– Development of a Tertiary Phosphorus Removal Process: Passive Filtration with Two Simultaneous Mechanisms

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The proliferation of cyanobacteria in water bodies result in a tightening of phosphorus discharge requirements in wastewater. In order to provide simple operational alternatives while performing well to achieve values as low as 0.3 mgPtot/L, development efforts need to be made. Since 2010, the Quebec Industrial Research Center (CRIQ), in collaboration with Université Laval, has been developing a passive technological approach consisting of trapping phosphorus in forest by-products specifically conditioned to act in adsorption and reductive dissolution. The technology is currently under development for real wastewaters. Among other things, an on-site piloting for 2 years for the continuous treatment of about 1 m3/day of tertiary effluent from a residual material management site (Gazon Savard Saguenay Inc.) has made it possible to evaluate the behavior of the technology under real conditions.