Technology of treating high-concentration organic wastewater with wet type catalytic oxidation

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

Inactive Publication Date: 2019-03-12
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Technology of treating high-concentration organic wastewater with wet type catalytic oxidation

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[0018] Example 1:

[0019] The catalyst of Example 3 in CN201810389974.1 (Pd-Ag-Zn / TiO 2 , In which Pd accounts for 0.44wt%, Ag accounts for 1.5wt%, Zn accounts for 0.35wt%, TiO 2 (Accounting for 97.71wt%) 4ml is packed in the fixed bed reactor. The COD content of wastewater is 10000mg / L, and the space velocity is 0.5h -1 , The given oxygen-enriched gas space velocity is 34 times the waste water space velocity (16.8h -1 ). The oxygen concentration is 1.2 times the theoretical oxygen demand, and the oxygen generator automatically adjusts the oxygen concentration to 25%. The waste water is mixed with oxygen-enriched gas and then enters the heat exchanger. After the heat exchange, the gas-liquid mixture is sent to the waste water reactor and reacted under the conditions of 250℃ and 6.0MPa; the water vapor after the oxidation reaction first passes through the heat exchanger and then water cooling After cooling, it is sent to the gas-liquid separation tank for gas-liquid separation. T...

Example Embodiment

[0020] Example 2:

[0021] 4ml of the catalyst of Example 5 in CN201810389974.1 (Ru-Ag-La / molecular sieve, where Ru accounted for 0.3 wt%, Ag accounted for 0.9 wt%, La accounted for 0.05 wt%, and molecular sieve accounted for 98.75 wt%) was packed in a fixed bed for reaction. 器内。 In the device. The COD content of wastewater is 30000mg / L, and the space velocity is 1h -1 , The given oxygen-enriched gas space velocity is 35 times the waste water space velocity (35h -1 ). The oxygen concentration is 1.15 times the theoretical oxygen demand, and the oxygen generator automatically adjusts the oxygen concentration to 69%. The waste water is mixed with oxygen-enriched gas and then enters the heat exchanger. After the heat exchange, the gas-liquid mixture is sent to the waste water reactor and reacted under the conditions of 200℃ and 5.0MPa; the water vapor after the oxidation reaction passes through the heat exchanger first, and then is cooled by water After cooling, it is sent to the ga...

Example Embodiment

[0022] Example 3:

[0023] The catalyst of Example 7 in CN201810389974.1 (Au-Ag-Mo / ZrO 2 , Among which Au accounts for 0.4wt%, Ag accounts for 1.2wt%, Mo accounts for 0.5wt%, ZrO 2 (Accounting for 97.9 wt%) 4ml is packed in the fixed bed reactor. The COD content of wastewater is 20000mg / L, and the space velocity is 1.5h -1 , The given oxygen-enriched gas space velocity is 36 times (54h -1 ). The oxygen concentration is 1.2 times the theoretical oxygen demand, and the oxygen generator automatically adjusts the oxygen concentration to 47%. The waste water is mixed with oxygen-enriched gas and then enters the heat exchanger. After the heat exchange, the gas-liquid mixture is sent to the waste water reactor and reacted at 210°C and 4.0MPa; the water vapor after the oxidation reaction first passes through the heat exchanger and then water cooling After cooling, it is sent to the gas-liquid separation tank for gas-liquid separation; the treated water is sent to the next treatment secti...

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Abstract

The invention discloses a technology of treating high-concentration organic wastewater with wet type catalytic oxidation. The technology comprises the following steps that the technology adopts COD concentration online detection and is automatically correlated to an oxygen concentration regulation device, organic wastewater with the COD content being 10000-50000 mg/L and the liquid space velocityof the wastewater being 0.5-2.5 h<-1> is mixed with enriched oxygen, the device automatically regulates the oxygen volume concentration to be 25-99 percent, water which is sent into a wastewater reactor charged with a catalyst for treatment is directly discharged or sent to a next treatment work section, and tail gas containing nitrogen, oxygen, carbon dioxide and water vapor is directly exhaustedto atmosphere, wherein the space velocity of the enriched oxygen is 34-39 times the liquid space velocity of the wastewater, and the oxygen supply quantity is 1.1-1.2 times the theoretical oxygen demand. The technology disclosed by the invention has the advantages that high-concentration COD in acid or alkaline organic wastewater can be effectively removed.

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 ...

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Application Information

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IPC IPC(8): C02F1/72
CPCC02F1/725C02F1/727
Inventor 李德宝肖勇侯博鲁怀乾贾丽涛
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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