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Water Treatment. Chapter 11. Sewage Treatment. Rationale More than 500 pathogenic bacteria, viruses, and parasites can travel from human or animal excrement through water. Natural Processes In many areas, outdoor urination and defecation is the norm.

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water treatment

WaterTreatment

Chapter 11

sewage treatment
Sewage Treatment
  • Rationale
    • More than 500 pathogenic bacteria, viruses, and parasites can travel from human or animal excrement through water.
  • Natural Processes
    • In many areas, outdoor urination and defecation is the norm.
      • When population densities are low, natural processes can quickly eliminate waste.
  • Artificial Wetlands Are a Low Cost Method
    • Natural water purification
      • Effluent can be used to irrigate crops or raise fish for human consumption.
lincoln wastewater facilities
Lincoln Wastewater Facilities

Underneath and throughout Lincoln are over 1,000 miles of sanitary sewer lines and 16 pumping stations

114 employees at solid waste and wastewater facilities

Theresa Street Facility

27th & Cornhusker

20 million gallons of water daily

Northeast Facility

5 million gallons of water daily

Combined this would fill Holmes Lake in 3.5 days

lincoln northeast treatment facility
Lincoln Northeast Treatment Facility

7. solids dewatering

6. solids digestion

5. disinfection

4. secondary clarifiers

1. screening and grit basin

2. primary clarifiers

3. aeration basin

municipal sewage treatment
Municipal Sewage Treatment

1. Primary Treatment - Physical separation of large solids from the waste stream

  • screening, pumping, grit removal
    • get the big stuff out
    • material collected hauled to landfill
  • primary clarification
    • removes settleable solids
    • removes floatable materials like grease
    • 2-4 hrs

primary clarifier

slide6

Municipal Sewage Treatment

2. Secondary Treatment - Biological degradation of dissolved organic compounds

  • Biological Treatment
    • Aeration basin
    • removes pollutants with bacteria and protozoans
    • must be aerated
    • 8 hrs
  • Secondary clarification
    • separates treated wastewater from microorganism (from aeration basin)
  • Disinfection
    • chlorination or UV light
slide7

Municipal Sewage Treatment

Anaerobic Digesters

2. Solids processing - Biological degradation of dissolved organic compounds

  • solids digestion
    • anaerobic digesters to stabilize organic solids
    • produce methane gas (CH4) which can power turbine to generate electricity
    • 18-20 days
  • solids dewatering
    • removes excess water
    • solids (organ rich material)

Belt Filter Press Dewatering

slide8

Municipal Sewage Treatment

Subsurface Biosolids Injection

2. Solids processing - Biological degradation of dissolved organic compounds

  • land application
    • soil amendment and fertilizer
  • alternatively dewatering is replaced by collecting liquid and using it as fertilizer on city owned land
municipal sewage treatment1
Municipal Sewage Treatment

3. Tertiary Treatment - Removal of plant nutrients (nitrates and phosphates) from secondary effluent.

    • Chemicals, or natural wetlands
    • Lincoln does not have tertiary treatment
  • In many US cities, sanitary sewers are connected to storm sewers.
    • Heavy storms can overload the system, causing by-pass dumping of raw sewage and toxic runoff directly into watercourses