[Greenbuilding] ventilation and urine-diverting dry toilet

[Joe Killian]

Reuben,
    Yes, easily.  Think muffin fans, as in desktop computers.
    Many sizes & speeds and voltages.  I'd go with 120V AC, or with 12V 
DC powered with a wall-wart 12V supply.
    Keep to lower flow models to keep noise down.  Keep to larger (3" or 
4") diameters, again to keep noise down (smaller fans with same airflow 
are much noisier).  Use a 2" T to pull the air off, and adapters to 
change up to a size accommodating the fan.

    I'm currently using a 4" 120V muffin fan to ventilate our utility 
room, to keep the cat-box odors down.   Works great.
    I've also got a couple 12V DC fans ventilating our small greenhouse 
- powered directly with 5Watt solar panels.  When the sun shines, the 
fans run.
    If your local electronics shop or Radio Shack doesn't have what 
fits, look at digikey.com, search for fans.  Many Many options and a 
selection facility.

Joe


On 1/9/2018 11:56 AM, Reuben Deumling wrote:
> Quite a few years ago I imported four Ekologen EcoDry toilets from 
> Sweden. These are porcelain toilets that send the poop and the pee 
> into separate (installer supplied) vessels. While the idea was 
> extremely inspiring, the reality has been somewhat less fantastic. The 
> poop falls  through an 8" pipe into a bucket, and a handful of sawdust 
> is dumped after. That part works beautifully. Not once has there been 
> any smell.
>
> The urine is sent through a 1-1/4"(?) flexible hose that came supplied 
> with and is attached to the porcelain unit into a vertical 2" ABS pipe 
> and from there into a bucket that sits outside in the free air, and is 
> dumped as needed.
> The problem - the only problem - is that the urine smell in the 
> bathroom can be strong. Visitors, e.g., higher usage, sends the smell 
> index shooting up, whereas day-to-day usage by one person doesn't 
> cause much discomfort. And of course folks' sensitivity/sense of smell 
> varies a lot.
>
> The toilet was supplied with a micro-flush button which would have 
> sent a small amount of water (1/10 of a liter?) through the urine 
> section. I initially hooked this up, but I discovered a casting flaw 
> in the porcelain which sent a bit of the water not out the drain but 
> through a crack not visible from any angle I could devise onto the 
> floor. I talked to the manufacturer about that but they were not 
> helpful, did not take any useful responsibility, so we've always used 
> a small cup to splash a bit of water to chase the urine.
>
> Recently I swapped in a wood toilet seat/lid for the OEM plastic one 
> which allowed me to attach a gasket between porcelain toilet and seat 
> and between seat and lid. This made a disappointingly small difference 
> to the ambient odor.
> _
> _
> _So now to my question:_ do low-power small fans exist that you could  
> recommend for installation in the 2" ABS vent? My sense is that these 
> exist but I am not familiar with any specifics.
> My hope for this fan would be that it would create a very slight 
> negative pressure in the bathroom, drawing any smell out the vent 
> rather than letting it escape into the room. Ideally it would also be 
> switchable from inside the bathroom.
>
> Or perhaps some of you have experience with his or similar situations 
> and can recommend other strategies I've not thought of?
>
> Thanks very much.
>
>
> _______________________________________________
> Greenbuilding mailing list
> to Send a Message to the list, use the email address
> Greenbuilding at bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/greenbuilding_lists.bioenergylists.org/attachments/20180109/d65e28fa/attachment.html>