System for removing refractory COD (Chemical Oxygen Demands) and removal method thereof

A refractory and biodegradable technology, applied in the removal of refractory COD system and its removal field, can solve the problems of water pollution, increase the difficulty of system treatment, investment and operation costs, increase the content of salt and iron ion content, and achieve COD treatment High load, high COD removal effect, and stable removal effect

Pending Publication Date: 2018-08-21
易能环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-application COD removal of these technologies is ineffective and often very expensive to operate
Moreover, the Fenton reaction process needs to add a large amount of ferrous sulfate, sulfuric acid and sodium hydroxide, which greatly increases the content of salt and iron ions in the raw water, which is another form of pollution to the water body; many industrial sewage reuse projects Or the zero discharge project itself is for salt removal or salt separation. If a large amount of salt is added to the selection of treatment process, it will greatly increase the processing difficulty, investment and operation cost of the system
Moreover, the Fenton oxidation process will introduce iron salts, and iron salts will also cause irreversible pollution and damage to the reverse osmosis membrane, so Fenton oxidation technology cannot be used in this case
Electrochemical technology also has similar weaknesses to Fenton technology, and because electrochemical technology needs to consume electric energy and has extremely high operating costs, the promotion effect is not good

Method used

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  • System for removing refractory COD (Chemical Oxygen Demands) and removal method thereof
  • System for removing refractory COD (Chemical Oxygen Demands) and removal method thereof
  • System for removing refractory COD (Chemical Oxygen Demands) and removal method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Reverse osmosis concentrated water from a petroleum refinery wastewater advanced treatment process (refractory COD in reverse osmosis concentrated water is converted into oils, polycyclic aromatic hydrocarbons, and aromatic amines):

[0038] The dosage of ozone in the ozone oxidation tank is 126mg / L, and the amount of each gas distribution device in the biological aerated filter is 0.24m 3 / (unit h), the amount of ozone added in the ozone / hydrogen peroxide synergistic oxidation tank is 154mg / L, the amount of hydrogen peroxide added is 105mg / L, the filtration rate of the activated carbon filter is 8m / h, and the residence time is 15min.

[0039] Influent COD=175mg / L sewage enters the ozone oxidation pool, the effective water depth of the ozone oxidation pool is 6m, adopts the vertical flow corridor type, the water inlet is located at the bottom of the first corridor, and the ozone aeration plate is located on the upper part of the water inlet. In the ozone oxidation tank,...

Embodiment 2

[0041] Reverse osmosis concentrated water from a petroleum refinery wastewater advanced treatment process (refractory COD in reverse osmosis concentrated water is converted into oils, polycyclic aromatic hydrocarbons, and aromatic amines):

[0042] The dosage of ozone in the ozone oxidation tank is 120mg / L, and the amount of each gas distribution device in the biological aerated filter is 0.24m 3 / (unit h), the amount of ozone added in the ozone / hydrogen peroxide synergistic oxidation tank is 145mg / L, the amount of hydrogen peroxide added is 100mg / L, the filtration rate of the activated carbon filter is 6m / h, and the residence time is 18min.

[0043] Influent COD=170mg / L sewage enters the ozone oxidation tank, the effective water depth of the ozone oxidation tank is 6m, adopts the vertical flow corridor type, the water inlet is located at the bottom of the first corridor, and the ozone aeration plate is located on the upper part of the water inlet. In the ozone oxidation tank,...

Embodiment 3

[0045] Reverse osmosis concentrated water from a petroleum refinery wastewater advanced treatment process (refractory COD in reverse osmosis concentrated water is converted into oils, polycyclic aromatic hydrocarbons, and aromatic amines):

[0046] The dosage of ozone in the ozone oxidation tank is 135mg / L, and the air distribution volume of each gas distribution device in the biological aerated filter is 0.40m 3 / (unit h), the amount of ozone added in the ozone / hydrogen peroxide synergistic oxidation tank is 160mg / L, the amount of hydrogen peroxide added is 110mg / L, the filtration rate of the activated carbon filter is 10m / h, and the residence time is 12min.

[0047] Influent COD=180mg / L sewage enters the ozone oxidation tank, the effective water depth of the ozone oxidation tank is 6m, adopts vertical flow corridor type, the water inlet is located at the bottom of the first corridor, and the ozone aeration plate is located on the upper part of the water inlet. In the ozone o...

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Abstract

The invention discloses a system for removing refractory COD (Chemical Oxygen Demands) and a removal method thereof. The system mainly comprises an ozone oxidation pool, a biological aerated filter, an ozone / hydrogen peroxide synergetic oxidation pool and an activated carbon filter. The method for removing refractory COD comprises the following specific steps: 1) performing ozone oxidation; 2) performing biodegradation; 3) performing synergistic oxidation; 4) performing activated carbon filtration. According to the system and method in the invention, the final products in the ozone oxidation and ozone / hydrogen peroxide oxidation process are carbon dioxide and water, secondary pollution is not brought to raw water in the oxidation process, fouling risk is not brought to a reverse osmosis process, and the treatment difficulty of a reverse osmosis system is not increased.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a system and a method for removing refractory COD. Background technique [0002] With the continuous improvement of the effluent standards of municipal sewage treatment plants, for example, the effluent requirements meet the water quality requirements of Class III water bodies in the "Environmental Quality Standards for Surface Water of the People's Republic of China (GB3838-2002)", and the water quality requirements of Class III water bodies for surface water COD≤20mg / L At present, most of the municipal sewage treatment plants in my country implement the first-level B or first-level A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants (GB 18918-2002)", where the first-level B requires that the effluent COD≤60mg / L , Grade A requires effluent COD≤50mg / L. [0003] In industrial sewage reuse projects, the reverse osmosis process is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F9/00C02F2209/08C02F2201/784C02F2203/006C02F2301/08C02F1/283C02F1/001C02F3/02C02F1/78C02F3/10C02F1/722
Inventor 周宬张庆程国际陈光杨菲红尹道三
Owner 易能环境技术有限公司
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