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Method for preparing Fenton reagent on site for treating waste water

A technology for on-site preparation and treatment of wastewater, applied in the field of water treatment, can solve the problems of easy electrode pollution, low efficiency, low working current density, etc.

Inactive Publication Date: 2010-06-16
杭州生源医疗保健技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The present invention will solve the existing Fenton reagent on-site generation technology all is to obtain hydrogen peroxide and Fe in the water treatment system through the electrochemical method on the spot. 2+ There are problems of low working current density, low efficiency, easy pollution of electrodes and unstable OH generation

Method used

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  • Method for preparing Fenton reagent on site for treating waste water
  • Method for preparing Fenton reagent on site for treating waste water
  • Method for preparing Fenton reagent on site for treating waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0083] In a diaphragmless electrochemical H 2 o 2 generator, see Figure 4 , with graphite and polytetrafluoroethylene gas diffusion electrode prepared by techniques known in the art as the cathode, with stainless steel as the anode, with 0.5mol / L NaOH solution as the electrolyte and feed in at a speed of 2ml / min Generator, the air is fed into the air chamber at a flow rate of 200ml / min, the air outlet is placed 30cm below the water surface, and 500A / m is fed between the anode and the cathode 2 direct current, the working temperature is 10°C, and the outflowing electrolyte contains H 2 o 2 0.4mol / L or so, the current efficiency is 46.32%. In another diaphragmless electrochemical Fe 2+ generator, see Figure 7 , with iron plates as cathode and anode, with 0.5mol / L H 2 SO 4 It is the electrolyte and passes through the generator at a speed of 1ml / min, and 1000A / m is passed between the anode and the cathode 2 direct current, the working temperature is 10°C, and the outflo...

Embodiment 2

[0085] H in Example 1 2 o 2 The generator uses a polypropylene fiber diaphragm to separate the electrode chamber into a cathode chamber 8 and an anode chamber 7, see Figure 5 , the gas diffusion electrode prepared with X72 carbon black and polytetrafluoroethylene is used as the cathode, and the titanium-supported platinum is used as the anode, and H 2 SO 4 0.5mol / L sodium sulfate solution with pH adjusted to 3.0, oxygen is passed into the gas chamber 4 at a flow rate of 10ml / min, the gas outlet is not under pressure, and 50A / m is passed between the anode and the cathode 2 direct current, the working temperature is 25°C, and the outflowing electrolyte II’ contains H 2 o 2 About 0.6mol / L, the current efficiency is 77.20%. Fe described in Example 1 2+ In the generator, use 45# carbon steel mesh as the anode and stainless steel as the cathode, add 100ml of the above wastewater plus sulfuric acid solution to a sulfuric acid content of 0.05mol / L, and feed 3000A / m at 20°C 2 T...

Embodiment 3

[0087] H in Example 2 2 o 2 The diaphragm in the generator was changed to Nafion 117 cation exchange membrane, the gas diffusion electrode made of graphite, acetylene black and polytetrafluoroethylene was used as the cathode, the nickel mesh was used as the anode, and 0.5mol / L potassium sulfate and 0.25mol The mixed solution composed of potassium hydroxide per L is the catholyte, and 20% potassium hydroxide solution is used as the anolyte. chamber, the gas outlet is placed 20cm below the water surface, and 2000A / m is passed between the anode and the cathode 2 direct current, the working temperature is 35°C, and the outflowing electrolyte contains H 2 o 2 1.2mol / L, the current efficiency reaches 96.49%. Fe described in Example 1 2+ In the generator, iron, carbon steel and alloy steel wastes are placed in a titanium basket as the anode, and stainless steel as the cathode, add 20g of sodium sulfate to 1L of the above acid rose red B wastewater, and adjust the pH value with s...

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Abstract

The invention provides a method for preparing a Fenton reagent on site for treating waste water, which can effectively remove chromaticity, turbidity and COD from waste water, degrade nonbiodegradable organic matters and poisonous inorganic matters having reducibility, and promote the biochemistry capability of waste water to be treated. A mixing reactor is arranged. Outside of the mixing reactor, aqueous solution of hydrogen peroxide which forms the Fenton reagent is prepared on site and a Fe2+-containing aqueous solution which forms the Fenton reagent is prepared on site. The waste water, the aqueous solution of hydrogen peroxide and the Fe2+-containing aqueous solution are mixed in the mixing reactor, Fenton oxidizing reaction is preformed and then sediment is generated and the treatedwater is acquired after being separated. The method is applied to waster water purifying treatment.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a water treatment method using Fenton's reagent generated on-site electrochemically. Background technique [0002] At present, among the existing wastewater treatment technologies, biochemical treatment is the method with the lowest cost and the best effect for the wastewater that is easy to biochemically treat. However, there are many wastewater whose biochemical properties cannot meet the requirements of biochemical treatment, such as printing and dyeing wastewater, coking wastewater, phenolic wastewater, pharmaceutical wastewater, landfill leachate, etc. These wastewater containing high concentrations of refractory organic matter contain inhibitory The growth of microorganisms, even the components that are toxic and harmful to microorganisms, microorganisms basically cannot survive in such an environment, that is, it is impossible to use biochemical methods to treat such wastewater....

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/70
Inventor 莫一平刘美星周欣桦吕培发
Owner 杭州生源医疗保健技术开发有限公司
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