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Industrial wastewater treatment process of zero-valent iron internal electrolysis coupled internal circulating fluidized bed Fenton

A technology of industrial wastewater and treatment process, applied in the direction of oxidized water/sewage treatment, special compound water treatment, water/sewage treatment, etc., can solve the problem of low COD removal of wastewater, acid-base adjustment, and regular slag discharge without maximizing the utilization rate of chemicals and other problems, to achieve the effect of eliminating the generation of iron sludge, realizing regeneration and reuse, and improving the removal effect

Active Publication Date: 2019-03-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of low COD in wastewater removed by the traditional zero-valent iron technology, and the problems of acid-base adjustment, non-maximized chemical utilization rate, and regular slag discharge in the existing fluidized bed Fenton technology for industrial wastewater treatment, the present invention proposes a Industrial Wastewater Treatment Process of Zero-valent Iron Internal Electrolysis Coupled with Internal Circulating Fluidized Bed Fenton

Method used

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  • Industrial wastewater treatment process of zero-valent iron internal electrolysis coupled internal circulating fluidized bed Fenton
  • Industrial wastewater treatment process of zero-valent iron internal electrolysis coupled internal circulating fluidized bed Fenton
  • Industrial wastewater treatment process of zero-valent iron internal electrolysis coupled internal circulating fluidized bed Fenton

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Effect test

Embodiment 1

[0033] A kind of internal circulation fluidized bed Fenton reactor, structure such as figure 2As shown, the main body of the reactor is cylindrical, and the lower part is provided with a conical settling hopper. The side wall of the settling hopper is connected with the water inlet pipeline. A hydrogen peroxide pump 10 is arranged on the water inlet pipeline. The bottom of the settling hopper is connected with the return pipeline. The other end of the road is connected with the top side wall of the reactor main body 1 . A circulation pump 6 is provided on the return pipeline, a valve 5 is provided between the circulation pump 6 and the settling bucket, and a flow meter 7 is provided on the outlet pipeline of the circulation pump 6 . The device also includes a sodium hydroxide solution storage tank 11, which is connected to the fluidized bed reactor 1 through a sodium hydroxide solution pump 12. The liquid inlet of the sodium hydroxide solution is arranged in the middle part ...

Embodiment 2

[0040] In this example, the nitrobenzene production wastewater (COD 4000 mg / L-5000 mg / L, nitrobenzene concentration 200 mg / L, pH=3.5) requires the removal rate of nitrobenzene to reach 85%, and the removal rate of COD to reach 80% .

[0041] A kind of industrial wastewater treatment process of zero-valent iron internal electrolysis coupling internal circulating fluidized bed Fenton, the specific scheme and the equipment adopted are the same as embodiment 1, and the steps are as follows:

[0042] (1) For zero-valent iron, scrap iron chips (with a carbon content of 1%) are selected, the dosage is 5% of the mass ratio of wastewater, the reaction time is 2 hours, and the pH of the effluent is 6;

[0043] (2) In the reactor main body of the internal circulating fluidized bed Fenton reactor, the carrier above the glass beads is quartz sand of 80g / L, particle diameter 0.2mm;

[0044] (3) keep the residence time in the reactor main body (hereinafter referred to as fluidized bed) as 2...

Embodiment 3

[0051] In this embodiment, pharmaceutical wastewater (COD ~ 3000 mg / L, nitrobenzene concentration 150 mg / L, pH = 4.0) is used as the wastewater treatment for illustration.

[0052] A kind of industrial wastewater treatment process of zero-valent iron internal electrolysis coupling internal circulating fluidized bed Fenton, the specific scheme and the equipment adopted are the same as embodiment 1, and the steps are as follows:

[0053] (1) For zero-valent iron, scrap iron chips (with a carbon content of 1%) are selected, the dosage is 1% of the mass ratio of wastewater, the reaction time is 2 hours, and the pH of the effluent is 6.5;

[0054] (2) Add 80g / L of activated carbon in the fluidized bed, with a particle size of 0.6mm;

[0055] (3) keep the residence time in the fluidized bed as 2h;

[0056] (4) Control the ascending flow rate of the liquid in the fluidized bed to be 30m / h by returning the water outlet part from the top of the fluidized bed to the bottom, and add hyd...

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Abstract

The invention relates to an industrial wastewater treatment process of a zero-valent iron internal electrolysis coupled internal circulating fluidized bed Fenton, and an industrial wastewater treatment device. The process comprises the following steps: a. introducing industrial wastewater into a zero-valent iron reactor, enabling the industrial wastewater to be completely mixed and contacted withan appropriate amount of zero-valent iron for carrying out a reaction for 0.5-3h, and controlling the pH of the effluent of the zero-valent iron reactor to be 6+ / -0.5, wherein the internal electrolysis reaction is carried out by utilizing the reduction of the zero-valent iron in a reaction process, so that an electron-withdrawing group in the industrial wastewater is reduced and decomposed into anelectron-donating group, the color of the industrial wastewater is removed, the oxidizability of the industrial wastewater is improved, and divalent ferrous ions are produced; b. enabling the treatedindustrial wastewater to enter the internal circulating fluidized bed Fenton reactor, and carrying out a reaction for 1-2h; enabling the divalent iron ion crystals in the industrial wastewater to form iron hydroxide on the surface of a carrier, adding hydrogen peroxide for carrying out a reaction so as to form hydroxyl radicals to oxidize organic matters in the industrial wastewater into carbon dioxide and water, and removing COD from the industrial wastewater.

Description

technical field [0001] The invention relates to an industrial wastewater treatment process, in particular to an industrial wastewater treatment process and device for zero-valent iron internal electrolysis coupling internal circulating fluidized bed Fenton, and belongs to the technical field of water treatment. Background technique [0002] Wastewater from chemical, printing and dyeing industries often has the characteristics of high concentration, complex components, and high toxicity. Wastewater contains many toxic pollutants (such as halogenated organic compounds, nitroaromatic compounds, azo dyes, etc.), and the benzene ring becomes extremely stable due to the electron-withdrawing group, which has a strong inhibitory effect on microorganisms. Traditional biological treatment methods and physical and chemical treatment technologies are difficult to treat this kind of highly toxic industrial wastewater cost-effectively. [0003] Zero-valent iron is an important technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C02F101/30
CPCC02F1/4672C02F2101/30C02F2305/026C02F2305/023
Inventor 孙亮胡德皓张子昱杨春震李龙邓晓燕
Owner QINGDAO UNIV OF SCI & TECH
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