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Method for processing waste water generated by water jet abrasives

A technology of water jet mill and wastewater treatment, which is applied in the direction of water/sewage multi-stage treatment, flotation water/sewage treatment, oxidized water/sewage treatment, etc. Suitable for industrial applications and other issues, to achieve the effect of low cost, simple and feasible treatment method, and no secondary pollution

Inactive Publication Date: 2011-01-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the wastewater is treated and discharged, it will not only require higher treatment costs, but also cause waste of effective substances
In the industrial production of water jet abrasives, polyvinyl alcohol does not participate in the polymerization reaction as a dispersant. After the reaction, 60%-70% PVA exists in the wastewater in a dissolved state, which is the main contributor to the COD value of wastewater and has biochemical properties. If it is discharged into the water body, because of its large surface activity, the received water body will generate a lot of foam, which is not conducive to the reoxygenation of the water body, and will also promote the migration and release of heavy metals in the water body sediments, which will damage the water body environment.
Generally, it is first recovered and then processed. Among the recovery methods, the salting-out gel method has the highest recovery efficiency, but this method will cause secondary pollution and is not suitable for industrial applications. Therefore, it is necessary to develop a more practical method to deal with Wastewater from PVA

Method used

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  • Method for processing waste water generated by water jet abrasives
  • Method for processing waste water generated by water jet abrasives
  • Method for processing waste water generated by water jet abrasives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A) Recover part of PVA by electric flotation: first add 400mL of PVA-containing wastewater produced by water jet abrasives into the electrolytic cell equipped with a magnetic stirrer, and add electrolyte Na 2 SO 4 Start to stir afterward, make the concentration of electrolyte in waste water reach 0.05mol / L, regulate the voltage in the electrolyzer to 12V simultaneously, the froth scum that will produce in the stirring process is collected, and stirring time is 120min, wherein said electrolysis Both the anode and the cathode in the tank adopt graphite electrodes, and the distance between the anode and the cathode is controlled at 32 mm. The recovery rate of PVA was calculated to be 40.8%.

[0020] B) Use the Fenton oxidation method to treat the wastewater that has recovered part of the PVA by the electric float method: take 200ml of wastewater and place it in a container, adjust the pH value to 4 and stir, and then add H to the wastewater 2 o 2 and FeSO 4 ·7H 2 O, H...

Embodiment 2

[0022] A) Recover part of PVA by electric flotation: first add 400mL of PVA-containing wastewater produced by water jet abrasives into the electrolytic cell equipped with a magnetic stirrer, and add electrolyte Na 2 SO 4 Start to stir afterward, make the concentration of electrolyte in waste water reach 0.075mol / L, regulate the voltage in the electrolyzer to 10V simultaneously, the foam scum that will produce in the stirring process is collected, and stirring time is 150min, wherein said electrolysis Both the anode and the cathode in the tank adopt graphite electrodes, and the distance between the anode and the cathode is controlled at 32 mm. The recovery rate of PVA was calculated to be 43.2%.

[0023] B) Use the Fenton oxidation method to treat the wastewater that has recovered part of the PVA by the electric float method: take 200ml of wastewater and place it in a container, adjust the pH value to 4 and stir, and then add H to the wastewater 2 o 2 and FeSO 4 ·7H 2 O, H...

Embodiment 3

[0025] A) Recover part of PVA by electric flotation: first add 400mL of PVA-containing wastewater produced by water jet abrasives into the electrolytic cell equipped with a magnetic stirrer, and add electrolyte Na 2 SO 4 Start to stir afterward, make the concentration of electrolyte in waste water reach 0.1mol / L, regulate the voltage in the electrolyzer to 12V simultaneously, the foam scum that will produce in the stirring process is collected, and stirring time is 240min, wherein said electrolysis Both the anode and the cathode in the tank adopt graphite electrodes, and the distance between the anode and the cathode is controlled at 32mm. The recovery rate of PVA was calculated to be 52.3%.

[0026] B) Use the Fenton oxidation method to treat the wastewater that has recovered part of the PVA by the electric float method: take 200ml of wastewater and place it in a container, adjust the pH value to 4 and stir, and then add H to the wastewater 2 o 2 and FeSO 4 ·7H 2 O, H 2...

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Abstract

The invention discloses a method for processing waste water generated by water jet abrasives. The method has the advantages of simplicity and practicability, and the processed waste water can reach the discharge standard. The method comprises the following steps of: A) recovering part of PVA by an electroflotation method; and B) processing waste water in which part of PVA is recovered by the electroflotation method by using a Fenton oxidation method, namely inducing the waste water into a container, regulating the pH value to be between 3 and 5, stirring the waste water, adding H2O2 and FeSO4.7H2O into the waste water, wherein 8 to 18 mL of the H2O2 is added into 1 L of the waste water, and according to the using amount of the FeSO4.7H2O, the molar ratio of n(H2O2 / Fe<2+>) is 10:1-12:1, controlling the reaction time to be 40 to 80 minutes, and regulating the pH value to be between 8 and 9 by using solution of NaOH after the reaction is finished.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method produced by water jet abrasives. Background technique [0002] During the industrial production and preparation of water jet abrasives, a large amount of organic wastewater is produced. Generally, 3 tons of production wastewater will be generated for every 1 ton of coarse abrasive produced. This type of wastewater contains a large amount of dispersant polyvinyl alcohol that does not participate in the reaction and a small amount of unreacted polymeric bulk material. If the wastewater is treated and then discharged, it will not only require higher treatment costs, but also cause waste of effective substances. In the industrial production of water jet abrasives, polyvinyl alcohol does not participate in the polymerization reaction as a dispersant. After the reaction, 60%-70% PVA exists in the wastewater in a dissolved state, which is the main contribut...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/465C02F1/72
Inventor 张宇峰李志涛夏阳魏无际
Owner NANJING UNIV OF TECH
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