Investigation of simultaneous denitrification and nitrification in a Pasveer oxidation ditch
conference paper
An investigation concerning simultaneous denitrification and nitrification in a Pasveer oxidation ditch was
conducted at TNO in the Netherlands between June 1993 and March 1994. The purpose was to evaluate the
performance of nitrification and denitrification of the conventional oxidation ditch and to establish
possible approaches to optimizing nitrogen removal. The research shows that almost complete nitrification
can be achieved under normal conditions. Below a 00 (dissolved oxygen) concentration of 1.0 g m"3
(the highest level) and/or a temperature of 4 °C. the efficiency of nitrification was strongly affected. The
efficiency and rate of denitrification were insufficient; a denitrification efficiency of about 45 % was
accomplished during the investigation period. The bottleneck for denitrification seems be the availability
of readily biodegradable organic substances to denitrifying micro-organisms. Several approaches are
therefore proposed to optimize denitrification. The separation of aeration and mixing is suggested to create
strictly anoxic zones so that the potential of denitrification possessed by small sized sludge particles
may be fully utilized. A separate contact tank or zone is proposed to make organic substances available to
denitrification prior to oxidation by oxygen; in this way sludge bulking can be also controlled. Submerged
carriers for biofilm growth are alternatively proposed to enhance denitrification.
conducted at TNO in the Netherlands between June 1993 and March 1994. The purpose was to evaluate the
performance of nitrification and denitrification of the conventional oxidation ditch and to establish
possible approaches to optimizing nitrogen removal. The research shows that almost complete nitrification
can be achieved under normal conditions. Below a 00 (dissolved oxygen) concentration of 1.0 g m"3
(the highest level) and/or a temperature of 4 °C. the efficiency of nitrification was strongly affected. The
efficiency and rate of denitrification were insufficient; a denitrification efficiency of about 45 % was
accomplished during the investigation period. The bottleneck for denitrification seems be the availability
of readily biodegradable organic substances to denitrifying micro-organisms. Several approaches are
therefore proposed to optimize denitrification. The separation of aeration and mixing is suggested to create
strictly anoxic zones so that the potential of denitrification possessed by small sized sludge particles
may be fully utilized. A separate contact tank or zone is proposed to make organic substances available to
denitrification prior to oxidation by oxygen; in this way sludge bulking can be also controlled. Submerged
carriers for biofilm growth are alternatively proposed to enhance denitrification.
TNO Identifier
289696
Publisher
TNO
Source title
Bron onbekend
Place of publication
Delft
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