Disinfection – Water and Wastewaters

Following a brief introduction to the basic physical and chemical properties of water, this module will cover disinfection of both potable water (for drinking) and wastewaters (prior to discharge). We consider biological contamination, including the nature of pathogens and their origins, why disinfection is necessary, and then go on to examine the theory of disinfection and include an explanation of Chick’s law, ct values and breakpoint chlorination. The underpinning legislation and regulatory framework relating to the biological quality of drinking water and discharges to the aquatic environment are also reviewed, along with discharge and drinking water standards including maximum allowable concentrations [MACs] and organoleptic issues.

Various approaches to disinfection are addressed:

  • Chemical disinfection – coagulation/flocculation as precursors to the disinfection process; the advantages and disadvantages of chlorine-based disinfectants, ozone and other chemicals that can be used in particular circumstances and environments. Chemical disinfection byproducts including THMs
  • Physical disinfection processes including heat, UV and sunlight – use of ponds/lagoons and photocatalysis with titanium dioxide
  • Mechanical disinfection processes – land treatment, sand filtration, membrane filtration [microfiltration, ultrafiltration, nanofiltration and MBRs] and reverse osmosis

Note: The content of this module relates to aspects of both drinking water and wastewater treatment and there is inevitably some overlap with material contained within both the municipal wastewater treatment and the potable water treatment modules.

The start dates are:

The cost of the module is £275.00 (inc. VAT). This module has a learning time equivalent to 6 hours spread over 3-4 weeks.

If you have any questions please email  Alex Moon or call 020 7831 3110.

CIWEM reserve the right to cancel any start date if there are insufficient registrants. No refunds can be made less than 14 days prior to the commencement of the module although substitutions can be made at any time.


“…a very useful grounding of the various options available for disinfection. I particularly value the extensive hyperlinks to additional material which when followed allow a much more in-depth information to be gained where it is required…