Aqua Medic Nitratereductor NR 5000 Manuel d'utilisation - Page 4

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Ammonium + Oxigen

(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. Overfertilisation/Eutrophication. The aquarium is overfertilised, 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

of oxigen, many bacteria are able to use nitrate as a substitute for oxigen for their metabolism.

2 Nitrate ----> nitrogen gas + 3 oxigen

2 NO 3

---->

The oxigen is used for the metabolism, the nitrogen is excreted into the water. Nitrogen gas is

a natural compound of the water and totally harmless.

It is, however, necessary to increase the metabolism of the bacteria, so that they can reduce

enough nitrate. For this reason, the nitrate removing bacteria have to be fed with organic

substances. The tablet feed Denimar

completely by the bacteria. The only waste product is CO

The flow rate through the Nitratereductor is very slow. This is a main difference to other

aquarium filters, where the water is often treated once per hour or even more often. The water

in the Nitratereductor should have a retention time of 2 - 4 hours. It is however sufficient to

treat it once per week. If the filter is adjusted correctly, the water leaves the filter nearly free

of nitrite and nitrate.

4. Description of the Nitratereductor

The

provide

surfac

Bactoballs. They create an ideal microclimate for denitrification.

----- > Nitrite + Oxigen -----> Nitrate

(Nitrobacter)

Nitratereductor the water is treated anaerobically. In the absence

N 2

+ 3 O 2

Nitratereductor consists of a reaction vessel of 30 l volume. To

material

for

the

contains organic substances, that can be used

bacteria,

the

filter

filled

with