The new wastewater treatment system had to meet two key issues. The first was operations and maintenance (O&M), since it can be difficult to find individuals who possess the qualifications needed to run O&M-intensive treatment facilities in remote communities…. Secondly, the system needed to meet Canada’s 2012 Wastewater System Effluent Regulations (WSER), which stipulate not only that effluent un-ionized ammonia cannot exceed 1.25 mg/L, but it also cannot be acutely lethal under the Fisheries Act.Read More
“Simple in maintenance and simple in operation,” agrees Liliya Chunderova, P.Eng., speaking of the new Northlands Dënesųłiné First Nation wastewater treatment lagoon she and her colleagues at Tetra-Tech designed. Even the process train is simple: “A new lift station, a new force main, the two aerated lagoon cells, followed by two SAGR cells discharging continuously.” Chunderova is referencing Nexom’s SAGR® post-lagoon cold water nitrification system…Read More
In an article published in their special insert to the April 7, 2018 Winnipeg Free Press, the Lake Winnipeg Foundation profiled Nexom's SAGR technology as implemented at the Misipawistik Cree Nation (MCN) wastewater treatment plant...Read More
The City of Walker is located in Linn County, Iowa. The City’s wastewater treatment facility consisted of a two-cell, non-aerated, controlled discharge lagoon. The lagoons were permitted to discharge every 180 days during the spring and fall. However, the plant had reached maximum hydraulic capacity, and was required to discharge more frequently than allowed by their permit, due to lack of available storage. Read more...Read More
Effluent quality limits for municipalities discharging treated wastewater into watersheds have become more stringent in recent years. However, many communities struggle to find the technical and financial resources to keep up with these limits, due to restricted options for post-lagoon nutrient removal technologies. Read more...Read More
The Southwest Middlesex wastewater treatment facility in Glencoe, Ontario, was constructed in 1974-1975, with a rated capacity of 946 m3/day. This system comprised two facultative lagoons operating in parallel, with discharge into the nearby Newbiggen Creek in early spring and late fall. As of 2005, data showed that the facility was operating at maximum hydraulic capacity. Read more...
Lagoons have been a viable wastewater treatment option for many decades. Many lagoon facilities were constructed in the 1960s and early 1970s with a 20 to 30 year capacity for future growth. Facultative lagoons (stabilization ponds) were the treatment system of choice for most small to medium sized towns and cities. In many cases, mechanical treatment plants were not a viable option considering the high capital and operational costs in addition to minimal regulated treatment requirements. Read more...Read More