We all know that wastewater treatment is an issue worthy of continuous attention. The treatment methods should be determined according to actual conditions. Disinfection and wastewater monitoring are carried out based on water quality analysis, and water quality status can be evaluated through this workflow. When it comes to the treatment of industrial wastewater in electronics factories, it can be analyzed in four main categories.
Key monitoring parameters for electronics factory industrial wastewater include high-acidity substances, oil, organic matter and copper.
High-acidity concentrated wastewater
It is generated from pickling, electroplating and other processes. Except for copper ions, the concentration of other pollutants in this stream is relatively low. Therefore, priority can be given to resource recovery and reuse, with pH adjustment as a core operation.
Treatment process for oil-containing wastewater
Oil removal aims to guarantee surface cleanliness in each process, including the removal of oil contamination on PCB boards. Since oil additives are present in degreasing wastewater, its COD value tends to be high, and the wastewater may show acidic or alkaline properties. The mainstream treatment applies strong oxidation reaction with organic acid cleaning solution to reduce COD content and make wastewater meet discharge standards.
High-concentration organic wastewater
This type of wastewater contains large amounts of dry-film residues, photo-resist and other substances, resulting in high COD values, which requires timely treatment.
Chemical copper wastewater
This wastewater comes from chemical copper deposition and desmear processes, and contains high levels of HCHO, C₁₀H₈N₂ and other components. Its main characteristics are listed below:
- EDTA in wastewater can form cyclic complexes with divalent copper ions. Traditional chemical coagulation methods struggle to break bonds and separate free divalent copper ions effectively.
- Formaldehyde (HCHO) in wastewater contributes to high organic content, reflected in elevated CODcr values.
It is critical to note that direct discharge of this stream into the comprehensive wastewater treatment system without pre-treatment will affect compliance of final discharge indicators. Water quality monitoring requires sustained and step-by-step implementation.
