waste water treatment

Anybody have waste water treatment, sewage treatment and effluent treatment process design book or any spreadsheet or software??

i am working with waste water treatment company>

need urgently?

THANK YOU

For some quick help go to:

[url]http://www.lenntech.com/wwtp/calculation-summary.htm[/url]

They are a water and wastewater treatment equipment manufacturer in Europe and I think they have the best set of free on-line calculators available on the internet.