Catalytic ozonation treating apparatus and process for refractory organic wastewater

Abstract

The invention relates to a catalytic ozonation treating apparatus and process for refractory organic wastewater. The apparatus comprises a catalytic oxidation tower, an ozone generator connected with the bottom inlet of the catalytic oxidation tower and a tail gas treating and recycling system connected with the top outlet of the catalytic oxidation tower, wherein the outlet of the tail gas treating and recycling system is connected with the inlet of the ozone generator, and the tail gas treating and recycling system comprises a carbon dioxide absorbing tower, a drying unit and an oxygen storage tank which are successively connected. According to the invention, high-concentration ozone is generated from pure oxygen via the ozone generator, macro-molecular refractory organic pollutants in the organic wastewater is subjected to catalytic ozonation in the catalytic oxidation tower, and tail gas is treated by the tail gas treating and recycling system and then cyclically used as a gas source for the ozone generator; carbon dioxide and steam are removed through the tail gas treating and recycling system, so tail gas is purified, secondary pollution is avoided, the utilization rate of oxygen is improved, and treating cost is reduced.

Description

technical field

[0001] The invention relates to the field of advanced treatment of organic wastewater, and provides an organic wastewater ozone catalytic oxidation treatment device and process, in particular to an ozone catalytic oxidation treatment process for refractory organic waste water capable of recycling oxygen. Background technique

[0002] Ozone has a strong oxidizing ability, and its oxidation-reduction potential in water is 2.07eV. The method of treating wastewater with ozone is called ozonation, which is a kind of chemical oxidation method. In foreign countries, ozone has been widely used as a disinfectant for drinking water. It can quickly and effectively kill bacteria and viruses in water and remove odors in water. Ozone is also used to treat industrial wastewater, which can effectively remove many organic and inorganic pollutants in wastewater, reduce BOD and COD of wastewater, and have significant effects on decolorization, deodorization, and sterilization....

Examples

specific Embodiment 1

[0053] The device is used for advanced treatment of coal chemical wastewater.

[0054] After biochemical and coagulation treatment of coal chemical wastewater, the residual COD is mainly refractory organic pollutants, with a COD of 150-200mg / L and a chroma of 100-200 times. The waste water enters the water storage tank 1, enters the catalytic oxidation tower 3 from the top through the water inlet pump 2, and the catalytic oxidation tower 3 is filled with catalyst components 6. Oxygen content is that the gas of 90-100% produces the ozone concentration that is about 10% through ozone generator 5, adjusts the air intake to ensure that the ozone dosing amount is 150-400mg / L waste water, described refractory organic waste water and ozone generator The flow ratio of the generated ozone is 1:0.5, and the ozone enters the catalytic oxidation tower 3 from the bottom and contacts with the coal chemical wastewater in the catalytic oxidation tower 3 in cross-flow, and catalytic oxidation ...

specific Embodiment 2

[0057] The device is used for advanced treatment of printing and dyeing wastewater.

[0058] After printing and dyeing wastewater undergoes traditional primary and secondary treatment, the residual COD is mainly refractory organic pollutants with chromophoric groups, with a COD of 300-500 mg / L and a chromaticity of 200-400 times. The waste water enters the water storage tank 1, enters the catalytic oxidation tower 3 from the top through the water inlet pump 2, and the catalytic oxidation tower 3 is filled with catalyst components 6. Oxygen content is that the gas of 90-100% produces the ozone concentration that is about 10% through ozone generator 5, adjusts the air intake to ensure that the ozone dosing amount is 300-1000mg / L waste water, described refractory organic waste water and ozone generator The flow ratio of the generated ozone is 1:1.5. The ozone enters the catalytic oxidation tower 3 from the bottom and cross-flow contacts with the printing and dyeing wastewater in ...

technical field

[0001] The invention relates to the field of advanced treatment of organic wastewater, and provides an organic wastewater ozone catalytic oxidation treatment device and process, in particular to an ozone catalytic oxidation treatment process for refractory organic waste water capable of recycling oxygen. Background technique

[0002] Ozone has a strong oxidizing ability, and its oxidation-reduction potential in water is 2.07eV. The method of treating wastewater with ozone is called ozonation, which is a kind of chemical oxidation method. In foreign countries, ozone has been widely used as a disinfectant for drinking water. It can quickly and effectively kill bacteria and viruses in water and remove odors in water. Ozone is also used to treat industrial wastewater, which can effectively remove many organic and inorganic pollutants in wastewater, reduce BOD and COD of wastewater, and have significant effects on decolorization, deodorization, and sterilization....

Examples

specific Embodiment 1

[0053] The device is used for advanced treatment of coal chemical wastewater.

[0054] After biochemical and coagulation treatment of coal chemical wastewater, the residual COD is mainly refractory organic pollutants, with a COD of 150-200mg / L and a chroma of 100-200 times. The waste water enters the water storage tank 1, enters the catalytic oxidation tower 3 from the top through the water inlet pump 2, and the catalytic oxidation tower 3 is filled with catalyst components 6. Oxygen content is that the gas of 90-100% produces the ozone concentration that is about 10% through ozone generator 5, adjusts the air intake to ensure that the ozone dosing amount is 150-400mg / L waste water, described refractory organic waste water and ozone generator The flow ratio of the generated ozone is 1:0.5, and the ozone enters the catalytic oxidation tower 3 from the bottom and contacts with the coal chemical wastewater in the catalytic oxidation tower 3 in cross-flow, and catalytic oxidation ...

specific Embodiment 2

[0057] The device is used for advanced treatment of printing and dyeing wastewater.

[0058] After printing and dyeing wastewater undergoes traditional primary and secondary treatment, the residual COD is mainly refractory organic pollutants with chromophoric groups, with a COD of 300-500 mg / L and a chromaticity of 200-400 times. The waste water enters the water storage tank 1, enters the catalytic oxidation tower 3 from the top through the water inlet pump 2, and the catalytic oxidation tower 3 is filled with catalyst components 6. Oxygen content is that the gas of 90-100% produces the ozone concentration that is about 10% through ozone generator 5, adjusts the air intake to ensure that the ozone dosing amount is 300-1000mg / L waste water, described refractory organic waste water and ozone generator The flow ratio of the generated ozone is 1:1.5. The ozone enters the catalytic oxidation tower 3 from the bottom and cross-flow contacts with the printing and dyeing wastewater in ...

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