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Earning your trust through reliable and efficient water management services. OWWA/OMWA Joint Annual Conference May 5 – 8, 2013 Ottawa, Ontario Killaloe.

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Presentation on theme: "Earning your trust through reliable and efficient water management services. OWWA/OMWA Joint Annual Conference May 5 – 8, 2013 Ottawa, Ontario Killaloe."— Presentation transcript:

1 Earning your trust through reliable and efficient water management services. 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

2 2 Problem To find a cost effective solution to reduce the high level of THMs in the Killaloe Water System

3 3 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 µ g/L limit –Individual samples as high as 140 µ g/L

4 4 Solution AVIVE TM 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

5 5 Advantages of AVIVE TM 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

6 6 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

7 7 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

8 8 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 Colleges CAWT

9 9 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

10 10 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)

11 11 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

12 12 Results HSP system was commissioned and went live in late November 2012 Immediate THM reduction –Initially down to µ g/L range –Current levels are in the µ g/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 µ g/L range; after 8.4 µ g/L

13 13 HSP Residuals

14 14 THM Reduction Post-HSP

15 15 ATP Testing Results Pre-HSPPost-HSP

16 16 Residential Hot Water Systems (Microbiological Activity) Post-HSP Pre-HSPPost-HSP

17 17 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

18 18 Special Thanks

19 Earning your trust through reliable and efficient water management service.


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