Water Cycle 1 (2020) 98–103

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Water Cycle

journal homepage: www.keaipublishing.com/en/journals/water-cycle/

Water and in - history, current situation and future perspectives

Tony Van Rossum

Corporation of the City of London, 300 Dufferin Avenue, Post Office Box 5035, London, , N6A 4L9, Canada

ARTICLE INFO ABSTRACT

Keywords: Water reuse and recycling in Canada has been alive and viable where there is a need for water conservation or to Water reuse reduce nutrients going to rivers and lakes. A study on response to reuse shows many people are in favour, but not Regulations and guidelines for drinking or washing/bathing. This is a position when water nearby is plentiful. Reuse of water for irrigation Zero liquid discharge has occurred in Canada since the 1980’s in arid areas of the country. Guidelines have been developed across the Reuse research country. Provincial or Federal regulation is minimal except for . In this , reuse in Canada will be broken into three groups; residential, industrial and research. Sustainable development is a driver for residential and institutional sties. Industrial application is driven by lack of availability of water or costs which has led to the Zero Liquid Discharge sites in Canada, particularly in arid areas. There are companies in Canada designing and building equipment to meet the need in Canada and elsewhere. Research is also ongoing on reuse applications for treatment systems for inside sustainable homes and buildings. We are blest with abundant water in part of the country and the arid areas are leading the future for reuse in Canada.

[5]. Southern is arid and has used wastewater effluent for irrigation since the 1980’s (WWTP effluent for crop irrigation) [6]. 1. Introduction has used lagoon effluent to reduce nutrient discharges to sur- face water. Roblin and Wasagaming/Clear Lake in Riding Mountain Canada is blest with water including the Great Lakes and rivers National Park are two sites that have used wetlands and uptake by sourced by glaciers, snow and rainfall. However, Canada is a vast country Popular trees or crop irrigation [7]. "Water and Energy Conservation with arid parts. As cities expand, the demand for water increases and can Guidance Manual for Sewage Works" is published by the of stress groundwater or surface water sources. Climate change is Ontario, of which Part 4 is on Water reclamation and reuse [8]. decreasing the size of glaciers and the source of a regular supply of water The Atlantic and Environment Canada published Atlantic in the western provinces is at risk. The Canadian response to reuse was Canada Wastewater Guidelines Manual, for Collection, Treatment, and studied at Western University in 2015 [1]. The study showed that a Disposal in 2006 and part 10 provides information on planning consid- majority of the university community were in favour of use of reuse erations, re-use applications, water quality considerations, and guide- water, however they were more likely to accept reuse wastewater for lines for wastewater irrigation and other reuse criteria [9]. A report on applications that do not involve drinking or close personal contact. The golf course irrigation by the Centre for Water Resources Studies at Dal- report goes on to suggest that there are concerns about the presence of Tech, Dalhousie University was done in 1999 for the province of Prince chemicals such as pharmaceuticals. Edward Island [10]. Case studies of six golf courses throughout Canada Canadian Guidelines are produced by the federal government and were documented in the report. A Canadian standard, CAN/- provincial governments. The Federal Government published Canadian CSA-B128.1–06/B128.2–06 (R2016) specifies Design and Installation of Guidelines for Domestic reuse Water for Use in Toilet and Urinal Flushing Non-Potable Water Systems/Maintenance and Field Testing of in 2010 [2]. British Columbia has the only provincial regulation on reuse Non-Potable Water Systems [11]. It can be used for non-potable water water but there are reuse guidelines in some of the provinces. British systems for applications such as flushing toilets, irrigating lawns and Columbia has the Municipal Wastewater Regulation, 2018 and the gardens, washing automobiles, showering, bathing, washing clothes, or Guideline, 2013 [3,4]. has Guidelines for heating and cooling. In this paper, reuse in Canada will be broken into Residential Rainwater Harvesting Systems, 2010 and a fact sheet on three groups, residential/commercial/institutional/applications, Alternative Solutions Guide for Small System Water Reuse, January 2017

E-mail address: [email protected]. https://doi.org/10.1016/j.watcyc.2020.07.001 Received 23 April 2020; Received in revised form 1 July 2020; Accepted 3 July 2020 Available online 11 July 2020 2666-4453/© 2020 The Authors. Publishing Services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). T. Van Rossum Water Cycle 1 (2020) 98–103

Acronyms EDCs Endocrine Disrupting Chemicals EPCOR City of sole shareholder of the Utility Company AOP Advanced Oxidation Process FDEP Florida Department of Environmental Protection BCTMP Bleached Chemi Thermal Mechanical Pulp GRTS Groundwater Recovery and Treatment System BD3 Unit 3 of the Boundary Dam coal-fired power plant HRT hydraulic retention time BPD barrels of oil per day OLR organic loading rate CBWS Cove Bay Water System RAP Remedial Action Plan CCS Carbon Capture and Storage PPCPs Pharmaceuticals and Personal Care Products CDWQG Canadian Drinking Water Quality Guidelines RASR Remedial Action Status Report CIRS Centre for Interactive Research in Sustainability USAB Up-flow anaerobic sludge blanket reactors CMHC Canada Mortgage and Housing Corporation VCC Vancouver Convention Centre COD Chemical Oxygen Demand WSAC Wet Surface Air Cooler CWWA Canadian Water and Wastewater Association ZLD Zero liquid Discharge

industrial applications and research. Liquid Disposal (ZLD) system, treats surface water from Grafton Lake for potable water. Historically, the lake water was treated with hypochlorite 2. Residential/commercial/institutional applications addition, however this treatment is insufficient to meet the Canadian Drinking Water Quality Guidelines (CDWQG) for several parameters The " Healthy House" was a demonstration project initiated including protozoa, turbidity, manganese and colour. To comply with by a design competition by Canada Mortgage and Housing Corporation CDWQG, the reviewed several treatment technologies for (CMHC) in 1991. In the report by Ada Leung (2004), the house water ability to meet the treatment commitment and affordability of treatment. supply and reuse water system includes a cistern beneath the backyard Purifics Ceramic membrane filtration (CUF) was identified as the deck connected to a filtration system that collects rain and grey water for preferred water treatment system. A three-month pilot study was con- recycling and reuse within the house [12]. Approximately 80% of the ducted to prove the effectiveness and efficiency of the system for the water used in the home is through recycling. removal of organics and manganese in the water. Purifics has been Reuse in London Ontario includes a 3 M Office and Fanshawe College. awarded a contract to supply a drinking water purification system for The 3 M office uses cistern water from the basement sump weeping tile Bowen Island [17]. system for flushing toilets. This effort reduced building potable water The City of Guelph did a study entitled Residential Greywater Field consumption by 25% annually for the 600 employees at the site (about Test that was published in 2012 [18]. Greywater generally refers to 200 m3 per month since 2017). wastewater from household baths and showers, hand basins and kitchen The 10 year old, 14,000 square meters Fanshawe College building has sinks. The City gathered information on the costs, benefits, barriers, a green roof to lower energy consumption, storm water reuse for toilet opportunities and requirements of residential greywater reuse systems. flushing and site irrigation of the green roof. The building has two 5,000 The research team installed greywater reuse systems in 30 homes to L cisterns for storage of rainwater. Excess rainwater overflows the tanks collect greywater from showers and baths for reuse in toilet flushing. A and goes to the storm sewer. The storm water from the cistern is filtered Greywater Rebate Program was initiated that offers residential home and disinfected prior to use for flushing urinals and toilets and irrigation owners $1,000 if they install and use an approved greywater system [19]. of the green roof. The grey water is not clear and stains the toilets and The Rebate program identifies some applicable codes, regulations, urinals. Signs above the toilets have been installed advising that the by-laws and building permits, requirements of installation of approved water is from disinfected rainwater. The students in the building are in greywater reuse system technologies that must be completed by a qual- mechanical courses and on the second floor some pre-med students. The ified plumber and contractor. The contractor must also provide an op- students have accepted the use of grey water once they have learned erations manual, train homeowners on the operation of the system and about the reuse effort and the custodial staff have been provided infor- required maintenance procedures. mation of the water source and the toilets don’t need scrubbing due to the reuse water staining. They rarely run out of water and occasionally have 3. Industrial applications had float level issues in the cisterns. In British Columbia, examples of buildings with internal wastewater The City of Edmonton, Alberta, through a subsidiary, EPCOR joined reuse and non-potable reuse systems are the Vancouver Convention with Suncor on a treated wastewater reuse project and pipeline to sup- Centre (VCC) West building (Vancouver, BC); and the University of port a $2 billion expansion and upgrade to the Suncor refinery [20]. Gold British Columbia Centre for Interactive Research in Sustainability (CIRS) Bar Wastewater Treatment Plant treats wastewater from about 700,000 building (Vancouver, BC) [13,14]. The CIRS building collects rainwater people and has the capacity to treat 310 million litres of wastewater per from the roofs of the building and stores it in a cistern. Sprinkler irri- day. The membrane facility is being operated by EPCOR. Suncor built a gation can use the backup cistern water as a secondary supply of water. 460 mm, 5.5 km water pipeline between the refinery and EPCOR’s Gold The rainwater is filtered and disinfected onsite and distributed through Bar Wastewater Treatment Plant. The partnership between Suncor and the building for potable water applications. Wastewater from the build- EPCOR ensured consistent, high quality water for the refinery and a ing is treated onsite and used for toilet flushing and irrigation within the source of 15 million litres of water each day. An EPCOR/Suncor video on building [15]. The Vancouver Convention Centre (VCC) West building the Reuse Project is posted on the website (Environmentally-friendly has a black water treatment plant that reuses grey and black water for solutions: EPCOR’s water reuse project with Suncor Edmonton Refinery washrooms toilet flushing and rooftop irrigation during warmer weather 2014) [21]. The video goes into detail about: the zee weed membrane [16]. Blackwater generally refers to wastewater originating from sanitary plant at Gold Bar wastewater treatment plant and quality of permeate; sources (e.g. toilets, urinals, and bidets), as well as drainage from food the reuse at the refinery in the cooling tower and hydrogen plant; and for preparation and utensil cleaning activities (e.g. kitchen sinks and the boiler water which goes through an ultrafiltration and reverse dishwashers). osmosis system. Bowen Island Municipality’s Cove Bay Water System (CBWS), a Zero There are zero liquid disposal (ZLD) facilities in Saskatchewan

99 T. Van Rossum Water Cycle 1 (2020) 98–103 including a refinery, a plant, a power plant and a paper mill. way for full-scale carbon capture facilities around the world with their Another ZLD facility using a Canadian systems supplier is below. ZLD fully-integrated carbon capture and storage demonstration project on generally refers to no liquid leaving the plant boundary. Unit 3 of the Boundary Dam (Fig. 1) coal-fired power plant (BD3). The The Co-op Refinery Complex (CRC) in Regina, expanded its opera- integration of CCS to a coal-fired power plant not only results in the in- tions to produce 30,000 more barrels of oil per day (BPD) taking it from crease in water consumption and cooling duty, but also additional water 100,000 BPD to a 130,000-BPD facility, which increased its water usage. discharge especially from cooling the flue gas to the much lower tem- The refinery’s water source was a blend of well water and city water. perature required for the CO2 capture process. Using the dry cooler for Faced with restricted use of city water, the refinery had to find a new rejecting the higher grade heat, and the Wet Surface Air Cooler (WSAC) source of water. The plant is the first North American refinery recycling for the lower grade heat improves cooling water temperature, while also all of its wastewater. The wastewater first goes into oil water separator maintaining ZLD status [27]. open tanks where the oil is skimmed and sludge is removed from the In 1992, Millar Western opened the world’s first zero-effluent, high- bottom of the tanks. The second stage is a dissolved nitrogen gas flotation yield market pulp mill, in Meadow Lake, Saskatchewan. The first in the unit where the oil is recovered for reprocessing. The third stage has world not to discharge any effluent or water into any nearby creek, biological treatment to degrade volatile organic compounds and river, stream or lake. The logs are fed into two, ring debarkers and two, ammonia and then Zee weed membranes. The solids are treated in a disc chippers. The chips are fed into storage bins for use in the pulp mill. centrifuge and the centrate is recycled. The treated water then goes to a There are two production lines and move through stages of steaming, demineralization plant to remove dissolved solids and organics. The first storage, chemical treatment and mechanical de-structuring. Refining step is filtering through a multi-bed filter to remove solids. Then goes to changes the chips into pulp. The pulp is bleached and washed to remove ion exchange to remove cations and anions. The water goes to a forced air impurities. Hydrogen peroxide is a main bleaching chemical. The last de-carbonator to remove carbon dioxide. The next step for the water is to phase is drying, weighting, baling and packaging. All the effluent goes to go through conventional spiral wound reverse osmosis with two units in a feed chest or settling pond. The water goes through clarifier and the series. The final step is to go through a mixed bed ion exchanger for excess fibre is pressed and compressed and incinerated. The liquid passes polishing. Sixty-five per cent of the recycled water goes into steam pro- through evaporators and concentrated up to 30% solids. The liquid is duction for heating, hydrogen production and powering equipment with further concentrated via steam to about 68% and used as fuel in the re- the remaining recycled water being used in other processes such as covery boiler. The molten salt mixture from the recovery boiler is dis- cooling and hydrogen production [22]. The zero wastewater design with solved to produce green liquor. The green liquor is filtered, oxidized and equipment is described in a video [23]. The refinery uses every drop of reused as caustic in the pulping process. The company was sold to Paper water that falls on its 800-acre property which allows less usage from Excellence in 2006 and has the capacity to produce 400,000 tonnes of wells. The waste brine is disposed into a deep well. The Zee Weed Bleached Chemi Thermal Mechanical Pulp (BCTMP) annually. BCTMP membrane bioreactor (MBR) and a high efficiency reverse osmosis sys- which uses heat, mechanical action and mild chemicals to separate cel- tem used GE technology with a capacity of up to 7.6 million litres of lulose fibers is used in the production of printing and writing , wastewater a day [24]. tissue and toweling, paperboard and specialty papers [28]. The mill The EVRAZ Regina facility is a zero liquid effluent electric-arc furnace serves primarily Asian export markets. steelmaking facility. It discharges no wastewater, with the exception of a small amount of spent softener brine (which is hauled to the Regina 4. Reuse equipment sanitary sewer system). The Regina steel facility has very low water use, at less than 1,000 L per tonne (L/t) of steel produced. A study by More information on two of the companies mentioned above are as WorldSteel shows the world average for electric-arc furnace steelmaking follows: is 28,000 L/t [25]. Domestic wastewater from the site is treated and disinfected and used for cooling tower makeup. Monitoring of water Waterloo Biofilter Systems has experience in onsite treatment and usage is critical to minimize water requirements. Water softening is used reuse of wastewaters including: The Toronto Healthy House™ –which to decrease dissolved solids form cooling tower blow down and recycled was the first residential wastewater reuse system in Canada – to cooling sprays. numerous; golf courses, truck stops, and vehicle washing stations Saskatchewan is a world-leader in Carbon Capture and Storage (CCS) [29]. Waterloo Biofilter Systems have over 14 years of experience in [26]. Saskatchewan and its provincial utility, SaskPower, pioneered the

Fig. 1. Boundary dam carbon capture and storage facility [26].

100 T. Van Rossum Water Cycle 1 (2020) 98–103

delivering advanced onsite wastewater reuse installations for resi- Groundwater Recovery and Treatment System (GRTS) was completed in dential and commercial applications. summer of 2013. The Lockheed Martin ground water treatment system Purifics Water Inc. is a Canadian company that has done installations includes Purifics Ceramic Ultra Filtration and the Photo-Cat, an in Canada and the United States for water, wastewater and reuse Advanced Oxidation Process (AOP) equipment that are used in the GRTS applications [30]. Their Ceramic Membrane Process system has a (Fig. 2). Photo-Cat is a system that destroys organic contaminants using a small footprint with complexity reduction over other ceramic, titanium dioxide (TiO2) slurry-based photocatalytic process to purify or hybrid-ceramic or polymeric membrane filtration processes. The low detoxify water. The annual reports submitted to the FDEP can be found Trans Membrane Pressure (TMP, namely the hydraulic pressure dif- on the Lockheed Martin website [31,32]. ferential (net driving force) across the membrane), flux and duty The report also includes removal levels for the three trains of contribute to lower operating and structure capital costs. Photo-Cat is Advanced Oxidation Process (AOP) Equipment and Activated carbon an AOP that is chemical free and destroys organic contaminants using units separately in Table 7 of the 2016 RASR [32]. Chemicals analysed a TiO2 slurry-based photocatalytic process. Photo-Cat degrades for the process equipment operation monitoring include 1,1-dicchloro- chemical contaminants (such as 1,4-dioxane), biologicals, viruses, ethane (1,1-DCA), 1,1-dichloroethene (1,1-DCE), cis-1,2-dichloroethene oocysts, EDCs, PPCPs, removes sub-micron particulate, metals and (cis-1,2-DCE), tetrachloroethene (PCE), Trichloroethene (TCE), Vinyl can change bromate back to bromide. The De-Watering Recovery chloride (VC), 1,4-dioxane. The data on the monitored process equip- System (DeWRS) is a residuals management system to concentrate ment shows that effluent from the AOP and Carbon filters were below solids to enable a ZLD system. Purifics has Canadian sites but these criteria and for 1,4-dioxane, which did not have a criterion, the reduction sites don’t have documented data available that comes from a super was 93%. The RASR states “The GRTS was operational for 98% of the fund site. reporting period. The GRTS was able to process groundwater for 8,610.3 h, with 145.1 h of planned downtime and 28.6 h of unplanned In the United States, legislation requires public disclosure and so the downtime”. reports from one of these super fund sites is below with significant third party data and analysis. This is a groundwater treatment system which 5. Research discharges to a wastewater treatment plant and a portion of the water goes to an RO system and injected into the aquifer to maintain water Staff from the Department of Civil and Environmental Engineering, levels in the wetlands. The American Beryllium Company site in Tall- University of Alberta, Edmonton did a number of presentations at the evast, Florida was purchased by Lockheed Martin. Due to contamination Canadian Water and Wastewater Association (CWWA) Annual Confer- on the site Lockheed Martin submitted a Remedial Action Plan (RAP) to ence in Banff, Alberta in 2019 related to the future of reuse for decen- the Florida Department of Environmental Protection (FDEP). The FDEP tralized systems. Decentralized systems need to be robust with little approved the RAP Addendum in November 2010 and construction of the owner maintenance for future acceptance.

Fig. 2. Treatment system general arrangement plan [31,32].

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“Performance of anaerobic treatment of blackwater collected from References different toilet flushing systems, low flow and vacuum, could achieve both energy recovery and water conservation?” [33] The presentation [1] D. Velasquez, E.K. Yanful, Water reuse perceptions of students, faculty and staff at Western University, Canada. Published by IWA Publishing, J. Water Reuse looks at future community water services for decentralized wastewater Desalination (2015), 05.3, 2015. treatment and for onsite treatment. The onsite treat- [2] Canadian Federal Government, Canadian guidelines for domestic reclaimed water ment eliminates transport or pipelines and would fit in rural or remote for use in toilet and urinal flushing, available from: https://www.canada.ca/en/hea lth-canada/services/publications/healthy-living/canadian-guidelines-domestic-rec communities. 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