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Method for treating sewage through catalytic oxidation

A technology for catalytic oxidation and wastewater treatment, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc. It can solve problems affecting the effect of catalytic oxidation reactions, achieve good social benefits, and reduce consumption , cost reduction effect

Inactive Publication Date: 2011-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, since a large number of ferric ions (usually expressed as Fe(III)) form iron hydroxide precipitation in water, which affects the reaction effect of catalytic oxidation, a large amount of catalyst needs to be added to ensure the reaction effect , and the increase in catalyst dosage will lead to more precipitation

Method used

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Examples

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Effect test

Embodiment 1

[0032] To treat the biochemical effluent of an oil refinery, H 2 o 2 as an oxidizing agent, Fe 2 SO 4 as a catalyst, ethylenediaminetetraacetic acid as a complexing agent, and the acid-base used is concentrated H 2 SO 4 and NaOH. The operating conditions are determined as: H 2 o 2 / Wastewater COD mass concentration ratio 1:4, H 2 o 2 with Fe 2+ The molar concentration ratio is 2:1, complexing agent and Fe 2+ The molar ratio is 1:1; the pH of the oxidation reaction tank is 5, the pH of the sedimentation tank is 6.5, the residence time of the oxidation reaction tank is 30 minutes, and the residence time of the sedimentation tank is 1 hour. See Table 1 for the data comparison between the catalytic oxidation treatment method of the present invention and the traditional catalytic oxidation treatment method for wastewater treatment. The results in Table 1 show that waste residue and catalyst consumption are significantly reduced by adopting the method of the present inven...

Embodiment 2

[0037] To treat high-concentration wastewater from a chemical plant, H 2 o 2 as an oxidizing agent, Fe 2 SO 4 as a catalyst, oxalic acid as a complexing agent, and the acid-base used is concentrated H 2 SO 4 and NaOH. The operating conditions are determined as: H 2 o 2 / COD mass concentration ratio of wastewater 1:8, H 2 o 2 with Fe 2+ The molar concentration ratio is 1:1, complexing agent and Fe 2+ The mol ratio is 1: 2; the pH of the oxidation reaction tank is 6, the pH of the sedimentation tank is 6.5, the residence time of the oxidation reaction tank is 40 minutes, and the residence time of the sedimentation tank is 1 hour, adopting the catalytic oxidation treatment method of the present invention and the traditional catalytic oxidation treatment See Table 2 for the data comparison of wastewater treated by the method. The results in Table 2 show that waste residue and catalyst consumption are significantly reduced by adopting the method of the present invention...

Embodiment 3

[0042] Treatment of saline wastewater from a factory, using sodium hypochlorite as oxidant, Fe 2 SO 4 As a catalyst, citric acid is a complexing agent, and the acid-base used is concentrated H 2 SO 4 and NaOH. The operating conditions are determined as: H 2 o 2 The mass concentration ratio of COD / wastewater is 1:5, the oxidant and Fe2+ The molar concentration ratio is 3:1; complexing agent and Fe 2+ The mol ratio is 1: 2; the pH of the oxidation reaction tank is 4, and the pH of the sedimentation tank is 6.5; the residence time of the oxidation reaction tank is 30 minutes, and the residence time of the sedimentation tank is 1 hour, using the catalytic oxidation treatment method of the present invention and the traditional catalytic oxidation treatment See Table 3 for the data comparison of wastewater treated by the method. The results in Table 3 show that waste residue and catalyst consumption are significantly reduced by adopting the method of the present invention to t...

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PUM

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Abstract

The invention relates to a method for treating sewage through catalytic oxidation, which comprises the following steps of: introducing sewage to be treated into an oxidation reactor, controlling the pH value of the sewage to be less than 7, adding an oxidant, a catalyst and a complexant for performing a catalytic oxidation reaction, and separating sewage and waste residues obtained after the reaction. The complexant is an organic acid metal complexant. The addition of the complexant in the invention enables iron ions and the complexant to produce a complex compound so as to reduce the generation of iron hydroxide precipitates, and thus, more iron ions can participate in the catalytic oxidation process. The utilization efficiency of the catalyst is increased, the consumption of the catalyst can be reduced, and simultaneously, the generation of waste residues can be reduced.

Description

technical field [0001] The invention relates to a catalytic oxidation treatment method for sewage treatment, in particular to a catalytic oxidation treatment method for treatment of refractory wastewater. Background technique [0002] For a long time, the treatment of refractory organic wastewater in the environment has always been a difficult point in water treatment technology, and it is also an important problem that plagues the environmental circles all over the world. [0003] In recent years, the advanced oxidation technology represented by catalytic oxidation has made remarkable progress in the treatment of refractory organic wastewater. The mechanism of catalytic oxidation is to use a catalyst to combine with an oxidant to generate highly active free radicals (such as OH) in the reaction; The macromolecular refractory organic matter in the water body is oxidatively degraded into small molecular substances that are easily biodegradable, and even directly degraded int...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/76C02F1/78C02F1/66C02F1/52
Inventor 高峰张利强张莉
Owner CHINA PETROLEUM & CHEM CORP
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