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Design and operations of the Kaldnes moving bed biofilm reactors
Authors:Bjorn Rusten  Bjrnar Eikebrokk  Yngve Ulgenes  Eivind Lygren
Institution:

aAquateam—Norwegian Water Technology Centre, P.O. Box 6875, Rodelokka, N-0504 Oslo, Norway

bSINTEF Water and Environment, Klaebuveien 153, N-7465 Trondheim, Norway

cBiodesign, Raschs vei 78, N-1185 Oslo, Norway

Abstract:The moving bed biofilm reactor (MBBR) was developed in Norway in the late 1980s and early 1990s. It is covered by several patents and has been a huge success world-wide for treatment of municipal and industrial wastewaters. In addition, MBBRs have been successfully used for biological treatment of drinking water as well as for water treatment in fish farms. The MBBRs use plastic biofilm carriers of a unique design, to maximize the active biofilm surface area in the reactors. Reactors have insignificant headloss, no need for periodic backwashing and no susceptibility for clogging. This paper describes the fundamentals of the MBBR. It has a major emphasis on nitrification with the type of biofilm carrier used in fish farms, but briefly touches upon removal of organic matter and denitrification. Major factors influencing the nitrification rates in MBBRs are discussed in detail. Results from small-scale MBBR tests, as well as from commercially operated MBBRs at full scale fish farms are presented. The data are from both freshwater and marine applications.
Keywords:Biofilm carriers  Biological treatment  Freshwater systems  Marine systems  Nitrification
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