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Wastewater Notes

Wastewater Notes






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  • Bacteria comes from the green word bakterion and means “small staff“.We will only talk about aerobic bacteria
  • Bacteria comes from the green word bakterion and means “small staff“.We will only talk about aerobic bacteria
  • Top picture is Sycamore plant in 1957 and bottom picture is the same plant in 2001
  • Bacteria comes from the green word bakterion and means “small staff“.We will only talk about aerobic bacteria
  • Bacteria comes from the green word bakterion and means “small staff“.We will only talk about aerobic bacteria
  • Bacteria comes from the green word bakterion and means “small staff“.We will only talk about aerobic bacteria

Wastewater Notes Wastewater Notes Presentation Transcript

  • Wastewater treatment
    How humans make use of nature
  • Outline
    1. What is wastewater?
    2. Where does the wastewater go?
    3. What is a wastewater treatment plant?
    4. Wastewater treatment steps
    5. Biological treatment & Bacteria
    6. Who works at a treatment pant?
    7. Cincinnati Wastewater Treatment Plants
  • What is Wastewater?
    Wastewater is a liquid waste, which consists of animal, vegetable, mineral or chemical matter in solution or in suspension with water
    It comes from residents and businesses who flush different matter + water down their toilets or pour it down their sinks and drains
  • Where does wastewater go?
    Wastewater drains into a network of pipes maintained by the local sewer service municipalities
    Sewer systems are built to collect and flow wastewater and rainwater using the natural slope of land, generally towards the sea front or to wastewater treatment plants
  • What is a wastewater treatment plant (WWTP)?
    A WWTP is the place where wastewater is treated to prevent contamination and destruction of our waterways, and our natural water resources
    It includes physical, chemical and biological processes to remove physical, chemical and biological contaminants
  • Water Treatment
    Screening & Filtering
  • Water Treatment
    Grit Chamber
    Primary Sedimentation
    Aeration Tank
    Secondary Sedimentation
  • Wastewater treatment steps
    Step 1
    Step 2
    Step 3
    Tertiary Treatment:
    Includes a final treatment to effluent (water) to increase the water quality, before the water is discharged to the natural waterways
    Secondary Treament:
    Includes degradation of biological content of the sewage such as are derived from human waste, food waste, soaps and detergent
    Primary treatment:
    Includes removal of large objects some solid materials like debris, gravel, sand or liquids like fats, oils and grease from the water
  • Biological treatment?
    In the aeration tanks microorganisms and wastewater are mixed, aerated, and maintained in suspension (activated sludge)
    In the secondary clarifier solids are removed and the activated sludge is returned to the aeration tanks
  • Biological treatment?
    The effluent (out-flowing water) from the primary treatment stage is sent to the secondary stage were the water is biologically treated
    Most treatment plants use an aerobic biological process, for which bateria are used
    Some bacteria (unicellular microorganisms) need oxygen and organic matter to live
  • Bacteria
    Bacteria are simple, colorless, one-celled organismsthat use soluble food and are capable of self-reprodcution without sunlight
    There are two main groups: aerobic and anaerobic. They can be found everywhere in soil, acidic hot springs, water, in animals, plants and in our body. There are one million bacterial cells in one mL of fresh water
    Bacteria are considered decomposers due to their indispensable ecological role of decaying organic matter in nature
    Humans make use of this by using them in secondary treatment stage to decompose organic matter in wastewater
  • Perfect Water Cycle – Eco-Boulevards
    * Source: pruned.blogspot.com
  • Who works at WWTP?
    • Civil engineers plan and design many parts of a WWTP
    • Chemical engineers design the primary and secondary stages and they also make sure that the cleaned water has a certain quality before it is discharged
    • Microbiolologists make sure that enough bacteria and oxygen is provided
  • WWTPin Cincinnati
    • There are 10 wastewater treatment plants in the greater Cincinnati area. They collect 200 million gallons of wastewater every day
    • The Sycamore Creek Wastewater Treatment Plant was originally built in 1957 with a design average treatment capacity of 1 million gallons per day (MGD). Since that time, the plant has been expanded three times (1966, 1970 and 1991) to increase treatment to its present capacity of ~20 MGD*
    * Source: MSD website
  • Jeopardy
    Why do we need to learn about wastewater?
    Wastewater is part of the water cycle
    Wastewater is water that cannot be treated
    Wastewater has to be treated because it is reused
    A and C
    Answer d
  • Jeopardy
    How do we use bacteria in a wastewater treatment plant?
    Bacteria are not used at all
    Bacteria are animals that eat organic matter
    Bacteria need organic matter and oxygen
    Bacteria need sunlight and CO2
    Answer c
  • Jeopardy
    How is water cleaned in the secondary treatment stage?
    With filters and screens
    With mechanical and physical methods
    Bacteria and oxygen
    All of the above
    Answer c