Electrochemistry-based waste gas and wastewater coupling purification system and purification method thereof

Abstract

The invention discloses an electrochemistry-based waste gas and wastewater coupling purification system and a purification method thereof. In existing enterprises, waste gases and wastewater are separately treated, and therefore, secondary wastewater / waste gas treatment is needed during waster gas / wastewater treatment, environmental protection facilities are repeatedly put into use, and the investment, operation and maintenance cost is high. The purification method comprises the following steps: pretreating waste gases through a photoelectric treatment tower, performing electrochemical coupling purification with a gas phase oxidation tower and a liquid phase oxidation tower to realize up-to-standard discharge; and performing electrochemical coupling purification on wastewater with the liquid phase oxidation tower and the gas phase oxidation tower so as to realize up-to-standard discharge. The photoelectric treatment tower is a waste gas purification technology based on a waste gas plasma catalysis system and a photocatalysis system; and the gas phase oxidation tower and the liquid phase oxidation tower refer to a waste gas and wastewater electrochemical coupling oxidation-flocculation purification technology based on a Fe-C microelectrolysis technology and an electronics-Fenton technology. The respective advantages of Fe-C microelectrolysis and electronics-Fenton are coupled, the drug input cost is low, the electric consumption is low, and the market space is wide.

Description

technical field [0001] The invention relates to a waste gas and wastewater coupling purification method, in particular to an electrochemical-based waste gas and wastewater coupling purification system and a purification method thereof. Background technique [0002] General enterprises produce flue gas, VOCs (volatile organic compounds) and other waste gas and waste water, but they are often disposed of separately; resulting in waste gas / waste water treatment requiring secondary treatment of waste water / waste gas, repeated investment in environmental protection facilities, high investment, operation and maintenance costs, The burden on enterprises is heavy. The waste gas and wastewater discharge indicators currently implemented in my country are becoming more and more stringent. Some provinces and cities have upgraded their standards to local standards or industry standards on the basis of national standards. Enterprises are burdened because they cannot find suitable technolo...

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Problems solved by technology

[0007] SCR denitration catalysts generally have a service life of three years. In addition to vanadium dioxide, vanadium pentoxide, and tungsten trioxide, deactivated catalysts also contain heavy metals such as chromium, beryllium, arsenic, and mercury, which have been included in the "National Hazardous Waste List" ( HW50 waste catalyst: 772-007-50 waste vanadium-titanium catalyst produced in the process of flue gas denitrification), the cost of hazardous waste disposal is high

Both SCR and SNCR flue gas denitrification technologies have secondary pollution problems such as ammonia escape

[0008] Some enterprises use ozone technology to treat waste gas and wastewater, which can easily cause secondary pollution problems such as ozone escape. At present, there is no good solution, and upgrading is urgently needed.

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