2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Catherine Mulligan, Concordia University
Ms. Mina Ghasri, Concordia University
Mr. Sam Bhat, Titan Environmental Containment
Abstract: Lakes are an integral part of the freshwater resources in Quebec and their protection is very important as any impairment in the lake water quality can affect the public’s health and aquatic life. Lake Caron, a shallow eutrophic lake located in the Sainte-Anne-des-Lacs municipality in Quebec, has been under swimming advisory for many years due to algal blooms every summer. In this present study, a floating filtration unit with a sand prefilter and non-woven geotextile filter media, was tested to improve the lake water quality in a small area of the lake enclosed by a turbidity curtain. The water quality was monitored during the test by deploying two YSI-EXO2 probes in and out of the curtain and analysing water samples for total phosphorus, COD, turbidity, and total suspended solids. The geotextile filters together with the sand filter were effective for removing algae and suspended particles. Overall the filtration resulted in 78% total suspended solids, 39% total phosphorus and 53 % chlorophyll a removal in the contained lake water. Use of the pre-sand filtration allowed removal of large size particles and thus reduced rapid clogging of geotextiles.
Key Words: Blue green algae, Non-woven geotextiles, Filtration, Suspended Solids, Total Phosphorus