In response to your response to my comment
You might find this reference useful in your investigations into biodigestion.
Methane Digesters For Fuel Gas and Fertilizer
With Complete Instructions For Two Working Models
by L. John Fry
For more information on urine seperating toilets I think you will find a lot of info from the manufacturer.
THE DUBBLETT- SYSTEM is manufactured in Sweden by BB Innovation & Co. AB.
DUBBLETTEN`S unique patented design is based on two, well separated bowls, the one behind, for faeces, has a bulge which prevents an overflow of the flushing water infected with bacteria and viruses to the front, well separated, urine bowl.
THE DUBBLETT- SYSTEM IS INTENDED FOR ALL TYPES OF BUILDINGS
And since the start of serial manufactures, it has been installed in schools, museums, offices, and blocks of flats, small houses and in the leisure areas. As well as Sweden, Dubbletten has been installed in Australia, Spain, Italy, Switzerland, Finland and Denmark.
Bobby Bogdan Mrozowski
MD at BB Innovation & Co. AB.
“Risks with recycling of human waste”.
“The occurrence of micro-organisms is primarily concentrated in the faeces while urine as a rule does not contain illness-promoting organisms. The urine sorting system aims to sort the faeces from urine, but when the design of the urine sorting toilet is not optimal, there is risk that faecal microorganisms will mix with the urine”. Anna Olsson and Thor Axel Stenström, Institute of Infectious Diseases. Sweden
Thus in so far as the use of Histosol is concerned, the reason I suggest it’s use is that the difficult and non biodegradable compounds such as detergents, paper, oil, grease, hydrocarbons, phenols, etc. are potentially soil contaminants and as far as I understand are the main problems holding back the wider implementation of biodigestion as a source of energy and especially “fertiliser” supply.