The Bog is where thoughts, opinions, discussion pieces, and action converge. Influential thinkers from the water community are invited to share their insights on current or controversial water topics. Please note that the views expressed herein are those of the authors, and do not necessarily reflect the position of the Alberta WaterPortal.
How urban resiliency is a triple bottom line winner for Alberta
By Laura Corbeil, Steve Herman and Alexander J.B. Zehnder
All over the world, people are asking questions about climate change. When will it affect us, how will it change our everyday activities, and what can we do about it? How do we prepare for the economic, social and environmental (triple bottom line) risks and opportunities?
These questions have complex responses that vary between communities and continents, but with the conversation started people are already creating answers for Alberta.
The reality is climate change is already underway; in Alberta, we have witnessed increasingly warmer temperatures, a trend that is predicted to continue and even intensify. It is expected climate change will produce more heat waves, floods and droughts as well as earlier snowmelt and the disappearance of glaciers.
Figure 1: The hydrologic cycle. Temperature driven transpiration, evaporation and melting will increase with higher ambient temperatures, influencing the entire cycle. Source: Environment and Climate Change Canada
It is no coincidence all of these impacts are connected to water, as climate change has pronounced effects on global, regional, and local water systems. These systems directly influence our way of life because they control water flow, availability, and quality.
Water is critical to our lives. We drink it, use it to grow our food, play in it and so much more. We are also impacted by water’s natural cycle (Figure 1) for instance the timing of precipitation and impacts on crops. Higher temperatures are predicted to impact the hydrologic cycle in many other ways, including:
- Water quality,
- Climate variability,
- Extreme weather condition frequency and/or severity, and
- Earlier snowpack melt.
All these impacts increase risks relating to water quality, quantity, and reliability; a direct result of the interconnectedness of the hydrological cycle. As we become more familiar with the possible impacts of changes to the hydrologic cycle, the question becomes: are we ready for them as best we can be?
Wastewater as a resource: it’s practically gold
By Brie Nelson
This World Water Day, let’s admit the term ‘wastewater’ is a bit of a misnomer for at least two reasons: first, wastewater can contain real gold and second, it plays a valuable role in our lives.
When it comes to municipal wastewater, in addition to the natural amounts of metals found in water, metals come from a variety of sources including clothing with odor-deterrent metal microfibers, cosmetics and pharmaceuticals. Industrial processes also use water for operations including manufacturing, extraction and cooling, which, among other activities, can result in the transportation of metal particles in wastewater.
It is fascinating to note that a wastewater treatment plant in Nagano Japan has adapted processing to extract gold from waste sludge. The plant recovers over 1 kg (2.2 lbs) of gold from 1 metric ton of ash produced by incinerating dried sludge. The region this treatment plant serves has a particularly high mineral content in the water and hosts a large number of metal manufacturing facilities and mines, including a gold mine, which results in the particularly rich wastewater.
Green Infrastructure: Why implement it in Alberta?
By Denise Di Santo
Traditionally, stormwater has been regarded as a wastewater product – conveyed off land to receiving waters through grey infrastructure via pipes, pumps and ponds. The approach is not serving us well, nor is this sustainable for ecosystems that rely on healthy, integrative systems to exist. This is because in the context of the built urban system, we are creating evermore-impervious surfaces that serve to further degrade water quality and watershed function.
Stormwater management is evolving as a more holistic undertaking, where stormwater is being treated, literally, as a vital component of water resources and our natural resource base.
Low Impact Development (LID) is an innovative stormwater management approach that follows a basic principle modeled after nature: manage rainfall and snowmelt where it meets with land, allowing it to be intercepted, infiltrated, and treated before it is introduced to receiving waters. These processes also provide flow control, and work to balance water quantity as water cycles through the system. The idea is to mimic natural processes and maintain or restore hydrologic function through the use of retained landscape features, and integrating green infrastructure, which includes raingardens, green roofs, permeable pavement, and biofiltration facilities. These are regarded as LID best management practices and are sometimes referred to as green stormwater infrastructure (GSI).
Working in tandem with grey infrastructure, green infrastructure decentralizes and supplements the treatment train, resulting in improved stormwater quality and reduced runoff throughout the drainage area. These enhancements in the stormwater management system are key to creating resilience at the site, catchment and watershed scales.
Although considered innovative, LID is not a new concept. As an example, I encourage you to explore Ian McHarg’s book, Design with Nature, first published in 1969. To conceptualize human impositions on natural environments and the need to reverse our impacts, McHarg, who had a central role in the development of environmental planning, is quoted: “Let us green the earth, restore the earth, heal the earth....”
In a sense, LID is part of the landscape architect paradigm integrating natural features and function with built form.
Vegetated strips in parking area for interception, infiltration and treatment (note cuts for inflow). Image: University of Nevada Cooperative Extension
Throughout North America, the shift back to nature-based solutions is becoming more commonplace. Although regulatory requirements associate the use of green infrastructure with water quality improvement and flow control, a long list of benefits are also realized.
These benefits are identified through life cycle benefit-cost analyses and include:
- improved air quality and reduced ambient temperatures
- landscape aesthetics and increased property values
- reduced stream erosion in receiving waters
- aquatic ecosystem health for fish and other species
- mental well-being and physical health, and
- providing critical terrestrial habitat.
In addition, natural and green infrastructure accrue value over time, whereas built grey infrastructure depreciates in value and requires costly lifecycle operations and maintenance and, ultimately, decommissioning.
Philadelphia, Chicago, Seattle, Vancouver and Toronto are among the leaders in establishing green infrastructure programs. In many cases, cost effectiveness and efficiency has been greater than anticipated. Programs and public-private partnerships exist to fund stormwater infrastructure retrofits, including integration of green infrastructure in the built environment, new and redeveloping. The positive return on investment has been well documented for more than a decade and it is time to take note. That said, implementation of stormwater best management practices continues to provide lessons for improvement.
|My favorite “Swale on Yale” project in Seattle aka “Capital Hill Water Quality Improvement Project” (pictured Fall 2014).
Image: KPG Interdisciplinary Design
In Alberta, and in some North American cities, innovation in stormwater management practices is largely being approached with caution by policymakers. The Alberta Low Impact Development Partnership (ALIDP), a non-profit organization, has been at the forefront of the needed engagement and training of multi-disciplinary stormwater practitioners.
A shift in thinking is required to ensure the adoption of green infrastructure and supportive policy; traditional engineer and land planning disciplines tend to look for predictable, quantifiable outcomes with cookie cutter approaches in the process of developing the land base. These certainties don’t come easy with designs that yield results not immediately assessed with numbers.
Green infrastructure technologies also need to be adapted to local conditions and soils. Local research has been limited but efforts are underway to identify the best suited technologies for Alberta. As one innovative stormwater practitioner in Seattle puts it: the approach is of: “right site, right team, right design.” The choice of LID best management practices must be suited to sites, using multidisciplinary teams, including water resource planners, landscape architects, urban designers, and engineers. To add to the challenge of thinking outside the box, water resources management requires a precautionary approach—stepping into the future of risk management, particularly in the context of climate adaptation, is no longer optional.
|Rain garden - by Rogersoh (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)] via Wikimedia Commons|
Stormwater management innovation cannot come soon enough for places like Alberta. Uncertainties and constraints of limited water supply, and associated risks with flood and drought, are now a universal driver for building adaptation capacity and watershed resilience. Consider life cycle return on investment and trade-offs of our actions.
Water reuse has become part of this equation, to ensure water quality is matched to use while at the same time, providing a form of source control at the site scale. We can no longer afford to contaminate and convey stormwater, a critical component of water supply, to ground and surface waters. Cities and counties would do well to designate and protect natural infrastructure such as wetlands that provide ecosystem services to benefit ecosystems, rather than adopting policies and practices that for the most part, remove these assets from the landscape.
It is time to also invest in stormwater best practices research, learn from other places, and monitor and adaptively manage green infrastructure, as has been done with any innovation ever adopted successfully.
Denise is a watershed planner with a passion for connecting water and people through collaboration and inclusive planning for nature-based solutions. With broad water resources management experience, Denise takes a systems approach to innovative stormwater management, ecosystem protection and recovery, and creating conditions for resilient communities.
Links from Denise for further reading on green infrastructure include:
Return on Investment - US EPA
Return on Investment - North Carolina State University
Return on Investment - ECO Northwest
How bacteria cultured in Alberta are helping treat algae and wastewater
By Joshua Day Chief
We’ve all seen it—excessive nutrient loading making lakes and ponds look and smell horrible. But, did you know these bodies of water typically have low dissolved oxygen, excessive algae blooms, unpleasant odours, plant growth, and stressful conditions for fish and wildlife?
Lakes and ponds stressed by unnatural water cycling, nutrient spikes (e.g. nitrogen and phosphorus), and altered shoreline and riparian habitat have a reduced capacity to decompose organic matter, cycle nutrients or maintain the water quality required for a healthy aquatic ecosystem.
However, we have a natural friend to help fight the algae foe!
Biotechnology products using a super-concentrated source of bacteria, which are naturally occurring in healthy aquatic systems and functions, effectively cycle and sequester nutrients in aquatic ecosystems. Further, by boosting populations of naturally occurring bacteria, the cycling of nutrients and organic decomposition can return, which can be critical to buy time for operators and others to pursue remediation of the root causes of stress on the impacted aquatic system.
When water comes from a surface runoff supply, it also brings high chemical and nutrient content. This is the perfect environment for algae to grow.
With more attention on environmental water treatment options the effectiveness of bacteria presents a naturally occurring alternative that can also be cost efficient.
Evergreen, Calgary, June 2014 (before)
|Evergreen, Calgary, August 2014 (after)|
What many people may not know is that specific consortiums of bacteria are used around the world to help treat wastewater as well. They address challenges including:
- Enhanced nitrification (see Figure 1)
- Biological oxygen demand (BOD) improvement - by taking care of this you make sure natural levels of oxygen in rivers or ocean / discharge outlets are preserved
- Odours (H2S)
- Sludge reduction - through using the right bacteria you can reduce biosolids, which are the organic matter recycled from sewage.
Figure 1: the nitrogen cycle
Later in the treatment process, bacteria make enzymes, which digest sludge; however, enzymes are made primarily when the bacteria are starved. The bottom of a sewage lagoon is not an ideal environment for bacteria to make sludge-digesting enzymes.
In a lagoon where bacteria are not producing enzymes quickly enough, the sludge will build up. This is why bacteria that are safe, naturally occurring, and not genetically altered are ideal for sludge and grease digestion. It is also possible to produce huge quantities of nitrifying and sludge digesting bacteria.
Bacteria have a significant role to play in water treatment. In Raymond, Alberta, Advanced Water Technologies cultures super concentrated bacteria, which are used in a simple treatment plan and applied to optimize both anaerobic and aerobic processes to address effluent qualities.
It’s impressive how these little bugs can reduce capital expenditure by possibly avoiding plant expansion or upgrades, and contributes to the efficiency of wastewater treatment plants by up to 40%. Combined with their work on algae, you have a formidable ally in addressing some of our most prevalent water treatment challenges.
Click here to watch a new video stepping you through the Advanced Water Technologies process.
Joshua Day Chief is the President at Advanced Water Technologies (AWT), an Alberta-based, family operated, biotechnology company developing and producing bacterial formulations that enhance the recycling process of nutrients and waste for application in lakes/ponds, agriculture, aquaculture, wastewater treatment and environmental remediation.
From Latrine to Otohime: A blog worth reading on the toilet!
By Hana Mason
This Saturday November 19th is World Toilet Day. A day dedicated to education and waste management, initiated by the World Toilet Organization, World Toilet Day seeks a world in which everyone has access to clean, safe waste management and disposal systems .
Sometimes the forgotten sibling of water treatment, wastewater disposal and management has been an issue for humankind throughout history. So let’s take a trip back in time to see where we’ve come from and where we’re going with this critical piece of water management infrastructure!
In Ancient Egypt, in-home latrines filled with sand (much like a human litter-box) provided a private area for Egyptians to do their business. The Indus Valley civilization of c.2600-1900BC had an advanced network of sewers. The Romans used sewer systems to collect rainwater and sewage, and even had a sewer goddess, Cloacina .
The Roman sewer goddess Cloacina (no image copyright information available)
During the middle ages in Europe, hole-in-the-ground latrines made way for monasteries with complicated stone and wood lavatories over rivers and oceans, letting waste fall straight into the water. Furthermore, during the castle-building boom, chamber pots and latrines turned to garderobes - vertical shafts in castles which emptied into cesspools and moats. Garderobes were some of the first waste-disposal methods integrated into architecture in Europe.
Throughout this time, though particularly in the Middle Ages, poor waste disposal methods led to widespread illness such as the plague, typhus and cholera. Problems similar to this, mostly regarding waste contaminating drinking water, still affect a third of the world's population .
Stepped garderobe shafts at Langley Castle, by Viollet-le-Duc
The move towards modern-day toilets began in the 1500s. Sir John Harrington invented the flushing lavatory and cistern in 1596. Up until then, the use of chamber pots, cesspits and earth closets were popular. In fact, they continued to be popular until 1775, when Alexander Cumming received a patent for the flush toilet, and 1778, when Joseph Brahman created a better design.
"Thomas Crapper" is often cited as the inventor of the flush toilet, but that has be proven a myth.
It's easy to say, of course, that we are much better off in the way of toilets today, but we are missing out on one thing – many chamber pots and porcelain toilet bowls in the early days were lavishly decorated. The fuzzy toilet-seat covers of the 1970s and beyond don't really measure up to the artful works of the 1500-1700s .
That's not to say toilets and waste management haven't inspired art. Artist Wim Delvoye has created a series of pieces titled Cloaca. The complicated and artfully designed machines have one unique, seemingly useless purpose – create excrement. Replicating the human digestive system, the machines take in food and pump out waste. 100% real waste, created artificially. The meaning and reason behind these creations are not always clear, but could certainly be a talking point for your Toilet Day conversations! 
Modern toilets range from your every-day bowls, to dual-flush, energy efficient toilets, and advanced Japanese "smart toilets".
In Japan and other areas in Asia, squat toilets—essentially horizontal urinals—have been popular for most of history. Historically the same as European latrines but lacking seats, modern-day squat toilets have similar internal plumbing set-ups to western flush toilets. However, western-style toilets have gained some popularity, particularly in areas with heavy western influence.
High-tech "smart toilets", which are called Washlets by Japanese locals, include such features as heated seats, bidet functions, and blow dryers. Tourists may be intimidated, but locals love them so much, they even include them in their homes.
Smart toilet with seat-side and wall-mounted control panels (bestofremodeling.com)
One considerable innovation in Japanese toilet-tech is the Otohime, which plays flushing noises while the toilets are in use. This seemingly bizarre item became necessary when the popular habit of continually flushing to gain privacy began to waste too much water. In Japan, use of the Otohime and similar music-playing toilet devices has helped save an estimated 20L of water each use .
In modern-day Europe, you'll find coin-operated toilet booths in the street and public toilets requiring a fee to use.
Here in Alberta, self-cleaning public toilets rooms pepper our downtown landscapes, for instance you can find some along the river in downtown Calgary, near the Simmons building.
A pay-per-use public toilet in London, England
("2010-10-15-09-33-35" by "zmtomako" is licensed under CC by 2.0)
Some more modern innovations in waste management are on their way to helping create healthy, clean and safe waste disposal globally. Mobile Toilets are cheap, portable toilets, often biodegradable bags which can be sealed. Composting Toilets and outhouses create fertilizer from human waste, providing a key ingredient for agriculture. Used not just in the developing world composting toilets are feasible options for everyone. Bio-energy Toilets turn sewage into clean water, electrical power and fertilizer. Solar Toilets are solar powered and break down waste for re-use as energy .
To encourage water conservation Alberta has used toilet rebate programs. Up until August 2016, the City of Calgary offered a rebate program for switching to dual-flush toilets, and municipalities such as Airdrie and Athabasca continue to do so. It’s worth checking out if your local municipality offers rebates on dual-flush toilets .
Toilet designs past, present and future aside; World Toilet Day helps us appreciate the role of sanitation and wastewater management around the world. Not a bad thing considering, on average, we spend three years of our life on a toilet...
Hana was a summer student with the Alberta WaterPortal Society in 2016. In her spare time she enjoys reading, writing, and spending time with friends. She is currently in Victoria, B.C, studying Writing at the University of Victoria.