Hi  Damare: it was exactly ...

Hi  Damare:

it was exactly my question when I started my master in environmental engineering, the branch of water and wastewater treatment and management. The best reference which I found, was

"water reuse Issues , Technologies and applications" by Asano and you can download it easily from internet. It is approximately the most comprehensive text book in the field of  water and wastewater. I hope it helps you.