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					 Automated Odor Control
Chemical Dosing Systems


      253 Wilbur Avenue
     Swansea, MA 02777
              OVERVIEW
What Causes Odor and Corrosion in
Wastewater Systems?
What are the Consequences of Not
Treating Hydrogen Sulfide?
How and Why Do You Treat or Prevent
Odors?
What Makes GTS’s System Better?
Actual Results in Clarksville, TN.
What Causes Odor and Corrosion in
Wastewater Systems?
Primary cause of odors in wastewater is hydrogen sulfide (H2S).
H2S tends to form in wastewater anywhere sewage is allowed to
go without oxygen for a significant amount of time.
The usual suspects are long force mains from pumping stations.
When sewage is discharged at the terminus of the force main the
turbulence allows liquid sulfide to become airborne.
Pumping Station                                     Air relief valve




                                                                       Discharge Manhole

                    Chemical Dosing System




                                                   Force Main


Wet Well with
Sewage Pump


            Diagrammatic View of a Pumping Station and Force Main
                                 Diagram not to scale
What are the Consequences of Not Treating
 Hydrogen Sulfide

  Worker Health and Safety
  Odor
  Corrosion and Destruction of Infrastructure
Worker Health and Safety
  H2S Toxicity Spectrum             ppm
                                     0.1
     Odor Threshold                  0.2
                                     3.0
                                           “Rotten Egg” Odor Alarm
     Offensive Odor                  5.0
                                     10    OSHA/ACGIH TWA Exposure limit
 Headaches/Nausea Throat and
        Eye Irritation
                                           Threshold of Serious Injury
                                     50
                                    100     Loss of Sense of Smell
 Conjunctivitis/Respiratory Tract
  Irritation/Olfactory Paralysis
                                    300
                                             Imminent Life Threat
                                    500
    Strong Nervous System
       Stimulation Apnea
                                    1000   Immediate Collapse With
 Death!!!           Death!!!                 Respiratory Paralysis
                                    2000
Odor           Rotten Eggs – H2S
 Properties
    Most noticeable of all
     odors
    Colorless toxic gas
    Moderately soluble in
     water
    pH, temperature, and
     turbulence driven
Diagram of Typical Cross
Section of Force Main with no
Odor Control Treatment. This
could cause the following odors
in local neighborhoods.
  Garlicky

  Skunk

  Decayed cabbage

  Fishy

  Rancid
Corrosion and Destruction of Infrastructure




   Hydrogen Sulfide Corrosion Damage of Common Wastewater
  Infrastructures: Left Photo of Wet Well, Right Photo of Manhole
                       H2S Vs the Life Expectancy of Reinforced Concrete Pipes
                           10
                           9       < 5 Years
Dissolved Sulfide (mg/L)




                           8
                                                        5-10 Years
                           7
                           6
                           5                             10-25 Years
                           4
                           3
                           2                                     25-50 Years
                           1
                                                                        > 50 Years
                           0
                                1 1.5 2        3    4      5        6        7       8
                                          Pipe Diameter (Feet)
Diagram of Typical Cross
Section of Force Main with no
Odor Control Treatment.
As shown on the Graph,
depending on the amount of
Hydrogen Sulfide in your
system, within 5 years can
cause as much as $1 million in
damage to infrastructure.
   An Ounce of Prevention is Worth a Pound of Cure

Cost of GTS System over 5 year period
Installation and Service Charge             $2500.00
Monthly Service Fee $400.00 X 60 months =   $24,000.00
Total                                       $26,500.00

Estimated Cost of Infrastructure Damage     $500k-$1 Mil
How and Why Do You Treat or Prevent Odors?
How:
 Most cost effective method is usually chemical treatment at
 the wet well.
 Most common chemical used is calcium nitrate (Bioxide).
 Other effective chemicals are sodium nitrate, iron salts,
 hydrogen peroxide.
 Conventional method is to drip chemical into wet well at a
 constant rate.
How and Why Do You Treat or Prevent Odors?
Why:
 Citizen Complaints
 Law suits
 Consent order
 Worker safety
 Sewer line and component failures
 Premature failure of system appurtances
How and Why Do You Treat or Prevent Odors?
How:
 Most cost effective method is usually chemical treatment at
 the wet well.
 Most common chemical used is calcium nitrate (Bioxide).
 Other effective chemicals are sodium nitrate, iron salts,
 hydrogen peroxide.
 Conventional method is to drip chemical into wet well at a
 constant rate.
  What makes the GTS system better?
Utilizing proprietary software and a patent pending
process, our system monitors the rate of change of the
wet well level to apply a chemical dose rate to meet the
system demand rather than a constant dose.
The GTS system saves significant amounts of chemicals
and therefore saves the customer significant amounts of
money.
The GTS system prevents harmful slug dosing of the wet
well during low flow periods. This makes alternative
chemicals to nitrate much more feasible to the customer.
Typical Odor Control Chemical Feed System
GTS Dosing System
                     Comparison of Typical Dose Rates for the GTSfor AWS
                     Comparison of Typical Chemical Dose Rates
                               System Conventional System
                            System VS vs. Conventional System
Chemical Dose Rate




                                            Time of Day

                                 GTS dose rate
                                  AWS              Conventional dose rate
                            Comparison

    CONVENTIONAL SYSTEMS                          GTS AUTOMATED SYSTEMS


Constant set dose rate is applied throughout   Dose rate automatically adjusted
the day to meet the peak demand.               throughout the day to meet the
                                               instantaneous demand.
Over doses most of the day, yet often under    Achieves consistent and efficient odor
doses during peak demand allowing odors.       control throughout day without over
                                               dosing.
Creates high concentrations of chemicals in    Maintains appropriate and safe chemical
the wet well during low sewage flow periods.   concentration in wet well.

Cannot adjust for differences between          Senses differences in daily flows and
weekdays, weekends, or holidays.               automatically adjusts dose rate.

Continuous duty increases run times and        Reduced heat, run times, and wear increase
reduces life of chemical metering pumps.       life of expensive chemical pumps.
        Actual Results in Clarksville, TN

The GTS system is currently installed in
Clarksville, TN at the Sugar Tree pumping
station and has lowered their chemical
consumption by greater than 50 percent. The
savings at this site equate to around $11,000
per year.
Initial testing at additional sites in Clarksville are
also showing 50 percent or greater reductions in
chemical usage.

				
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posted:4/10/2011
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