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Fenton reaction method for recycling iron-based catalyst

An iron-based catalyst and Fenton reaction technology, applied in chemical instruments and methods, water treatment of special compounds, oxidized water/sewage treatment, etc. Insufficient and other problems, to achieve the effect of reducing the amount of by-product sludge, reducing secondary pollution, and alleviating the intensity of treatment

Inactive Publication Date: 2020-05-05
李靖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this technical solution uses Fenton's sludge directly for biological anaerobic reduction or chemical reduction, and Fenton's sludge exists in solid form, biological anaerobic and chemical reduction are not sufficient for the solid-state reaction, making the reduction reaction It cannot be completely carried out, so the concentration of the reused ferrous ions cannot be quantified. The method provided further adds acid to dissolve ferrous sulfide or ferrous hydroxide and the unreduced ferric ions are released into the water again. For this, reuse Insufficient concentration of ferrous ions causes the Fenton reaction to fail

Method used

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  • Fenton reaction method for recycling iron-based catalyst
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Embodiment 1

[0032] See figure 1 , In this embodiment, Fenton is used to pretreat disperse dye wastewater, which contains diphenylamine and o-aniline substances, which are refractory toxic wastewater. The Fenton treatment of wastewater controls the pH at 3.5-4 by adding sulfuric acid, the dosing ratio of ferrous sulfate is 6‰, the ratio of ferrous iron and hydrogen peroxide is 5:1, and the COD before Fenton treatment is 2500-3000mg / L, After Fenton treatment, the COD is reduced by 700-800mg / L, and the generated sludge is dehydrated by high-pressure diaphragm filter press. The amount of sludge per ton of aquatic products is 10-15kg, and the moisture content of the sludge is 60%.

[0033]Transform the original Fenton treatment system into an iron-based catalyst recycling Fenton reaction system. The pH of the iron-based catalyst recycling Fenton reaction pool 1 is controlled at 3.5 to 4. 1 Iron-based catalyst recycling Fenton reaction pool 1 does not need to pass through Sulfuric acid is add...

Embodiment 2

[0036] Please refer to Figure 2. In this embodiment, advanced treatment is performed on the tail water after sewage treatment to reduce COD from 80mg / L to 40mg / L. The iron-based catalyst is recycled and the pH of the Fenton reaction cell 1 is controlled at 4-4.5. The ferrous sulfate added in the Fenton reaction tank 1 is 0.04‰, the ratio of ferrous iron and hydrogen peroxide is 5:1, and the effluent after the Fenton reaction is adjusted to pH in the collection tank 2 by adding alkali. 7.5 to 8, ferric hydroxide precipitation is produced, pumped into the concentration device 3 for mud-water separation, the moisture content of the sludge through the concentration device 3 drops from 98% to 95%, and the separated supernatant enters the safety pool 7, Adding 30% sulfuric acid to the concentrated sludge in the acid-dissolving device 4 reduces the pH of the acid-dissolving device 4 to 3.0, and the ferric hydroxide floc disappearing solution is transparent yellow-brown. In the chemi...

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Abstract

The invention discloses a Fenton reaction method for recycling an iron-based catalyst. The method comprises an iron-based catalyst recycling Fenton reaction tank, a collection tank, a concentration device, an acid dissolution device, a chemical reduction device, an iron-based catalyst recycling device, a safety tank, a sulfuric acid storage tank and a reducing agent storage tank. According to themethod, Fenton sludge formed by Fenton reaction is recycled and firstly subjected to acid dissolution, then reduced and finally recycled into the Fenton reaction, so that cyclic utilization of the iron-based catalyst in the Fenton reaction is realized, and consumption of iron by the Fenton reaction is reduced; Fenton sludge generated after the Fenton reaction is recycled, so that the amount of byproduct sludge of the Fenton reaction is reduced, the secondary pollution of the Fenton reaction to the environment is reduced, the treatment strength of the Fenton sludge is relieved, and the subsequent sludge treatment cost of the Fenton reaction is reduced; iron ions which cannot be recycled in the collecting tank are deeply separated only in the safety tank, so that the dosage of the required flocculating agent is reduced, and the flocculating agent is saved.

Description

technical field [0001] The invention relates to the technical field of Fenton reaction methods, in particular to a Fenton reaction method for recycling iron-based catalysts. Background technique [0002] The Fenton oxidation method is an advanced catalytic oxidation method, which is to add hydrogen peroxide (H 2 o 2 ), hydrogen peroxide (H 2 o 2 ) at Fe 2+ As a catalyst, it can generate hydroxyl radicals with strong oxidation effect, and at the same time initiate free radical chain reactions to oxidize organic and reducing substances. [0003] Its general process is: [0004] Fe 2+ +H 2 o 2 → Fe 2+ +OH - + 。 Oh [0005] Fe 2+ + OH → OH - +Fe 3+ [0006] Fe 3+ +H 2 o 2 → Fe 2+ +H + +HO 2 · [0007] HO 2 ·+H 2 o 2 →O2 +H 2 O + 。 Oh [0008] RH + 。 OH→R 。 +H 2 o [0009] R 。 +Fe 3+ →R + +Fe 2+ [0010] R + +O 2 →ROO + →…→CO 2 +H 2 o [0011] Since the electrode potential of hydroxyl radicals is 2.80V, it is much stronger...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/20C02F101/30
CPCC02F1/722C02F1/725C02F2101/203C02F2101/30C02F2305/026
Inventor 李靖
Owner 李靖