During the production process of the electroplating industry, a large amount of polluting waste gas and waste will be generated. There are sewage containing heavy metals and various harmful chemical substances, and a lot of toxic waste gas will be discharged. If these waste gases are not managed by measures, if these gases are directly discharged without treatment, they will cause major harm to the surrounding environment and the health of residents. The solution of electroplating waste gas treatment provides a technical reference for waste gas treatment in the electroplating industry, and is of great significance to the protection of the ecological environment and the control of air pollution.
Waste gas treatment processIndustry characteristics
The source of waste gas produced by electroplating plants is acid mist and alkaline gas volatilized during acid-base immersion. The waste gas is highly corrosive and is very harmful to the human body. At the same time, the production workshop also has inorganic waste gas volatilized by various processes and a small amount of VOC. Common electroplating waste gas is mostly nitric acid, hydrochloric acid, sulfuric acid, complex acid, chlorine and cyanide waste gas, etc.
Wet scrubber+ photo-oxidation catalytic equipment + centrifugal fan + safe discharge after silence
Brief description of recommended treatment process:
By changing the production process of the electroplating industry, or using non-toxic materials, the goal of zero discharge of toxic and harmful waste gas can be achieved during the electroplating production process.
Waste gas treatment process:
The exhaust gas first reaches the inner cylinder of the divergent section of the exhaust gas scrubber and decelerates. Inside the body of the scrubber, there is a divergent inner cylinder, a uniform style grid, a packing layer and a spray device. The exhaust gas passes through the water curtain layer and is pressed into the equalizing chamber in the tower by the fan, and enters the first-level packing layer through the equalizing grid. At this time, the circulating pump runs continuously and is sprayed out from the spray system liquid distributor. The neutralization liquid (approximately 10% NaOH low-concentration alkaline solution) is fully gas-liquid contact with the acid waste gas, countercurrent washing and neutralization reaction, the tower is filled with high-quality new PP filler, so that the waste gas is evenly distributed in the PP Around the packing, each one is in point contact, and the arrangement of "Z or W" walks in an irregular route, and there is no drift phenomenon, which greatly increases the gas-liquid contact space and area, so that the exhaust gas and liquid are in full contact with each other in an excellent medium. And absorption state. In this way, the gas-liquid two-phase mixing rate can reach more than 97%. At this time, the exhaust gas will decelerate from the divergent section and enter the second and third-stage packing layer spray function section. After the deliquor removes the liquid and mist, the exhaust gas reaches the standard for discharge into the atmosphere at this time.