BES706 - Water Treatment

Outline info
Last revision date 2018-08-28 16:19:55.889
Last review date 2018-08-28 16:19:55.89

Subject Title
Water Treatment

Subject Description
This subject covers the key concepts in the field of water treatment as applied to the protection and operation of building mechanical systems.

Credit Status
One credit toward the Building Environmental Systems (BES) Operator Class II Certificate

Learning Outcomes
Upon successful completion of this subject the student will be able to:

- Identify the principal contaminants of untreated water from various sources, and explain how their removal can provide economic benefits, energy conservation and water conservation in both municipal and industrial settings.

- Describe the phenomenon of ionization and explain its significance in water treatment.

- Describe the test procedures normally associated with water treatment.

- Describe the principal methods used in external water treatment and evaluate them with reference to energy and water conservation.

- Describe the principal methods used in internal water treatment and evaluate them with reference to energy and water conservation.

- Discuss the use of water treatment in recirculating systems, steam boiler systems, humidification systems, control systems and cogeneration systems, and indicate how such treatment improves energy and water conservation.

- Explain how water treatment applies to health and safety, including sewage discharge.

- Describe the application of water treatment to potable and domestic water systems and to pool and spa systems for both commercial and residential uses.

- Provide guidance in the implementation of a water efficiency program in the buildings sector.

Cheating and Plagiarism
Each student should be aware of the College's policy regarding Cheating and Plagiarism. Seneca's Academic Policy will be strictly enforced.

To support academic honesty at Seneca College, all work submitted by students may be reviewed for authenticity and originality, utilizing software tools and third party services. Please visit the Academic Honesty site on for further information regarding cheating and plagiarism policies and procedures.

All students and employees have the right to study and work in an environment that is free from discrimination and/or harassment. Language or activities that defeat this objective violate the College Policy on Discrimination/Harassment and shall not be tolerated. Information and assistance are available from the Student Conduct Office at

Accommodation for Students with Disabilities
The College will provide reasonable accommodation to students with disabilities in order to promote academic success. If you require accommodation, contact the Counselling and Disabilities Services Office at ext. 22900 to initiate the process for documenting, assessing and implementing your individual accommodation needs.

BES700 is recommended but not required

Topic Outline
Introduction to Water Treatment

  • Water Sources and Impurities
  • Municipal Water Treatment Systems

Water Treatment Fundamentals
  • Corrosion
  • Scale Formation
  • Testing Methods for Building Operators

External Water Treatment
  • Pretreatment, Aeration and Chlorination
  • Filtration, Clarification and Precipitation
  • Ion Exchange, Dealkalization and Demineralization
  • Reverse Osmosis – Desalination

Internal Water Treatment
  • Hydronic Systems
  • Closed Recirculating Systems
  • Open Recirculating Systems
  • Storage and Startup Procedures for Open & Closed Recirculating Systems

Steam Boiler Systems
  • Pretreatment Equipment and Boiler Carry-over
  • Steam Boiler Water Treatment Programs
  • Steam Trap Operation and Maintenance
  • Storage Procedures for Steam Boilers

Humidification Systems
  • Introduction to Humidification Systems

Water and Energy Conservation
  • Closed and Open Recirculating Systems
  • Steam Boiler Systems
  • Thermal Storage Systems and Cogeneration Systems
  • Practices in External Water Treatment


Environmental Awareness
  • Health and Safety Procedures
  • Government Regulations

Other Systems
  • Potable and Domestic Systems
  • Pool and Spa Systems

Mode of Instruction
Traditional Classroom
Lectures, discussions in the classroom, video 

Independent learning with tutor support.  Instructor will contact you by email.

Prescribed Texts
BES 706 - Water Treatment, Seneca College, ISBN/Sku #: 0-00011-706-B.  Available from the Seneca Bookstore.

Correspondence students, your text fee is included and your text will be shipped to you.

Reference Material

Required Supplies

Promotion Policy

Grading Policy
A+ 90%  to  100%
A 80%  to  89%
B+ 75%  to  79%
B 70%  to  74%
C+ 65%  to  69%
C 60%  to  64%
D+ 55%  to  59%
D 50%  to  54%
F 0%    to  49% (Not a Pass)
EXC Excellent
SAT Satisfactory
UNSAT Unsatisfactory

For further information, see a copy of the Academic Policy, available online ( or at Seneca's Registrar's Offices.

Modes of Evaluation
Since this is a professional credit subject, marking standards reinforce professional practice by demanding legible, tidy work. Written projects should be well organized and grammatically correct, with proper spelling and punctuation. Late projects are penalized. Please obtain standards, dates and additional information from your instructor.

While attendance is not a formal part of the evaluation process, absenteeism will almost guarantee your inability to achieve a satisfactory grade, as there is no formal provision for make-up tests or projects you may miss.

To attain a passing grade for the subject, a student must complete and obtain a passing grade on all combined projects and tests during the term.  For further information on evaluation and academic standing, see a copy of the Academic Policy. They are available at Seneca Registration offices.

Grading is based on the following marking scheme:

Projects 20%
Midterms 40%
Finals 40%

Correspondence and Online
Project 1              30%
Project 2              30%
Final                      40%

Approved by: Denis Gravelle