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Old 06-10-2007, 01:33 AM   #25
atom
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Quote:
Originally Posted by atom View Post
There are mainly 3 types of denitrator used by hobbyist.

1. Coil denitrator
2. Carbon based denitrator
3. Sulphur based denitrator
What is a coil denitrator?

Here is a simple coil denitrator.


How does it work?

The coil denitrator is feed oxygen rich water via a pump or gravity siphoning. This O2 rich water enters the 50' coiled tubing until exiting within the bottom center of the chamber. Aerobic bbs will populate the tubing wall and the oxygen will be strip via nitrification process, same as the bio-filtration system.

Inside the UPVC piping, an low oxygen or anoxic environment will be created and permits anaerobe to populate and the bio-balls soon become host to millions of colonies of bacteria that proceed to multiply. As the water reaches the top of the chamber, it exits through the output fitting.


Problems?

The anaerobe depends on the DOC in the water column for feeding. Since the amount DOC differs from tank to tank, the denitrification level is never stable. The anaerobe population will increases and decreases accordingly. Secondly, the tubing tends to plug and thus clog.
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