Greywater Management in Low and Middle-Income Countries - SSWM

Project Framework
PhD thesis
University of Leeds
School of Civil Engineering
Implementation: 1997
Monitoring: 1997–2000
Wastewater treatment systems for
hotels, houses, schools, and halls
of residence, day-time occupancy
buildings (28 full-scale systems)
Harindra Corea, E.J., 2001.
Appropriate Disposal of Sewage
in Urban and Suburban Sri Lanka.
Doctor of Philosophy Thesis, The
University of Leeds, Leeds, UK,
270 pp
Sri Lanka belongs to the rapidly developing countries. In the last
two decades migration from rural to urban areas has increase the
established and implemented. Every new building plan has to include
an on-site wastewater disposal system approved by the authorities
(CEA, 1990). However, the existing regulations or guidelines do not
stipulate any system design requirements.
Within the framework of his PhD thesis, Harindra Corea (2001)
selected, evaluated and implemented appropriate, cost-effective
technologies for on-site wastewater management systems in urban
and suburban Sri Lanka. The goal was to develop practical selection
and design guidelines.
The thesis presents different treatment technologies with main
focus on hotel greywater and blackwater treatment systems. This
greywater treatment plant was constructed for the Swiss Residence
Hotel. Based on the experience gained by the Swiss Residence Hotel,
further systems were implemented at the hotels Ivy Banks and Coral
Sands.
Kitchen
Laundry
Gardening
Q=7.4m 3 /d
Grease and
grit trap
Septic tank
Anaerobic filter
HRT = 1.5 d
Dosing
chamber
Vertical-flow planted filter
h=0.6m
A=0.4m 2 /p.e.
In a 40-room tourist hotel in Kandy, a treatment system for kitchen
and laundry greywater was set up to extend an already existing
blackwater treatment system following complaints from neighbouring
residents and regulatory authorities (greywater treatment was originally
Examples of Greywater Management Systems
80