I was thinking along the lines of that myself Will, at the very least maybe a circular flow style reactor; since I have had a few incidents of the pellets clumping up on me - it would be nice to find a more trouble-free way to run it (for now I'm just going to go with a larger reactor so that the pellets can move around more freely).
My guess on a recirculation/multipass reactor however is that it would probably be not as good. The mulm production of these pellets is insane and if not actively shed from the reactor, as it is produced, seems to act as a binding agent for the pellets and they eventually stop fluidizing and then you have to manually stir them up to re-energize them and you also end up releasing a LOT of mulm (I think there's such a thing as "too much of a good thing" in this case). Just my guess though.
Plus though, seeing as single pass is enough to emit effluent with 0 nitrates, there may not be that much benefit to going beyond that. My tank bioload is huge and single pass seems enough to make that zero.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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