There are two other on-going paper discussions that might find your query interesting. One describes an integrated sanitation project in Germany for about 300 inhabitants (listname: ET-W4) and the other is on the use of "living machines" for wastewater treatment. This has also been used for self-sustaining communities (e.g. Findhorm Bay community with also about 300 inhabitants and 10,000 visitors per year) (Listname: ET-TOR).

I suggest you join these lists to see the various options available so that you can decide on the system.
E-mail listserv@segate.sunet.se and write (e.g.) :
SUB ET-W4 Michael Skowronski (Comforce/RhoTech)
SUB ET-TOR Michael Skowronski (Comforce/RhoTech)

Michael:  where is this self-sustaining community located, how many inhabitants are there, what land area does this community occupy, ....could you provide more information about this community, is this a farming community, a residential community, etc. etc .
 

Michael Skowronski (Comforce/RhoTech) <a-mskowr@MICROSOFT.COM> wrote
>I belong to a group that is in the process of creating a fully
>self-sustaining community.  We will be building a digester as a way to
>process our human and animal waste, for the gas that is produced, and for
>the usage of the effluent as nutrients in an automated system such as
>hydroponics.  The problem I am facing is that I have not yet found someone
>who has such a working model.  So I would also be interested in learning
>from anyone who has used the digester effluent in a hydroponic/aquaponic situation.