Water recycling showers on the market (they don’t recycle all the water though)
I have no idea what the price is, as usual they don’t want to say, so I assume it is too much. Or maybe I should just say no price, no interest… in buyin it, anyway, but still would be interesting to know more about the sensors and filtration approaches used.
There seems to be another one in development here.
I had previously searched “water recycling shower” while thinking about a system that could be used at Burning Man, and not found much, dunno how I missed these. I think I wrote a blog post about it, I dunno.
After learning about water treatment technology for the greywater recycling system a while back (a bunch of blog posts around here somewhere), it became apparent to me that while we divide water in to blackwater, greywater, and potable water there are also many finer categories, there is “dark grey” water and “light grey” for instance. On the supply side, clearly you don’t need to demand the same level of cleanliness for the water you shower in as what you drink, though “potable” water is the category these are both usually lumped into.
So if you had a separate water recycler unit for the sink, the shower, the dishwasher, etc. that could make the recyclers easier to build, because the variety of contaminants you need to remove from the water is reduced, and the water does not have to be cleaned to the same high level. Not drinking or cooking with the water from the recycler could help a lot too. If urine is recycled you could use the water to compensate for evaporation in the other systems, not drink it. Hypothetically the cost could be lower because the system as a whole does less treatment so you buy less stuff, but the cost could wind up not being that much lower anyway, in reality when the treatment capacity of the parts etc. are whatever is available and probably too big and therefore expensive,or one big filter doesn’t costs much less than 3 third-size ones….
The Russian space station MIR apparently used this segmentation approach to some degree. The different water streams were treated and then stored and used separately, but the International space station combines all the water streams including urine (but not the water from feces which is only 200 ml per day) and then treats it all to drinkable level. Mind you both their budgets are a little higher than ours… You can find some documents if you search this blog about the ISS water recycling system, that describe in some detail how it works.