Get In Touch

  • +1 905 481 2607 (phone)
    +1 905 481 2610 (fax)

EnviroSim Associates Ltd.
McMaster Innovation Park
7 Innovation Drive
Suite 107
Hamilton, Ontario L9H7H9

For general inquiries, please contact us at the number listed below.

tel : +1 905 481 2607
fax : +1 905 481 2610
general email :
technical support :

4 May Street
Firle, 5070
tel : +61 4207 19583

2630-A NW 41st Street
FL 32606

Please feel free to contact us if you have ANY questions regarding our products or services.

  • 107-7 Innovation Drive
    Flamborough, ON L9H7H9 Canada


International Authorized Resellers

If your country does not appear in the list below, please contact us through our head office in Canada, listed above.

EnviroSim Map

Sichuan Wentao Engineering and Technology Company (WENTAO)
Tianfuxinqu Huayangjiedao Huayangdadao #193 - #197, First floor
Chengdu, Sichuan, China
QQ group: 372419902


Alessandro Gallina
HR Wallingford
tel: +39 335 8280930

Takashi Fuji
NJS Co.,Ltd
Minato-ku, Tokyo
1-1-1, Shibaura
13F, Hamamatsu-cho Bld
tel : +81(3) 6324-4348
e-mail :

Alexander Numankade 205
3572 KX Utrecht
The Netherlands
tel: +31-6-248-42234
fax: +31-15-278-2355

Daniel A. Nolasco, M.Eng., M.Sc., P.Eng.
NOLASCO u0026amp; Assoc. Inc.
Congreso 1908 Piso 2 Dpto. D,
(C1428BVB) Buenos Aires, Argentina
Tel/Fax: +54-11-4896-4061
cel. +54-911-5429-5884

Juan Trillo / Ian Trillo
Asesoria Tecnica y Control S.A.
Passatge de la Cooperativa 1, 1º 2ª
08172 Sant Cugat del Vallès
tel: +34-93-544-1150
fax: +34-93-544-1151

Spektral Scientific Instruments Ltd.
Ali Opcun
Altay Cesme Mah. Yasamkent konutlari
2. Aydan sok. Leylak blok No. 13 / 2
34843, Maltepe/ Istanbul
tel: +90-216-442-5380
fax: +90-216-442-5379


Peter Dold, Ph.D.


Peter Dold is the president of EnviroSim Associates Ltd., developers of the BioSim and BioWin dynamic wastewater treatment plant simulators. These are being used worldwide by consulting engineering firms, water companies and municipalities as tools to aid in process analysis, design, control and operation. He also is an adjunct professor at McMaster University in Hamilton, Canada. Dr. Dold is engaged in a range of research projects dealing with wastewater treatment problems and is involved as a consultant in many municipal and industrial projects, including several involving biological nutrient removal (BNR).

After graduating from Chemical Engineering at the University of Cape Town, Peter embarked on a career in environmental engineering. In 1978 he commenced graduate studies at UCT under the supervision of Professor Gerrit Marais, obtaining the Ph.D. degree in 1982. Areas of interest during this period centered on activated sludge process modeling and system control.

In 1983 Peter joined the faculty of the Department of Chemical Engineering at the University of Cape Town as a senior lecturer. This followed a spell of post-doctoral research with Dr. John Andrews at Rice University, Houston. Until he left Cape Town in 1989, Peter conducted research into various aspects of wastewater treatment jointly with Dr. Marais. Other colleagues in the research team included Drs. George Ekama, Mark Wentzel and Dick Loewenthal. The research endeavors of the University of Cape Town Group during this time addressed a range of municipal and industrial wastewater treatment problems relating to activated sludge treatment systems (particularly those designed for nutrient removal), anaerobic systems and aspects of process control. A major focus of Dr. Dold's research was mathematical modeling of activated sludge systems. Between 1983 and 1987 he was actively involved in development of the well-known IAWPRC activated sludge model.

Peter Dold joined McMaster University in 1989 as an NSERC Industrial Research Chair in Environmental Systems Engineering. He continues to expand his research interests in wastewater treatment. Since 1997 Peter has maintained a part-time position at McMaster, and continues to supervise graduate students working on a range of projects with particular emphasis on biological nitrogen and phosphorus removal activated sludge systems. A milestone has been development of a general mathematical model for systems incorporating organics removal, nitrification, denitrification and biological phosphorus removal. This was the first comprehensive mechanistic kinetic model of this type. Dr. Dold is the author or co-author of more than a hundred research papers and comprehensive research reports.

Dr. Dold is actively involved in a range of consulting activities in Europe, Australia and North America, with an emphasis on full-scale biological nutrient removal systems analysis and design. He has hands-on experience in the installation of computer control systems at full-scale and has been consulted as a technical expert in legal matters relating to phosphorus removal wastewater treatment systems.

Christopher Bye, Ph.D., P.Eng.

Vice-President of Software

Chris Bye is the Vice-President of Software with EnviroSim Associates Ltd. Dr. Bye has over 30 years of experience in wastewater treatment including process design and equipment selection, full-plant modeling and model development for biological nutrient removal, and wastewater characterization and kinetic studies.

After graduating from Civil Engineering at McMaster University, Chris began a career in environmental engineering. In 1994 he commenced graduate studies at McMaster under the supervision of Professor Peter Dold, obtaining the Ph.D. degree in 2000. Areas of interest during this period centered on activated sludge settleability and secondary settling tank modeling.

Dr. Bye has been with EnviroSim Associates Ltd. since 1998. Chris leads and supports consulting projects for analyzing process options for design, assessment of process capacity, analysis of capacity limitations and development of model-based tools for specific plants. During his time with EnviroSim, Chris has been actively involved in the development and application of the latest version of the BioWin wastewater treatment process simulator. Dr. Bye also has been involved in the development of rapid methods for measurement of nitrifier maximum specific growth rate. In addition, Chris participates in the development and delivery of EnviroSim training courses.

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Mark Fairlamb, M.Eng.

Lead Software Developer

Mark Fairlamb is a Senior Process Engineer with EnviroSim Associates Ltd. Mark graduated in Chemical Engineering from the University of Cape Town. In 1991, Mark received his Masters in Environmental Systems Engineering from McMaster. His graduate research, conducted under the supervision of Dr. Peter Dold, involved a study of mass transfer fundamentals in diffused air wastewater treatment systems. This provided the basis for oxygen transfer modeling in the BioWin simulator. Mr. Fairlamb coordinates software development at EnviroSim.

In 1991, Mark began his career with EnviroSim, where he manages and coordinates model and software development for the BioWin and Petwin simulators.

Mark also has extensive experience in the modeling, design and analysis of wastewater treatment processes, including activated sludge (with biological nutrient removal), oxygen mass transfer, primary and secondary settling processes. He has provided services in process modeling, analysis, and design for nitrification and biological nutrient removal plants in the U.S., New Zealand, and Australia.

Mark has been involved the development of custom real-time control systems and several data acquisition and analysis software projects.

Robert Walker, B.Eng.

Software Developer

Robert Walker graduated with a B.Eng. in Software Engineering from McMaster University in 2005. He joined EnviroSim soon after, and has been developing BioWin, BioWin Controller, and a variety of other software tools ever since. Rob specializes in development and simulation of process control strategies.

Gillian Burger, MASc., P.Eng.

Process Engineer

Gillian Burger graduated from McGill University in 2006 with a Bachelor of Civil Engineering and a minor in Environmental Engineering. She then joined Golder Associates in Vancouver as a water resources engineer in the mining waste group. Gillian subsequently relocated with Golder to Johannesburg, South Africa, where she worked as a civil engineer on mine water treatment projects. Following this, Gillian joined Aurecon where she was responsible for the civil and process design of several new and upgraded municipal wastewater treatment plants in Swaziland, Mozambique, Lesotho and South Africa. While with Aurecon, Gillian gained 6 months of site engineering experience at the upgrade of a biological nutrient removal plant in Pretoria, South Africa.

Gillian returned to Canada in 2010 and obtained a Master of Applied Science degree in Civil Engineering from the University of Waterloo in 2012. During this degree, she held the NSERC Graduate Scholarship and Ontario Graduate Scholarship. For her Master’s thesis, Gillian investigated the impacts of thermal pretreatment on activated sludge and developed a pretreatment model. Ms. Burger’s paper based on this work was published in Water Research. During her degree, Gillian also worked as a teaching assistant for two undergraduate engineering courses on wastewater treatment and water quality.

Gillian joined EnviroSim Associates as a process modelling engineer-in-training in January 2013. At EnviroSim, Gillian designs and carries out laboratory experiments to assess the biological nutrient removal capacity of various wastewater treatment plants (phosphorous-release tests, specific nitrification rate tests, denitrification rate tests, etc.). Gillian is also involved in the testing and modelling of wastewater characterization and kinetic studies. Gillian supports consulting projects to analyse process options and assess process capacity. Ms. Burger provides software support to clients, participates in the delivery of EnviroSim training courses and assists with the development of model extensions.

Daniela Conidi, Ph.D., P.Eng.

Process Engineer

Daniela Conidi is a Senior Process Engineer with EnviroSim Associates Ltd. Daniela has over 10 years of experience in wastewater treatment. Daniela obtained her Bachelor of Applied Science in Environmental Engineering (2008), and her Ph.D. in Civil Engineering (2015) from the University of Waterloo. Daniela joined EnviroSim in 2015.

At EnviroSim, Daniela is involved in the development of model extensions to simulate leading edge wastewater treatment technologies, and model-based assessments of existing and future treatment works. Daniela also provides technical support for clients in their applications of BioWin and PetWin, and leads model training courses.

Roger He, MASc., P.Eng.

Process Engineer

Roger (Zhenrong) He is a Process Engineer with EnviroSim Associates Ltd. Roger has over 6 years of experience in process control and software development. Roger obtained his Bachelor of Chemical Engineering from Dalian University of Technology in 2009 and his Master's of Applied Science degree in Chemical Engineering from University of Waterloo in 2017.

Roger joined EnviroSim in 2018, and earned his Professional Engineer (Ontario) designation in 2019. At EnviroSim, Roger is involved in software development and real time process control projects.

Paul Jarrett, P.E.

Technical Director

Paul Jarrett joined EnviroSim in 2015 as Technical Director and Manager of the FL office. Paul comes to EnviroSim USA LLC with over 30 years experience in many facets of wastewater treatment process engineering. After completing graduate studies at Vanderbilt University, Paul worked with Aware/Eckenfelder Inc. and later was appointed to the faculty of the University of Auckland, New Zealand. He joined CH2M Hill in Auckland in 1997, and subsequently transferred to the CH2M office in Gainesville, FL. In 2006 Paul formed Reclaim Solutions Inc., and has been involved in a range of projects in wastewater treatment plant design and operations.

Contact information:

Paul Jarrett
Email :
Office: +1 (352) 372-1113
Mobile: +1 (352) 281-6794

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Joan Krygsman

Everything Else

Joan has been working with EnviroSim since 2003. In addition to her EnviroSim work, Joan is an artist, illustrator, writer and musician working out of Dundas, Ontario.

Angelos Yiannou, M. Eng
Angelos Yiannou, M. Eng.

Process Engineer

Angelos Yiannou holds a Master’s degree in Mechanical Engineering (University of Pretoria, South Africa, 2014) and a Master’s degree in Water Quality Engineering (University of Cape Town, South Africa, 2019).

His professional experience includes Mechanical design, Process Engineering, and the application of Machine Learning and Artificial Intelligence for the purposes of wastewater treatment and optimization.