Faecal Sludge Management for a Town in Hills

What are the technological options available for faecal sludge management for a small scale town in hills, with low temperatures climate?

I need this information for the treatment of septage collected from septic tanks from inaccessible areas.

The proposed capacity of the septic tanks is 3KLD.

Please also add information on the availability of the pre-fabricated plants for faecal sludge management.