Gray water re - use system for hostel in Hamirpur, Himachal Pradesh - Need a low cost treatment system

I am a Final year student studying civil engineering at NIT Hamirpur (H.P).  Me and two of my classmates are working on a project where-in we are proposing a water reuse system  for one of our hostels .

Our main objective is to reuse the gray water (waste water only from bathrooms ) for toilet flushing and gardening.

 - we plan to have the treatment system as close to the hostel as possible to reduce the pumping costs.
 - there is ample space available around the hostel for the treatment facility.
 - the hostel houses 360 students and 40 staff hostel staff members.

So, as per the CPHEEO Manual on water usage  thats about  28000   (400*70)   liters of gray water , per day from  bathing and washing .

So, kindly suggest a low cost  technology will be most suitable considering that it is going to a model for institutions in the region .

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Raghubir Singh Rawat
raghu_nith@yahoo.co.in

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