Greywater Management in Low and Middle-Income Countries - SSWM

three septic tanks and soakage pits operating satisfactorily. The hotel also required
a system to treat the kitchen wastewater.
Wastewater from both the main and staff kitchen is pretreated in two separate
2 /p.e., 0.6 m height). The VFPF is not lined to allow percolation of the
limestone to raise the pH and reduce odour, turned out to be very effective. An
table during the rainy season. The system was designed for treatment of 3.0 m 3 /d
kitchen greywater.
During the four-months monitoring period, the Coral Sands treatment system
functioned well, especially when compared to the treatment system of the Swiss
Residence Hotel. During hot and sunny periods, such as in the afternoons, some
mild malodour was reported. This problem was overcome by shading the bed and
increasing the vegetation cover.
Table 5-14 contains the implementation costs of the three greywater treatment
systems described.
The cost data for the Swiss
Residence Hotel was adapted
Costs 1 Costs/p.e. Size
(system comprising a second
USD USD
bed). The Coral Sands system
12,900 69 186 p.e. Gardening/drainage
as the septic tank and anaerobic
Ivy Banks
973
4,200
35
220
28 p.e.
19 p.e.
heavy-duty covers to withstand
heavy tourist buses parked on
1: Estimate based on Sri Lanka Rupee (LKR) and conversion factor of
LKR 1,000 = USD 9.7 (March 2006)
top. The hotel, located on loose,
sandy soil with a high groundwater table, required special boarding to support
excavation as well as continuous dewatering during construction, which partly
explains the high construction costs.
Coral Sands Hotel clearly reveals that it is impossible to provide general cost
Greywater Management in Low and Middle-Income Countries
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