Marie, If you are truly interested in getting into this subject as a active project. You will need to start with a detailed listing of all processes you intend to operate in your plant. In addition you will need a to develop a complete listing of process specifications with types and levels of contamination expected in each waste stream. Another major hurdle is what possible uses that you have within your plant for recycled water etc. You will need to establish minimum water quality standards for your recovered water. This information may then be used to develop a comprehensive treatment plan and define processes to be used. A process that is cost effective for 10,000 gal/week may not even be worth considering at a rate of 100 gal/week. The last project of this type I did was a @250 GPM Copper and @65 GPM Sn/Pb rinse water system. With installation and startup it took nearly 19 months the complete. The survey was repeated just prior to startup and all water samples where checked to prevent contamination due to process changes. I wish you the best of luck on this one! Fred Golisano [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: [TN] waste treatment Author: "TechNet Mail Forum." <[log in to unmask]>, at corp