Want to install a sewage treatment plant in an independent house - Need details regarding capacity, make, cost and footprint

I am looking for a suitable sewage treatment plant for installation in an independent house not having municipal sewer connection. My house has 4 bath rooms and toilets and there are 5 occupants in the house. 

 

Can anybody suggest whether such a small capacity STP is available in the market and if so

  • what should be its capacity
  • who is the manufacturer/ vendor of such a small unit
  • what process will be used
  • how much will it cost
  • what is its foot print size

Thanks in advance

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