HWONG
Koi Addict
Apr 3, 2007, 2:23 PM
Post #28 of 32
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Re: [HWONG] Photo gallery - visit to Dr .Zhang's house
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This is a quote from one of Doc Conrad's Postings
"Many folks have documented how aerated trickle tower or shower filters outperform submerged media filters in fresh water service. So there is no doubt about the effect. I have done around 50 experiments on that subject myself with appropriate controls. TT's and shower filters reduce nitrates an order of magnitude better than submerged media filters. Submerged media filters reduce nitrates better when the media is heavily aerated, so enough degassing of the submerged media may make submerged media filters close to trickle tower and shower filters.
Okay, now you want to know why?
Yes, I have researched that subject for a few years now. I have read approximately 1000 published research papers by the professional biofiltration community trying to understand why myself.
After all that home experimental work, and all that reading of the scientific community's data, I think the reason trickle towers and shower filters reduce nitrates is that they don't form nitrates in the first place. As has been shown in many, many biofiltration research papers, if a trickle tower or shower filter is used, a cloud of nitrous oxide and nitric oxide comes off the media from those filters. The researchers show that such aerobic biofiltration converts nitrite directly to nitric oxide and nitrous oxide which then simply goes off into the air. No nitrate formed, therefore none to reduce.
I have verified that many times in my preferred shower filter DIY (Do It Yourself) cheap biofilters by observing the ammonia, nitrite, and nitrate in the original cycling of a virgin biofilter. The ammonia comes up, then the nitrite comes up, but never a trace of nitrate to measure."
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