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Biological Wastewater Treatment

Biological Wastewater Treatment. OVERVIEW DEFINE TERMS PURRPOSE ADVANTAGES DISADVANTAGES METHODS AND KINDS AEROBIC ANAEROBIC. DEFENITIONS. BOD - Biochemical Oxygen Demand- 5 DAY TEST COD – Chemical Oxygen Demand AEROBIC -Uses Air(Dissolved Oxygen)

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Biological Wastewater Treatment

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  1. Biological Wastewater Treatment

  2. OVERVIEW • DEFINE TERMS • PURRPOSE • ADVANTAGES • DISADVANTAGES • METHODS AND KINDS • AEROBIC • ANAEROBIC

  3. DEFENITIONS • BOD- Biochemical Oxygen Demand- 5 DAY TEST • COD – Chemical Oxygen Demand • AEROBIC-Uses Air(Dissolved Oxygen) • ANAEROBIC-Without Air- Byproduct is Methane • ANOXIC- Oxygen Source is Nitrates NO3 andNitrites NO2.

  4. PURPOSE: Optimization of a naturally occurring process that reduces contaminants in the water. Advantages: Treat large flow rates at low Operating Costs Removes Dissolved contaminants Disadvantages: Generates waste biomass

  5. BIOTREATMENT • Biological Treatment Methods • Sequence Batch Reactor (SBR) • Membrane BioReactor (MBR) • Attached Growth Biological Filters • Biological Aerated Filter (BAF) • Moving Bed Biological Reactor (MBBR) • Integrated Fixed Film Activated Sludge (IFAS) • Trickling Filters • 4) Anaerobic Treatment Processes • Upflow Anaerobic Sludge Blanket (UASB) • Expanded Granular Sludge Bed (EGSB)

  6. SEQUENCE BATCH REACTOR (SBR) • Batch aerated reaction process followed by a controlled sedimentation step. • Benefits: • Low capital costs • Tolerant to flow variations and loading variations. • Flexible fully automated process • Proven Technology Sequence Batch Reactor

  7. SEQUENCE BATCH REACTOR (SBR) • Disadvantages: • Larger footprint than MBR • Tertiary filter needed to achieve highest quality effluent • Higher Sludge Production than MBR. • Temperature adjustment needed. Sequence Batch Reactor

  8. MEMBRANE BIO-REACTOR (MBR) • Aeration Tank followed by an attached growth membrane. • Benefits: • Highest level of treatment up to 99% reduction in one step. • Lower sludge production than SBR • Smallest Footprint for Biological Treatment • Proven Technology Membrane Bio-Reactor

  9. MEMBRANE BIO-REACTOR (MBR) • Disadvantages: • Higher Energy Costs (Larger Blowers, Larger Pumps) • Large Equalization tank needed. • Higher capital costs • Temperature Adjustment Needed Membrane Bio-Reactor

  10. TRICKLING FILTER • Attached Growth Biological Downward Flow reactor • Benefits: • Low capital Cost • Low operation and maintenance costs • Well suited for high BOD/COD loads Wastewater Treatment w/ Biological Fixed Bed Filtration

  11. TRICKLING FILTER • Disadvantages: • 75-90% Reduction in BOD/COD levels • Temperature Adjustment needed • Regular flushing needed Wastewater Treatment w/ Trickling Filter

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