Greywater Management in Low and Middle-Income Countries - SSWM

is given in Table 5-11.
After
anaerobic
5
mg/l 129 < 2 < 2
mg/l 212 12 11
mg/l 76 6 3
mg/l 37 14 9
mg/l 12.6 2.1 0.8
Nitrate mg/l 2.1 5.4 5.3
mg/l 2.4 – 0.3
(cfu/100 ml) – 5,600 650
E. coli (cfu/100 ml) – 580 390
Removal rate
g/p/d g/p/dl %
43.3 0.2 99
5
36.6 0.5 99
50.0 1.7 97
10.6 0.3 97
6.2 0.5 92
Operation and
maintenance costs
USD/p 1
0.66
1.06
0.53
2.25
1: Estimate based on Malaysian Ringgit (MYR) and conversion factor
MYR 1 = USD 0.27 (July 2006)
Different operation and maintenance
activities are carried out on a regular basis.
Desludging of the oil and grease trap
months. The pump is inspected weekly
to assess or avoid damage by particulate
matter. Inspection and if necessary cleaning
is also conducted regularly to ensure
and maintenance costs are given in
Table 5-12.
Costs
Table 5-13 contains the capital costs of
the described greywater treatment system.
If a new housing estate is built, the capital
costs will be reduced (approximately
USD 230 per person) as piping for separate
wastewater types can be installed from the
and larger housing systems, designed for
500 and 1,000 persons, the total capital
costs per person will decrease to USD 165
and USD 127, respectively.
learned
The initial purpose of the Hui Sing
Garden EcoSan demonstration project
was to prove that the concept chosen is a
technically viable approach to decentralised
greywater treatment in Sarawak. The
second and equally important aspect was
to ascertain whether the greywater facility
Examples of Greywater Management Systems
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