IS A COVER REQUIRED ON THE UPSTREAM LAGOONS?
No. A cover is not required on the upstream lagoons as the SAGR is designed to treat effluent at very low temperatures, eliminating the need to retain process heat.
IS THERE DATA FROM SYSTEMS OPERATING AT FULL DESIGN LOADS AND FLOWS?
Yes. Nexom has collected thousands of data points from dozens of sites, including sites operating at 100-200% of full design flows. Facilities across North America have shown consistent nitrification year round with water temperatures as low as 0.2°C.
Are there systems operating in climates as cold or colder than the proposed application site?
Yes. Installations across Canada and the USA include some of the coldest populated areas in North America. Data from these sites demonstrate that the SAGR provides consistent nitrification in hostile climates.
Does the system require any wasting of solids (WAS)?
No. Nitrifying biomass generate very few solids. Most of the solids generated by the heterotrophic bacteria removing the BOD are contained upstream in the lagoon system. The SAGR is designed so that any solids that are generated in the bed aerobically digest within the pore space of the media. The SAGR retention time is adequate designed such that any inert solids that do accumulate in the bed do not need to be removed throughout the design life of the system.
What are the maintenance requirements?
The only moving parts in the system are the blowers supplying oxygen to the SAGR process. A simplified control scheme manages the day-to-day operation of the blowers. Typically, an operator will perform a system inspection using a check-list and on occasion change lubricating oil.
Is the system compatible with future upgrades?
Yes. The SAGR nitrification module is fully compatible with other Nexom lagoon-based process. Phosphorus can be removed with the infini-D Zero-Downtime Phosphorus Removal process (which includes chemical addition prior to cloth disk filtration) and a wide range of Total Nitrogen limits can be met through the use of pre-anoxic zones within the lagoon system or tertiary denitrifying sand filters.