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Catalytic ozonation reactor for sewage treatment

A technology for ozone oxidation and sewage treatment, applied in water/sewage treatment, oxidized water/sewage treatment, water/sewage treatment equipment, etc. The problem of high residual ozone concentration in the gas phase can achieve the effect of complete oxidation reaction of organic matter, solve the loss of copper metal, and reduce the probability of free radical recombination

Pending Publication Date: 2021-10-22
大连一名环保科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0007] The technical problems to be solved by the present invention are unreasonable structural design of the existing ozone catalytic reactor, large amount of catalyst filling, complex aeration and backwashing systems, low reaction depth, high residual ozone concentration in the gas phase after the reaction, and heavy metal residues in the effluent, etc. problem, providing an efficient catalytic ozonation reactor for wastewater treatment

Method used

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  • Catalytic ozonation reactor for sewage treatment

Examples

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preparation example Construction

[0024] Preparation of Catalyst A1 (Fe-Ce / Al 2 o 3 )

[0025] The macroporous alumina powder and peptizer are kneaded, rolled, and extruded to make a clover-shaped carrier with a diameter of 2.5 mm, and then calcined at 550 ° C in the air to obtain Al 2 o 3 Carrier, specific surface area 220 m 2 / g, pore volume 0.7 cm 3 / g, the average pore diameter is 10.4nm. Weigh 500g of alumina carrier, according to its water absorption with Fe(NO 3 ) 3 9H 2 O and Ce(NO 3 ) 3 ·6H 2 O by Fe 2 o 3 and CeO 2 Accounting for 5% and 1.5% of the total weight of the catalyst respectively, they are formulated into solutions. The alumina carrier was impregnated with an equal volume of Fe-Ce solution for 2 hours, dried at 80°C, then calcined in a muffle furnace at 550°C for 4 hours, and taken out after the temperature dropped to room temperature to obtain catalyst A1.

[0026] Preparation of Catalyst A2 (Fe-Ce / ZSM-5)

[0027] The diameter is 2.0mm, the specific surface area is 320m 2 / ...

Embodiment 1

[0033] In the tertiary biochemical effluent of an oil refinery sewage treatment plant, COD=56 mg / L, BOD=1 mg / L, SS=8 mg / L, the COD that can be directly oxidized by ozone is 15 mg / L, which can be The COD of further catalytic oxidation was 18 mg / L.

[0034] A sewage treatment ozone catalytic oxidation reactor, such as figure 1 shown. Sewage enters the gas-liquid mixing pump (3) through the water inlet pipe (1), fully mixes and dissolves with the ozone from the ozone generator (2), and then enters the direct ozone oxidation zone (4). The volume of the direct oxidation zone accounts for 1 / 2 of the total volume . During the reaction process, the dosage of ozone is 90 mg / L, and the catalytic oxidation zone (5) is filled with catalyst A1 and catalyst B1 in sequence, and the volume ratio of the two catalysts is 40% and 60%. The space velocity of the reactor is 1.0 h -1 , the air washing intensity during backwashing is 5 L / m 2 s, the washing strength is 4 L / m 2 s, in the process ...

Embodiment 2

[0037] In the secondary biochemical effluent of a chemical sewage treatment plant, COD=65 mg / L, BOD=0.5 mg / L, SS=15 mg / L, the COD that can be directly oxidized by ozone is 12 mg / L, which can be The COD of further catalytic oxidation was 23 mg / L.

[0038] A sewage treatment ozone catalytic oxidation reactor, such as figure 1 shown. Sewage enters the gas-liquid mixing pump (3) through the water inlet pipe (1), fully mixes and dissolves with the ozone from the ozone generator (2), and then enters the ozone direct oxidation zone (4). The volume of the direct oxidation zone accounts for 1 / 3 of the total volume . During the reaction process, the dosage of ozone is 35 mg / L, and the catalytic oxidation zone (5) is filled with catalyst A1 and catalyst B2 in sequence, and the volume ratio of the two catalysts is 50% and 50%. The space velocity of the reactor is 3.0 h -1 , the air washing intensity during backwashing is 15 L / m 2 s, the washing strength is 10 L / m 2 s, in the process...

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Abstract

The invention relates to a catalytic ozonation reactor for sewage treatment, and aims to solve the technical problem that an existing catalytic ozonation reactor is unreasonable in structural design, large in catalyst filling amount, complex in aeration and backwashing system, low in reaction depth, high in concentration of gas-phase residual ozone after reaction and the like. A catalyst supporting grid is designed to divide a reactor into a lower ozone direct oxidation zone and an upper ozone catalytic oxidation zone, and the catalytic oxidation zone is filled with a catalyst A and a catalyst B in sequence. The reactor not only utilizes ozone direct oxidation and free radical indirect oxidation processes, but also utilizes the characteristics of different catalysts to carry out ordered matching, so that the ozone utilization efficiency is improved, the heavy metal content in effluent is reduced, and meanwhile, ozone and sewage are fully mixed by using a gas-liquid mixing pump. According to the scheme, the efficiency problem of an existing ozone reactor is well solved, and the reactor is particularly suitable for advanced treatment of sewage.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a sewage treatment catalytic ozonation reactor. Background technique [0002] In recent years, in order to control the deterioration of the water environment, new discharge standards have been continuously introduced in various places. For example, Beijing's "Water Pollution Comprehensive Discharge Standard" (DB11-307-2013) stipulates that COD (chemical oxygen demand) A-level and B-level discharge limits are respectively 20 mg / L and 30 mg / L; Tianjin Municipal Wastewater Treatment Plant Pollutant Discharge Standards (DB12 / 599-2015) stipulates that the A-level and B-level emission limits of COD are 30 mg / L and 40 mg / L respectively. L. The improvement of sewage discharge standards has given birth to the development of advanced oxidation sewage advanced treatment technology. [0003] Ozone catalytic oxidation is a kind of advanced oxidation technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F101/30
CPCC02F1/78C02F1/725C02F2101/30C02F2201/782C02F2305/023C02F2303/14
Inventor 不公告发明人
Owner 大连一名环保科技有限公司
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