The composition of organic wastewater generated in the manufacturing process of electronic circuit boards is complex, containing a large number of heavy metal ions, organic matter, acid and alkali substances. If this wastewater is not properly treated, it can cause serious pollution to the environment. Therefore, the treatment of organic wastewater from electronic circuit board manufacturing is an important part of environmental protection.
Organic wastewater treatment process for electronic circuit board manufacturing
Pretreatment: The purpose of pretreatment is to remove large particles of solids and impurities in wastewater and create favorable conditions for subsequent treatment. Commonly used pretreatment methods include natural sedimentation, filtration, and centrifugation.
Heavy metal ion removal: For heavy metal ions contained in wastewater, chemical precipitation, adsorption and ion exchange can be used to remove them. According to the type and concentration of heavy metal ions in the wastewater, the appropriate treatment method is selected.
Organic matter removal: Organic matter is one of the important pollutants in the organic wastewater of electronic circuit board manufacturing. Removal can be carried out using methods such as biological treatment, advanced oxidation, and adsorption. Biological treatment is the use of microbial metabolism to convert organic matter into harmless substances; Advanced oxidation is the use of strong oxidants to oxidize organic matter into small molecules; Adsorption is the use of activated carbon and other adsorbents to adsorb organic matter on its surface, and then remove it by solid-liquid separation.
Acid-base neutralization: Since the wastewater may contain acidic or alkaline substances, acid-base neutralization treatment is required to make the pH value of the wastewater meet the discharge standard. Commonly used acid-base neutralizers include lime, sodium hydroxide and sodium carbonate.
Advanced treatment: After pretreatment, heavy metal ion removal, organic matter removal and acid and alkali neutralization, the pollutants in the wastewater are effectively removed. In order to further improve the quality of the wastewater, advanced treatment can be carried out. Commonly used advanced treatment methods include activated carbon adsorption, membrane filtration, and photocatalytic oxidation.
Reuse: The wastewater after advanced treatment can reach a certain water quality index and meet the requirements of reuse. Depending on the application, the wastewater can be reused for washing, cooling and process water in the production process.