Coping with chlorine in Calgary
The Canadian city of Calgary, with a population of one million, is in better shape than most communities when it comes to drinking water supply. Its source is the abundant Bow River, fed by pristine glaciers in the Rocky Mountains. However, spring melt causes suspended solids and organic loads to fluctuate widely, and ranching activities and abundant wildlife can contribute faecal material and giardia (known locally as ‘beaver fever’) to the supply.
As a result, the city operates two water treatment plants with a total capacity of 900,000m3/d; chlorine gas is the primary disinfectant treatment at both plants. “Chlorine is one of the most cost-efficient means of disinfecting,” says John Jagorinec, senior water quality analyst for the City of Calgary’s water services.
- See more at:
http://www.globalwaterintel.com/arch....VyRd6SmE.dpuf
Water treatment tour - Clarified water basin
Clean water is sent to the Clarified Water Basin, where sodium hypochlorite (chlorine) has enough time to disinfect the drinking water, killing micro-organisms and viruses that can cause disease.
http://www.calgary.ca/UEP/Water/Page...ter-Basin.aspx