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Method for treating wastewater by combining catalytic oxidation with biological aerated filter

A biological aerated filter and catalytic oxidation technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of industrial application limitations, large acid and alkali consumption, etc., and achieve reduction Acid and alkali consumption, reduction of treatment cost, effect of cost reduction

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned method still has problems such as large consumption of acid and alkali, which limits industrial application.

Method used

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  • Method for treating wastewater by combining catalytic oxidation with biological aerated filter

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Embodiment 1

[0030] To treat the non-standard effluent of an oil refinery, H 2 o 2 as an oxidizing agent, Fe 2 SO 4 As a catalyst, the acid and base used are concentrated H 2 SO 4 and NaOH. The operating conditions are: H 2 o 2 The ratio to the mass concentration of organic matter (COD) in wastewater is 1:3, H 2 o 2 / Fe 2+ The molar ratio is 1:2, the pH of the oxidation tank is 3, the pH of the supernatant of the sedimentation tank is 7, the pH of the dissolution tank is 0.3, the residence time of wastewater in the flocculation tank is 1 hour, the residence time of the oxidation tank is 60 minutes, and the residence time of the sedimentation tank is 1 hour. The time is 2 hours, and the residence time of the biological aerated filter is 4 hours. See Table 1 for the processing results. From the data in Table 1, it can be seen that after the wastewater is treated by catalytic oxidation, the COD and oil content are greatly reduced, and the biodegradability is significantly improved....

Embodiment 2

[0034] For the pretreatment of reverse osmosis influent water in the process of wastewater reuse in a refinery, H 2 o 2 as an oxidizing agent, Fe 2 SO 4 As a catalyst, the acid and base used are concentrated H 2 SO 4 and NaOH. The operating conditions are determined as: H 2 o 2 The ratio to the mass concentration of organic matter (COD) in wastewater is 1:2, H 2 o 2 / Fe 2+ The molar ratio is 1:1, the pH of the oxidation tank is 5, the pH of the supernatant of the sedimentation tank is 6.5, the pH of the dissolution tank is 0.5, the residence time of wastewater in the flocculation tank is 1 hour, the residence time of the oxidation tank is 40 minutes, and the residence time of the sedimentation tank is 1.5 hours, the residence time of biological aerated filter is 3 hours. From the data in Table 1, it can be seen that after the wastewater is treated by catalytic oxidation, the COD is greatly reduced, and the biodegradability is significantly improved. After the BAF tre...

Embodiment 3

[0038] Sodium hypochlorite was used as the oxidant to treat the unqualified wastewater discharged from a chemical plant, and Fe 2 SO 4 As a catalyst, the acid and base used are concentrated H 2 SO 4 and NaOH. The operating conditions are: the ratio of the mass concentration of sodium hypochlorite to the organic matter (COD) in the wastewater is 1:3, and the sodium hypochlorite / Fe 2+ The molar ratio is 1:1.5, the pH of the oxidation tank is 4, the pH of the supernatant of the sedimentation tank is 7.5, the pH of the dissolution tank is 0.3, the residence time of wastewater in the flocculation tank is 1 hour, the residence time of the oxidation tank is 60 minutes, and the residence time of the sedimentation tank is 1 hour. The time is 2 hours, and the residence time of the biological aerated filter is 4 hours. See Table 3 for the processing results. From the data in Table 3, it can be seen that after the wastewater is treated by catalytic oxidation, the COD and oil content ...

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Abstract

The invention relates to a method for treating wastewater by combining catalytic oxidation with a biological aerated filter, which sequentially comprises the following steps of: 1) adding all or part of the wastewater to be treated into a flocculating tank, performing flocculation sedimentation, and adding into an oxidation tank; 2) adding acid into the oxidation tank to regulate the pH value of the wastewater to be 0 to 6, adding an oxidant and a catalyst and performing catalytic oxidation reaction; and 3) adding the oxidized wastewater into a settling tank for settling, discharging supernatant, adding alkali to regulate the pH value to be 6 to 9, adding into the biological aerated filter for treating, and discharging; and making settled acidic sediments flow back to a dissolving tank, adding the acid to regulate the pH value until the sediments are completely dissolved, adding solution into the flocculating tank and performing flocculation sedimentation reaction on the solution and all or part of the wastewater to be treated. Compared with the prior art, the method reduces the consumption of the acid and the alkali and treatment cost.

Description

technical field [0001] The invention relates to a method for wastewater treatment. Background technique [0002] With the process of industrialization and urbanization in our country, a large number of industrial and domestic pollutants are discharged into the environment, which brings more and more serious pollution to water bodies. The deteriorating water quality not only causes water shortage in many areas, but also increases the cost of obtaining water resources for the whole society. What is more serious is that it endangers people's health. Therefore, it is necessary to treat the wastewater containing pollutants so that it can be discharged up to the standard . With the continuous development of water treatment technology, most of the wastewater can be treated, but for a long time, the treatment of organic wastewater with poor biodegradability in the environment has always been a difficult point in water treatment technology, and it is also an important problem that p...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52C02F1/66C02F1/72C02F1/76C02F1/78C02F3/12
CPCY02W10/10
Inventor 高峰桑军强李本高
Owner CHINA PETROLEUM & CHEM CORP
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