Swedish experience with deammonification process in biofilm system

• Treatment of supernatant from dewatering of digested sludge was performed in a pilotplant scale at Himmerfjärden wastewater treatment plant in the Stockholm region. A moving bedbiofilm reactor was used with Kaldnes rings as support material. Deammonification is a two-stepprocess technology in which the first step involves oxidation of part of the ammonium to nitritefollowed by oxidation of remaining ammonium with the formed nitrite into nitrogen gas(anammox). The two processes can be performed in two separate reactors or in one-stage biofilmreactor there the outer biofilm layer performs nitritation and an inner layer the anammox reaction.One-stage technology was started by seeding anammox bacteria into a step with partial nitritationand deammonification was rapidly established with an average nitrogen removal between 55 and88% with influent ammonium concentrations between 350 and 720 g N m-3. A removal rate ofabout 15 g N m-3 d-1 could be reached. The process could be monitored by pH and conductivitymeasurements. Nitrititation was the rate limiting step.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Vattenteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Water Engineering (hsv//eng)

Nyckelord

anammox

biofilm

deammonification

digester supernatant

nitritation

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