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A method for advanced treatment of sewage after ozone reflux secondary oxidation

A technology of ozone oxidation and secondary oxidation, applied in the direction of oxidized water/sewage treatment, multi-stage water/sewage treatment, degassed water/sewage treatment, etc. Membrane difficulties, high investment and operating costs, etc., to achieve the effect of low construction and operating costs, efficient and stable operation, and flexible operation

Active Publication Date: 2018-09-18
北京翰祺环境技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process effectively improves the utilization rate of ozone, improves the selectivity of ozone oxidation, and has high COD removal efficiency. However, the two processes of ozone and biological filter are synergistic, and blindly improving the COD removal rate of ozone oxidation will lead to aerated organisms. It is difficult to hang film in the filter, which reduces the total removal rate of the overall process, etc.
In addition, due to the addition of catalysts in this process, backwashing and filler replacement are required, the equipment is complex, the operating procedures are complex, and the investment and operating costs are high. At the same time, the process generates solid waste, which requires solid waste treatment

Method used

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  • A method for advanced treatment of sewage after ozone reflux secondary oxidation
  • A method for advanced treatment of sewage after ozone reflux secondary oxidation
  • A method for advanced treatment of sewage after ozone reflux secondary oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw water sample for the pilot test is the effluent from the secondary settling tank of the sewage treatment plant of a refining and chemical enterprise. The water quality and quantity are as follows:

[0025]

[0026] Raw water first enters the former ozone oxidation tank B, stays for 45min, and the ozone produced by the ozone generator A is added to the former ozone oxidation tank B through the ozone dosing pipeline 2, and the ozone dosage is 2kgO 3 / kgCOD, the COD removal rate of ozone oxidation before control is 35%. The effluent from the front ozone oxidation pool B enters the BAF pool C through channels, and the filtration rate of the BAF pool is controlled at 4m / h. Take 25%, 50%, 75%, 100% respectively, stay for 45min, and then add 2kgO 3 / kgCOD, the COD removal rate of ozone oxidation after control is 35%. The effluent from the ozone oxidation tank E is sent back to the BAF tank C for further processing.

[0027] The COD removal rate of the whole proce...

Embodiment 2

[0032] Guarantee that other conditions are constant among the embodiment 1, rear ozone dosage is 2.5kgO 3 / kgCOD, the COD removal rate of ozone oxidation after control is 50%.

[0033] The COD removal rate of the whole process sewage is as follows:

[0034]

[0035] When the reflux ratio is 25%, 50%, 75%, and 100%, the highest COD removal rate of the whole process is 61%, 64.5%, 67.2%, and 69.3%.

[0036] When the COD removal rate of post-ozone oxidation is increased, the total COD removal rate of the overall process is significantly improved. Similarly, the higher the reflux ratio, the higher the COD removal rate.

Embodiment 3

[0038] Keep other conditions unchanged in Example 1, cancel the rear ozone oxidation pool E, and part of the sewage in the clear water pool directly returns to the front ozone oxidation pool B.

[0039] The COD removal rate of the whole process sewage is as follows:

[0040]

[0041] When the reflux ratio is 25%, 50%, 75%, and 100%, the highest COD removal rate of the whole process is 61%, 63%, 64%, and 64.8%.

[0042] When the total ozone dosage is the same, it has the same effect as in Example 1 when only increasing the reflux without the post-ozone oxidation pool.

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PUM

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Abstract

The invention discloses a wastewater advanced treatment method using post-ozonation reflux and secondary oxidation. The wastewater advanced treatment method is characterized in that a post-ozonation reflux technology is added on the basis of a traditional ozone and biofilter combined process, and a reflux ratio is reasonably designed, so that the removing efficiency of COD (Chemical Oxygen Demand) in biorefractory wastewater is further improved, and the problem that the removing efficiency of the COD by a first-stage ozone and biofilter combined process is limited is effectively solved. The method comprises the following steps of firstly, allowing wastewater subjected to secondary treatment to enter into a front ozone oxidation pond, and feeding ozone to improve the biodegradability of the wastewater; secondly, allowing effluent from the front ozone oxidation pond to enter into a BAF (Biological Aerated Filter) for biological treatment, and enabling drained water to enter into a clean water basin; thirdly, elevating part of the wastewater in the clean water basin to enter into a rear ozone oxidation pond, and performing ring opening and chain scission by ozone oxidation again; fourthly, refluxing effluent from the rear ozone oxidation pond to the BAF, and jointly performing biological treatment on the effluent from the rear ozone oxidation pond and the effluent from the front ozone oxidation pond. According to the method disclosed by the invention, the selectivity of ozone oxidation is fully utilized, and the biochemical limit of hard biodegradable wastewater is broken through.

Description

technical field [0001] The invention relates to a sewage advanced treatment method for post-ozone reflux secondary oxidation. Background technique [0002] Most of the easily degradable organic pollutants in refining wastewater can be removed through secondary treatment, but it is difficult to remove refractory organics such as double bonds, benzene rings, and polycyclic aromatic hydrocarbons. The COD concentration in the secondary effluent is still high, and B / C Low ratio, poor biodegradability. With the continuous improvement of my country's sewage discharge standards, at present, the following two methods are usually used in China as advanced treatment to remove refractory organic matter. [0003] The first one is the combined process of ozone oxidation and biological aerated filter. This process can further reduce the COD concentration in sewage, but due to the selectivity of ozone oxidation, the ability to increase the B / C ratio of sewage is limited, resulting in a li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/20C02F1/78C02F3/00C02F9/00C02F2101/327C02F2301/08
Inventor 王晓阳崔慧慧杨权闫清云袁志丹
Owner 北京翰祺环境技术股份有限公司
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