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UV or Dechlorination of Wastewater -
Eliminating Residual Chlorine Concerns
Jeffrey Havelin, P.E.
Overview
Chlorination has been widely used as a germicidal agent in the final treatment
of wastewater since the passage of the 1972 Federal Water Pollution Act-FWPA.
Recent changes in regulations are mandating reduced chlorine levels in
wastewater outflows since studies have indicated that chlorine can be toxic to
aquatic life and harmful to the shellfish industry.
This
course will introduce the student to UV disinfection as an alternative, which
will totally eliminate the use of chlorine and all concerns about the Total
Residual Chlorine TRC levels. This course will also introduce the student to
the optional dechlorination process, which will chemically remove total
dissolved chlorine from wastewater before it enters the outflow pipe.
If you are involved with wastewater treatment and
you wish to become familiar with dechlorination procedures and UV treatment or
you are concerned about reduction of TRC levels, this course will provide you
with basic information you will need.
This course will review
the basics of UV treatment of wastewater, which eliminates the chlorination
process, and dechlorination procedures, which will reduce the TRC levels to an
acceptable range.
The student must take a
multiple-choice quiz consisting of twenty (20) questions at the end of this course to earn PDH credits.
Specific Knowledge or Skill Attained
This course teaches the following specific knowledge and
skills:
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Understand how UV exposure effects the cells of infectious agents
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Review the basic types of UV reactor configurations
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Discuss the optimum wavelengths and intensities required for germicidal use of
UV
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Review wastewater characteristics, which affect UV disinfection performance
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Review actual case studies on existing treatment plants
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Chemistry of dechlorination by sulfonation
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Required equipment for gaseous sulfonation
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Learn how to estimate daily required dosage of
SO2
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Review use of sulfite salts in lieu of
gaseous sulfonation
Course
Click on the PDF attachment
below to review the following prior to taking a quiz for credit:
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"Wastewater Technology Fact-
Dechlorination” - EPA 832-F-00-022
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“Wastewater
Technology Fact Sheet -Ultraviolet Disinfection” - EPA 832-F-99-064
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Appendix A - "Excerpt from an Actual SPDES Permit Which Includes New
Requirements for TRC Levels
Alternative Treatments of Wastewater (237 KB)
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To obtain PDH credits for this course, you will need to take a quiz for
credit. Click on the link below.
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