Process for treating high-concentration organic wastewater by wet catalytic oxidation

A technology of organic wastewater and catalytic wet oxidation, which is applied in the direction of oxidized water/sewage treatment, etc., to reduce the energy consumption of the process and improve the efficiency of wastewater treatment.

Active Publication Date: 2019-06-04
山西中科国蕴环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Process for treating high-concentration organic wastewater by wet catalytic oxidation
  • Process for treating high-concentration organic wastewater by wet catalytic oxidation

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Embodiment 1

[0019] The catalyst (Pd-Ag-Zn / TiO 2 , where Pd accounts for 0.44wt%, Ag accounts for 1.5wt%, Zn accounts for 0.35wt%, TiO 2 Accounting for 97.71wt%) 4ml was filled in the fixed bed reactor. The COD content of the wastewater is 10000mg / L, and the space velocity is 0.5h -1 , given that the space velocity of oxygen-enriched gas is 34 times the space velocity of wastewater (16.8h -1 ), the oxygen concentration is 1.2 times of the theoretical oxygen demand, and the oxygen generating device automatically adjusts the oxygen concentration to 25%. The waste water is mixed with oxygen-enriched gas and enters the heat exchanger. After heat exchange, the gas-liquid mixture is sent to the waste water reactor for reaction at 250°C and 6.0 MPa; the water vapor after the oxidation reaction first passes through the heat exchanger and then water-cooled The temperature of the device is cooled, and then sent to the gas-liquid separation tank for gas-liquid separation, the treated water is dire...

Embodiment 2

[0021]The catalyst of Example 5 in CN201810389974.1 (Ru-Ag-La / molecular sieve, wherein Ru accounts for 0.3wt%, Ag accounts for 0.9wt%, La accounts for 0.05wt%, molecular sieve accounts for 98.75wt%) 4ml is packed in fixed bed reaction inside the device. The COD content of the wastewater is 30000mg / L, and the space velocity is 1h -1 , given that the space velocity of oxygen-enriched gas is 35 times the space velocity of wastewater (35h -1 ), the oxygen concentration is 1.15 times of the theoretical oxygen demand, and the oxygen generating device automatically adjusts the oxygen concentration to 69%. The waste water is mixed with oxygen-enriched gas and enters the heat exchanger. After heat exchange, the gas-liquid mixture is sent to the waste water reactor for reaction at 200°C and 5.0 MPa; the water vapor after the oxidation reaction first passes through the heat exchanger and then water-cooled After cooling down, it is sent to the gas-liquid separation tank for gas-liquid s...

Embodiment 3

[0023] The catalyst (Au-Ag-Mo / ZrO 2 , where Au accounts for 0.4wt%, Ag accounts for 1.2wt%, Mo accounts for 0.5wt%, ZrO 2 Accounting for 97.9wt%) 4ml was filled in the fixed bed reactor. The COD content of the wastewater is 20000mg / L, and the space velocity is 1.5h -1 , given that the space velocity of oxygen-enriched gas is 36 times the space velocity of wastewater (54h -1 ), the oxygen concentration is 1.2 times of the theoretical oxygen demand, and the oxygen generating device automatically adjusts the oxygen concentration to 47%. The waste water is mixed with oxygen-enriched gas and enters the heat exchanger. After heat exchange, the gas-liquid mixture is sent to the waste water reactor for reaction at 210°C and 4.0 MPa; the water vapor after the oxidation reaction first passes through the heat exchanger and then water-cooled After cooling down, it is sent to the gas-liquid separation tank for gas-liquid separation; the treated water is sent to the next treatment sectio...

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Abstract

A process for treating high-concentration organic wastewater by wet catalytic oxidation is disclosed. According to the process, COD concentration online detection is automatically associated with an oxygen concentration adjusting device; organic wastewater with COD content being 10000-50000 mg / L and wastewater liquid space velocity being 0.5-2.5 h<-1> is mixed with oxygen-enriched gas; the space velocity of the oxygen-enriched gas is 34-39 times higher than the space velocity of the wastewater liquid; the oxygen supply is 1.1-1.2 times higher than the theoretical oxygen demand; the device automatically adjust the volume concentration of oxygen to 25-99%; water obtained after reaction in a wastewater reactor with a catalyst is directly discharged or send to the next treatment section; and tail gas containing nitrogen, oxygen, carbon dioxide and water vapor is directly discharged into the atmosphere. The invention has the advantage of effectively removing high-concentration COD in acidicor alkaline organic wastewater.

Description

technical field [0001] The invention relates to a process for catalytic wet oxidation treatment of high-concentration organic wastewater, in particular to a process for catalytic wet oxidation treatment of organic wastewater containing high concentrations of COD and ammonia nitrogen. Background technique [0002] High-concentration organic wastewater mainly comes from the production processes of coal chemical industry, pharmaceuticals, papermaking, printing and dyeing, etc. Its remarkable characteristics are "four highs", that is, high COD (oil, phenols, polycyclic aromatic hydrocarbons), high ammonia nitrogen, and high chroma , high inorganic pollutants (sulfide, cyanide, salt), etc. High-concentration organic wastewater contains a large amount of biodegradable substances and toxic substances, which will seriously impact and poison microorganisms, resulting in the loss of activation ability of microorganisms. Improper treatment of high-concentration organic wastewater has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
Inventor 李德宝肖勇侯博鲁怀乾贾丽涛
Owner 山西中科国蕴环保科技有限公司
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