Hi Trevor,
I have no idea about this biochar technology. I also would love to know more about it. If you could get in touch with Professor Reginald Mitchell. I also know that some universities in Germany like Hamburg-Harburg (Prof. Ralf Otterpohl) and TU Berlin ( gasolar.us/2011/07/biochar-fertilizer-from-sewage-for-tanzania/ ) also research on biochar. I do not have a contact however. Would be great if you can find out more.

Best regards,
Christian

Dear Carl,
let me reply on your question about

I'm afraid I don't understand the distinction you make between urine diversion and composting systems and how they are not part of ECOSAN ? ... do you have links to something clarifying what you are referring to ?

I was trying to say that UDDTs and composting systems do not necessarly needs to be built with the purpose of reuse but also for safe disposal. Just like the eThekwini Project where urine is infiltrated and the dehydrated faecal matter is burried. www.susana.org/lang-en/case-studies?view...peitem&type=2&id=791

Especially in large scale systems the management of excreta and making sure it is hygically completely safe might be a barrier for ecosan, nevertheless the toilet technology might still be the most appropriate but with disposal instead of reuse.

Regards,
Christian