Net Zero Water worked with both the developer and engineer on the Islington Terrace project in Toronto. Designing a highly efficient low-impact development (LID) solution, Net Zero Water’s packaged system with full automation specifically addressed the rainwater harvesting and cooling tower need.
Solution
Net Zero Water’s client was required to provide a water balance plan for their site. The solution was to retain stormwater runoff and use it through infiltration, evapotranspiration and/or rainwater reuse. This property features several green roofs due to their ability to absorb rainwater and release it slowly over a period of several hours. Water released by green roof systems can reduce site runoff by 50% or more. The runoff from the green roof and other roof surfaces is then harvested for reuse.
Water quality collected as green roofs can impart constituents such as phosphorus, tannins and possibly excessive microorganisms. Net Zero Water designed a system which efficiently treats rainwater runoff using no liquid chemicals or large volumes of potable water for back-washable filters. Treatment included ozone for full oxidation of organics followed by a bag filter to catch all dissolved particles and UV disinfection in order to remove all microbial contamination.