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Application of biodegradable chelating agent EDDS (Ethylenediaminedisuccinic Acid) to treatment on non-degradable organic wastewater

A technology of organic wastewater and chelating agent, applied in the application of biodegradable chelating agent EDDS in the treatment of refractory organic wastewater, the application of improved Fenton/Fenton-like oxidation method in the treatment of refractory organic wastewater, biodegradable chelating agent In the field of mixtures, it can solve problems such as unreported, and achieve the effect of solving secondary pollution, strengthening removal capacity, and improving utilization rate.

Inactive Publication Date: 2014-01-01
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic research on EDDS is mainly concentrated in the fields of heavy metal contaminated soil remediation and phytoremediation, while the research on EDDS improving Fenton / Fenton-like method for wastewater treatment has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Fenton method handles 4-chlorophenol

[0033] Add 4 mmol H 2 o 2 and 1 mmol FeSO 4 , after 4 hours the removal rate of 4-chlorophenol was 15.3%, 24 hours removal rate was 20.2%, 3 days removal rate was 21.1%, 7 days removal rate was 24.2%; 4 hours H 2 o 2 The remaining amount is 89.3%, 87.3% in 24 hours, 77.3% in 3 days, 69.7% in 7 days; 9.4% in 4 hours, 3.7% in 24 hours, 1.2% for 3 days and 1.0% for 7 days.

Embodiment 2

[0034] Embodiment 2: EDDS improves the Fenton method to process 4-chlorophenol

[0035] Add 4 mmol H 2 o 2 , 1 mmol EDDS and 1 mmol FeSO 4 , the removal rate of 4-chlorophenol was 92.7% through 4 hours, the removal rate was 99.2% in 24 hours, the removal rate was 99.6% in 3 days, and the removal rate was 100% in 7 days; 2 o 2 The remaining amount is 32.2%, 10.9% in 24 hours, 6.9% in 3 days, 3.6% in 7 days; 99.1% in 4 hours, 99.2% in 24 hours, The remaining amount in 3 days is 100%, and the remaining amount in 7 days is 94.9%.

Embodiment 3

[0036] Embodiment 3: Fenton method processes methyl orange solution

[0037] Add 4mmol H 2 o 2 and 1 mmol FeSO 4 , the removal rate of methyl orange was 23.6% through 4 hours, 37.0% in 24 hours, 41.3% in 3 days, and 46.2% in 7 days; 2 o 2 The remaining amount is 87.5%, 86.5% in 24 hours, 72.3% in 3 days, 64.7% in 7 days; 13.4% in 4 hours, 11.7% in 24 hours, The remaining amount in 3 days is 10.2%, and the remaining amount in 7 days is 7.0%.

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PUM

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Abstract

The invention provides an application of a biodegradable chelating agent EDDS (Ethylenediaminedisuccinic Acid) to treatment on non-degradable organic wastewater. The application concretely comprises the steps of adding the biodegradable chelating agent EDDS and ferrous salt into the non-degradable organic wastewater, adjusting the pH value to be smaller than 7, and then, adding hydrogen peroxide to react. According to the invention, the biodegradable chelating agent EDDS is used for improving a Fenton / Fenton-like oxidization method to treat the non-degradable organic wastewater and can be used for controlling the degradation rate of hydrogen peroxide and simultaneously complexing Fe<2+> and Fe<3+>, so that the utilization ratio of hydrogen peroxide is greatly increased, the consumption of ferrous salt is reduced, the application range of the Fenton / Fenton-like oxidization method in water treatment is widened, and the sewage treatment effect of the Fenton / Fenton-like oxidization method is greatly enhanced.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, in particular to the application of biodegradable chelating agent EDDS in the treatment of refractory organic wastewater, and more specifically to the application of biodegradable chelating agent EDDS in the treatment of refractory organic wastewater by improving Fenton / Fenton-like oxidation method in the application. Background technique [0002] Fenton is one of the few inorganic chemical reactions named after a person. In 1893, chemist Fenton HJ discovered that the mixed solution of hydrogen peroxide and ferrous ions has strong oxidizing properties, and can oxidize many known organic compounds such as carboxylic acids, alcohols, and esters to inorganic states at that time, and the oxidation effect is very good. significantly. However, for more than half a century since then, this oxidizing agent has not received much attention because of its strong oxidizing properties. But in the 1970s,...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 祝建中陈冠寰陈靓曹阳史海波丁莹
Owner HOHAI UNIV
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