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Method for recycling Fenton iron mud

A technology of iron sludge and filter residue, which is applied in the field of solid waste resource treatment, can solve the problems of iron sludge secondary pollution, etc., and achieve the effects of reducing treatment costs, easy operation, and simple equipment

Active Publication Date: 2016-06-15
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the secondary pollution of iron slime caused by the Fenton oxidation method, the present invention introduces ultraviolet photocatalysis technology to form a self-circulation system of iron slime, without adding or discharging solid waste, and realizing the resource recycling of Fenton iron slime

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  • Method for recycling Fenton iron mud

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Embodiment 1

[0024] A kind of p-nitroaniline wastewater, the wastewater mainly contains ammonium chloride, a small amount of ammonia water, which is alkaline, the organic matter is p-nitroaniline, nitrochlorobenzene and its derivatives, and the COD is about 7000mg / L.

[0025] Step 1, add 0.3% ferrous sulfate and 3% hydrogen peroxide (based on the quality of wastewater) to p-nitroaniline wastewater, stir and react at 40-50°C for 1 hour, then add 0.2% activated carbon, and continue at room temperature Stir and react for 0.5h, filter and separate to obtain water and iron slime filter residue;

[0026] Step 2, add 15% sulfuric acid solution to the iron slime filter residue obtained in step 1, stir and dissolve at 70°C for 1 hour, and separate by filtration to obtain Fe 3+ Solution and activated carbon filter residue, the activated carbon filter residue can be reused in step 1 to form the self-circulation of the activated carbon system;

[0027] The dosage of sulfuric acid is based on the iron...

Embodiment 2

[0031] A No. 60 red hydrolysis mother liquor, the organic matter after analysis is mainly brominated anthraquinone derivatives, a small amount of urotropine and decomposition products, and the COD is about 16000mg / L.

[0032] Step 1, add 0.5% ferrous sulfate and 4% hydrogen peroxide (based on the quality of wastewater) to p-nitroaniline wastewater, stir and react at about 50°C for 1 hour, then add 0.3% activated carbon, and continue to stir and react at room temperature 0.5h, filter and separate to get water and iron sludge filter residue;

[0033] Step 2, add 15% sulfuric acid solution to the iron slime filter residue obtained in step 1, stir and dissolve at 70°C for 1 hour, and separate by filtration to obtain Fe 3+ Solution and activated carbon filter residue, the activated carbon filter residue can be reused in step 1 to form the self-circulation of the activated carbon system;

[0034] The dosage of sulfuric acid is based on the iron content in the iron sludge, and the r...

Embodiment 3

[0038] A kind of medical waste water, the main components are NaCl, gluconate, ethyl acetate and some small molecule solvents, its COD is about 15000mg / L, and its pH is about 5.

[0039] Step 1, add 0.5% ferrous sulfate and 5% hydrogen peroxide (based on the quality of wastewater) to the wastewater, stir and react at about 50°C for 1 hour, then add 0.4% activated carbon, continue to stir and react for 0.5 hours at room temperature, filter Separated water and iron sludge filter residue;

[0040] Step 2, add 15% sulfuric acid solution to the iron slime filter residue obtained in step 1, stir and dissolve at 70°C for 1 hour, and separate by filtration to obtain Fe 3+ Solution and activated carbon filter residue, the activated carbon filter residue can be reused in step 1 to form the self-circulation of the activated carbon system;

[0041] The dosage of sulfuric acid is based on the iron content in the iron sludge, and the reaction formula is as follows:

[0042] 2Fe(OH) 3 +3H...

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Abstract

The invention discloses a method for recycling Fenton iron mud. The method for recycling the Fenton iron mud comprises the following steps: 1, treating wastewater by adopting a Fenton process, after reaction is finished, adding 0.05-1% activated carbon for adsorbing and aiding filtration, stirring and reacting for 0.5-1 h, filtering and separating to obtain water and iron mud filter residue; 2, adding sulphuric acid into the iron mud filter residue, stirring and dissolving for 0.5-2 hours at the temperature of 60-80 DEG C, filtering and separating to obtain a Fe<3+> solution and activated carbon filter residue; and 3, placing a solution containing Fe<3+> into an ultraviolet light reaction tank, wherein the reaction tank contains a supported semiconductor catalyst, reducing Fe<3+> in the solution into Fe<2+> under the ultraviolet light catalytic condition, concentrating a Fe<2+> solution and then reusing the concentrated Fe<2+> solution in a Fenton oxidation wastewater treatment process in the step 1, so that self circulation of an iron mud system is formed. The method for recycling the Fenton iron mud has the advantages that the problem that iron mud secondary pollution is produced by the Fenton oxidation process is solved, recycling of iron resources and activated carbon is realized, and wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the field of solid waste resource treatment, in particular to a method for recycling Fenton iron slime. Background technique [0002] Fenton oxidation is an advanced oxidation technology that has emerged in recent years. It was first discovered by H.J.Fenton in 1894 that the use of Fe 2+ / H 2 o 2 The system can oxidize various organic compounds. Since then, many scholars have done a lot of research on the treatment of wastewater by Fenton method. The oxidation mechanism of the Fenton method is that Fe 2+ and H 2 o 2 Composition of Fenton's reagent constitutes an oxidation system. Its main functions are: on the one hand, it is the oxidation of organic matter, using catalytic H 2 o 2 Oxidative decomposition generates OH with strong oxidative properties; on the other hand, coagulation, Fe(OH) generated in Fenton oxidation reaction 3 Colloids have flocculation and adsorption functions, so they can also remove some organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
CPCC02F1/722C02F2305/026
Inventor 吕伏建王路峰陈丽娜
Owner ZHEJIANG QICAI ECO TECH CO LTD
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