Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite...
-
Upload
nguyenminh -
Category
Documents
-
view
215 -
download
0
Transcript of Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite...
![Page 1: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/1.jpg)
Corrosion Control: Calcite or Limestone Contactors for Remineralization Downstream from Membrane Treatment
NC AWWA-WEANovember 2017
![Page 2: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/2.jpg)
Introduction
Mark Machacek, PETonka WaterTerritory Manager, South Eastern United States
![Page 3: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/3.jpg)
Tonka Water Experience
Established in 1956, Tonka Water has extensive experience in water treatment with just under 2500 installations.
Our water treatment expertise includes applications in surface water, groundwater, tertiary water filtration, environmental remediation, commercial and industrial projects.
We pride ourselves on delivering quality systems, with a solid base of technology and a strong commitment to meeting customer needs
![Page 4: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/4.jpg)
Tonka Water has just under 2500 individually designed water treatment systems for municipalities across North America.
![Page 5: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/5.jpg)
WHAT IS A CALCITE CONTACTOR?
![Page 6: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/6.jpg)
Calcite Contactors
Like Tums for your water system
![Page 7: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/7.jpg)
Membrane Systems
Nanofiltration and Reverse Osmosis (NF/RO) reduce total dissolved solids (TDS)
But, also remove hardness and alkalinity - lowering pH
Can result in corrosive watero Langelier Saturation Index (LSI)o Calcium Carbonate Precipitation Potential (CCPP)
Add hardness/alkalinity back in - remineralization
![Page 8: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/8.jpg)
Remineralization Options
Chemical Feedo Lower capital, but can be operationally expensive,
potential for overfeeding
Limeo Messy, less economical
Calcium Carbonateo aka crushed limestone, or calciteo Self-limiting: pH adjustment only to equilibriumo Easy operationo Economical
- 50% lime costs- 50% less CO2 required than lime
![Page 9: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/9.jpg)
Calcite (crushed limestone)
Remineralization using calcite and CO2
H2O + CO2 + CaCO3 → Ca+2 + 2HCO3-
Remineralization using calcite and sulfuric acid
H2SO4 + CaCO3→ CaSO4 + H2O + CO2H2O + CO2 + CaCO3 → Ca+2 + 2HCO3
-
Summary: 2CaCO3 + H2SO4 → Ca+2 + 2HCO3- + CaSO4
![Page 10: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/10.jpg)
Typical Contactor System
NF/RO Membrane
Calcite Contactor
Bypass (Optional)
pH
Concentrate
Permeate
pH pH
CO2 or Sulfuric acid
Sodium Hydroxide
![Page 11: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/11.jpg)
DESIGN CONSIDERATIONS
![Page 12: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/12.jpg)
Example Section
![Page 13: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/13.jpg)
Design Conditions
Upflow operation 3-6 gpm/ft2 service loading rate 8-12 gpm/ft2 backwash (or high rate flush)
o Target: 35% expansion
Freeboard: 50% bed expansion Bed depth: As needed, but depths vary from
24” to 60”o Rule of thumb: 10-30 min EBCT
![Page 14: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/14.jpg)
Modeling
0
0.2
0.4
0.6
0.8
1
1.2
1.4
5.00 6.00 7.00 8.00
Calc
ite B
ed D
epth
pH
Critical inputso pHo CO2
o Alkalinityo Hardnesso Temperatureo Total dissolved solids
(TDS)o Upflow velocityo Calcite particle size /
characteristics
![Page 15: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/15.jpg)
Bed Depth
5.00 6.00 7.00 8.00
Calc
ite B
ed D
epth
pH
![Page 16: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/16.jpg)
Calcite Type and Size
Properties:Size, Uniformity, Purity, Roundness, Specific
Gravity/Density, NSF Certification
![Page 17: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/17.jpg)
Vertical Pressure Vessels
![Page 18: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/18.jpg)
Horizontal Pressure Vessels
![Page 19: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/19.jpg)
Service Flow Pressure Drop
from Clack Corporation datasheet
![Page 20: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/20.jpg)
INSTALLATION REVIEW
![Page 21: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/21.jpg)
Mosquito First Nation, CanadaStart-up: October 2014
Design flow of 108 gpmOne (1) 5ft diameter x 7ft6in tall HDPE tank, 48” bed depth Engineering: Associated Engineering
Inlet OutletpH 6.2 8.25
Hardness (mg/l as CaCO3) 12.2 80
Alkalinity (mg/l as CaCO3) 16.2 89
![Page 22: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/22.jpg)
Craven County, North CarolinaStart-up: September 2017
Design flow of 3.0 MGDTwo (2) 12ft diameter x 30ft long isolated cell horizontal vesselsEngineering: McKim & Creed
![Page 23: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/23.jpg)
Craven County, North CarolinaStart-up: September 2017
Inlet Outlet
pH 6.2 7Hardness (mg/l as CaCO3) 2.3 45-50
Alkalinity (mg/l as CaCO3) 3 55-65
![Page 24: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/24.jpg)
Craven County, North CarolinaCalcite Loading
![Page 25: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/25.jpg)
New Providence, BahamasStart-up: November 2017
Design flow of 1.3 MGDOne (1)12ft diameter x 34ft long isolated cell horizontal vesselEngineering: King Engineering
![Page 26: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/26.jpg)
New Providence, BahamasStart-up: November 2017
Design flow of 1.3 MGDOne (1)12ft diameter x 34ft long isolated cell horizontal vesselEngineering: King Engineering
Inlet OutletpH 5.8 8-9
Hardness (mg/l as CaCO3) 1 >60
Alkalinity (mg/l as CaCO3) 1 >60
TDS 225 <500
![Page 27: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/27.jpg)
Brunswick Regional, NCStart-up: 2018
Design flow of 4.0 MGDTwo (2) 12ft diameter x 36ft long isolated cell horizontal vesselEngineering: Wooten Co.
![Page 28: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/28.jpg)
Brunswick Regional, NCCalcite Loading
Design flow of 4.0 MGDTwo (2) 12ft diameter x 36ft long isolated cell horizontal vesselEngineering: Wooten Co.
![Page 29: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/29.jpg)
WHAT’S NEXT?
![Page 30: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/30.jpg)
Simul-Wash™
Simul-Wash™ is the only sustained backwash process using collapse pulsing technique
Uses up to 50% less water Extended media life Versatile: applicable in
vertical or horizontal tanks and retrofits
Smaller backwash chamber reduces plant footprint
![Page 31: Corrosion Control: Calcite or Limestone Contactors for ... · oaka crushed limestone, or calcite oSelf-limiting: pH adjustment only to equilibrium oEasy operation oEconomical - 50%](https://reader031.fdocuments.in/reader031/viewer/2022021823/5b4f53a17f8b9a206e8c20d6/html5/thumbnails/31.jpg)
Contact Us
Mark Machacek, PE Tonka Water
13305 Watertower CirclePlymouth, MN 55441
Main: 763-276-0818 Email: [email protected] Website: www.tonkawater.com