An innovative greywater treatment system for urban areas ... - SuSanA

Table 10: Matrix of utility analysis; (by K. Löw)
Assessment criteria Weighting
Discretionary ∑=
100%
Rating input
Description of rating Rating
Info not
available Result
H Health and hygiene criteria 6% 0
H1 Quality of purified greywater 0 not considered
H2 Stability of permeate quality 0 not considered
highly enforced = 10,
Legislative requirements for
medium enforced = 5, low
wastewater treatment technologies,
enforced = 1, no
H3 quality directives 6 requirements = 0 0
E Economic criteria 39% 0
Direct governmental funding for
high = 10, medium = 5, low
E1 treatment plants 4 = 1, no = 0 0
Indirect incentives on greywater
high = 10, medium = 5, low
E2 treatment systems 4 = 1, no = 0 0
Investment costs of the system
high = 1, medium = 5, low =
E3 (treatment plant, piping system) 4 10 0
E4
Operating expenses (maintenance,
spare parts) 5
E5 Charge for energy (in general) 5
E6 Charge for drinking water (in general) 7
E7 Charge for waste water (in general) 7
E8 Price of land 3
high = 1, medium = 5, low =
10 0
high = 1, medium = 5, low =
10 0
high = 10, medium = 5, low =
1 0
high = 10, medium = 5, low =
1 0
high = 10, medium = 5, low =
1 0
T Functional and technical criteria 0% 0
T1 Yearly maintenance 0 not considered
T2 Stability of operation and quality 0 not considered
T3 Breakdowns 0 not considered
N Environmental criteria 41% 0
N1 Water scarcity (physical/economical) 12
N2 Freshwater quality 5
N3
Number of persons situated in the
building 8
high = 10, medium = 5, low =
1, no = 0 0
high = 1, medium = 5, low =
10 0
big amount (> 100 persons)
= 10, medium amount (10 -
100 persons) = 5, small
amount = 1 (< 10 persons) 0
N4 Accumulation of greywater 10
high (overnight
accommodation) = 10,
medium (operation in the
daytime + showering) = 5,
low (operation in the
daytime) = 1 0
N5 Sewer system available 2 no = 10, yes = 1
high = 10, medium = 5, low =
0
N6 Population/settlement density 2 1
high = 10, medium = 5, low =
0
N7 Urbanisation 2 1 0
S Socio-cultural criteria 14% 0
S1
General acceptance of greywater
reuse 5
high (toilet flushing,
irrigation, laundry) = 10,
medium = 5 (toilet flushing,
irrigation), low = 1 (toilet
flushing or irrigatin) 0
high = 10, medium = 5, low =
1 0
S2 Ecological awareness 5
S3 Pioneer in this area 4 yes = 10, no = 1 0
Degree of fulfilment Result [%] 0
n. a. citeria 0
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