www. wsforum.org Article (Type of Paper) Greywater Recycling Systems in Urban Mixed-Use Regeneration Areas: Economic Analysis and Water Saving Potential Sara Zadeh 1, , Rachel Lombardi 2 Dexter Hunt 3 *and Christopher Rogers 4 1 Postgraduate PhD student / Department of Civil Engineering, College of Engineering and Physical Sciences, University of Birmingham, UK 2 Associate Director of Business Development, International Synergies Ltd, Birmingham, UK 3 Birmingham Research Fellow / Department of Civil Engineering, College of Engineering and Physical Sciences, University of Birmingham, UK 4 Professor of Geotechnical Engineering / Department of Civil Engineering, College of Engineering and Physical Sciences, University of Birmingham, UK E-Mails: sxm942@bham.ac.uk (S.Z.); d.r.lombardi@bham.ac.uk (R.L.); huntd@bham.ac.uk (D.H.); c.d.f.rogers@bham.ac.uk (C.R.) * Author to whom correspondence should be addressed; Tel.: +44-121-414-3544 Received: / Accepted: / Published: Abstract: Greywater (GW) recycling for non-potable uses such as toilet flushing is a management strategy to meet urban water demand with substantial water saving. This paper proposes a system that collects GW from residential buildings and recycles it for toilet flushing in both residential and office buildings. The total cost and water saving of standard sanitation technology were compared with 5 other options requiring less or no potable water use in toilets. Scenarios compare: no GW, individual GW, and shared GW systems with and without low-flush appliances. Typical residential and office buildings in urban mixed-use regeneration areas in the UK were used for these analyses. The results implied that constructed wetland treatment technology with standard appliances is more economically and environmentally viable than other scenarios. By increasing the water and wastewater OPEN ACCESS