Need a cost effective & reduced footprint wastewater treatment system for a newly constructed house in Bangalore,Karnataka

I'm  from Bangalore and i'm searching for a grey or black water treatment system for my newly constructed house. The catch in my building design is, it is having only a very small area which can be planted / open to sky ( 1'6" x 40' ). When I approched a consultant they said as there is no much open space the scope for the implementation of the conventional reed bed system is very less. 

I'm searching for a system which can handle Max 2500 LPD of black and gray water. In my plan ground floor is left for parking hence the avilable 35 feet x 35 feet can be utilized for the UG tanks or sumps. Is there an option that will help fit in a water treatment system in such a restricted area? 

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