The principles of chemical kinetics, the building of reactors, and the operation of biological treatment techniques are all covered in the book titled ” Industrial Water and Wastewater Treatment” This text provides a visual presentation of the numerical applications that illustrate the analysis of laboratory data. Begins with an overview of the engineering of wastewater treatment systems, whether they are for domestic or commercial use. Several empirical methods for assessing wastewater contaminant concentrations are also discussed. Common wastewater treatment processes include sedimentation, screening, flotation, neutralization, and equalization. Evaporation and biological breakdown are two other processes. Further, this book discusses how the stationary film theory might be applied to the issue of oxygen transport. The term “tertiary treatment,” also known as “advanced wastewater treatment,” describes a set of processes designed to improve the quality of the treated water beyond what can be achieved with standard secondary treatment.