Chemical Process Principles-Part 1- Material & Energy Balances, by Hougen, Watson & Ragatz, John Wiley (2nd Ed is 1943) is a classic. I still use it. Their method for setting up calculations is the standard. Freeman Self, PE, FAIChE
Level 3 - Bechtel Internal and Selected External Distribution
I fully endorse what Freeman says about Hougen, Watson. If you really understand its basic principles you can still do every materials balance problem in the PE Exam.
On the subject of Legionella:
It is primarily a disease, first associated with cooling towers. The solution to that particular source is chlorine or other proper disinfection.?? Back when EPA outlawed the use of Hexavalent Chromium in cooling towers (except for comfort cooling), they solved one problem but created another.?? The Cr+6 was also a good disinfectant, and its removal allowed the development of all kinds of microbial populations in cooling towers.???? Carrying a disinfectant in the cooling tower would reduce the incidence of Legionella.
Use of the weaker oxidizer monochloramine has shown success in that it penetrates layers containing weak reducing agents without being depleted as a strong oxidizer (such as chlorine) would. It finds strong reducing agents like the sulfhydryl groups in biota, disrupting cell protein generation.
Mikel E Goldblatt, PE
Senior Engineering Consultant, Water & Wastewater Treatment
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