Coking wastewater deep treatment system combing ozone catalytic oxidation and electro-adsorption

Abstract

The invention relates to a coking wastewater deep treatment system combing ozone catalytic oxidation and electro-adsorption and belongs to the technical field of coking wastewater treatment. The system comprises an ozone catalytic oxidation reactor, an ozone generator, an oxygen tank, a gas-liquid separator, a filter, an electro-adsorption device, a recycling water tank, a concentrated water tank, a water generating electromagnetic valve, a concentrated water electromagnetic valve and a connection pipeline; an outlet of coking wastewater is sequentially connected with the ozone catalytic oxidation reactor, the gas-liquid separator, the filter and the electro-adsorption device, and a water outlet of the electro-adsorption device is connected with the recycling water tank through the water generating electromagnetic valve and meanwhile connected with the concentrated water tank through the concentrated water electromagnetic valve; an inlet of the ozone generator is connected with the oxygen tank, and an outlet of the ozone generator is connected with a gas inlet of the ozone catalytic oxidation reactor; the ozone catalytic oxidation reactor is connected with a direct current power source. According to the coking wastewater deep treatment system, coking wastewater deep treatment and recycling can be achieved by combining ozone catalytic oxidation and electro-adsorption, and up-to-standard release of concentrated water is further guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of treatment of coking wastewater, and in particular relates to a system for advanced treatment of coking wastewater by a combination of ozone catalytic oxidation and electric adsorption, and aims to provide a depth of further treatment of coking wastewater secondary biochemical effluent to realize reuse Dealing with new technologies. Background technique [0002] Coking wastewater is a kind of industrial wastewater recognized in the world that is difficult to biodegrade. It mainly includes distilled ammonia wastewater, crude benzene separation wastewater, final cold water discharge wastewater, and water seal tank discharge wastewater. Pollutants contained in coking wastewater include organic pollutants such as phenols, polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, oxygen, and sulfur, and inorganic compounds such as ammonia, thiocyanide, sulfide, and cyanide. Coking wastewater treatm...

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Problems solved by technology

Commonly used advanced treatment processes include coagulation sedimentation, sand filtration, biological filter, reverse osmosis, electrodialysis, etc. The existing advanced treatment systems generally include coagulation sedimentation and biological filter, although the effluent COD (chemical oxygen demand ) is controlled at about 100mg / L, but it still cannot meet the water quality requirements for water purification in production

Or use activated carbon to filter, which can effectively remove COD in water and reduce COD to below 60mg / L, but it does not remove inorganic salts and cannot meet the reuse standard

There are also membrane treatment processes such as reverse osmosis. The advantage of the membrane treatment process is that the effluent has a low salt content and meets the requirements for reuse; however, the membrane treatment process also has certain limitations, and the anti-pollution performance is poor. The concentrated water is not only concentrated in salt, COD It is also concentrated, and the COD of the concentrated water is as high as 200-300mg / L, which is difficult to meet the discharge requirements

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