Principal Aspects of Chemical and Biological Processes used in Water Treatment

Webinaire / les 26 et 27 mars 2025 /
Code : 15-0303-ONL25

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Veuillez noter :
This course is held online over 2 days on the following schedule (All times in Eastern Time Zone):

10 am to 6 pm Eastern (Will include the usual breaks)

After participating in this course, you will be able to:

  • Understand principles of chemical and biological processes and techniques for the removal of organic and inorganic contaminants from contaminated water and wastewater
  • Learn about the technologies that are commonly used in industrial water and wastewater treatment operations
  • Develop a better understanding of the mechanisms and design aspects of water and wastewater treatment processes
  • Apply your knowledge of various chemical and biological technologies to water and wastewater treatment projects

This course discusses chemical and biological processes and their applications in industrial operations and environmental engineering practices. It addresses mechanisms, operation principles and applications of pertinent processes used in the removal of organic and inorganic contaminants from contaminated water and wastewater.

The following processes will be discussed: coagulation and flocculation, oxidation-reduction, chemical precipitation, water softening, ion exchange, activated sludge, trickling filters, rotating biological contactors, moving-bed biofilm reactors and lagoons. 

Case studies will be presented and discussed throughout the course.

Course Outline:

  • Fundamental chemical concepts
  • Oxidation-reduction processes
  • Coagulation and flocculation
  • Chemical precipitation
  • Water softening
  • Ion exchange
  • Chemical disinfection
  • Fundamental aspects of biological processes and Microbial kinetics
  • Biological processes in water & wastewater treatment
  • Treatment lagoons

Who Should Attend:
Environmental Engineers • Consulting Engineers • Environmental Educators • Industrial Staff • Technicians & Technologists • Municipal Planners • Plant Managers • Plant Operating personnel 

Veuillez noter :
This course is held online over 2 days on the following schedule (All times in Eastern Time Zone):

10 am to 6 pm Eastern (Will include the usual breaks)

Horaire : 10:00 AM - 6:00 PM EDT

Exigences techniques

Pour les utilisateurs de PC
OS: Windows 7, 8, 10 ou plus récent

Navigateur :
IE 11 ou plus récent, Edge 12 ou plus récent, Firefox 27 ou plus récent, Chrome 30 ou plus récent

Pour les utilisateurs de Macintosh
OS: MacOS 10.7 ou plus récent

Navigateur :
Safari 7+, Firefox 27+, Chrome 30+

OS: iOS 8 ou plus récent

OS: Android 4.0 ou supérieur

voir le programme complet


Veuillez noter :
This course is held online over 2 days on the following schedule (All times in Eastern Time Zone):

10 am to 6 pm Eastern (Will include the usual breaks)

Day I

Fundamental Chemical Concepts

  • Chemical kinetics
  • Chemical reactions and equilibrium
  • Catalytic reactions

Oxidation-Reduction Processes

  • Oxidation-reduction reactions
  • Oxidizing and reducing agents
  • Metals precipitation by oxidation-reduction
  • Oxidation-reduction reactions in wastewater treatment: removal of organic and inorganic contaminants

Coagulation and Flocculation

  • Characteristics of colloids and suspended particles
  • Theoretical aspects of coagulation and flocculation processes
  • Mechanisms of colloid and suspended solids removal during coagulation and flocculation processes
  • Type of coagulants and flocculants
  • Design of coagulation-flocculation reactors

Chemical Precipitation

  • Removal of metals from a solution by chemical precipitation
  • Hydroxide precipitation of metals
  • Carbonate precipitation of metals
  • Sulfide precipitation of metals
  • Removal of phosphorus from water by chemical precipitation

Water Softening

  • Water softening by chemical precipitation
  • Water softening operations
  • Estimation of chemical consumption and solids production during softening processes

Day 2

Ion Exchange

  • Ion exchange mechanism and applications
  • Ion exchange resin selectivity and affinity
  • Resin regeneration after water demineralization
  • Water softening by ion exchange

Chemical Disinfection

  • Mechanisms of action of disinfectants
  • Properties of appropriate disinfectants used in water treatment operations: advantages and limitations
  • Chlorination
  • Ozonation
  • UV disinfection

Fundamental Aspects of Biological Processes

  • Principles of microbial processes
  • Aerobic and anaerobic biodegradation
  • Microbial kinetics

Biological Processes in Water and Wastewater Treatment

  • Primary, secondary and tertiary treatment
  • Removal of organic carbonaceous compounds
  • Removal of nitrogen and phosphorus
  • Activated sludge process
  • Trickling filters
  • Rotating biological contactors
  • Moving-bed biofilm reactors

Treatment Ponds or Lagoons

  • Lagoon systems and their operation principles
  • Naturally-aerated and mechanically-aerated lagoons: biochemical reactions and design
  • Anaerobic and facultative lagoons: biochemical reactions and design

Questions and Answers, Feedback on Achievement of Learning Objectives


Laleh Yerushalmi, Ph.D., P.Eng.

Laleh is the Chief Technology Officer of BioCAST Systems Inc. and Dagua Technologies Inc. in Montreal. She holds a Ph.D. in Chemical Engineering and specializes in Environmental and Biochemical Engineering.

Laleh is a professional engineer and member of l’Ordre des ingénieurs du Québec. She is the inventor of BioCAST technologies and is currently in charge of research and development at BioCAST Systems Inc. and Dagua Technologies Inc. Laleh has more than twenty years of experience in the design, development and optimization of chemical and biological processes for wastewater treatment and site bioremediation.

She was formerly the Director of Research and Development, in charge of operation management and performance optimization of a proprietary wastewater treatment technology at Atara Corporation in Montreal. She has also been a Research Analyst at Statistics Canada, involved in environmental modelling, designing and developing methodologies for estimating environmental emissions. She was formerly a Research Officer at the National Research Council of Canada, responsible for designing and developing groundwater treatment technologies. Laleh teaches and supervises graduate research theses at McGill and Concordia Universities.

She has presented the results of her research at numerous conferences and has published more than a hundred articles in scientific journals.


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