Originally Posted by Soothing Shrimp
pics showing up now for me. weird...
Did you plant the n'joy in the substrate?
No. The whole point was to develop hydroponic
plants. So they are all bare except for the equisetum (horsetail rush), which, after more reading, DK learned needs silicates and therefore substrate. She also nearly killed the horsetail when it first arrived, putting it aside, busy with other things, and it dried out a few days before she remembered it!
IN OTHER NEWS:
Wetwedding project 25
We continue our discussion, in review:
The options on a commercial scale are:
- Ion Exchange using strong base anion resins regenerated with NaCl
- Biological Denitrification using Methanol or Ethanol addition
- Electrodialysis or Electrodialysis Reversal
- Reverse Osmosis
We've ruled out (2) above on the basis of capacity
Now, we look at (1).
There would be two approaches to this. One would be to put resin pouches into filters. The second approach would be a centralized system with a treatment canister of resin.
In the first case, it's labor intensive, expensive, and wasteful, as the pouches would then be disposable upon exhaustion, or it would be a pain to manually regenerate and repackage them. It's also probably not even feasible as the pouches would exhaust quickly in an automated system (DK does water changes TWICE DAILY, not ONCE WEEKLY - that's a LOT more nitrates to soak up) and not all at the same time, causing a logistical nightmare.
In the second case, it's somewhat less labor intensive, as there is only one canister to babysit, but it would still need periodic refilling and then a system to backflush it with salt solution in between refillings, to regenerate the resin.
Nitrate specific resin is on the order of $400 per cubic foot. To run DK's waterworld, she'd want a canister with a few cubic feet (which would probably need to be replaced every quarter or six months), and an automated flush/regeneration system. This system is very expensive and also heavily reliant on proprietary product
. Not only that, it pumps more salt into DK's septic system, which references pKaz's question
. She is already pumping salt into her water for the whole house treatment method - her well water is so acidic it ate through her plumbing, forcing her to both re-plumb her mains in the house
, and also put the whole house on an acid-treatment system for all the water. This whole house water treatment system adds a heavy sodium (salt) load to ALL her water that ends up in her septic tank. So therefore, she has an outside constraint that discourages her from putting too much water or too much salt into her drains, as it sucks up the capacity of her septic drainfield and isn't good for it. DK nixes anion binding resin, due to these reasons.
She next looks into (3) - Electrodialysis. It's a cool concept, and would work, but is too new a technology to have any products available on a non-commercial scale or price range.
OK, so some of you who fancy yourself clever had honed in on (4) days ago.
Yeah, big deal. So DK plunks down a B. Franklin or two or three or.... and gets herself an RO system.
Or, did she?...