EnviroSim Associates Ltd

EnviroSim provides simulation software solutions and consulting services for wastewater process engineers around the world. Our expertise includes municipal and industrial wastewater treatment, Biological Nutrient Removal (BNR) process design and optimization, wastewater characterization / kinetic studies, and model calibration.

We are the developers of :

Our attention to detail, support for the latest international models, and continual development and enhancement of BioWin and PetWin+ make them invaluable tools for plant operation and design. EnviroSim is continually engaged in ongoing research and development to ensure that both BioWin and PetWin+ remain as the leading wastewater process simulators. Our development is driven by the needs of our customers, which serves to enhance the real-world applicability of our products.

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Get BioWin 5.3

BioWin 5.3 contains a new Granular Sludge Sequencing Tank element to model this process, which is gaining acceptance worldwide as an effective wastewater treatment technology. BioWin 5.3 also contains an enhancement to the trickling filter element and refinements to model parameters.


A more comprehensive description of the upgrade may be found in the document What’s New in BioWin 5.3 in PDF format.



EnviroSim offers training courses on our entire software suite, as well as software independent courses covering general aspects of modeling, model calibration and wastewater processing.

Click to read more about about EnviroSim Courses.


EnviroSim works closely with our clients to provide expertise and assistance through experimental work (wastewater characterization, nitrification rate measurement), model-based consulting and model development.

Click to read more about about EnviroSim Services.


Our Mission

Our mission is to develop and market leading edge tools for the simulation of wastewater treatment processes. Our interest and research in all aspects of biological and other wastewater treatment processes ensures that we provide the wastewater engineering community with accurate, affordable software solutions and related services.

Where in the World is BioWin?