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Nutrient removal processes for low strength wastewater.

H S Shin1, M G Park, J Y Jung

  • 1Dept. of Civil Engineering, Korea Advanced Institute of Science & Technology, Taejon.

Environmental Technology
|September 20, 2001
PubMed
Summary
This summary is machine-generated.

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The Endogenous Nitrate Respiration (ENR) process enhances nutrient removal from low-strength wastewater by utilizing return sludge as a carbon source. This method proves more effective than conventional processes for denitrification and phosphorus removal.

Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Microbial Nutrient Removal

Background:

  • Conventional biological nutrient removal (BNR) processes struggle with low-strength wastewater due to insufficient organic carbon.
  • Denitrification and phosphorus release are key challenges in treating such wastewater.

Purpose of the Study:

  • To develop and evaluate the Endogenous Nitrate Respiration (ENR) process for enhanced nutrient removal from low-strength wastewater.
  • To compare the efficiency of ENR with conventional A2/O and MUCT processes.

Main Methods:

  • The ENR process was developed, utilizing degraded return sludge as an internal carbon source.
  • Performance was compared against A2/O (Anaerobic/Anoxic/Aerobic) and MUCT (Modified University of Cape Town) processes.

Related Experiment Videos

  • Key metrics included specific phosphorus release rates and effluent nitrate concentrations.

    • Main Results:

    • ENR exhibited higher specific phosphorus release rates (2.6 mg PO1-P g1 MLVSS-h) compared to A2/O (0.8) and MUCT (2.3).
    • ENR achieved lower effluent nitrate concentrations, reducing nitrate by 25% compared to A2/O and 10% compared to MUCT.
    • Phosphorus removal efficiencies increased by 15% (vs. A2/O) and 6% (vs. MUCT) with the ENR process.

    Conclusions:

    • The ENR process is an effective and economical alternative for nutrient removal from low-strength wastewater.
    • Utilizing endogenous carbon sources significantly improves denitrification and phosphorus removal.
    • ENR offers a promising solution for upgrading existing wastewater treatment facilities.