Profile: EnviroPro Designer is an environmental process simulator designed to enhance the productivity of engineers and scientists engaged in the design, development and assessment of integrated water purification, wastewater treatment, and waste disposal processes. We provide under a single umbrella modeling of end-of-pipe treatment processes, project economic evaluation, and environmental impact assessment. We offer rigorous and versatile biological reactor models can be used to represent and optimize biochemical oxidation as well as nitrogen and phosphorous removal processes. We provide VOC emission models can be used to calculate emissions from treatment plants and track the fate of hazardous chemicals.