Disinfecting with UV at the Coquitlam Water Treatment Plant, Metro Vancouver, British Columbia

In the spring of 2010, Trojan was selected as the supplier of UV disinfection equipment to the Coquitlam WTP upgrade. The installation includes a total of eight TrojanUVTorrent™ reactors, equipped with TrojanUV Solo Lamp™ Technology (Figure 1). The system is sized to deliver a required UV dose of 12mJ/cm2 to 1,200 million liters of water per day, sufficient to perform a minimum 3-log reduction of Cryptosporidium and Giardia. Figure 1. TrojanUVTorrent utilizing Solo Lamp Technology. At 1,000 Watts per lamp, the Solo Lamp is the most powerful amalgam lamp in the industry. By utilizing Solo Lamp Technology, the TrojanUVTorrent provides Metro Vancouver with a best-of-both-worlds UV solution – one that combines the ease of maintenance and compact footprint associated with a medium pressure lamp system with the electrical efficiency of a low pressure high output (LPHO) lamp system. The reactor was designed to increase efficiency and operational flexibility to save power, making it the ideal solution for the vertical pipe loop, gravity-fed system at the Coquitlam WTP. TrojanUV Solo Lamp Technology combines the best features of both medium and low-pressure lamp technology. Benefits of MP Lamps • Low lamp count and small footprint • Dimmable from 100 to 30% power Benefits of LPHO Lamps • Low power consumption (1/3 the energy usage of MP lamps) • Long lamp life (>12,000 hours) • Low carbon footprint and environmental impact Metro Vancouver formally placed the concept of sustainability at the center of its operating and planning philosophy, calling it the Sustainable Region Initiative (SRI). Numerous sustainable features were incorporated into the new UV building including a green roof, EcoSmart concrete which is made using low carbon dioxide emitting methods and a hydronic heating system which uses water to heat or cool the building. In accordance with the SRI, Metro Vancouver utilized key sustainability metrics to select Trojan as the UV system supplier. Electrical energy consumption and physical footprint were heavily-weighted evaluation parameters and Trojan exceeded on both. The TrojanUVTorrent, using Solo Lamp Technology requires 70% less electricity than an alternative medium pressure lamp-based system and the Solo Lamp’s high UVC output results in fewer lamps and a small physical footprint. Further, Trojan provided a carbon footprint analysis, comparing medium pressure (MP) and Solo Lamp-based UV systems. Under typical operating parameters at the Coquitlam WTP, the TrojanUVTorrent produces one third the carbon emissions of a comparable MP solution (see Figure 2). Over a 20 year period this will result in 1,380 fewer tons of C02 being released into the atmosphere. < Co2 Emissions Graph.jpg> Figure 2. C02 estimates are based on predicted electricity consumption at the Coquitlam WTP.