Primary Processes Waste Water Treatment
Transcript of Primary Processes Waste Water Treatment
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SCREENING
Coarse Screens 6 to
150 mmMicroscreens < 50 m Fine Screens < 6 mm
Hand CleanedMechanically
CleanedStepDrum
Chain Driven Reciprocating Rake Catenary Continuous Belt
Static Wedgewire
Figure by MIT OCW. Adapted from Metcalf & Eddy Inc., G. Tchobanoglous, F. L. Burton, and H.D. Stensel, 2003. Wastewater Engineering: Treatment and Reuse, Fourth Edition. McGraw-Hill,New York.
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Simple Manually Raked Screen (flow is from left to right)
Figure by MIT OCW.
apted from: Mara, D. Domestic Wastewater Treatment in Developing Countries. London, UK:
arthscan, 2005, p. 79.
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h1
Area
Opening
WS
x
Y
Plate
3 inch(75 mm)
Min
3 inch(75 mm)
Min
Channel wall
Rejected
Area = Total rejected area
WIDTH
THE PROPORTIONAL WEIR
Figure by MIT OCW.
Adapted from: Reynolds, T. D., and P. A. Richards. Unit Operations and Processes in Environmental
Engineering. 2nd ed. Boston, MA: PWS Publishing Company,1996, p. 142.
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Q
Q
Q
Q
Proportional weir
Stop gate
WS WS WS
WSh
A
A
Proportionalweir
plat
A
B
PLAN
Grit storage
Grit storage
We
Weir opening
Section A-A
PROFILE & CHANNEL CROSS SECTION
A Horizontal-Velocity Grit Settling Chamber with a Proportional Weir Control Section
Figure by MIT OCW.
Adapted from: Reynolds, T. D., and P. A. Richards. Unit Operations and Processes in Environmental
Engineering. 2nd ed. Boston, MA: PWS Publishing Company,1996, p. 141.
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Figure by MIT OCW.
Adapted from: Viessman, W., Jr., and M. J. Hammer. Water Supply and Pollution Control. 7th ed.
Upper Saddle River, NJ: Pearson Education, Inc., 2005, p. 353.
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WSWS WS WS
W
Stop gate
hQ
Q Q
Q
PlanA
B
A
A
Grit storage
Parshall flume
Profile & channel cross section
A horizontal-velocity grit settling chamber with a Parshall flume control section.
Grit storage
Section A-
Figure by MIT OCW.
Adapted from: Reynolds, T. D., and P. A. Richards. Unit Operations and Processes in Environmental
Engineering. 2nd ed. Boston, MA: PWS Publishing Company,1996, p. 140.
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WS
Ideal parabolic cross section and design cross section for chamber with a Parshall flume.
Parabolic section
Design section
Space for mechanicalconveyor equipment
Figure by MIT OCW.
Adapted from: Reynolds, T. D., and P. A. Richards. Unit Operations and Processes in Environmental
Engineering. 2nd ed. Boston, MA: PWS Publishing Company,1996, p. 143.
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Figure by MIT OCW.
(A
)
IN
-LIN
E
(B)
SID
E-LIN
E
Raw
Preliminary
Treatment
PreliminaryTreatment
Overflow
Structure
Equalization
Basin
Controlled Flow
Pumps
Controlled Flow
Pumps
Sludge Processing Supernatant
Sludge Processing Supernatant
Flow Meter
& Controls
Flow Meter & Controls
EQUALIZATION BASINS
Final Effluen
Final Effluent
Primary
Treatment
Primary
Treatment
Secondary
Treatment
Secondary
Treatment
Waste
Raw
Waste
Equalization
Basin
Adapted from: Reynolds, T. D., and P. A. Richards. Unit Operations and Processes InEnvironmental Engineering.
2nd ed. Boston, MA: PWS Publishing Company, 1996.
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12
0 0
Qavg
126 A.M.
FLUCTUATING VOLUME DETERMINED BY HYDROGRAPH
Time
Q
gpm l
Q
pm
12 6 P.M.
Required Volume
Figure by MIT OCW.
Adapted from: Reynolds, T. D., and P. A. Richards. Unit Operations and Processes InEnvironmental Engineering.2nd ed. Boston, MA: PWS Publishing Company, 1996.