Disinfection of water and wastewaters
Following a brief introduction to the basic physical and chemical
properties of water, this unit 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
- Mechanical disinfection processes - land treatment, sand
filtration, membrane filtration [microfiltration, ultrafiltration,
nanofiltration and MBRs] and reverse osmosis
Note: The content of this unit 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
Download the Unit Handbook from the panel on the right.
Provisional start dates for Disinfection are:
w/c 11th May 2015 book now
w/c 7th September 2015 book now
w/c 23rd November 2015 book now
The cost of the unit is £195 (+ VAT). This unit has a learning
time equivalent to 6 hours spread over 3-4 weeks.
If you have any questions please email Jenny Dyer or call 020
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 unit although substitutions can be
made at any time.