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Fenton and Fenton-like reaction catalyst regeneration and reclamation method

A catalyst and reaction technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as obstacles to popularization and application, and achieve the goals of avoiding secondary pollution, good industrial application prospects, and reducing consumption Effect

Inactive Publication Date: 2009-07-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since wet oxidation needs to be carried out under high temperature and high pressure conditions, the requirements for equipment materials are particularly high, thus hindering the popularization and application of this method

Method used

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  • Fenton and Fenton-like reaction catalyst regeneration and reclamation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Treatment of fine chemical wastewater containing refractory organics such as nitrobenzene and chlorobenzene by Fenton reagent oxidation method

[0022] Step 1. Use Fenton reagent oxidation method to pretreat fine chemical wastewater: add 1mmol FeSO per liter of wastewater 4 ·7H 2 O, 10mmol H 2 O 2 After stirring and reacting for 480 minutes under the condition of the initial pH value of 3.5, the pH of the reaction solution was adjusted to 7.5 with 6mol / L NaOH solution, and the solution was allowed to settle for 2 hours. The supernatant was drained by siphoning to obtain iron-containing contamination. mud;

[0023] The COD of the fine chemical wastewater before the reaction was 1200 mg / L, the COD of the wastewater after the reaction was 372 mg / L, and the COD removal rate was 69%.

[0024] Step 2: Dehydrate the iron-containing sludge by vacuum filtration, and place the resulting filter cake in an oven at 105±1℃ to dry until the moisture content is 5%; then place the...

Embodiment 2

[0029] Example 2 Treatment of fine chemical wastewater containing refractory organics such as nitrobenzene and chlorobenzene by Fenton-like reagent oxidation method

[0030] Step 1. Use Fenton-like reagent oxidation method to pre-treat fine chemical wastewater: add 1mmol of fresh Fe per liter of wastewater 2 (SO 4 ) 3 , 10mmol H 2 O 2 After stirring and reacting for 480 minutes under the condition of the initial pH value of 3.5, the pH of the reaction solution was adjusted to 7.5 with 6mol / L NaOH solution, and the solution was allowed to settle for 2 hours. The supernatant was drained by siphoning to obtain iron-containing contamination. mud;

[0031] The COD of the fine chemical wastewater before the reaction was 1200 mg / L, the COD of the wastewater after the reaction was 492 mg / L, and the COD removal rate was 59%.

[0032] Steps 2 and 3 are the same as in Example 1.

[0033] Step 4. Add the regenerated iron sulfate solution to the above-mentioned fine chemical wastewater to repl...

Embodiment 3

[0036] Example 3 Treatment of fine chemical wastewater containing refractory organics such as nitrobenzene and chlorobenzene by Fenton-like reagent oxidation method

[0037] Steps 1, 3, and 4 are the same as in Example 2, and Step 2 is as follows:

[0038] Step 2. Dehydrate the iron-containing sludge by vacuum filtration, and place the resulting filter cake in an oven at 120±1℃ to dry until the moisture content is 9%; then place the dried iron-containing sludge Burn in a muffle furnace at 500°C for 10 minutes to obtain iron residue. At this time, the removal rate of organic matter (TOC) in the iron residue is 97%.

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PUM

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Abstract

The invention relates to a regenerating and recycling method of Fenton and Fenton like reaction catalyst. The method comprises the following steps of: (1) taking hydrogen peroxide as oxidant and ferrous ion or iron ion as catalyst to treat organic waste water which is difficult to degrade and carrying out neutralization precipitation to obtain ferriferous sludge; (2) dehydrating the ferriferous sludge, drying the ferriferous sludge at a temperature between 100 and 150 DEG C and then burning the ferriferous sludge at a temperature between 350 and 550 DEG C to obtain iron residues; (3) adding dilute sulphuric acid in the iron residues to obtain a ferric sulfate solution; and (4) taking the ferric sulfate solution as Fenton like reaction catalyst used in the oxidative treatment of the organic waste water which is difficult to degrade. The regenerating and recycling method has the advantages that the method can remove more than 95 percent of organic substances in ferriferous sludge, thereby avoiding secondary pollution; the obtained ferric sulfate solution can be used as Fenton like reaction catalyst to reduce the consumption of fresh catalyst; moreover, the method has ideal treatment effect, low cost, convenient operation and enormous application prospect.

Description

【Technical Field】 [0001] The invention relates to the technical field of wastewater treatment by chemical methods, and relates to oxidation treatment and catalyst recovery and reuse. Specifically, it is a method for regeneration and reuse of Fenton and Fenton-like reaction catalysts. 【Background technique】 [0002] Fenton reagent (H 2 O 2 / Fe 2+ ) And Fenton-like reagent (H 2 O 2 / Fe 3+ ) The oxidation method is widely used in the treatment of toxic, harmful and difficult-to-degrade organic wastewater. In the Fenton oxidation reaction, ferrous ions are used as catalysts, and the ferrous ions are oxidized to iron ions in the Fenton oxidation process. Iron ions are used as catalysts in Fenton-like oxidation reactions. The reaction of treating refractory organic wastewater with Fenton reagent and Fenton-like reagent is carried out under acidic conditions. After the reaction, the pH value of the reaction solution needs to be adjusted to neutral with lye. At this time, Fenton and Fent...

Claims

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Application Information

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IPC IPC(8): B01J27/30B01J27/053C02F1/72C02F1/66C02F11/12
Inventor 曹国民盛梅牛文峰费宇雷李栋迟峰
Owner EAST CHINA UNIV OF SCI & TECH
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