Osorno has significant experience with a variety of disinfection technologies, particularly with chlorine dioxide technology that it has pioneered in Canada.
Osorno favours chlorine dioxide in many applications because of its unique disinfectant qualities:
It has a high persistence, and therefore provides protection for a long time.
It is intrinsically safe: there is no need to transport or store chlorine dioxide – it is produced on demand by a generator.
It destroys most harmful bacteria within seconds.
It does not create the harmful disinfection by-products (trihalomethanes – THM, and haloacetic acids – HAA) for which chlorine is known.
Water Disinfection at Holland, Manitoba
In 2005 Holland, Rural Municipality of Victoria, Manitoba, became the first public waterworks in Canada to use chlorine dioxide as its primary disinfectant, thus abandoning the use of hypochlorite (“chlorine”). Problems with water odours, and staining of laundry and fixtures that concerned the residents disappeared after installation of Osorno’s chlorine dioxide technology.
Osorno worked with JR Cousin Consultants. to design and install the chlorine dioxide water treatment system. Osorno provided the equipment, chemicals, analytical services and expertise for a two phase chlorine dioxide demonstration project. After successful demonstration, chlorine dioxide treatment was implemented in the Town of Holland water treatment plant (WTP) upgrade.
The demonstration project was partially funded by the National Research Council of Canada (IRAP Program) and by the Province of Manitoba (Technology Commercialization Program) as part of a R&D project for chlorine dioxide disinfection of water and wastewater.
Osorno provided biological and chemical assessment of water at the Makwa Sahgaiehcan First Nation water treatment plant (WTP) and the Island Lake First Nation WTP under contract with JR Cousin Consultants. Based on the assessment results, a multiple stage demonstration project was initiated with chlorine dioxide disinfection and filtration of well water at the Makwa Sahgaiehcan First Nation WTP, and with chlorine dioxide disinfection for the reduction of trihalomethane (THM) formation in surface water at the Island Lake First Nation WTP. Osorno provided the equipment, chemicals, analytical services and expertise for both demonstration projects.
Both demonstration projects proved how effective chlorine dioxide oxidation was in removing iron and manganese from water, and for decreasing trihalomethanes (THM) concentrations to below regulatory limits.
Osorno also participated in the review and assessment of chlorine dioxide generation methods provided by JR Cousin Consultants in this project.
Since the introduction of chlorine dioxide as a primary disinfectant in Town of Holland, RM of Victoria, in 2005, many more systems have been installed. Among them were the water treatment plants (WTPs) of the Ochiichagwe’Babigo’Ining Ojibway First Nation (formerly known as the Dalles First Nation, Ontario) and the Biinjitiwaabik Zaaging Anishinaabek First Nation (formerly known as Rocky Bay First Nation, Ontario). Both WTPs get their raw water supply from surface waters, and consequently had problems with formation of trihalomethanes (THM). When chlorine dioxide water treatment systems were installed, issues with THM disappeared, as chlorine dioxide does not form THMs.
The consulting engineer for both projects was JR Cousin Consultants. Osorno supplied chlorine dioxide generation equipment, monitoring equipment, chlorine dioxide generation chemicals, and provided installation supervision, equipment start-up and commissioning, and operator training.