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TRANSCRIPT
Do Cation Exchange Systems Affect the Chlorination Process?
Presented By:
Jeffrey W. Freeman, P.E., CFM, LEED APEngineering Enterprises, Inc.
March 22, 2016
Presentation Overview
Ebony-Ammonia & Ammonium-Ivory
Gimme A Breakpoint
Holy # of Test Methods
Cation Exchange Treatment Exposed
Presentation Overview (Cont.)
Evidence
More Evidence
Take That, Variable Ammonia!
Acknowledgements and Q&A
Ebony-Ammonia & Ammonium-Ivory
Ebony-Ammonia & Ammonium-Ivory
Ammonia Dissolution In Water
NH3 + H2O NH4+ + OH-
Total Ammonia NH3 + NH4+
Free Ammonia NH3 Only
Ammonia Ammonium
pKa = 9.25
Ebony-Ammonia & Ammonium-Ivory
Source: Manual for Bosanska Krupa Nov. 2009
Ammonia & Ammonium DissolutionpH = 9.25; Temperature = 20OC
9.25
Ebony-Ammonia & Ammonium-Ivory
Source: Manual for Bosanska Krupa Nov. 2009
Ammonia & Ammonium DissolutionpH = 9.25; Temperature = 20OC
7.5
Ebony-Ammonia & Ammonium-Ivory
Monochloramine Development
NH3 + HOCl NH2Cl + H2O
Dichloramine Development
NH2Cl + HOCl NHCl2 + H2O
Nitrogen Trichloride Development
NH2Cl + HOCl NCl3 + H2O
Chloramine Chemistry
Gimme a Breakpoint
Gimme a Breakpoint
Breakpoint Chlorination Overview
Chlorine Added
Total Chlorine Re
sidual
Breakpoint
Hump
Gimme a Breakpoint
Breakpoint Chlorination Overview (Cont.)
Chlorine Added
Total &
Free Am
mon
ia
Total Chlorine Re
sidual
Free Ammonia
Total Ammonia
MonochloramineTo Dichloramine
TotalChlorine
MonochloramineDevelopment
DichloramineTo N‐ Trichloride
NitrogenTrichloride
FreeChlorine
TotalChlorine
Gimme a Breakpoint
Breakpoint Chlorination Overview (Cont.)
Chlorine Added
Total &
Free Am
mon
ia
Total Chlorine Re
sidual
Free Ammonia
Total Ammonia
MonochloramineTo Dichloramine
TotalChlorine
Monochloramine DichloramineTo N‐ Trichloride
NItrogenTrichloride
FreeChlorine
TotalChlorine
Cl2:NH3‐N<5:1 Cl2:NH3–N>5:1 Cl2:NH3 –N>7.6 ‐ 9:1
Cl2:NH3–N = 5:1 Cl2:NH3–N = 7.6 ‐ 9:1
Gimme a Breakpoint
Five (5) Recommended Parameters To Confirm Breakpoint Has Been Achieved: Free Ammonia
Total Ammonia
Monochloramine
Total Chlorine
Free Chlorine
Holy # of Test Methods
Holy # of Test Methods
Typical Ammonia Test Methods Nessler Method: No Longer
Standard Method Approved Salicylate Method: Recommend
For Total Ammonia Indophenol Method:
Recommend For Free Ammonia & Monochloramine
Ion Selective Electrode: Ideal Method For Precision, But Higher Capital & O&M Costs
Holy # of Test Methods
Typical Chlorine Test Methods DPD (N,N Diethyl-1,4 Phenylendediamine Sulfate)
Recommended For Total Chlorine and Free Chlorine, If Breakpoint Achievement Has Been Confirmed
Used With Many Test Kits/Analyzers Free Chlorine Must Be Read Within a Minute of Sample
Preparation Total Chlorine To Be Read Within 3 – 5 Minutes After Sample
Prepared
Indophenol Recommended For Free Chlorine Confirmation It Is Not An IEPA Approved Method For Free Chlorine
Measurement
Holy # of Test Methods
DPD Free Chlorine Test Method Additional Comments Chloramines Are Known To Interfere With the Free Chlorine DPD
Method The Longer The Sample Sits, the Greater the Amount of Interference Occurs
DPD Method Is Accurate When Chloramines Are Not Present
Excerpts From Hach DPD Free Chlorine Test Method Instructions
Holy # of Test Methods
Indophenol Free Chlorine Test Method Additional Comments It Is Not An IEPA Approved Test Method Chloramines Do Not Interfere With Method It Is a Good Check To Confirm Past Breakpoint
Excerpts From Hach Indophenol Free Chlorine Test Method Instructions
Cation Exchange Treatment Exposed
Cation Exchange Treatment Exposed
Cation Exchange Treatment Summary General Definition of Ion Exchange Treatment
(Source: New Hampshire Department of Environmental Services):
Ion exchange (IE) is a water treatment method where one or more undesirable contaminants are removed from water by exchange with another non-objectionable, or less objectionable substance. Both the contaminant and the exchanged substance must be dissolved and have the same type (+,-) of electrical charge.
Cation Exchange (CE) Treatment Targets Cations Ions With + Charge
Typical Regenerant is Sodium Chloride (NaCl)
Cation Exchange Treatment Exposed
Typical Target Cations In NE IL
Source: http://science notes.org/use‐periodic‐table/
+1+2
HardnessCations
Barium &Radium
Sodium
Lead 2+
Iron 2+
Copper 2+
Zinc 2+
Cation Exchange Treatment Exposed
Affinity (/əˈfinədē/): [Biochemistry]the degree to which a substance tends to combine with another. (Source: www.google.com)
Source: Water Quality & Treatment, AWWA
Cation Exchange Treatment ExposedIon Exchange General Exchange Process
HARDNESS CATIONS
Ra2+
Ba2+
Ca2+
Mg2+
NH4+
Na+
SchematicCation
Exchange Resin Bead
Radium
Barium
Calcium
Magnesium
Ammonium
Sodium
Na+
Na+Na+
Na+Na+Na+
Na+
Na+Na+
Na+Na+Na+Na+Na+
Na+
Na+
Na+
Na+Na+
Na+ Na+
Na+
Na+
Ca2+ Ca2+ Ca2+ Mg2+ Mg2+ Mg2+
SchematicCation
Exchange Resin Bead
Cation Exchange Treatment ExposedIon Exchange General Exchange Process
RADIUM & BARIUM CATIONS
Ra2+
Ba2+
Ca2+
Mg2+
NH4+
Na+
Radium
Barium
Calcium
Magnesium
Ammonium
Sodium Na+Na+
Na+Na+
Na+Na+
Na+
Na+Na+
Na+ Na+
Ca2+
Ca2+
Ca2+ Mg2+
Mg2+
Mg2+
Ra2+ Ra2+ Ba2+ Ba2+
SchematicCation
Exchange Resin Bead
Cation Exchange Treatment ExposedIon Exchange General Exchange Process
AMMONIUM CATIONS
Ra2+
Ba2+
Ca2+
Mg2+
NH4+
Na+
Radium
Barium
Calcium
Magnesium
Ammonium
Sodium Na+Na+
Na+
Na+Na+
Na+ Na+
Ca2+
Ca2+ Mg2+
Mg2+
Ra2+
Ra2+
Ba2+
Ba2+
NH4+ NH4
+
SchematicCation
Exchange Resin Bead
Cation Exchange Treatment ExposedIon Exchange General Exchange Process
MORE HARDNESS CATIONS
Ra2+
Ba2+
Ca2+
Mg2+
NH4+
Na+
Radium
Barium
Calcium
Magnesium
Ammonium
SodiumNa+
Na+ Na+
Ca2+
Ca2+ Mg2+
Mg2+
Ra2+
Ra2+
Ba2+
Ba2+NH4+
NH4+
Ca2+ Mg2+
Na+Na+
SchematicCation
Exchange Resin Bead
Cation Exchange Treatment ExposedIon Exchange General Exchange Process
REGENERATION
Ra2+
Ba2+
Ca2+
Mg2+
NH4+
Na+
Radium
Barium
Calcium
Magnesium
Ammonium
Sodium Na+
Ca2+
Ca2+ Mg2+
Mg2+
Ra2+
Ra2+
Ba2+
Ba2+NH4+
Ca2+ Mg2+
Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+
Na+ Na+
Na+ Na+
Na+ Na+
Na+ Na+
Na+ Na+
Na+ Na+
Na+
Cation Exchange Treatment Exposed
Ion Exchange WTP Process Flow Schematic
Water DistributionSystem
Backwash SurgeTank
WellNo. 1
Meter
SanitarySewerSystem
WellNo. 2
CationExchangeUnits
NaClRegeneration
System
Meter
Fl PO4 Cl2
Meter
Meter
Flow Control Valve
Bypass
Meter
Evidence
Evidence
Theory Confirmation No. 1 Village of Montgomery Wells No. 14 &
15 WTP Background Well No. 14 Ironton Galesville DSS
Well Raw Water Hardness = 235 mg/l as CaCO3
Combined Radium = 6.6 pCi/l
WTP Contains Five (5) CE Units With Bypass
Flouride, Polyphosphate and Chlorine Gas Added After CE Units
Treated Water Distributed Directly Into System
Evidence
Theory Confirmation No. 1 (Cont.) Sampling & Testing Summary
Occurred Every 30 Minutes From 8:00 AM – 2:00 PM on April 3, 2013
Testing Locations Raw Water Post CE/Pre-Chlorination Composite Finished
Tested For Five (5) Test Parameters – Free & Total Ammonia, Chloramine, Free & Total Chlorine
Note: Chlorine Dose = 1.9 mg/l
Evidence
Wells No. 14 & 15 WTP Sample Locations
WellNo. 14
Meter
WellNo. 15
CationExchangeUnits
Meter
Fl PO4 Cl2
Meter
Flow Control Valve
BypassMeter
Raw
Post CE / Pre‐Chlor
(Composite)
Finished
Evidence
Raw Water Ammonia LevelsWELL NO. 14 AND WELLS NO. 14 & 15 WTP
Evidence
Raw & Post CE / Pre-Chlor Ammonia LevelsWELL NO. 14 AND WELLS NO. 14 & 15 WTP
Evidence
Finished Ammonia & Chloramine LevelsWELL NO. 14 AND WELLS NO. 14 & 15 WTP
Mono To Di Near BP Mono To Di
Evidence
Finished Ammonia & Chlorine LevelsWELL NO. 14 AND WELLS NO. 14 & 15 WTP
Mono To Di Past BP Mono To Di
Evidence
Raw & Finished Ammonia & Chlorine LevelsWELL NO. 14 AND WELLS NO. 14 & 15 WTP
Evidence
Finished Chlorine ResidualsWELL NO. 14 AND WELLS NO. 14 & 15 WTP
More Evidence
More Evidence
Theory Confirmation No. 2 Village of Montgomery Well No. 8 WTP Background
Well No. 8 Ironton Galesville DSS Well Raw Water Hardness = 210 mg/l as CaCO3
Combined Radium = 11.5 pCi/l
WTP Contains Three (3) CE Units With Bypass Flouride, Polyphosphate and Chlorine Gas Added After CE Units Treated Water Distributed Directly Into System
More Evidence
Theory Confirmation No. 2 (Cont.) Sampling & Testing Summary
Occurred Every 30 Minutes From 8:00 AM – 2:00 PM on May 20, 2013
Testing Locations Raw Water Post CE/Pre-Chlorination Finished
Tested For Five (5) Test Parameters – Free & Total Ammonia, Chloramine, Free & Total Chlorine
Note: Chlorine Dose = 1.9 mg/l
More Evidence
Well No. 8 WTP Sample Locations
WellNo. 14
Meter
CationExchangeUnits
Fl PO4 Cl2
Meter
Flow Control Valve
BypassMeter
Raw
Post CE / Pre‐Chlor
(Composite)
Finished
More Evidence
Raw Water Ammonia LevelsWELL NO. 8 AND WELL NO. 8 WTP
More Evidence
Raw & Post CE / Pre-Chlor Ammonia LevelsWELL NO. 8 AND WELL NO. 8 WTP
Total NH3 @ 13:30Softener 1: 0 mg/lSoftener 2: 0 mg/lSoftener 3: 2.1 mg/l
Softener 3In
Regen.
More Evidence
Mono To DiBP Achieved Near BP
Finished Ammonia & Chlorine LevelsWELL NO. 8 AND WELL NO. 8 WTP
Mono
More EvidenceRaw & Finished Ammonia & Chlorine Levels
WELL NO. 8 AND WELL NO. 8 WTP
More Evidence
Finished Chlorine ResidualsWELL NO. 8 AND WELL NO. 8 WTP
Take That, Variable Ammonia!
Take That, Variable Ammonia!
Wells No. 14 & 15 WTP Sample Locations
WellNo. 14
Meter
WellNo. 15
CationExchangeUnits
Meter
Fl PO4
Cl2
Meter
Flow Control Valve
BypassMeter
Ammonia &Monohloramine
Analyzer
FreeChlorineAnalyzerPLC
Acknowledgements and Q&A
A Big Thank You To:
Village of Montgomery
Bob Spon (Spon Water Consulting)
Terry Engelhardt (Hach)
Jeffrey W. Freeman, P.E., CFM, LEED APVice PresidentEngineering Enterprises, [email protected](630) 466-6700
Acknowledgements and Q&A