Book excerpt: Understandable Step-by-Step Wastewater Math Wastewater treatment plant operators use mathematics to make key process decisions. It is important for the operator to have an understanding of math fundamentals along with the technical concepts of wastewater treatment plant operation. By reviewing the math principles presented in this text and linking these principles to wastewater treatment processes, the operator can better understand and solve math related problems. This Handbook describes the typical wastewater treatment plant processes encountered by today's operator and shows how to solve process related math problems. The Math Handbook for Wastewater Treatment Plant Operators is also a valuable resource in preparing the operator for math problems given on licensing examinations for wastewater treatment systems. Typical exam problems are solved in an easy to understand, step-by-step format.