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Fenton reaction iron sludge recycling method and Fenton reagent prepared by method

A technology of Fenton reaction and Fenton reagent, applied in the field of Fenton reagent, can solve the problems of complicated steps and high processing cost, and achieve the effects of fewer processing steps, low processing cost and easy control.

Inactive Publication Date: 2021-04-30
SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Both of the above-mentioned treatment methods use chemical methods to reduce ferric iron to ferrous iron and reuse it, which requires the addition of a large amount of chemical agents, and the treatment cost is high and the steps are cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment discloses a recovery and reuse method of Fenton reaction iron sludge.

[0037] Source of iron slime: Iron slime comes from the Fenton fluidized bed that performs deep advanced oxidation treatment on styrene wastewater; The rate is about 40% iron slime. The COD of styrene wastewater before Fenton fluidized bed treatment is 250 mg / L-300 mg / L, the ammonia nitrogen is 0-5 mg / L, and the pH is 6.2-6.8; the COD of the effluent after treatment is 140-150 mg / L.

[0038] Specific steps:

[0039] (1) Weigh the iron slime; based on the dry weight of the iron slime, add 6 to 8 times the mass of water to dilute the iron slime to a turbid liquid; add 4 times the mass of concentrated sulfuric acid to the iron slime turbid liquid, and ℃ heating and stirring to dissolve the iron sludge.

[0040](2) Add 0.5 to 0.6 times the mass of oxalic acid to the reaction product of step (1) based on the dry weight of the iron slime; heat and reflux at 120°C to 150°C for 6 hours to ...

Embodiment 2

[0045] This embodiment discloses a recovery and reuse method of Fenton reaction iron sludge.

[0046] Source of iron slime: iron slime comes from the Fenton fluidized bed that performs deep advanced oxidation treatment of printing and dyeing wastewater; About 90% iron slime. The COD of styrene wastewater before Fenton fluidized bed treatment is 100-150mg / L, the ammonia nitrogen is 0-5mg / L, and the pH is 7.5-7.8; the COD of the effluent after treatment is less than 60mg / L.

[0047] Specific steps:

[0048] (1) Weigh the iron slime; based on the dry weight of the iron slime, add 0.5 to 1 times the mass of water to dilute the iron slime to the turbid liquid; add 0.5 to 0.6 times the mass of concentrated sulfuric acid to the iron slime turbid liquid, and ℃ ~ 150 ℃ heating and stirring to dissolve the iron sludge.

[0049] (2) Based on the dry weight of the iron slime, add 0.55 times the mass of oxalic acid to the reaction product of step (1); heat and reflux at 120°C to 150°C f...

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Abstract

The invention relates to a Fenton reaction iron sludge recycling method and a Fenton reagent obtained by the method, the Fenton reaction iron sludge recycling method comprises the following steps: (1) weighing iron sludge, adding water for dilution, then adding concentrated acid into the diluted iron sludge, and carrying out heating reaction to dissolve the iron sludge; (2) adding oxalic acid into the reaction product, and heating for reaction to reduce Fe < 3 + > into Fe < 2 + >; and (3) adding hydrogen peroxide to remove COD (Chemical Oxygen Demand), and forming a Fenton reagent with Fe < 2 + > to recycle the iron sludge. The invention also relates to a Fenton reagent which is prepared by adopting the method for recycling the Fenton reaction iron sludge. According to the method, a conventional reagent is adopted, and a concentrated acid dissolution-oxalic acid reduction-hydrogen peroxide oxidation combined process is adopted for treatment, so that the Fenton reagent with a good catalytic effect can be obtained from the iron sludge, and effective recycling of the iron sludge is realized; and moreover, the iron sludge treatment process is simplified, the process control is facilitated, the iron sludge treatment cost is reduced, and the resource waste is reduced.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for recovering and reusing Fenton reaction iron sludge and a Fenton reagent obtained by the method. Background technique [0002] At present, advanced oxidation technologies commonly used in sewage treatment include Fenton oxidation, electrochemical oxidation, and ozone oxidation. The Fenton oxidation technique is under acidic conditions Fe 2+ Catalytic H 2 o 2 Produce strong oxidizing hydroxyl radicals (OH) to oxidize refractory pollutants in wastewater into small molecular organic or inorganic substances. The reaction can be carried out at normal temperature and pressure. The process is simple and has huge industrialization potential. promotional potential. Although the Fenton reaction has a strong removal effect on toxic, harmful and refractory pollutants in water bodies, a large amount of Fenton iron sludge is produced at the same time. If the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
CPCC02F1/722C02F1/725C02F2305/026
Inventor 陈建军王慧丽
Owner SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH