2.2. Removal of organic matter
For treatment of municipal and industrial wastewater,
MBBR plants have performed very well at
high organic loads and high substrate concentrations
(Ødegaard et al., 2004). The turbulence caused by the
high air flow necessary to maintain 3 mg O2/L in
aerobic reactors at high organic loads, has been more
than sufficient to maintain a fairly thin biofilm and
prevent clogging of the biofilm carriers.
At fish farms, the objective has always been to
nitrify, in addition to removing organic matter.
Because the heterotrophic biomass that removes
organic matter will out-compete the nitrifying biomass
at high organic loads, MBBRs for fish farms have
always been operated at very low organic loads. Even
though we know that MBBRs remove a lot of organic
matter in fish farminstallations, measuring the organic
loads, organic removal rates, and organic substrate
concentrations over the MBBRs has never been a
priority.
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