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Method for pre-degrading high-concentration oil refining organic wastewater by synergism of sulfuric acid free radical and anodic oxidation

A technology of organic wastewater and anodizing, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc. biochemical effects

Inactive Publication Date: 2013-03-06
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, oil refineries use oxidation and other pretreatment processes for high-concentration wastewater before entering the biochemical system. However, it is difficult for the discharged wastewater after biochemical treatment to meet the standard. These wastewater that does not meet the standard are usually BOD 5 The / COD value is low and the biodegradability is very poor. It is not suitable to use biochemical methods for advanced treatment of these wastewaters; conventional methods such as ordinary filtration and flocculation are basically ineffective; some advanced oxidation technologies such as TiO 2 The treatment effect of photocatalytic method and ozone oxidation method is still in the research and development stage
Most enterprises can only meet the discharge requirements by mixing clean water or other reclaimed water, resulting in a huge waste of water resources

Method used

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  • Method for pre-degrading high-concentration oil refining organic wastewater by synergism of sulfuric acid free radical and anodic oxidation
  • Method for pre-degrading high-concentration oil refining organic wastewater by synergism of sulfuric acid free radical and anodic oxidation
  • Method for pre-degrading high-concentration oil refining organic wastewater by synergism of sulfuric acid free radical and anodic oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Building an electrolytic cell: Anode: Ti / SnO 2 -Sb-pt oxide electrodes (1cm 2 )

[0030] Cathode: graphite (surface area 50cm 2 )

[0031] Cathode and anode spacing: 5cm

[0032] The volume ratio of cathode and anode area: 1:3

[0033] Intermediate diaphragm: PTFE cationic membrane

[0034] After the alkali-containing wastewater from a refinery is treated once by this process, the water quality before and after treatment is shown in Table 1 and Table 2. Specific process conditions:

[0035] (1) Add wastewater to be degraded into the electrolytic cell, add Na 2 SO 4 , so that the concentration reaches 0.3mol / L, adjust the pH=4~5, turn on the power for electrolysis, and generate HSO in the system while the wastewater is degraded 5 - and S 2 o 8 2- ;

[0036] (2) Sampling and determination of organic matter and S 2 o 8 2- concentration;

[0037] (3) S 2 o 8 2- When the concentration reaches 10mmol / L, the waste water is put into the reaction tank 3, and t...

Embodiment 2

[0044] Building an electrolytic cell: Anode: Ti / SnO 2 -Sb-pt oxide electrodes (1cm 2 )

[0045] Cathode: graphite (surface area 50cm 2 )

[0046] Cathode and anode spacing: 5cm

[0047] The volume ratio of cathode and anode area: 1:3

[0048] Intermediate diaphragm: PTFE cationic membrane

[0049] After the wastewater from an oil refinery is treated once by this process, the water quality before and after treatment is shown in Table 3 and Table 4. Specific process conditions:

[0050] (1) Add wastewater to be degraded into the electrolytic cell, add Na 2 SO 4 , so that the concentration reaches 0.5mol / L, adjust the pH=4~5, turn on the power for electrolysis, and generate HSO in the system while the wastewater is degraded 5 - and S 2 o 8 2- ;

[0051] (2) Sampling and determination of organic matter and S 2 o 8 2- concentration;

[0052] (3) S 2 o 8 2- When the concentration reaches 10mmol / L, the waste water is put into the reaction tank 3, and the catalyst...

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Abstract

The invention discloses a method for pre-degrading organic high-concentration oil refining organic wastewater by synergism of sulfuric acid free radical and anodic oxidation. The method comprising the following steps: building an electrolytic cell by taking a Ti / SnO2-Sb-Pt oxide electrode as an anode; adding wastewater to be degraded and SO4<2->; switching on a power supply for electrolysis; while the wastewater is degraded, generating HSO5<-> and S2O8<2-> in a system; sampling and measuring the concentration of S2O8<2-> every 10 minutes; when the concentration of S2O8<2-> reaches a certain degree, filling the wastewater into a reaction tank; and adding catalysts Fe<2+> and Co<2+> to catalyze the generation of the sulfuric acid free radical so as to further degrade the wastewater. With the method, the sulfuric acid free radical and the anodic oxidation are organically combined, and a sulfate radical serves as an auxiliary electrolyte, HSO5<-> and S2O8<2-> can be automatically generated in the system while the wastewater is oxidized and degraded in an anodic area; and then the catalysts are added to catalyze the generation of the sulfuric acid free radical, thereby degrading organic matters in oil refining wastewater, which are difficult to degrade, and improving the biological property of the wastewater.

Description

technical field [0001] The invention belongs to the application field of advanced oxidation technology and water treatment technology, and specifically relates to a water treatment method combining anodic oxidation and sulfuric acid free radical oxidation, which is suitable for pretreatment of high-concentration organic wastewater in oil refineries. Background technique [0002] At present, oil refineries use oxidation and other pretreatment processes for high-concentration wastewater before entering the biochemical system. However, it is difficult for the discharged wastewater after biochemical treatment to meet the standard. These wastewater that does not meet the standard are usually BOD 5 The / COD value is low and the biodegradability is very poor. It is not suitable to use biochemical methods for advanced treatment of these wastewaters; conventional methods such as ordinary filtration and flocculation are basically ineffective; some advanced oxidation technologies such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/72
Inventor 张乃东栾万利朱正江
Owner DALIAN MARITIME UNIVERSITY
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