Guess How Much This Plant Had to Invest for Permit-Compliant Nutrient Reduction

A Washington district faced a new effluent limit on total inorganic nitrogen. Optimized aeration helped achieve compliance without capital investment

Guess How Much This Plant Had to Invest for Permit-Compliant Nutrient Reduction

The team at the Lake Stevens Sewer District includes, back row, from left, Duane McFall, lead maintenance; Travis Rosencrans, supervisor; Eric Echols, operator; and Ryan Bolden, laboratory analyst. Front row, Greg Bradley, operator; Chris Ayriss, senior operator; and Daniel Savoie, operator.

Everything was running fine at the Lake Stevens Sewer District. Then the Washington Department of Ecology imposed a new permit limiting total inorganic nitrogen. The district had less than a year to comply.

A physical plant upgrade to meet the permit limit could have cost...

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