Electroplating waste gas mainly includes metal dust, acid and alkali waste gas, organic waste gas, chromic acid mist, etc.
Author: Marisa
The necessity of electroplating waste gas treatment is mainly reflected in the following aspects:
1.Harm to the environment and health: Electroplating waste gas contains a variety of harmful substances, such as heavy metals, organic matter and inorganic salts, which will have a serious impact on human health and the ecological environment when discharged into the environment. Harmful gases in the waste gas, such as hydrogen chloride, acid and alkali mist, etc., can cause damage to the respiratory tract, eyes and skin. Long-term exposure may lead to diseases such as bronchitis, asthma, lung cancer, etc. 1. In addition, electroplating waste gas can also cause damage to plants and buildings, and corrode buildings after forming acid rain.
2.Regulatory requirements: Many countries and regions have strict regulatory requirements for the emission of industrial waste gas. Direct discharge of untreated electroplating waste gas will cause environmental pollution, and violations of environmental protection regulations will face penalties. Therefore, waste gas treatment is not only for the protection of the environment and health, but also an important measure to meet regulatory requirements.
3.Process improvement: Adopting clean electroplating production technology and reducing the generation of waste gas from the source is the fundamental way to solve the problem of electroplating waste gas. By improving the process flow and reducing the emission of harmful substances, the difficulty and cost of waste gas treatment can be effectively reduced.
Types and treatment methods of electroplating waste gas:
Electroplating waste gas mainly includes metal dust, acid and alkali waste gas, organic waste gas, chromic acid mist, etc. Common treatment methods include:
1.Physical adsorption method: using adsorbents to adsorb harmful substances in waste gas.
2.Chemical absorption method: using absorbents to react chemically with harmful gases in waste gas to form non-volatile or low-volatile compounds. Chemical absorption method is widely used in waste gas treatment in electroplating sludge warehouses.
3.Combustion method: converting harmful substances in waste gas into harmless substances through combustion.
4.Catalytic oxidation method: using catalysts to promote the oxidation reaction of harmful substances in waste gas and convert them into harmless substances.
Specific cases and policy background:
In the southeast coast and the more economically developed inland areas, the number of electroplating plants has continued to increase, and the emission of electroplating "three wastes" (wastewater, waste gas, and waste residue) has also increased, leading to increasingly serious environmental pollution problems. Therefore, it is of great significance to take active measures to control electroplating waste gas, protect the ecological environment, and control air pollution.