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During secondary filtration, air bubbles are blown up through the water to help bacteria turn toxic ammonia into nitrates. Credit: By Darrow Montgomery
Pondering the unlikely beauty of D.C.’s wastewater treatment plant.
Credit: By Darrow Montgomery
Credit: By Darrow Montgomery
Pity the poor rube who falls into the nitrification tanks! Credit: By Darrow Montgomery
Put the biosolids on Solids Road. Credit: By Darrow Montgomery
Bacteria hard at work making nitrogen out of nitrates. Credit: By Darrow Montgomery
Credit: By Darrow Montgomery
Credit: By Darrow Montgomery
Credit: By Darrow Montgomery
Credit: By Darrow Montgomery
Aeration pumps run on more than 4,000 volts and 2,000 horsepower each. Credit: By Darrow Montgomery
