Wwtp+ +preliminary+treatment, Formulas and forms for Water and Wastewater Engineering. University of Florida (FL)
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giuseppezuozojr

Wwtp+ +preliminary+treatment, Formulas and forms for Water and Wastewater Engineering. University of Florida (FL)

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Preliminary Treatment Devices in Waste Water Treatment

Preliminary Treatment Devices in Waste Water Treatment

Flow Measurement

Screens and Shredders

Grit Chambers

Pumps (HSD)

Preliminary Treatment

 Required to measure flow, remove solids > 1”, pump the wastewater, and remove sand and other heavy particulates

 WHY?

 Chlorine can be added for odor control

 FeCl3 can be added to help settling  Coagulation

Parshall Flume

 First unit process – measures flow and is equipped with a data acquisition system

 Advantage of flume

 Low head loss – why is this good?

 Smooth hydraulic flow – benefit?

 How do you maintain a constant flow?

Screen and Shredders

 Required to remove objects greater than ½- 1” (e.g., paper, twigs, rags, plastics) – WHY?; (BAR RACKS)

 Mechanically cleaned to remove objects from screens (debris landfilled)  Dewatered prior to hauling

 For WW flows w/ greater quantities of papers and plastics, can use screens w/ smaller openings (i.e., 1/8-1/4”)

 Design to keep velocity < 3 ft/s

Shredders

 Shredders or grinders – cut material into smaller ¼” pieces (Communitors)

 Requires regular maintenance so must design a bypass channel

 In the bypass channel would install a hand cleaned screen

Grit Chambers

 Need to remove “grit” to protect pumps, valves, and deposition (30m3-90m3/106m3 of WW)  Grit includes sand, seeds, coffee grounds, glass,

etc. Where is there a large source of glass and coffee grounds?

 Most commonly employed in WWTP  Velocity controlled – Sed. Basin

 Aerated – air causes a spiral roll “driving” the grit into a hopper

Equalization Basins

 Since WW does not flow at a constant rate (i.e., varies from hour to hour), you can design an equalization basin to maintain constant flow

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