Treatment method of papermaking PVA wastewater

A treatment method and technology for wastewater, which are applied in the process of wastewater treatment, water/sewage treatment, and water treatment parameter control. The effect of shortening the post-processing time

Inactive Publication Date: 2020-09-15
河北和悦环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The COD of the PVA aqueous solution is very high, while the BOD 5 / COD cr Value (B / C ratio) < 0.1, it is difficult to be degraded and utilized by ordinary microorganisms, and it is very difficult to deal with. If it accumulates in a large amount in natural water bodies, it will not only increase the foam on the surface of the polluted water body, increase the viscosity, and affect aerobic microorganisms activities, it will also cause the accumulation of heavy metals, which will lead to more serious ecological problems

Method used

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  • Treatment method of papermaking PVA wastewater

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Experimental program
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Effect test

Embodiment 1

[0034] This embodiment provides a method for treating papermaking PVA wastewater, and the steps are as follows:

[0035] (1) Water quality of PVA waste liquid: PVA concentration is 5.4%, COD=98000~100000mg / L, 200ml PVA waste liquid is treated in a single test.

[0036] (2) Add sodium sulfate, borax, sodium carbonate, and sodium bicarbonate to the PVA waste liquid, stir at 30°C for 30 minutes, and measure the COD removal rate in the PVA waste liquid and the water content of the recovered PVA gel.

[0037] (3) Determine the optimal addition amount of the above substances according to the orthogonal experiment, and the results are shown in Table 2.

[0038] Table 2

[0039]

[0040] It can be seen from Table 2 above that when the addition amount of sodium sulfate is 10g / L, borax 1.0g / L, sodium carbonate 1.0g / L, sodium bicarbonate 1.5g / L, the removal rate of COD in PVA wastewater is higher, which is 85.5%, the water content of the recovered PVA gel is also low, at 60.9%.

Embodiment 2

[0042] In this example, the best solution obtained in Example 1 was used for testing, and the degree of polymerization of the obtained PVA gel was tested.

[0043] Under certain reaction conditions, the relative molecular mass of the recovered PVA is determined by the viscosity method. From the Mark equation, the average relative molecular mass M of the recovered PVA is equal to 83805, which is not large in absolute and relative deviation from the average value of the PVA puree. The performance impact is minimal.

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Abstract

The invention discloses a treatment method of papermaking PVA wastewater, and belongs to the field of wastewater treatment. The method comprises the following steps of: (1) PVA waste liquid water quality: PVA concentration is greater than or equal to 5.0%; and (2) respectively adding 10-14 g / L of sodium sulfate, 0.8-1.2 g / L of borax, 0.8-1.2 g / L of sodium carbonate and 1-2 g / L of sodium bicarbonate into the PVA waste liquid, stirring, and recovering PVA gel. Aiming at the papermaking wastewater with the PVA concentration content of 5% or above, the invention provides an applicable treatment method, which can obviously reduce the water content of the recycled PVA gel, shortens the subsequent treatment time of the recycled PVA gel, does not influence the recovery rate of COD (Chemical OxygenDemand), does not greatly change the polymerization degree of the recycled PVA, and can be directly applied to the production of civil paper with lower quality requirements.

Description

Technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for treating papermaking PVA wastewater. Background technique [0002] Polyvinyl alcohol (PVA) is an important modern process material. Because of its good water solubility, adhesion, size film toughness and abrasion resistance, and strong resistance to organic solvents, it is widely used in textiles and paper. Products manufacturing, food packaging, medical equipment and other industries, and the output and consumption are increasing year by year, resulting in a large amount of PVA being discharged into the environment. Typical examples include textile desizing wastewater and papermaking wastewater. [0003] The COD of PVA aqueous solution is very high, while BOD 5 / COD cr Value (B / C ratio) <0.1, it is difficult to be degraded and utilized by ordinary microorganisms, and it is very difficult to deal with. If a large amount of accumulation in natural water bod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C08J11/04C02F103/28C02F101/34C08L29/04
CPCC02F1/58C08J11/04C02F2103/28C02F2101/34C02F2209/08C08J2329/04Y02W30/62Y02P20/143
Inventor 周云王硕郭方颖时静文
Owner 河北和悦环保科技有限公司
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