A large amount of wastewater is generated in the automobile manufacturing process, which contains a large amount of harmful substances, and if not properly treated, it can cause great harm to the environment and human health. Therefore, automotive manufacturing wastewater treatment is very important.
Wastewater treatment from automobile manufacturing can be done using a variety of methods such as physical, chemical, and biological methods. Among them, the physical method includes precipitation, filtration, adsorption, air flotation, etc., the chemical method includes neutralization, oxidation, reduction, etc., and the biological method includes activated sludge method, biofilm method, etc. These methods can be combined and optimized according to different treatment objects and processing requirements to achieve the best treatment results.
The process of wastewater treatment in automobile manufacturing
Pretreatment. Automotive manufacturing wastewater first needs to be pre-treated to remove large particles of suspended solids and impurities. Commonly used methods include sedimentation, filtration, and air flotation. The sedimentation method mainly sinks the suspended solids in the wastewater naturally by standing and then separates them; The filtration method is to intercept the suspended solids in the wastewater through the filter membrane; The air flotation method is to inject gas into the wastewater to cause the suspended solids to form bubbles, which separate them.
Chemical treatment. The pre-treated wastewater needs to be chemically treated to remove harmful substances from it. Commonly used methods include neutralization, oxidation, and reduction, among others. The neutralization method mainly adjusts the pH in the wastewater to neutral by adding chemical substances; The oxidation method mainly oxidizes and decomposes the organic matter in the wastewater by adding an oxidant; The reduction method is to reduce the heavy metal ions in the wastewater into low-toxic or non-toxic substances by adding a reducing agent.
Biological treatment. Chemically treated wastewater needs to be biologically treated to further remove harmful substances from it. Commonly used methods include activated sludge and biofilm methods. The activated sludge method is mainly through cultivating and domesticating activated sludge so that it can effectively adsorb and degrade organic matter in wastewater; The biofilm law is to cultivate microorganisms on a filter membrane so that they can adsorb and degrade organic matter in wastewater.
Deep processing. Biological wastewater also needs to be further treated to further remove harmful substances. Commonly used methods include adsorption, ion exchange, and electrodialysis. The adsorption method mainly adsorbs out the organic matter in the wastewater through adsorbents; The ion exchange law is to exchange the heavy metal ions in the wastewater through ion exchangers; The electrodialysis method is to separate the ions in the wastewater under the action of an electric field.