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Potable Water -
Disinfection
Edward Brunet, Jr., P.E.
Overview
Disinfection is used to kill or inactivate disease-causing organisms in a
potable water supply. The EPA Surface Water Treatment Rule (SWTR) requires
systems using public water supplies from either surface water or groundwater
under the direct influence of surface water to disinfect the water.
There are a number of different disinfection options available to the design
engineer. The oldest and most widely used method of disinfection is the
use of chlorine. Chlorine is very effective as a disinfectant, but can
produce undesirable disinfection by-products. Newer disinfection
technologies, such as ozone and UV disinfection, produce little or no
disinfection by-products. However, these technologies have a disadvantage
relative to chlorine in that they provide no residual disinfection in the water
distribution system after initial treatment. Thus, recontamination is a
concern unless chlorine is used as a secondary disinfectant to provide residual
protection.
In
this course the student will review the technical briefs Disinfection,
Ozone, and Ultraviolet Disinfection
published by the National Drinking Water Clearinghouse. This course is particularly
relevant to engineers involved in the design and selection of water treating
and/or distribution systems, as well as engineers who are simply interested in
learning more about disinfection of potable water systems.
The student must take a
multiple-choice quiz consisting of fifteen questions at the end of
this course to obtain PDH credits.
Specific Knowledge or Skill Attained
This course teaches the following specific knowledge and
skills:
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Why disinfection of
potable water is necessary
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The regulatory
requirements for disinfection of potable water
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The different forms
of chlorine available and their relative advantages and disadvantages for use
as a potable water disinfectant
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The advantages and
limitations of using ozone as a disinfectant and the methods for producing
ozone on-site
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The advantages and
limitations of using UV disinfection, as well as the major components of a UV
unit.
Course
Click on the following PDF attachment and
review technical briefs Disinfection, Ozone, and Ultraviolet
Disinfection
published by the National Drinking Water Clearinghouse prior to taking a quiz
for credit.
"Potable
Water Disinfection" (552 KB)
Having Trouble Downloading the PDF File?
Right click on the link. Select "Save Target As..."
Then save on your desktop. To view the file, double click the icon on your
desktop and return to this page to take the quiz.
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Click on the link below to download a free copy of Acrobat Reader.
To obtain PDH credits for this course, you will need to take a quiz for
credit. Click on the link below.
(To take the quiz,
your web browser must be set to accept cookies. See how to
check your cookie settings.)
 
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