Saskatoon’s Wastewater Facility to Produce Commercially-Available Fertilizer

Aug 15, 2013

Real Agriculture

The City of Saskatoon celebrated with Ostara Nutrient Recovery Technologies Inc. yesterday with the grand opening of the nutrient recovery facility at the city’s Wastewater Treatment Plant.

The system, which cost $4.7 million to install, is projected to produce per year 730 metric tons of 5-28-0 +10%Mg, slow-release fertilizer. Not only will this fertilizer eventually turn in a profit, it will also help the plant minimize operation and maintenance costs by separating out minerals essential to the creation of struvite.

Struvite (or magnesium ammonium phosphate hexa-hydrate) can prove very costly in wastewater treatment plants, particularly in the winter. With a solid, crystal structure, struvite forms cement-like deposits, particularly on rough surfaces and in areas of high flow turbulence, like pumps and valves. As you can imagine, the clogged arteries of the plant are inefficient and cleaning equipment can be difficult and costly, not to mention this build up often necessitates chemical intervention.

In Saskatoon, sludge must first travel from the treatment plant to the bio-solid facility. How? A whopping 12 km of pipes! And every day, those pipes see roughly 85 million litres of wastewater treated. So, the potential for struvite build-up is very high.

Read the full article at www.realagriculture.com

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