In-House Greywater Sewage Treatment Systems: Proposing a Comprehensive Decision-Making Framework for Micro-Scale Solutions at the Point Source

by Gokul Lal K V1, Tarun Kumar2Vandana D Ravishankar (presenting author)3, Unais Sait3, Rahul Bhaumik3, Sanjana Shivakumar4, Kriti Bhalla4

1: East Point college of engineering and technology, Bangalore, India; 2: Indian Institute of Science, Bangalore, India; 3: PES university, Bangalore, India; 4: Ramaiah Institute of technology, Bangalore, India


This paper seeks to develop a conceptual model targeting integrated greywater sewage treatment at the household level of private residences in the context of an urban setup, through a comparative analysis of the existing conventional systems of centralised and decentralised sewage treatment in urban and suburban areas. A critical approach to the life cycle costing of small sewage treatment plant (STP) systems, against the environmental and health costs of polluted water in lakes, which are an important component to sewage treatment and an integral part of urban planning, is adopted in this study. A literature case study of the sewage treatment system at Vrishabhavathi Valley STP, and a qualitative assessment of its management strategies is attempted. A preliminary business-oriented implementation strategy, involving all stakeholders of the treatment process, is proposed to conceive a sustainable model for integrated greywater management systems. Manufacturing agencies involved in the production of decentralised STPs will be interviewed, along with residents of apartments that operate their own decentralised STPs. This is done to better grasp the logical dimensions of the greywater sewage treatment at the household level, and to assess the merits and demerits, along with prospective markets for such decentralised strategies of greywater sewage treatment. In conclusion, a comprehensive decision-making framework aimed at micro-scale solutions to in-house greywater sewage treatment will be necessary to address the water management crisis in the city of Bangalore, India. Moreover, this solution has the potential to reduce water consumption sourced from depleting resources, without having to compromise on the water demand of the city.