Germicidal Treatment of Wastewater Effluent-Eliminate TRC Concerns

Jeffrey Havelin, P.E.

Course Outline

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 (Total Residual Chlorine) TRC levels, this course will provide you with basic information you will need.

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 also 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.

This course is based entirely on the following (2) two EPA documents entitled: "Wastewater Technology Fact Sheet -Ultraviolet Disinfection" Publication - EPA 832-F-99-064 and "Wastewater Technology Fact- Dechlorination" Publication- EPA 832-F-00-022. This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of course materials. You will be quizzed on the attached (2) documents in their entirety.

Learning Objective

This course reviews the following topics:

• Understand how UV exposure effects the cells of infectious agents;
• Review the basic types of UV reactor configurations;
• Discuss the optimum wavelengths and intensities required for germicidal use of UV;
• Review wastewater characteristics, which affect UV disinfection performance;
• Review actual case studies on existing treatment plants;
• Chemistry of dechlorination by sulfonation;
• Required equipment for gaseous sulfonation;
• Learn how to estimate daily required dosage of SO2; and
• Review use of sulfite salts in lieu of gaseous sulfonation.
  

Intended Audience

This course would be very informative for engineers who are involved with the design, or operation of sewage treatment facilities.

Benefit for Attendee

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, when chlorine is used as a germicidal agent.

Course Introduction

This course will review germicidal procedures, which engineers who are involved with the design, or operation of sewage treatment facilities would use in the final treatment of wastewater effluent.

The course will review dechlorination procedures, which will reduce the TRC levels to an acceptable range when chlorine is used as a germicidal agent, and it will also review UV treatment as a germicide.

Course Content

This course is based entirely on the two following EPA documents.

"Wastewater Technology Fact Sheet -Ultraviolet Disinfection" - EPA 832-F-99-064

"Wastewater Technology Fact- Dechlorination" - EPA 832-F-00-022

You need to open or download above documents to study this course.

Course Summary

At the completion of this class the design professional will be informed about UV disinfection procedures, and optional germicidal treatment with chlorine which typically requires subsequent dechlorination treatment.

Quiz

Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.

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DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDH Center or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered architect and/or professional engineer/surveyor. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.

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