DEWATS Cost and its Determinants
: a case study from India*
*Tsephel
Tsephel S,
S Vineeth K
K, Nair
Nair, A
Consortium for DEWATS Dissemination Society , Bangalore
DEWATS?
Decentralized Waste Water Treatment System
Surface level picture of a
Constructed DEWAT
Inside a DEWATS
Primary treatment
Secondary treatment
Fiber Glass DEWATS- Can be
installed underground
Tertiary
y treatment
Post treatment
What is the cost of DEWATS ?
Consortium for DEWATS Dissemination Society , Bangalore
Relevance
• DEWATS is not a standardized product in conventional sense
•
There is no liner relation between size and cost
• Mass-scale Dissemination requires more work on costing
• Limited academic literature coverage
Consortium for DEWATS Dissemination Society , Bangalore
Methodology
•
Basic Costing
– 63 DEWATS data –CDD Society, (RCC based unit)
•
Data Analysis Techniques
– Basic ANOVA , Regression
•
Cost comparison
– Case study
y : a single
g p
project
j
in Bangalore
g
Consortium for DEWATS Dissemination Society , Bangalore
Studyy Results
Bremen Overseas Research & Development Association (BORDA)
COST DRIVERS
• Total Cost = f {Price of inputs* DEWATS inputs
quantity}.
• DEWATS Inputs Qty = f {size of unit + combination of
modules}.
• Combination of module = f {Quantity of WW, Quality of
WW, structural requirements}.
Consortium for DEWATS Dissemination Society , Bangalore
Cost Function
modeling
d li
Consortium for DEWATS Dissemination Society , Bangalore
-
Cost per Unit
C
Capacity
it BEHAVIOUR OF PER UNIT COST
200000
COST PER UNIT VOLUME SETTLER
180000
COST PER UNIT CAPACITY - ABR
COST PER UN
NIT CAPACITY (INR)
160000
COST PER UNIT VOLUME - PGF
140000
COST PER UNIT VOLUME - TOTAL
120000
100000
80000
60000
40000
20000
0
0
20
40
60
80
CAPACITY ( IN CMT PER DAY)
Consortium for DEWATS Dissemination Society , Bangalore
100
120
Components of
1. Human Resource
cost cost
2.
3.
4.
5.
6.
Cements, bricks, sand, gravels
Steel
Pipes, fittings, planks, poles
Others :
Taxes –
Consortium for DEWATS Dissemination Society , Bangalore
-42 %
-38 %
-8%
-10 %
-02 %
A Case Study
Consortium for DEWATS Dissemination Society , Bangalore
Case Study Details
R id ti l H
j t B
l
• Residential
House P
Project,
Bangalore
• 448 homes, 2240 habitants
• 300 cu m wastewater plant
• Reuse for flushing,
flushing landscaping
• Alternatives – DEWATS™, FAB, ASP
Consortium for DEWATS Dissemination Society , Bangalore
Comparison
DEWATS™
Fluidized
Aerobic Bed
Reactor
Activated
sludge
8164745
6741750
5267500
Total initial cost of STP/cu m (INR)
27216
22473
17558
Total initial cost of STP/home (INR)
18225
15049
11758
Total initial cost of STP/sq ft (INR)
33
27
21
Initial capital cost comparison
Total initial cost of STP (INR)
Consortium for DEWATS Dissemination Society , Bangalore
Comparison
NPV of 10 year cost (10% discount rate
and
d 8% iinflation
fl i rate))
Maintenance cost drivers
Desludging of settler
Desludging of ABR
Maintenance of Anaerobic Filter
Maintenance of PGF
Consumables for sand filter
Consumables for carbon filter
Consumables for UV tube
Consumables for chemicals
Electricity charges
Labor/Wages
Annual maintenance contract (AMC)
Contingency spending for breakdowns
Total
Consortium for DEWATS Dissemination Society , Bangalore
DEWATS™
-118062
-36718
-21466
-1070301
-251461
0
-117349
0
-1468535
-502923
-167641
0
-3754456
Fluidized
Aerobic Bed
Activated
Sludge
0
0
0
0
-251461
-96124
-117349
-1950704
-4597493
-2011691
-335282
-76486
0
0
0
0
-251461
-96124
-117349
-1590913
-4464346
-2011691
-335282
-41072
-9436591
-8908238
Comparison
Maintenance cost drivers
DEWATS
Fluidized
Aerobic Bed
Activated
Sludge
Total NPV for 10 years maintenance cost
-3754456
-9436591
-8908238
T l NPV for
Total
f initial
i i i l capital
i l cost
-8164745
8164745
-6741750
6741750
-5267500
5267500
Total NPV for 10 years total cost
-11919201
-16178341
-14175738
Consortium for DEWATS Dissemination Society , Bangalore
Thank You
www.cddindia.org
UNIVERSITY OF
KWAZULU-NATAL
LPTP
POLLUTION RESEARCH GROUP
TED
W ASAZ A
Technologies for Economic Development
Consortium for DEWATS Dissemination Society , Bangalore
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91 080 28486700 / 28482144
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