Incorporating a bidet attachment to a compost toilet

Hey everyone,

Looking to see if anyone has successfully incorporated a bidet attachment to a compost toilet.

Long story short I've just bought a bare (very bare) old farmhouse in central France with a good chunk of land. Plan is to build an outdoor compost toilet whilst doing up the place. Thinking a double chamber toilet but open to ideas and suggestions as relatively new to this and build has yet to begin. One thing I really don't want to go without is a bidet. A foot pump actioned bidet from a rain water reservoir is the best idea I can think of. Obviously more rudimentary options such as a handheld squirt bottle are an option but would prefer the fancy nob controlled permanent attachment if possible.
I guess my questions are:

a) Has anyone successfully fit a bidet attachment to a compost toilet?

b) would the excess moisture affect the composting/mouldering in any negative way? As the water would primarily go down the compost side.

Many thanks

ps: if an intro is required I apologise, I couldn't see the section

Welcome to the forum.

I hope you find someone that has done this.

My first thought was that using a bidet would add a lot of water to the composting toilet so that it would stay wet a long time.  

Does it have a urine diverter which would also divert the water?

Welcome to Permies, Joey!
And welcome to the 'let's renovate this ancient farmhouse in central France-club' , I'm here too, and know of some others around us

A bidet attachment to a compost toilet sounds like a good challenge. I think you'd need to have a urine diverter, and probably some means to warm up the water of the bidet in the winter?
I personally don't know of anyone who's combined bidet and compost toilet, but am eager to find out the results to your question.

Here's the motherboard to how Permies works - happy reading, writing and communicating!

Hi Nina and Anne,

thanks for the warm welcome.
Another permie in central France, yay! Not that far either, i'm in 87.

A urine diverter is what I had in mind but as you say Anne I'm a bit concerned about the excess moisture that would be added to the compost. I've found this thread that seems to suggest that wouln't be great: https://permies.com/t/27894/Composting-Toilet-Bidet It also rightfully points out that dirty/fecal water going down the urine side would not be a good idea either.

Your mention of winter Nina also made me realise that preventing it from freezing over winter would be a challenge. Maybe a handheld squeeze bottle type would actually be better/easier. Still need to figure out how problematic excess moisture to the compost would be though.

Excess moisture can be addressed with a lot of very dry saw dust. I don’t have a urine diverter. They tend to block up and I find dealing with pure urine way worse than the mix of it all. I am quite happy with the simple bucket system. More water would just mean more saw dust needed and shorter intervals for each bucket. So in total a bit more work.

I've never used a bidet and have only used a composting toilet on occasion. Could you make a two seater? One for... doing your business, and then scoot over a foot or so and use the bidet attachment? Then you could have a specific setup for the bidet that would not add excess moisture to the composting side.

while the freezing is definitely an issue to think about, the actual temp of the bidet water (in my experience) is not a big deal. When I installed mine I heard a lot of pushback about "let's see you use it in the winter" and lo and behold, all the scoffers are using it in the winter with no complaints! That said, my pipes do not freeze in the winter, and if you're somewhere where they do, that seems critical.

I understand people run the output of normally plumbed toilets into vermicompost tubs and just let the water drain out the bottom and into a lagoon or something. If that really works, the bidet couldn't possibly be a problem. I also think this is a problem worth solving and look forward to hearing what you do.

Also, our first bidet was a bolt-on "Tushy" with a regular toilet. It was cold water only, above an unheated garage, in Minnesota. It was sometimes uncomfortable, but better than using TP like a savage. In our country house, we installed a Toto Washlet and the bidet water (along with the seat) is warmed.