Project Information

Location: Long Plain First Nation, Manitoba

Project Type: Municipal Wastewater Treatment

Completion Date: June 2012

Treatment Objectives

Design Flow:
998 m3/day (0.264 MGD)

Effluent Quality:

  • 1 mg/L TAN (Summer)
  • 5 mg/L TAN (Winter)
  • 10 mg/L cBOD5
  • 10 mg/L TSS

Project Background & Challenges

First Nations communities in Canada, are faced with many challenges of maintaining a proper water and wastewater treatment facility. A number of First Nation treatment facilities are located in remote areas where cold climate conditions create difficult construction challenges due to limited road access areas, equipment, and certified personnel. With aging water and wastewater infrastructure many First Nation facilities are overloaded, and struggle to find the technical and financial resources to keep up with new federal regulations.

Long Plain First Nation (Ojibway) is a community located in the central plains region of Manitoba. Due to facility age and population growth, the existing SBR (sequencing Batch Reactor) was not meeting effluent quality requirements. An upgrade was required.

The Nexom Answer

Long Plain First Nation's treatment facility process flow

Long Plain First Nation's treatment facility process flow

In the spring of 2012, construction began on the facility upgrade. A two - cell, partial mix aerated lagoon based system was constructed on a green-field site for improved year-round TSS and BOD removal. The SAGR® process was installed to provide nitrification (ammonia removal); two vertical flow, continuous backwash sand filters with alum addition were implemented for final polishing and phosphorus removal. The water quality produced by the system allows for continuous discharge to the Assiniboine River

Ease of operation was a primary consideration during development of the SAGR®. There are no sludge or solids management requirements, making the operation and maintenance of the process similar to that of a conventional aerated lagoon. The only moving parts in the system are blowers supplying oxygen to the process. Process control requirements are limited to seasonal (twice a year) manipulation of the influent control valves.

Site Construction

System Performance

After successful construction completion, Nelson Environmental staff provided commissioning and operational training in June 2012. Since commissioning, the results have consistently been meeting the new federal regulations for all parameters.


Long Plain First Nation now has an operator-friendly, technologically advanced wastewater treatment system capable of handling the increasing population. The system will meet federal wastewater regulations, is environmentally responsible, and puts the Long Plain First Nation at the forefront of small community wastewater treatment in Canada.