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Navigation Index 1 NOTE: Navigation Buttons Work in TV Presentation View ONLY End Show Begin Show Sewage collection Sewage overview Lift stations Pumping stations Pumping station movie Entering the facility Wastewater basics Wastewater basics 2 Wastewater flow diagram Primary treatment Screening Grit removal Grit removal systems Grit removal systems 2 Wastewater pumps Primary treatment Primary clarifier Primary settling basin Phosphorus removal Phosphorus removal 2 Floc deposits Secondary treatment Aeration tank Empty aeration tank Types of aeration tanks Types of aeration tanks 2 Secondary aeration tank Navigation Index 2
NOTE: Navigation Buttons Work in TV Presentation View ONLY End Show Begin Show Secondary treatment Secondary Treat. Anim. Trickling filters Oxidations ditches diag Oxidation ditches Oxidation ditches 2 Bacteria in wastewater Polymer addition Final clarifiers Final clarifier Final settling tanks Traveling bridge type Circumference type Sand filters Sludge handling Sludge dewatering Sludge options Disinfection chlorinator Disinfection ultraviolet Sludge digestion Wastewater discharge Tertiary treatment Tertiary treatment 2 Microstrainers Drum filters Reed beds Navigation Index 3
NOTE: Navigation Buttons Work in TV Presentation View ONLY End Show Begin Show Credits TV presentation instructions
Waste Water Treatment Virtual Field Trip (Operations of Wastewater Treatment) produced by: Awesome Guides, Inc. Pen
Sewage line pipe installation
After the grits and inorganic solids are removed, the remaining treated liquid (called effluent) is discharged leaving treated solids (called sludge or biosolids) Storm Sewer
Lift Station Waste water flows by gravity whenever possible. When this waste is moved against gravity, i.e. up a hill, lift stations are used! A lift station contains pumps to lift waste water on its way to the sewage treatment plant.
A wastewater treatment plant receives a large percentage of the rain waters from a developed community. The pumping station moves large volumes of water to the sewage inlet portion of the facility. A supplementary volume of water from rain waters accounts for about 13% of the total volume of wastewater treated at many plants. This volume of water is negligible compared to that from infiltration, which is estimated at more than 30% of the waters found at the plant. Pumping Station
Entering a Waste Water Treatment Facility
Primary treatment uses gravity settling and screening to remove solids from liquid. Some BOD (biological oxygen demand,) removal. Secondary treatment reduces more BOD concentration. During this treatment, in an aeration tank, bacteria begins to digest organic material. This process allows for the settling of sludge. With activated sludge, microbial growth is suspended in the water and will eventually settle out in flocs, called flocculation. This settled sludge can be returned to the incoming water to maintain the necessary biomass for decomposition. Waste Water Treatment Basics (The details are described later on your tour!)
Tertiary treatment takes place in an oxidation tank. The treatment involves the removal of nitrogen, a element critical for explosive algae and plant growth when in high concentrations. Once the tertiary treatment is complete, the resulting water theoretically meets drinking water standards. Waste Water Treatment Basics (The details are described later on your tour!)
Waste Water Treatment Facility Flow Diagram
Grit removal is aimed at doing away with abrasive matter, sands and other heavy particles which could damage sludge treatment mechanical equipment and mire canals and tanks. Grit Removal
Grit Removal Systems Coarse Screen Removal
Grit Removal Systems Grid Remover
Primary Treatment Two types of clarifiers, also known as settling tanks 1 2
Primary Clarifier or Settling Tank Skimmers collect scum at one end of the tank and sludge at the other. Sludge and scum are moved to other areas for treatment. The Primary Clarifier removes about 25% of the pollutants in wastewater. Primary Clarifier
Influent Waste Water Primary Settling Basin Skimming Collection To secondary treatment To sludge treatment/disposal
To reduce the phosphorus in the water, a coagulant, ferric chloride or alum, is added upstream of the screens to destabilize colloidal particles. An anionic polymer injected at the exit of the grit chambers makes it possible to agglomerate the destabilized particles for flocculation, which rapidly sediment in the clarifiers. Ferric chloride or alum and the anionic polymer are received in a chemical products building. These chemicals are injected respectively in a manner proportionate to the total phosphorus load and to the flow of raw water.
Floc and other matter deposited at the bottom of the clarifiers form sludge. The matter floating at the surface of the clarifiers is scum. This sludge and scum are pumped to a sludge building for treatment.
Following primary treatment is secondary treatment. Primary Treatment is mostly a physical process. Secondary treatment is a combination of physical and biological processes. Aeration Tank Secondary Treatment Aeration
Secondary treatment is speeded up by blowing air in tanks of sewage where micro- organisms float freely & feed on bacteria. Aeration Tank
Bottom of empty aeration tank showing agitators
Types of Aeration Tanks One Side Spiral Flow Aeration (Even though there are different types of aeration tanks, all work in a similar manner, and essentially accomplish the same goals!)
Types of Aeration Tanks Fine bubble aeration Submerged Mechanical Agitator (Used to add air into the tanks)
Secondary Treatment Aeration Tank Primary effluent Aeration Tank Secondary Effluent Return Sludge Air Compressor Recycle Pump Final Clarifier
Secondary Treatment After biological treatment in the secondary or aeration tank(s), a secondary clarifier or settling tank removes remaining sludge and pumps it to an on-site sludge handling facility.
Secondary Treatment Animation (Note how air is pumped in at the bottom of the secondary tank.)
Secondary Treatment – Trickling Filters
Secondary Treatment – Oxidation Ditches
Oxidation Ditches Provides mixing, oxygen transfer and retention time for microorganisms to convert organics to more stable compounds.
Oxidation Ditches 2 Oxidation Ditch Oxidation Ditch System Rotor
Bacteria in Wastewater Bacteria is where most of the odor comes from!
Polymer is also added to the water after aeration to aid in a process called flocculation, whereby very small hydroxide particles stick together to form larger particles, called floc, which are more easily settled and removed. The polymer is mixed with the water in a rapid-mix tank
Following any form of secondary treatment, waste water is settled in tanks to separate the biological sludge from the purified waste water. Final Clarifiers
Types of Final Settling Tanks/Clarifiers Even though there are different types of final settling tanks, all work in a similar manor and essentially accomplish the same goals! Final Clarifiers allow more detention time for activated sludge to settle, be drawn off gradually, and returned to be mixed with incoming raw sewage, known as Return Activated Sludge. The process also removes floatable materials by skimming. The effluent water from the clarifiers then goes to the sand filters for further treatment.
Types of Final Settling Tanks/Clarifiers 2 Traveling Bridge Type
Types of Final Settling Tanks/Clarifiers 2 Circumference Drive Suspension Type
Sludge Dewatering Machinery
Sludge Hauling Truck Other Sludge Options
Disinfection Chlorinator Treated effluent is disinfected in several ways. Two techniques used are via ultraviolet lamps or chlorination with chlorine gas.
Disinfection UV Sterilizer This chamber is lined with ultraviolet lamps. There are 160 ultraviolet lamps in use in this stage of the plant.
Sludge Digestion Tank Sludge Digestion
Discharge of Treated Wastewater Discharge Locations
Sometimes, extra treatment is needed to give the waste water a final "polish". This is known as tertiary treatment. Tertiary treatment is aimed at improving the quality of effluent produced by a conventional biological treatment plant. It is intended that tertiary treatment should polish a good quality effluent. It is not a substitute for inadequate secondary treatment processes. Tertiary Treatment
Tertiary treatment can achieve a reduction in suspended solids BOD and ammonia. There are various types of tertiary treatment systems (some have already been mentioned), they are grass plots, clarifiers, sand filters, microstrainers, drum filters, reed beds, lagoons, and nitrifying filters.
Microstrainers under construction
The City of Dayton, Division of Wastewater Treatment MUC Wastewater Treatment Plant Wastewater Treatment Facility - Santa Cruz City Facilities Weirton Sanitary Board The Port LaBelle Utilities System Credits…………
TV Presentation Instructions 1.Each presentation opens to slide 1 of the navigation index list of slides. Press button to go only to the LAST slide viewed. Click speaker on slides with voice to replay sound. 2. You can easily navigate through the index of slides or the virtual field trip slides by using the up (back)* and down (forward) keyboard arrow keys, the forward button, or by clicking the left mouse button (forward only). 3. Use the buttons to go to the next slide during the virtual field trip or to a particular slide from the index page; use the button to return to the first index slide. 4. You can always press the button from an index slide to begin the field trip starting at the first virtual slide. 5. You can end a slide show by returning to any index slide using by pressing the button. End Show Return to Index Page 1 * You will need to press the up (back) arrow key twice or more on slides with speaker (voice) icons on them.
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Drawing on Slides To mark up slides during a presentation……….. To mark up slides during a presentation……….. During your slide show, right-click and point to Pointer Options. Note You must be in Slide Show view to see the Pointer Options command. To switch to the Slide Show view, on the View menu, click Slide Show. During your slide show, right-click and point to Pointer Options. Note You must be in Slide Show view to see the Pointer Options command. To switch to the Slide Show view, on the View menu, click Slide Show. Click Pen. Click Pen. Hold your mouse button down as you write or draw on your slides. Hold your mouse button down as you write or draw on your slides. You can also choose a different color for marking by pointing to Pen Color and clicking a color. If you don't want to disrupt the continuity of your presentation by right-clicking and navigating through menus, or you are using a Macintosh platform, you can use the keyboard shortcut CTRL+P to switch to using the pen and CTRL+U or ESC to revert back to the automatic pointer. You can also choose a different color for marking by pointing to Pen Color and clicking a color. If you don't want to disrupt the continuity of your presentation by right-clicking and navigating through menus, or you are using a Macintosh platform, you can use the keyboard shortcut CTRL+P to switch to using the pen and CTRL+U or ESC to revert back to the automatic pointer. Your markings are erased automatically when you move to the next slide. To move to the next slide when you are using the pen, use the DOWN ARROW key. Your markings are erased automatically when you move to the next slide. To move to the next slide when you are using the pen, use the DOWN ARROW key. Back to Usage Slide