wooden_reefer
New member
http://reefkeeping.com/issues/2005-12/rhf/index.php
Here is an article cited by Bertoni that warns of flow in a denitrifier, coil, DSB and the like, being too slow (implied is the bed being too deep IMO).
H2S comes from too sources: decomposition of protein with insufficent oxygen and the reduction of sulfate.
If no protein gets into the denitrification filter, it is not necessary to have much discoloration, it seems to imply. The dark coloration frequently seen in a denitrification filter is solid iron sulfide.
A minute amount of protein will get into the nitrification filter, causing some discoloration.
To point is to avoid ORP so high that sulfate reduction takes place. This is the author's point of avoiding too slow a flow rate (sand bed too deep implied IMO) thru a denitrifier.
Another consideration is whether the iron sulfide would disappear even if H2S is no longer present. I think it won't. This is hard to gauge the current condition. Smelling the water coming out of a denitrifier for H2S may be important. For closed denitrifier like the coil, it may be good to make sure that the denitrification loop is open so that one can smell the water coming out of it.
Just a thought. Since the flow rate is slow, the amount of H2S introduced into the tank may be small, regardless.
Here is an article cited by Bertoni that warns of flow in a denitrifier, coil, DSB and the like, being too slow (implied is the bed being too deep IMO).
H2S comes from too sources: decomposition of protein with insufficent oxygen and the reduction of sulfate.
If no protein gets into the denitrification filter, it is not necessary to have much discoloration, it seems to imply. The dark coloration frequently seen in a denitrification filter is solid iron sulfide.
A minute amount of protein will get into the nitrification filter, causing some discoloration.
To point is to avoid ORP so high that sulfate reduction takes place. This is the author's point of avoiding too slow a flow rate (sand bed too deep implied IMO) thru a denitrifier.
Another consideration is whether the iron sulfide would disappear even if H2S is no longer present. I think it won't. This is hard to gauge the current condition. Smelling the water coming out of a denitrifier for H2S may be important. For closed denitrifier like the coil, it may be good to make sure that the denitrification loop is open so that one can smell the water coming out of it.
Just a thought. Since the flow rate is slow, the amount of H2S introduced into the tank may be small, regardless.
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