fall under chemical precipitation, sedimentation, clarification, sludge dewatering,
and pH adjustment before discharge.
Step 1 is the treatment of the picture tube segment which involves collection and
removal of solvent, use of chemical coagulant and coagulant aid for precipitation and
sedimentation of metal waste in the stream, removal of fluoride through precipitation, reduction of chromium, sludge dewatering, and pH adjustment of the wastewater before discharge. Multimedia filtration is the main technology used in step
2 treatment system in addition to treatments in step 1. In step 3, all the above-stated
treatments are repeated with the objective of treating the wastewater for reuse in the
Aperture Masks
Glass Panels
Glass
Funnels
Electron Guns
7. Carbon Black
Application
1. Mask
Degrease
2. Panel and
Mask Mate
8. Strippin Agent
Application and
Carbon Reverse
3. Anneal
4. Panel Wash
5. Photoresist
Application
21. Mount,
Assembly, and Age
19. Frit
Application
18. Seal Surface
Clean
17. Internal Coat
10. Phosphor
Exposure &
Development
11. Lacquer
Coat
9. Phosphor
Application
6. Photoresist
Exposure &
Development
12. Aluminize
13. Panel
Clean
14. Shield Degrease
15. Shield
Attachment
16. Funnel
Wash
20. Panel – Funnel
Fusion
22. Attach,
Mount &
Assembly
23. Exhaust and
Seal
24. Age and
Test
25. External
Coat and
Implosion Band
26. Test and
Ship
Fig. 4.2 Color cathode ray manufacturing process. (Source: [20])
4 Electrical and Electronic Wastes Treatment
147