In article . com,
says...
http://www.envirolet.com/

Do you think that local authorities accept such toilets instead of a
full blown septic tank?

Only if the toilet is the only fixture in the building, e.g. a cabin
without indoor plumbing. Otherwise, you still need something to treat
other potentially-hazardous sewage from sinks, showers, laundry, etc.

--
is Joshua Putnam
http://www.phred.org/~josh/
Braze your own bicycle frames. See
http://www.phred.org/~josh/build/build.html