Articles

Les conférences et expositions de la WEFTEC figurent, depuis cinq ans, au sommet du palmarès des colloques sur le traitement des eaux usées aux États-Unis...
Source Magazine, Vol.4, No1, Hiver 2008.PDF

La Ville de Québec fête cette année son 400e anniversaire. Doit-on se surprendre si certaines de ses infrastructures, dont son réseau d'aqueduc, nécessitent une remise à niveau ? S'étendant sur plus de 2 450 km, celui-ci dessert plus de 500 000 personnes, soit 98 % de la population de l'agglomération de Québec.
Ciment en ligne, Avril 2008.PDF

BAFs (Biologically Aerated Filters) are compact treatment processes, which combine filtration and aerobic/anoxic/anaerobic treatment using a fixed-film biodegradation. They consist of an immersed biological filter operating either in down flow or upflow hydraulic condition. They are used to remove TSS, COD, BOD₅, NH₄-N and NO₃-N, either as a secondary or tertiary stage. Their filtering properties can also be used to remove phosphorus. The filter medium is periodically backwashed to remove suspended solids retained during the filtering interval and excess biomass produced within the filter bed. Their development has spanned the last 20 years. This paper presents the very last innovation in the application of BAFs for carbonaceous pollution abatement.
Environmental Sciences & Engineering_January 2008.PDF

Aerated lagoons use mechanical aeration to provide dissolved oxygen for biological treatment of wastewater. These systems efficiently remove carbonaceous pollution (whether measured as BOD or COD) from the effluent but nitrification is not readily accomplished giving poor ammonium removal.This situation is even more critical in cold, Canadian winter conditions, where nitrification is almost non-existent at temperature near the freezing point (<5^oC).
Canadian Water Treatment_March, April 2008.PDF

Increasingly stringent environmental regulations pertaining to discharges containing total suspended solids (TSS) and heavy metals (Zn, As, Cu, Ni, etc.,) are being imposed on effluents from the mining industry. Coupled with often-limited available site area to install process equipment, the development of technically and economically feasible processes for removal of these contaminants from industrial wastewater prior to discharge becomes a necessity.
Environmental Sciences & Engineering_May 2008.PDF

Water disinfection is the most critical process in the treatment of water and wastewater. The world's most universal and reliable means of water and wastewater disinfection is chlorination. Two fundamental methods include gas chlorination (Cl2) and liquid chlorination (NaOCl), otherwise known as sodium hypochlorite. Chlorination was introduced as a commercial water purifier in 1908 and has since been acknowledged as the optimum method for water disinfection due to its ability to provide residual protection throughout the water distribution system.
Environmental Sciences & Engineering_July 2008.PDF

Aerated lagoons are used extensively throughout Canada for treatment of municipal wastewater. In fact, by far, lagoons are the most popular wastewater treatment technology, representing 67% of all existing wastewater treatment plants (WWTPs) across Canada. Aerated lagoons use mechanical aeration to provide dissolved oxygen for biological treatment of wastewater. These systems can efficiently remove carbonaceous pollution, whether measured as BOD or COD, and play an essential role in pollution control.
Watermark, Fall 2008.PDF

Chemical dosing systems are used in various water treatment applications, such as polymer feed (sludge dehydration, flocculation and coagulation), caustic soda (neutralization and pH control), sodium hypochlorite (water disinfection) and more.
Environmental Sciences & Engineering_Nov.2008.PDF

Sand-ballasted settling is a highrate coagulation/flocculation/
sedimentation process that uses microsand as a seed for floc formation. The microsand provides a surface area that enhances flocculation and acts as a ballast or weight. The resulting floc settles quickly, allowing for compact clarifier designs with high overflow rates and short detention times.
Environmental Sciences & Engineering_January 2009.PDF

Unlike most large cities in Canada, which are subdivided into municipal districts, Calgary, Alberta, has a single municipal administration for its roughly one million people, and it supplies potable water to the city as well as some neighboring municipalities in the region. The city is also unique in that it has two water treatment plants located on two different water sources: the Bearspaw treatment plant is on the Bow River, and the Glenmore plant is on the Elbow River.
Business Excellence May 2009.PDF

Wet weather issues have evolved greatly over the last generation. From a side issue 40 years ago, they have reached the forefront of environmental concerns. Initiatives such as the Great Lakes Water Quality Agreement and directives from the Canadian Council of the Ministers of the Environment indicate that stormwater and combined sewer overflows (CSOs) can no longer be considered as inoffensive as initially thought.
Environmental Sciences & Engineering_May 2009.PDF

The Ravensview Water Pollution Control Plant (WPCP) currently provides primary level wastewater treatment from the City of Kingston, Ontario, including Pittsburgh Township and the Canadian Armed Forces Base in Kingston. The existing process at Ravensview WPCP includes: mechanical screening for pre-treatment, primary treatment with chemical enhancement, sodium hypochlorite dosing for disinfection and sodium bisulphite dosing for dechlorination. The treated effluent is then discharged into the St. Lawrence River.
Canadian Environmental Protection, May/June 2009.PDF

Aerated lagoons are extensively used throughout Canada for treatment of municipal wastewater. In fact, lagoons are, by far, the most popular wastewater treatment technology: they represent 67% of all existing WWTP's (wastewater treatment plants) across Canada.
Influents Magazine, Summer 2009.PDF

Stricter treatment and discharge regulations are forcing wastewater treatment plants in urban and high-growth areas to consider expanding or upgrading their systems. The challenge? Even if extra land is available, it's often not affordable. Fortunately, certain small footprint technologies now provide efficient high-rate treatment.
ES&E Magazine, Summer 2009.PDF