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Method for treating wastewater containing polyvinyl alcohol

A polyvinyl alcohol and treatment method technology, which is applied in the reduction water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of large area, poor biodegradability, complicated management, etc. To achieve the effect of recycling, short time and high removal efficiency

Active Publication Date: 2018-09-07
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological method is to remove organic pollutants in wastewater through the growth and metabolism of microorganisms. Due to the poor biodegradability of polyvinyl alcohol wastewater, microorganisms have certain requirements for nutrients, temperature, pH and other conditions. complex and other issues, so this method also has great limitations in practical application

Method used

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  • Method for treating wastewater containing polyvinyl alcohol
  • Method for treating wastewater containing polyvinyl alcohol
  • Method for treating wastewater containing polyvinyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, it shows a schematic flow chart of the treatment method of polyvinyl alcohol-containing wastewater of the present invention. Get 100mL of polyvinyl alcohol (polymerization degree is 2500) solution containing 500mg / L, add a certain amount of ferrous sulfate and ferric chloride wherein the molar ratio is 1:2, make Fe in the mixed solution 2+ The concentration is 5mmol / L, Fe 3+ The concentration of the mixture is 10mmol / L, after stirring evenly at a certain speed (50r / min) at 15°C, adjust the pH to 11 with sodium hydroxide, and react for 90min. After passing through the membrane, the concentration of polyvinyl alcohol in the mixed solution was measured by Finley spectrophotometry.

[0039] The measurement results are shown in Table 1.

Embodiment 2

[0041] Get 100mL of polyvinyl alcohol (polymerization degree is 2500) solution containing 1000mg / L, add a certain amount of ferrous chloride and ferric nitrate that the molar ratio is 1:2 to it, make Fe in the mixed solution 2+ The concentration is 10mmol / L, Fe 3+ The concentration of the solution is 20mmol / L. After stirring evenly at a certain speed (150r / min) at room temperature (25°C), adjust the pH to 11 with sodium hydroxide, and react for 30min. After magnetic separation, the concentration of polyvinyl alcohol in the mixed solution was measured by Finley spectrophotometry.

[0042] The measurement results are shown in Table 1.

Embodiment 3

[0044] Get 100mL of polyvinyl alcohol (polymerization degree is 2500) solution containing 3000mg / L, add a certain amount of ferrous sulfate and ferric chloride wherein the molar ratio is 1:2, make Fe in the mixed solution 2+ The concentration is 20mmol / L, Fe 3+ The concentration of the mixture is 40mmol / L. After stirring evenly at a certain speed (500r / min) at room temperature (25°C), adjust the pH to 11 with ammonia water and react for 60min. After static precipitation, the concentration of polyvinyl alcohol in the mixed solution was measured by Finley spectrophotometry.

[0045] The measurement results are shown in Table 1.

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Abstract

The invention relates to a method for treating wastewater containing polyvinyl alcohol. The method comprises the following steps: adding Fe<2+> and Fe <3+> into the wastewater containing the polyvinylalcohol, and evenly stirring, wherein the molar ratio of the Fe<2+> to the Fe <3+> is 1 to 2; then, adjusting the pH value of mixed liquid, and carrying out solid-liquid separation after a reaction is finished. Compared with the traditional polyvinyl alcohol wastewater treatment method, the method, provided by the invention, for treating the wastewater containing the polyvinyl alcohol has the advantages of high removal efficiency, short needed time and simpleness in operation, and enables final precipitate to be easily recycled.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment method for waste water containing polyvinyl alcohol. Background technique [0002] Due to its excellent water solubility and adhesion, polyvinyl alcohol is often used as adhesive, thickener, emulsifier and textile slurry, and is widely used in chemical industry, paper making, construction, printing and dyeing and textile industries. Wastewater containing polyvinyl alcohol will pose a serious threat to the ecological environment after entering the environment. Polyvinyl alcohol is difficult to be biodegraded, and it takes 900 days for the polyvinyl alcohol discharged into the water environment to be completely degraded [, the accumulated polyvinyl alcohol increases the viscosity of the water body, produces foam on the surface of the water body, and affects the reoxygenation of the water body and the activity of aerobic microorganisms . At th...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/34
CPCC02F1/70C02F2101/34
Inventor 石宝友郝昊天韩昆
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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