51 MLD STP BY SBR
(C - Tech) at
Attapur, Hyderabad.
BY
M.VENU N091918
K.REVATI N100525
B.LALITHA N100671
M.NAGA LAKSHMI N100804
1
Contents
Introduction
Objective
Sewage Treatment Plant (STP)
Special Feature
Conclusion
2
Introduction
Pollution in the Musi River
Current Status
Resolution to the Musi River Pollution
Role of HMWS&SB (Hyderabad Metropolitan Water
Supply & Sewage Board)
3
Objective
Treatment of Wastewater from Defined Places by using
51 MLD STP with C-Tech Basin Technology.
Reducing the BOD, COD, TSS etc.
4
STP Location 5
Courtesy : Google earth
STP 3D View 6
Courtesy : Autocad 3D Drawings
STP Process 7
Inlet chamber: Coarse screened out
raw sewage will be taken by inlet
chamber.
Screening: Particles with the size
will be removed by fine screens.
Courtesy : 51 MLD STP Site
STP Process Cont. 8
Detritor Units : Grit Settling due to
gravity.
Grit Chamber: Grit particles in the
screened water will be settled by
using the classifier mechanism.
Courtesy : 51 MLD STP Site
STP Process Cont. 9
Parshall Flume: Used to calculate
volumetric flow rate.
C-Tech Basins: Raw sewage after
primary treatment is taken by gravity
into the c-tech basins. C-tech basins
present here is six in number.
S.NO FLOW (MLD) NUMBER OF
BASINS
1 1-15 2
2 15-30 4
3 30-100 6
4 100-150 8 Courtesy : 51 MLD STP Site
STP Process Cont. 10
C-Tech Basins: Each basin operates
with sequential phase of filling,
aeration, settling and decating. It
is a cyclic process.
Filling – aeration: During the fill –
aeration sequence mixed liquor
from the aeration zone is recycled
into the selector.
1) Anoxic denitrification of nitrates in the biological selector zone of
c-tech.
2) Bio-degradation of organics including phenol present in the waste water
by extended aeration process.
Courtesy : 51 MLD STP Site
STP Process Cont. 11
3) Oxidation of sulphides in the wastewater.
4) Co-current nitrification and denitrification
of ammonical nitrogen in
the aeration zone.
5) Removal of phosphorous.
Settling: After the aeration phase the
biomass settles under perfect
settling conditions.
Decanting: After settling the supernatant
is removed from the top using
a decanter. Courtesy : 51 MLD STP Site
STP Process Cont.…. 12
Chlorine mixing and contact tank:
Decanted effluent will be carried to
chlorine mixing and contact tank
by RCC Channel.
Treatment Results:
S.NO Parameter Raw Sewage Treated Effluent
Max Min Avg Max Min Avg
1 pH 7.80 6.95 7.33 7.69 7.09 7.28
2 TSS (mg/L) 372 200 256 24 5 12
3 BOD (mg/L) 220 120 144 24 5 13.8
4 COD (mg/L) 372 256 296 44 16 24
5 E.Coliform
(MPN/100 ml)
5.0x10^5 2.1x10^5 2.8x10^5 1000 75 100
Courtesy : 51 MLD STP Site
STP Process Cont. 13
Advantages:
1) PLC based intelligent control in complete Plant.
2) Introducing C-Tech basin technology.
3) Introducing the SCADA (Supervisory Control And Data Acquisition)
4) Economically beneficial.
5) Sludge obtained from STP would be used in agricultural purposes.
Disadvantages:
1) More Power Consumption.
2) Maintenance cost is high.
3) The Parshall flume used here is not giving the accurate outflow.
Case study
Why Parshall flume?
Ans: It is used for the flows that contain suspended solids, as in
wastewater treatment plant.
Flow rate through a parshall flume under free flow conditions is
Q𝑓𝑟𝑒𝑒 = C. Ha
n
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Case study Cont. 15
From table for throat width
W = 30 cm we get c = 0.6810
n = 1.5225
Q𝑖𝑛𝑓𝑙𝑜𝑤 = 1.3280 𝑚3
𝑠
Q𝑜𝑢𝑡𝑓𝑙𝑜𝑤 = 0.6810 x 1.61.5225
Q𝑜𝑢𝑡𝑓𝑙𝑜𝑤 = 1.3920 𝑚3
𝑠
Courtesy : Open channel flow measurement - Harlon H.Bengston
Case study Cont.
Finally we concluded that for the specified parshall flume
Qinflow ≠ Qoutflow
If we maintain the throat thickness of
parshall flume we can get the accurate
results.
16
Courtesy : Google Images
Special Feature 17
SCADA:
Here the controlling is done by using Automation Control System called
SCADA (Supervisory Control And Data Acquisition).
SCADA was fully PLC (Programmable logic Controller) based intelligent
control resulting in complete plant operation which is a major factor in
reducing operation cost.
All key function like RAS, Sludge wasting, Aeration intensity, Cycle time
control, Decanting rate etc., are automatically controlled as well as
data logged.
The DO Concentration in the basin is continuously monitored using a DO
Sensor.
Special Feature cont. 18
Courtesy : 51 MLD STP Site
Special Feature cont. 19
Courtesy : 51 MLD STP Site
Conclusion 20
As per the data available at site and physical observation a
conclusion that the plant was running smoothly and the required
efficiency of treatment is achieved for safe disposal of sewage into
Musi River as per the norms of river standards.
As we already know that Musi River is highly polluted it is required to
construct so many STP Plants like this to achieve desired conditions.
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