Principles of PCB Board Wastewater Treatment Process
- General Mixed Wastewater W1:
- High-Concentration Organic Wastewater W2:
General mixed wastewater W1 consists of a large volume of water with a low CODCr concentration. It undergoes treatment in the integrated wastewater treatment system (1# system) where the focus is on removing metal ions and a small amount of organic matter. The treatment process includes flocculation, sedimentation, sand filtration, and pH adjustment. Initially, ferrous sulfate is added for coagulation, followed by pH adjustment to around 10 to eliminate heavy metal ions (Cu2+) by forming hydroxides. Subsequently, PAM flocculant is introduced for further treatment in the flocculation tank, and the wastewater goes through separation in the inclined plate sedimentation tank. After filtration and pH adjustment, the treated wastewater is discharged with a pH level between 6 and 9.
High-concentration organic wastewater W2 contains a high CODCr concentration and undergoes acidification and precipitation in the pretreatment process. The treatment involves pH adjustment to around 5 using an acidulant, followed by the addition of polyferric chloride to condense oily organic matter into larger particles for separation. Polymer flocculant PAM is then added, and the solid-liquid components are separated through pressure filtration. The filtrate is combined with general organic wastewater for advanced treatment in the general organic wastewater pretreatment facility (2# system).
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