University:
Massachusetts Institute of Technology
Course:
1.85 | Water and Wastewater Treatment Engineering
Academic year:

2023
Views:

128

Pages:

18
Author:

basteishx23y

SCREENING Coarse Screens 6 to 150 mm Hand Cleaned Chain Driven Microscreens < 50 µm Mechanically Cleaned Reciprocating Rake Fine Screens < 6 mm Static Wedgewire Catenary Drum Continuous Belt 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. Step Simple Manually Raked Screen (flow is from left to right) Figure by MIT OCW. Adapted from: Mara, D. Domestic Wastewater Treatment in Developing Countries. London, UK: Earthscan, 2005, p. 79. THE PROPORTIONAL WEIR Plate WS Channel wall h1 Opening x Rejected Area Y Area = Total rejected area WIDTH 3 inch (75 mm) Min 3 inch (75 mm) Min 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. A Horizontal-Velocity Grit Settling Chamber with a Proportional Weir Control Section Stop gate Q Q Proportional weir Grit storage A PLAN Proportional weir WS WS A WS Weir plate WS h Q Weir opening Q Grit storage A Section A-A B PROFILE & CHANNEL CROSS 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. 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. Stop gate Grit storage W Q Q Parshall flume A Plan A WS WS WS WS h Q Q Section A-A A Grit storage B Profile & channel cross section A horizontal-velocity grit settling chamber with a Parshall flume 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. 140. Parabolic section WS Design section Space for mechanical conveyor equipment Ideal parabolic cross section and design cross section for chamber with a Parshall flume. 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. (A) IN-LINE Equalization Basin Preliminary Treatment Flow Meter & Controls Controlled Flow Pumps Final Effluent Raw Primary Treatment Waste Secondary Treatment (B) SIDE-LINE Sludge Processing Supernatant Preliminary Treatment Raw Waste Equalization Basin Overflow Structure Flow Meter & Controls Final Effluent Primary Treatment Secondary Treatment Sludge Processing Supernatant Controlled Flow Pumps EQUALIZATION BASINS 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. FLUCTUATING VOLUME DETERMINED BY HYDROGRAPH Q gpm Q l pm Qavg 0 12 6 A.M. 12 6 P.M. 12 0 Time Required Volume 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.

Lecture 13: Wastewater Screening, Primary Treatment

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