Upgraded WWTP needed to handle variable strength landfill leachate

The original system at Seneca Landfill consisted of three bio-towers filled with outdated trickling filter media. At the time, only two were in operation. All of this contributed to the system being unable to reduce effluent ammonia to required levels. A decision was made to convert the existing bio-towers to aerobic BioPortz™ MBBR reactors from Nexom….

Read More
Relocating First Nation Town Meant Building a Completely New Wastewater Treatment System

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
AMMONIA AND DIESEL: Northlands Dënesųłiné First Nation tackles two challenging foes with its simple, sustainable wastewater treatment plant

“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
Lagoon Upgrade Meets Ammonia Limits

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
Lagoon Based Wastewater Treatment Process Provides Nitrification in Glencoe, Ontario

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...

 

Read More
Nutrient removal: Are lagoons still a viable wastewater treatment option?

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