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1. Product description
The AB Aqua Medic Nitratereductor consists of the reaction vessel (height = 50 cm, volume
approx. 10 l).
The reaction vessel is filled with AB Aqua Medic Bactoballs. In the top of the filter, the circulation
pump is placed (capacity of 300 l/h).
One can with Denimar-Powder to feed the bacteria is included.
2. Theory
Nitrate is coming into the aquarium via 2 different ways:
- with the tap water, with every water change or with the replacement of the evaporated water
- by biological reactions in the aquarium.
These biological reactions are responsible for the farmost biggest part of the increase of the nitrate
level.
How is nitrate produced in the aquarium?
When the animals are fed with dried, living or frozen food, proteinaceous substances get into the
aquarium. These are the basics of the diet for the animals. A big part of the nitrogen, from the food
is, however, excreted into the water. This nitrogen is metabolised by bacteria, living in the aerobic
filter via the toxic intermediate substances ammonium and nitrite to the less toxic nitrate. These
biolochemical reactions take place in the presence of oxygen:
The bacterium Nitrosomonas oxydises Ammonia to Nitrite, the bacterium Nitrobacter the Nitrite to
Nitrate.
Ammonium + Oxygen
(Nitrosomonas)
In most aquaria, nitrate is the endproduct of bacterial metabolism and accumulates in the water.
Only higher water plants and algaes are able to remove this nitrate from the aquarium water.
What is the effect of nitrate in the aquarium?
1. Overfertilization/eutrophication: The aquarium is overfertilized, the algae growth increases
and cannot be controlled anymore.
2. Toxic effects to the animals. Many invertebrate animals in sea water tanks are very sensitive
to higher nitrate levels.
3. Working principle of the Nitratereductor
In the AB Aqua Medic Nitratereductor, the water is treated anaerobically. In the absence of
oxygen, many bacteria are able to use nitrate as a substitute for oxygen for their metabolism.
2 Nitrate ---->
nitrogen gas + 3 oxygen
2 NO 3
---->
The oxygen is used for metabolism, the nitrogen is excreted into the water. Nitrogen gas is a
natural compound of the water and totally harmless.
10
All manuals and user guides at all-guides.com
----- > Nitrite + Oxygen -----> Nitrate
(Nitrobacter)
N 2
+
3 O 2
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