There are some books that are just very good. Ozonation of Water and Waste Water by Christine Gottschalk, Judy Libra and Adrian Saupe is one of them. Ozone is not widely used in Ireland for either drinking water or wastewater treatment, and because of that my knowledge base is very superficial. However, the scope and clarity of this textbook, written in clear and accessible English, has excited a new interest in the area. I recommend it to you. ISBN: 978-3-527-31962-6. Published by Wiley-VCH, Weinheim in 2010.
Amazon Link for access to the book.