Wetlands are providing a wastewater treatment benefit in cold climates. Sampling protocols and predictive tools exist. Wetlands could be part of a hybridized wastewater treatment strategy in northern Canada.
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Assessing the performance of cold climate natural wetlands in the treatment of domestic wastewater effluents in northern Canada
1. Assessing the performance of cold climate natural
wetlands in the treatment of domestic wastewater
effluents in northern Canada
Gordon Balch‡, Brent Wootton‡, Colin Yates†, Sven Jørgensen¥ and Annie
Chouinard§
‡Centre for Alternative Wastewater Treatment, Fleming College, Lindsay †Faculty of Environment, University of Waterloo, Waterloo
¥ Water Research Laboratories, ASP, Væløse, Denmark § Civil Engineering Queen’s University, Kingston
2. Focus
• Wetlands are providing a treatment
benefit
• Assessment tools are available
• Wetlands could be part of a
hybridized wastewater treatment
strategy
2
3. Background
• CCME guidelines
• Present and future
challenges for lagoon
systems
• Tundra wetlands exist
downstream of lagoons
3
Pond Inlet – sewage
lagoon
Paulatuk– sewage lagoon
4. Question: do wetlands provide
treatment?
• Anecdotal evidence
• Answer hampered by
– Lack of knowledge
– Lack of standardized
testing
– Inability to predict
response to changing 4
Ulukhaktu
k
5. Wetland Surveys
i. Arctic Summer (inlet, outlet)
– Seasonal trend
– No pretreatment or pretreatment (facultative
lakes or lagoons)
– Lagoon decants / exfiltration
– Performance (BOD5, TAN, TSS, microbial,
etc.)
– Calibration of SubWet 2.0 rate coefficients for
Northern conditions
15. Concluding Remarks
• Wetlands do provide treatment benefit
• Sampling protocols and predictive tools
exist
• Consideration of a hybridized approach
should be considered
15
16. Concluding Remarks
• Demand for decentralized treatment likely to
increase
• Demand for specialized treatment to off-load
burden to centralized systems may increase
• May see greater need for advanced
treatment systems for Nitrate and
Phosphorous in relationship to source water
protection
16
Acknowledgements