Environmental Engineering Reference
In-Depth Information
Table 2
CostcomparisonforaerobicreactorversusUASBR
Sr. No.
2-stage aerobic reactor
Anaerobic followed by aerobic reactor
1
Mechanical equipments
AT blower
(2 × 1,200 m
3
/h)
5,60,000
UASBR feed pump (60 m
3
/h)
68,000
Sludge pump
(2 × 10 m
3
/h)
50,000
Sludge recirculation pump
(1 m
3
/h)
50,000
Sec. clarifier mechanism
1,80,000
Lamella clarifier
5,00,000
Diffuser (100)
4,50,000
UASBR internals + Gas flare
system
40,00,000
Total
12,40,000
46,18,000
2
Civilequipments@6,000INR/m
3
Aeration tank (1,145 m
3
)
68,70,000
UASBR tank (700 m
3
)
42,00,000
Sec. clarifier (60 m
3
)
3,60,000
Total
72,30,000
42,00,000
Grand total (1 + 2)
84,70,000
88,18,000
3
Operating cost @ 4.5 INR/kWh (INR/Annum)
AT blower
10,08,000
UASBR feed pump
1,41,000
Sec clarifier mechanism
52,000
Sludge pump
29,000
Sludge recirculation
pump
42,000
Total
11,02,000
1,70,000
(
)
Extrainvestment in caseofUASBR
=
88 18 84 70
348
.
−
.
Lacs INR
=
.
Lacs
INR
(
)
Savings in operatingcost
=
11 02 170
932
.
Lacs INR
Lacs INR
−
.
=
.
Payback period
=
=
348932
037
.
/
.
.
year
=
4 5
.
months
The capital cost associated with the installation of anaerobic reactor is more than
that of aerobic reactor for achieving almost similar reduction in organics but the
operating cost is almost six times less which makes the UASBR a better choice for
developing countries.
Reduction in GHG Emissions
The degradation of organics by anaerobic bacteria results in methane and carbon
dioxide. Methane is a source of energy which can be utilized for heating require-
ments or power generation. Generation of methane and reduction in operating cost
results in huge reduction of GHG emissions.
Search WWH ::
Custom Search