ABSTRACT
This chapter focuses on the industries manufacturing printed circuit boards and computer rigid discs where evolution of production technology is still taking place. To plan and design a successful treatment facility for printed circuit board or rigid disc wastewater, the information is needed at the preliminary phase of the project. The density of hazardous waste producing industry is relatively high in the Silicon Valley. However, for the printed circuit board manufacture, these chemicals are mixed with other chemicals, in most cases, with chelating agents to keep heavy metals from settling in the manufacturing process. Rigid disc manufacturing is an extremely precise process where a single 3 millimicrons nodule on the disc is considered an unacceptable flaw. The aluminum oxide slurry is generated from the polishing process using aluminum oxide to polish nickel plated disc. The key to successful waste treatment appears to depend on the proper regulation of the concentrated discharge especially the electroless nickel solution into the system.
