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OWWA/OMWA Joint Annual Conference May 5 – 8, 2013 Ottawa, Ontario Killaloe Water System, AVIVE TM Water Treatment and Huwa-San Peroxide. Andy K. Valickis, P.Eng. Jim Shubat May 7, 2013. Problem. To find a cost effective solution to reduce the high level of THMs in the Killaloe Water System.

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OWWA/OMWA Joint Annual ConferenceMay 5 – 8, 2013Ottawa, OntarioKillaloe Water System, AVIVETM Water Treatment andHuwa-San Peroxide

Andy K. Valickis, P.Eng.

Jim Shubat

May 7, 2013

problem
Problem

To find a cost effective solution to reduce the high level of THMs in the Killaloe Water System

killaloe water system
Killaloe Water System
  • Small system – only 90+ connections
    • Owned by the Township of Killaloe, Hagarty and Richards
    • Operated by OCWA
  • Groundwater wells
    • GUDI with in-situ filtration
    • Treatment for iron and manganese removal
    • UV discharging to clearwells
  • Long residency time in clearwells and distribution system (3 to 5 days)
    • THM levels near or over the 100 µg/L limit
    • Individual samples as high as 140 µg/L
solution
Solution
  • AVIVETM Water Treatment system from SanEcoTec
  • Using Huwa-San peroxide (HSP) New form of stabilized peroxide that maintains its residual (equivalent if not better than chlorine)
    • NSF approved as a residual for drinking water
    • Used successfully in Europe in drinking water since 2004
  • Use HSP for secondary disinfection in the clearwells and distribution system
    • No chlorine to produce THMs
advantages of avive tm and hsp
Advantages of AVIVETM and HSP
  • Does not breakdown to form THMs or other chlorine based DBPs
  • Attacks biofilm on pipe walls
    • Very strong oxidizer
  • Longer lasting residual
  • Easy to use for operators
    • Similar to sodium hypochlorite
  • No chlorine taste in the drinking water
    • Significant consumer acceptance
project approach
Project Approach
  • Met with MOE (regulators)
    • Essential to get their buy-in
  • Sold the concept to the Township staff and Council
    • Including our own operations staff
  • Numerous consultation meetings with MOE Approvals and Health Unit staff
  • Undertook baseline monitoring and sampling
  • Public notification
baseline monitoring and sampling
Baseline Monitoring and Sampling
  • THM formation
    • Historical THM concentration data available but not where along the process are the majority of the THMs formed
    • Undertook jar testing to develop a baseline and confirm HSP works
  • ATP testing of the existing system
    • Baseline of microbial activity within distribution system
    • Undertaken over a number of weeks
  • Other testing
    • HPC, Total Coliform, E.Coli
    • Metals testing (copper, lead, iron, manganese)
  • Residential hot water systems
atp testing luminultra
ATP Testing - Luminultra
  • Measures Adenosine Triphosphate
    • A chemical found in living microorganisms
    • Quantitative indication of microbial activity in a sample
    • Results in 5 minutes
    • Indication of the amount of biofilm on pipe walls
  • Testing equipment loaned to this project by Luminultra
    • Sampling and testing undertaken by staff from OCWA and Fleming College’s CAWT
system design
System Design
  • Still need chlorine to achieve CT requirements
    • Chlorine added to incoming raw well water
    • Used residency time in contactor tanks and pipes (before UV) to achieve CT
  • HSP added immediately after UV system
    • Measure chlorine levels then adjust HSP dosing to quench chlorine + enough to maintain minimum secondary disinfection residual of 3 mg/L
    • With the quenching of the chlorine, THM formation immediately ceases
  • Issue of backwashing contactors with “peroxidated” water
    • Filter to waste until chlorine levels restored
moe approvals
MOE Approvals
  • Regulatory Relief
    • Sections from O. Reg. 170/03 under the Safe Drinking Water Act
  • Amendment to the DWWP
    • Additional sampling and reporting for initial 3 months
    • Voluntary sampling (i.e. residential hot water systems)
equipment
Equipment
  • Very similar to what is required for feeding and monitoring sodium hypochlorite
    • Chemical feed pumps (off the shelf)
    • Peroxide residual monitors (supplied by Kramer)
    • Handheld units for sampling in distribution system
results
Results
  • HSP system was commissioned and went live in late November 2012
  • Immediate THM reduction
    • Initially down to 25-27 µg/L range
    • Current levels are in the 20-23 µg/L range
  • HSP residuals maintained throughout the distribution system
  • Water quality during the changeover was not affected
  • HAAs were also significantly reduced
    • Before 55 to 67 µg/L range; after 8.4 µg/L
atp testing results
ATP Testing Results

Pre-HSP

Post-HSP

conclusions
Conclusions
  • Project a big success!
    • Significant reduction in the DBPs produced
    • Proved HSP can retain a disinfecting residual equivalent to or better than chlorine
    • Significant consumer acceptance of their “new” tap water
  • We finally have a viable alternative to chlorinating our water supplies