out anaerobic reaction treatment and aerobic reaction treatment under the action of anaerobic sludge and aerobic sludge, mixing salt in the sewage in the form of inorganic salt sludge in the anaerobic sludge and the aerobic sludge, and discharging to obtain desalted sewage; and finally, adding a sulfate, a redox agent and a flocculating agent into the desalted sewage to obtain treated clean water reaching the standard, and recycling the treated clean water to a papermaking workshop. According to the invention, COD, color reversion substances, suspended matters in water and other pollutants in sewage are effectively removed; the requirement for pulping and papermaking reuse water is completely met, color reversion of reuse water is effectively prevented, the paper quality is not affected during cyclic utilization, complex mechanical equipment is not needed, power consumption is reduced, system construction investment is reduced, operation is easy, andmanagement and operation are convenient.

Description

technical field [0001] The invention relates to a method for recycling pulping and papermaking sewage, and belongs to the technical field of environmental protection water treatment and purification. Background technique [0002] China is a country with severe drought and water shortage. The per capita water consumption is relatively low, and the cost of industrial water use is increasing year by year. The increasingly serious water pollution not only reduces the use function of water bodies, but also further aggravates the contradiction of water shortage. Therefore, in order to save water resources and reduce investment, it is imperative to develop a closed cycle technology for pulping and papermaking water. In recent years, some industries have increased the circulation of production water in order to reduce the amount of clean water used per ton of products. Some enterprises have adopted measures to reuse water after sewage treatment. The anaerobic system and the advance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/28
CPCC02F1/5236C02F1/56C02F1/76C02F1/78C02F3/30C02F9/00C02F2103/28C02F2209/08
Inventor 彭吉成
Owner 彭吉成
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