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Disinfection Methods for CSO Treatment
Raymond Ehrhard, P.E.
Overview
Combined sewer overflows (CSOs) occur when flows
exceed the hydraulic capacity of either the wastewater treatment plant (WWTP) or
the collection system that transports the combined flow of storm water and
sanitary sewage to the WWTP. When an overflow occurs, the excess flows tend to
be discharged into a receiving body of water. CSOs typically discharge a
variable mixture of raw sewage, industrial/commercial wastewater, polluted
runoff, and scoured materials that build up in the collection system during dry
weather periods. These discharges contain a variety of pollutants that may
adversely impact the receiving water body, including pathogenic microorganisms,
viruses, cysts, and chemical and floatable materials.
Following solids reduction, most systems further
reduce bacterial concentrations through disinfection. Chlorine has long been
the disinfectant of choice for most disinfection systems. This course looks at
alternatives to chlorine that have been developed and evaluated for continuous
disinfection of wastewater discharges and treatment for CSOs.
In this course the student will learn of the
alternative disinfection technologies being evaluated and what their advantaged
and disadvantages are. The course is suitable for a student with basic
wastewater treatment knowledge or for an advanced student that needs to evaluate
alternative disinfection alternatives for CSO treatment.
The student is expected to read and review the
material contained in the Combined Sewer Overflow Technology Fact Sheet,
Alternative Disinfection Methods UPEPA, EPA 832-F-99-033
The student must take a
multiple-choice quiz consisting of twelve (12) 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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General requirements
of the USEPA Clean Water Act
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Water chemistry
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Wastewater treatment
technologies
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Wastewater treatment
terminology
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Alternative
disinfection technologies
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Support information
for choosing alternative technologies
Course
Click on the following PDF attachment
and review the source document prior to taking a quiz for credit.
Alternative Disinfection CSO (125 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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