I have always thought this, what a waste of processing just to flush it down the drain!.
Then again the amount that leaks out of knackered water mains probably outweighs it anyway..
This is a point made very well with more historical and scientific background information than any sane person needs to know in the
Humanure Handbook, which also gives details of how to make your own hygienic dry toilet.
It works very well, it's the only kind of loo, we have here at the farm
A friend in Norway used one of these while living in the woods for over a decade and reports that they work well and never smell.
Nope, no smell, esp when it has a urine separating device, the urine is stored to then be used for composting with woodchip.. Ideal Carbon to Nitrogen ratio, which when, composted makes a great soil conditioner.
The poo goes into an earth floored secure sided container to which sawdust is added after every contribution.
A twin chambered unit means that one side can be left to compost for eighteen months, while the other side is in use.
After this period, on emptying, there are about four* barrowloads of what essentially looks like semi composted dry sawdust.
No smell, at all, and this can be used as a sparing dressing around fruit trees.
*This is for continuous use, year round, with on average about four people in residence, plus visitors / staff.
No need for a septic tank, no potential groundwater contaminants