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Catalytic oxidation method capable of recycling waste residues

A catalytic oxidation and waste residue technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. Cost, environmental protection, effect of reducing emissions

Active Publication Date: 2010-03-03
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, the catalytic oxidation uses Fe 2+ Ions act as catalysts, during the reaction Fe 2+ ions are oxidized to Fe 3+ After the production, iron hydroxide precipitates are formed. Due to the catalytic oxidation of wastewater, especially in the process of treating high-concentration refractory wastewater, Fe 2+ The amount of ions used is large, resulting in more ferric hydroxide waste residues, and these waste residues are difficult to handle, which limits the industrial application of catalytic oxidation. The amount of waste residue produced makes catalytic oxidation technology more widely used in industry

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  • Catalytic oxidation method capable of recycling waste residues

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Embodiment 1

[0026] To treat non-compliant wastewater discharged from a refinery, use H 2 O 2 As oxidant, Fe 2 SO 4 As a catalyst, iron filings as a reducing agent, and the acid and alkali used are concentrated H 2 SO 4 And NaOH. The operating conditions are determined as: H 2 O 2 / COD mass concentration ratio of wastewater 1:3, H 2 O 2 With Fe 2+ The molar concentration ratio is 1:2, reducing agent and Fe 3+ The molar ratio of the oxidation reaction tank is 1:1; the pH of the oxidation reaction tank is 3, the pH of the reduction reaction tank is 1, the pH of the sedimentation tank is 6.5, the residence time of the oxidation reaction tank is 30 minutes, the residence time of the sedimentation tank is 1 hour, and the residence time of the reduction tank is 20 Minutes; reducing agent and Fe 3+ The molar concentration ratio is 1:1. Table 1 shows the comparison of the data of the catalytic oxidation treatment method of the present invention and the traditional catalytic oxidation treatment metho...

Embodiment 2

[0031] To treat wastewater from a chemical fiber plant, use H 2 O 2 As oxidant, Fe 2 SO 4 Is a catalyst, sodium bisulfite is a reducing 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 1:10, H 2 O 2 With Fe 2+ The molar concentration ratio is 1:1, reducing agent and Fe 3+ The molar ratio of the oxidation reaction tank is 1:1; the pH of the oxidation reaction tank is 5, the pH of the sedimentation tank is 6.5, and the pH of the reduction reaction tank is 1.5; the residence time of the oxidation reaction tank is 30 minutes, the residence time of the sedimentation tank is 1 hour, and the residence time of the reduction tank is 30 minute. Table 2 shows the comparison of the data of the waste water treatment by the catalytic oxidation treatment method of the present invention and the traditional catalytic oxidation treatment method. The results in Table 2 show that the use...

Embodiment 3

[0036] To treat wastewater from a pharmaceutical factory, using sodium hypochlorite as the oxidant, Fe 2 SO 4 As a catalyst, sodium dithionite as a reducing agent, and the acid and alkali used are concentrated H 2 SO 4 And NaOH. The operating conditions are determined as: H 2 O 2 / COD mass concentration ratio of waste water 1:5, oxidant and Fe 2+ The molar concentration ratio is 1:3; the pH of the oxidation reaction tank is 3, the pH of the sedimentation tank is 6.5, and the pH of the reduction reaction tank is 1.2; the residence time of the oxidation reaction tank is 30 minutes, the residence time of the sedimentation tank is 1 hour, and the residence time of the reduction tank is 30 minute. Table 2 shows the comparison of the data of the waste water treatment by the catalytic oxidation treatment method of the present invention and the traditional catalytic oxidation treatment method. The results in Table 3 show that the waste residue and catalyst usage are significantly reduc...

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Abstract

The invention discloses a catalytic oxidation method capable of recycling waste residues, which comprises (1) delivering wastewater to be treated into an oxidation reactor, adding an acid to adjust the pH value of the wastewater and adding an oxidizer and ferrous iron ions (Fe<2+>) serving as a catalyst to perform catalytic oxidation reaction; (2) adding an alkali into the wastewater obtained after the completion of the reaction to adjust the pH value of the wastewater, and delivering the wastewater to a settling basin for flocculating setting; (3) after the completion of the settling, discharging supernatant, delivering the settled waste residues into a reduction reactor, adding an acid into the waste residues to adjust the pH value of the waste residues, dissolving the waste residues toform solution containing ferric ion (Fe<3+>), and adding a reducer to reduce the Fe<3+> into Fe<2+> at the same time; and (4) circulating the reduced solution containing the Fe<2+> to an oxidation reactor to use the solution as a catalyst to perform the catalytic oxidation reaction. Compared with the conventional catalytic oxidation, the method reduces the discharge of waste iron residues, reducesthe waste iron residue treatment cost, protects environment, reduces the usage amount of the catalyst in a catalytic oxidation process and saves resources.

Description

Technical field [0001] The invention relates to a catalytic oxidation treatment method for sewage treatment, in particular to a method for recycling waste residues generated in the process of catalytic oxidation treatment of wastewater. Background technique [0002] For a long time, the treatment of organic wastewater with low B / C ratio in the environment has always been a difficulty in water treatment technology, and it is also an important problem that plagues the environmental circles of all countries in the world. Due to the low B / C ratio and poor biodegradability of this type of wastewater, it is difficult to directly treat it by biochemical methods. It is basically ineffective to treat through conventional methods such as ordinary filtration and flocculation, and the cost of advanced treatment technologies such as activated carbon adsorption is too high. Separation technology also has certain difficulties in application due to practical problems such as expensive investment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/66C02F1/52C02F1/70
Inventor 高峰马欣桑军强李本高张莉张利强
Owner CHINA PETROLEUM & CHEM CORP
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