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Eliminating microplastics in wastewater directly at the source – EurekAlert
A research team from the Institut national de la recherche scientifique (INRS) has developed a process for the electrolytic treatment of wastewater that degrades microplastics at the source. The results of this research have been published in the Environmental Pollution journal.
Wastewater can carry high concentrations of microplastics into the environment. These small particles of less than 5 mm can come from our clothes, usually as microfibers. Professor Patrick Drogui, who led the study, points out there are currently no established degradation methods to handle this contaminant during wastewater treatment. Some techniques already exist, but they often involve physical separation as a means of filtering pollutants. These technologies do not degrade them, which requires additional work to manage the separated particles.
Therefore, the research team decided to degrade the particles by electrolytic oxidation, a process not requiring the addition of chemicals. “Using electrodes, we generate hydroxyl radicals (* OH) to attack microplastics. This process is environmentally friendly because it breaks them down into CO2 and water molecules, which are non-toxic to the ecosystem,” explains the researcher. The electrodes used in this process are more expensive than iron or steel electrodes, which degrade over time, but can be reused for several years.
An effective treatment
Professor Drogui envisions the use of this technology at the exit of commercial laundries, a potential source of microplastics release into the environment. “When this commercial laundry water arrives at the wastewater treatment plant, it is mixed with large quantities of water, the pollutants are diluted and therefore more difficult to degrade. Conversely, by acting at the source, i.e., at the laundry, the concentration of microplastics is higher (per litre of water), thus more accessible for electrolytic degradation,” explains the specialist in electrotechnology and water treatment.
Laboratory tests conducted on water artificially contaminated with polystyrene showed a degradation efficiency of 89%. The team plans to move on to experiments on real water. “Real water contains other materials that can affect the degradation process, such as carbonates and phosphates, which can trap radicals and reduce the performance of the oxidation process,” says Professor Drogui, scientific director of the Laboratory of Environmental Electrotechnologies and Oxidative Processes (LEEPO).
If the technology demonstrates its effectiveness on real commercial laundry water, the research group intends to conduct a study to determine the cost of treatment and the adaptation of the technology to treat larger quantities of wastewater. Within a few years, the technology could be implemented in laundry facilities.
About the study
The article “Treatment of microplastics in water by anodic oxidation: A case study for polystyrene”, by Marthe Kiendrebeogo, Mahmoodreza Karimiestahbanati, Ali Khosravanipour Mostafazadeh, Patrick Drogui and Rajeshwar Dayal Tyagi, was published in the Environmental Pollution journal. The team received financial support from the Fonds de recherche du Québec – Nature et technologies (FRQNT), the CREATE-TEDGIEER program, the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Francophonie Scholarship Program (CFSP).
INRS is a university dedicated exclusively to graduate level research and training. Since its creation in 1969, INRS has played an active role in Quebec’s economic, social, and cultural development and is ranked first for research intensity in Quebec and in Canada. INRS is made up of four interdisciplinary research and training centres in Quebec City, Montreal, Laval, and Varennes, with expertise in strategic sectors: Eau Terre Environnement, Énergie Matériaux Télécommunications, Urbanisation Culture Société, and Armand-Frappier Santé Biotechnologie. The INRS community includes more than 1,400 students, postdoctoral fellows, faculty members, and staff.
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Why can some people 'hear' the voices of the dead? Scientists have an answer – Yahoo Canada Sports
The waiting is over in the wild rose province. Curling Alberta has made its decision on what teams will represent the province at this year’s Scotties and Brier in the Calgary bubble. Laura Walker, last year’s provincial champion, has accepted the invitation to play at this year’s Scotties. “We were excited to get the call. We wanted to wear the blue and gold and we take so much pride in representing our province,” Walker told CBC Sports. “We know there are many deserving teams in Alberta and we don’t take this honour lightly.” Walker made her Scotties debut in Moose Jaw, Sask., last year and finished with a 3-4 record. On the men’s side, Brendan Bottcher will once again be going to the Brier. Bottcher is last year’s provincial champion. He has played in the last three Brier championship games, losing twice to Brad Gushue, and two years ago to fellow Albertan Kevin Koe. It’s Bottcher’s fifth appearance at the Brier. The decision was made Sunday afternoon by the Curling Alberta board members. Massive repercussions This was a much anticipated decision as it will have massive repercussions on what other teams will attend the national championships. Curling Canada has announced a one-time expanded field for the Scotties and Brier, citing these extraordinary times in the midst of a pandemic as the reason for increasing the field to 18 teams. Normally, there are 16 teams competing at the event. However, Curling Canada has said there will be no wild-card game as it’s unfair to have teams travel all that way and make plans to only play one game. The governing body for the sport wants the best teams in the country at the event. So the first two spots will be determined by the CRTS rankings — the two teams that would normally compete in the wild-card game. The third and final team will be determined through a number of criteria. Kevin Koe, who brought in John Morris to join the team in place of Colton Flasch during the off-season, is ranked sixth. He’ll be at the event. “While we don’t agree with the decision made we are excited to have the opportunity to compete in the Calgary bubble,” Koe told CBC Sports. “Regardless of the uniform we are wearing we are a very motivated team and excited to compete for another Canadian championship and represent all our sponsors and fans.” Mike McEwen’s Manitoba rink is ranked fifth and is also a lock for the event. The last spot would then most likely go to Glenn Howard out of Ontario, as his team is currently ranked ninth. WATCH | Heroux, Jones break down Calgary culring bubble: Women’s side more complicated The women’s side is a tad more complicated. With Walker being named as Alberta representative, that means Tracy Fleury’s Manitoba rink is locked in for one of the spots with her No. 2 ranking. The next team without a Scotties spot is Chelea Carey. Her team disbanded during the off-season — Carey is a free agent. Then it’s Kelsey Rocque’s Alberta rink at No. 5. The issue for Rocque is that she changed two of four players during the off-season — and Curling Canada rules explicitly state three of four members need to return to be eligible. That eliminates the Rocque rink from the two CRTS spots — however, the team might be considered for the third spot. There is a potential situation brewing that could include last year’s world junior champion Mackenzie Zacharias. Her Manitoba rink is ranked 11th. This all comes in the wake of a number of jurisdictions cancelling their playdowns. To date, eight jurisdictions across Canada have now cancelled their playdowns — they include: B.C., Alberta, Saskatchewan, Manitoba, Ontario, Northern Ontario, Quebec and Nova Scotia. The final spots are expected to be filled over the next couple of weeks. Women Canada — Kerri Einarson. B.C. — Corryn Brown. Alberta — Laura Walker Saskatchewan — Sherry Anderson. Manitoba — Jennifer Jones. Ontario — Rachel Homan. Northern Ontario — Krysta Burns. Quebec — Laurie St-Georges. Nova Scotia — Jill Brothers. Nunavut — Lori Eddy. Men Canada — Brad Gushue. B.C. — Steve Laycock. Alberta — Brendan Bottcher Saskatchewan — Matt Dunstone. Manitoba — Jason Gunnlaugson. Ontario — John Epping. Northern Ontario — Brad Jacobs. Quebec — Michael Fournier. Yukon — Dustin Mikkelsen. Nunavut — Peter Mackey. There are six major curling events planned for the Calgary curling bubble starting with the Scotties on Feb. 19. That will then lead into the men’s national championship beginning of March. 5. Following these two events, the mixed doubles championship will take place all leading to the men’s world curling championship, set to begin in early April. The final two events held inside the bubble include two Grand Slam of Curling bonspiels.
VIDEO: Why Nova Scotia health officials are testing for COVID-19 in a community that's largely been spared from the virus – TheChronicleHerald.ca
Over the weekend of Jan. 16-17, people in the Bridgewater, N.S. area were offered rapid COVID-19 testing for the first time since the province introduced the process last fall.
In the video above, Dr. John Ross speaks to SaltWire’s Sheldon MacLeod about why Nova Scotia health officials are looking for the virus in a community that has been mostly free of infections, even during the height of the outbreaks in the province.
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