Jul 18, 2003, 4:12 AM
Post #17 of 25
Now now roger, you touch on something which seems controversial. Before we all go into "fierce" discussion on this subject, i think we should remind ourselves that as long as nitrates are reduced in our tank/ponds, we rather leave the chemist and geologist to handle the detailing.
if you must know more, then i suggest you go to Yahoo and type "At long last i have built a TT" . here you will find quite a lengthy discussion on the by-product of TT.
To extract some info from the above website
" the "normal" desciption of the nitrification process is in gross error. The end result products of nitrification, and denitrification, by biofiltration are nitrous oxide, N2O, and nitric oxide, NO. Mostly and usually the end product is nitrous oxide. Nitrous oxide is actually 50% heavier than air, so does not tend to rise in an air column, you are simply mistaken about that. So to get it out of a trickle tower, you must either have open sides of the tower, or have good air exchange of the trickle tower with the surrounding air.
Both nitric oxide and nitrous oxide can dissolve in the water to react and make more nitrates and nitrites, if they are not degassed soon after they are produced in biofilms. That is the entire principle of trickle tower filters, namely better degassing to remove these end products of biofiltration before they dissolve in the water to make more nitrites and nitrates.
You probably won't believe me, but I have read approximately 1250 published papers on the biofiltration process in the scientific literature. They sometimes openly laugh in the papers about the drivel written in books and on the internet about biofiltration. It can be a deep subject when studied for a while.
The main point is that I always advise folks with solid wall trickle towers never to use distribution plates, to use spray bars instead. Because with a distribution plate, and a solid wall, the nitrous oxide and nitric oxide can't get out, and the filter is no better than submerged media, where the nitrogen goes around and around in a big cycle, sometimes getting out a bit in waterfalls where it degasses a bit.
I hope this helps some with your misconceptions. I do not expect your wierd weed to disappear with your TT construction, but hope you prove me wrong.
"Have a pleasant day"
YES-HAVE A PLEASANT DAY ROGER. NOW WE KNOW WHY MHLIM'S VEGETABLE BASKET WORK WELL AS A TT.