Mathematical models as a tool to simplify the complexity of biochemical reactions and processes in the biological wastewater treatment systems become necessary to optimize the process designs or to troubleshoot problems at wastewater treatment plants as well as at the bench-scale in research. The models are generally required to be more practical for engineering applications while they are more flexible for research tools. The mathematical models are mainly divided into two major categories according to biological growth processes, i.e., suspended growth or attached growth. However, models may expand to include both types of these biological growths into one model such as an IFAS model.

1. Computer Program Development for Activated Sludge Biological Wastewater Treatment System with Microsoft Excel. National National Research Council of Thailand - NRCT, 2016.
2. Development of Mathematical Model for Evaluation of Acrylamide Effects on the Kinetics of Organic Matters and Nitrogen Removals in Biological Wastewater Treatment Processes. National National Research Council of Thailand - NRCT, 2015.