16th Canadian National Conference on Drinking Water – Intelligence Bulletin #4

Bulletin # 4 Wednesday October 29

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Tuesday was ‘SanEcoTec’ day at the Conference with a lunchtime presentation from Jim Shubat, SanEcoTec Founder and Chief Technology Officer; SanEcoTec’s Jay Whiteside and his presentation of AVIVE™ and the Future of Water; and Dr. Gordon Balch of Fleming College presenting AVIVE™’s use of HSP as a secondary disinfection agent for the reduction of potentially harmful DBPs.

Bridging the Gap in Smaller Communities

– presented by Jim Shubat

The Killaloe Pilot for AVIVE™ was successful and reduced THMs, reduced operating costs, and HSP remained stable in distribution and reduced biofilm, and even maintained a residual in hot water tanks – the detail to be presented later in the day.

There is work that is sometimes overlooked, and that’s the work in developing a good relationship of trust in these smaller communities. The key is Bridging the Gap between the problem and the solution; between the need and the innovation.

It requires a thorough due diligence…customization to meet the unique requirements of the community…and many trips to their home turf, to answer questions.

We think patience is key…you can’t hurry love – and you need to develop a close feel for the sentiment of the community. When SanEcoTec has worked with small towns we’ve had Town Halls and Focus Groups in addition to Council meetings, committee meetings and meetings with the operators and staff.

Never underestimate the importance of meeting with those who make the Treatment Plant work. Your investment in that relationship will pay dividends.

There has to be product innovation that you’re bringing to solve the problem. It’s critical to bridge the gap with relationships with the decision makers, the treatment plant operators and the end user, the rate-payer. They all count and they are each central to our approach which has Public Accountability at its core.

AVIVE™. Healthy Water. Better Life. And the Future of Water

– presented by Jay Whiteside.

This presentation will be available on video at a later date.

The presentation was intended to “speak to your imagination, not your indignation” and provided an insight into:

  • The role of water treatment professionals as leaders
  • The Duty of Candor shared by leaders to disclose avoidable harm that may come from current drinking water treatments
  • The direct medical costs of chlorination and future risk associated with current drinking water treatments
  • The Intelligence of Nature results of AVIVE™ applications where the performance and ROI of AVIVE™-treated water improved overall outcomes
  • The role of public trust in meeting the extraordinary financing requirements of future infrastructure improvements, and
  • Value Capture strategies that can be used with the improvements that accrue from AVIVE™

The Use of AVIVE™’s Huwa-San® Peroxide as a Secondary Disinfection Agent for the Reduction in the Production of Trihalomethanes in Polished Drinking Waters

– presented by Dr. Gordon Balch

This presentation will be available in full at a later date.

IB_4_outcomes_imageA case study was done with the goal of mitigating concentrations of disinfection by-products (DBPs) such as trihalomethanes (THMs) in the drinking water of Killaloe, Ontario. The Killaloe drinking water system is small with only 90+ connections, uses a groundwater well under the direct influence of surface water, and characterized by long residence times of water in the system. High THM concentrations above compliance necessitated flushing and wastage of significant volumes of treated water. It was found that Huwa-San Peroxide (HSP) in secondary treatment reduced concentrations of chlorinated DBPs with no negative impacts on water quality. HSP disinfection potential was similar to that of chlorine and was shown to be capable of maintaining a residual under conditions analogous to those of Hot Water Tanks.

Addressing Water Discolouration in Water Systems Operational Optimization and Engineering Techniques

– presented by Asim Masaud, Ontario Clean Water Agency.

The presentation focused on the issue of manganese (Mn) in shallow, surface water sources. A typical lake is stratified with respect to water density, temperature, and dissolved oxygen (DO) levels in the summer and winter with mixing of the layers happening in spring and fall. MnO2 is of concern for potable water – it is an insoluble, black deposit. It is correlated with DO and influenced by pH:

  • pH < 5: Mn is soluble
  • 5 < pH < 8: Mn is soluble under reducing conditions, insoluble under oxidizing conditions
  • pH > 8: Mn is insoluble

A case study of a high Mn levels in a surface water source in 2012 in Callander, Ontario:

OCWA investigated and suggested a methodical approach to Mn mitigation with the goal of avoiding costs of any large infrastructure changes. The intake pipe was raised from the lake bed, the flocculation step was moved to the front of the treatment system for better coagulation, and soda ash was used to adjust alkalinity upwards from 20 mg/l. Tips: keep free chlorine between 0.5 and 1.0 mg/l after filtration, pH > 7.0 before the filter, and replace media on a regular schedule but retain the top several inches of media.

QMRA: Modeling Microbial Risk for Source Waters with Low Pathogen Prevalence

– presented by Joshua Elliott, University of Toronto

A series of different biofilter setups was studied to see which was most effective at removing spores, which were used as an analog for cryptosporidium. Biofilters augmented with H2O2 and nitrogen and phosphorus were studied and compared to conventional biofiltration including filtration and flocculation process steps. Conventional filtration with biolfiltration was most effective with a 4.5 to 5.4 log removal. Direct filtration yielded a 3.4 log reduction. Biofiltration had a 0.7 log reduction. The conclusion was that biofiltration alone is probably inadequate to achieve desired log removal of cryptosporidium. The overarching goal is achieving a Disability-Adjusted Life Year (DALY) of 10-6, i.e. one-in-a-million chance of becoming ill.

Vacuum UV Based Advanced Oxidation for Small Drinking Water System – Important Process Parameters

– presented by Madjid Mohseni, University of British Columbia

Vacuum UV (VUV) has advantages such as allowing the passage of light of the 185 nm wavelength (about 10% of the total light). The lamp splits H2O to generate hydroxyl radicals, which are non-selective in treatment and can treat a wide range of pathogens and pollutants. The system is relatively simple to operate, produces no downstream chemicals, and disinfection and degradation happen simultaneously. In experiments, VUV was very effective at treating atrazine (close to 100% removal). It was also able to treat 1,4-dioxane. It was more effective than UV alone and UV with H2O2. A disadvantage is that high alkalinity and ions such as chloride in the water can reduce its effectiveness by absorbing some of the light power and scavenging the hydroxyl radicals.

Approach for Determining Minimum Treatment Requirements for Well-Based Municipal Systems: an Update of the MOE’s GUDI Terms of Reference

– presented by Aziz Ahmed, Ontario Ministry of the Environment and Monica B. Emelko, University of Waterloo

The 2001 GUDI Terms of Reference are out of date in various aspects. For example, there is no easy distinction between groundwater and surface water in the water cycle. Water treatment should be and is based on its quality rather than its source is called. A current challenge is the issue of pathogens such as cryptosporidium and giardia whose transport and survival are not easily predicted and for which there are no suitable quantitative surrogates to facilitate their study. As such, the new Terms of Reference include 3 categories of water (GW, GUDI, and SW/GUDI) to which are applied four levels of treatment depending on the raw water quality and precautionary principles. The process of the revision is collaborative, multi-stakeholder, and includes academics, consultants, and municipal system owners and operators who undertook different studies and other work in support of the revision

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Today’s Sessions include Dr. Steven Liss of Queen’s University reporting on the application of AVIVE™’s HSP in secondary disinfection of potable water and mechanism of action for enhanced antibacterial activity.

Look for reports on that and more in tomorrow’s Intelligence Bulletin.

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