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Method and device for treating wastewater by intensified micro-electrolysis-Fenton oxidation method

A technology for wastewater treatment and micro-electrolysis, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of toxic intermediate products, high treatment costs, secondary pollution, etc. Reach the effect of shortening the reaction time, simplifying the technological process and reducing the processing cost

Active Publication Date: 2015-02-04
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the Fenton method alone has problems such as high processing cost, easy to generate toxic intermediate products, and secondary pollution. Therefore, it is still the focus of research to combine the Fenton method with other processes to treat wastewater to improve the degradation efficiency of wastewater and reduce treatment costs.

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  • Method and device for treating wastewater by intensified micro-electrolysis-Fenton oxidation method

Examples

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Embodiment 1

[0052] Example 1: Treatment of high-concentration printing and dyeing wastewater in a printing and dyeing factory. Wastewater is dark brown, pH is 2.5, color is 1200~1500 times, COD Cr 15000~32000mg / L. Micro-electrolysis was used to pretreat 1.5L of wastewater, the amount of iron powder added was 10g / L, the mass ratio of iron to carbon was Fe:C=0.5:1, the reaction time was 1.5h, and the stirring speed of the stirrer was 400r / min. , COD Cr Reduced by 30~50%, chromaticity decreased by about 20%; adjust the volume flow rate of micro-electrolyzed water and hydrogen peroxide to 5:1, the added H 2 o 2 The amount is about 0.05mol / L, COD after 2 hours of reaction Cr The removal rate reaches 60~70%, and the chroma removal rate reaches more than 95%. However, using the impingement flow-rotating packed bed (IS-RPB) as the liquid-liquid contact and reaction device, the two fluids of hydrogen peroxide and waste water collide with each other at an initial velocity of 0.5m / s, using corr...

Embodiment 2

[0053] Example 2: Treatment of dinitrotoluene (DNT) in waste water from a propellant and explosive factory. The initial concentration of dinitrotoluene in wastewater is 400mg / L, and the biochemical coefficient is only 0.1. Micro-electrolysis is used to treat 2.0L of wastewater. At pH=3, the amount of iron powder added is 20g / L, and the mass ratio of iron to carbon Fe: C=1.5:1, the reaction time is 2h, and the stirring speed of the stirrer is 200r / min, more than 80% of the nitro compounds are converted into aniline substances, and the flow meter is adjusted so that the volume flow ratio of the micro-electrolyzed water and hydrogen peroxide is 8 :1,H 2 o 2 The concentration is 0.03mol / L, the speed of impinging flow-rotating packed bed (IS-RPB) is 1500rpm, and the initial velocity of the two fluids of hydrogen peroxide and wastewater colliding is 3m / s. After 40min of degradation, the pollutant removal rate reaches 95% % or more; while the waste water that has not been pretreate...

Embodiment 3

[0054] Embodiment 3: Treatment of TNT wastewater. The concentration of trinitrotoluene in the wastewater is 100 mg / L, and the pH value is adjusted to 2.0 with dilute sulfuric acid. Take 2L of water sample, and use micro-electrolysis to pretreat the wastewater. The amount of iron powder added is 30g / L, the mass ratio of iron to carbon is 3:1, the stirring speed is 800r / min, and the reaction time is 1.5h. More than % of nitro compounds are converted into aniline substances, adjust the volume flow ratio of micro-electrolysis water and hydrogen peroxide to 10:1, the concentration of hydrogen peroxide is 0.01mol / L, and the speed of impinging flow-rotating packed bed device (IS-RPB) is 300rpm , Hydrogen peroxide and waste water collide with each other at an initial velocity of 10m / s. Stainless steel porous corrugated plate is used as filler. After 50 minutes of reaction, the removal rate of organic pollutants in waste water reaches 97%. The biochemical coefficient is above 0.5; whi...

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Abstract

The invention belongs to the technical field of industrial production wastewater treatment, in particular relates to a method and device for treating wastewater by an intensified micro-electrolysis-Fenton oxidation method, and solves the problem of an exiting industrial wastewater treatment method. The method comprises the following steps of performing micro-electrolytic reduction reaction on wastewater; and performing impact between the wastewater and hydrogen peroxide in liquid-liquid reaction equipment, wherein Fe<2+> in the waste water and hydrogen peroxide form a Fenton reagent; and organic pollutants in the wastewater are degraded under the synergic action of the micro-electrolysis-Fenton reagent. The device comprises an impinging stream-rotary packed bed device, wherein the liquid inlet tube I and the liquid inlet tube II of the impinging stream-rotary packed bed device are respectively connected with a hydrogen peroxide storage tank and a micro-electrolysis bath; and the liquid outlet is connected with the micro-electrolysis bath. The method and the device have the beneficial effect that process flow is simple and convenient to operate; the advantages of various technologies are given a full play by coupling the three technologies to reach the aim of treating waste by using waste, so that the treatment cost can be furthest reduced.

Description

technical field [0001] The invention belongs to the technical field of industrial production wastewater treatment, and specifically relates to a method and device for strengthening micro-electrolysis-Fenton oxidation method for treating wastewater, which uses physical adsorption, electrochemical reduction technology and Fenton method oxidation technology for coupled treatment. Background technique [0002] Micro-electrolysis technology was proposed by former Soviet scientists in the 1970s and used for the treatment of printing and dyeing wastewater. This method is a process technology that uses the principle of metal corrosion to form a primary battery to treat wastewater, also known as internal electrolysis. The electrodes of micro-electrolysis generally use two or more materials with a large potential difference. In the absence of an external electric field, the potential difference between the cathode and the anode forms a battery effect and produces physical and chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 刘有智焦纬洲祁贵生袁志国高璟栗秀萍申红艳张巧玲刘文丽
Owner ZHONGBEI UNIV
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