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Related Experiment Videos

Low effluent nutrient technologies for wastewater treatment.

K R Pagilla1, M Urgun-Demirtas, R Ramani

  • 1Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 12, 2006
PubMed
Summary

New wastewater treatment technologies help meet strict nutrient limits for nitrogen and phosphorus. Challenges remain in removing dissolved organic nitrogen and optimizing phosphorus removal due to alkalinity and BOD issues.

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Area of Science:

  • Environmental Engineering
  • Water Quality Management
  • Wastewater Treatment Technology

Background:

  • Stringent nutrient criteria for nitrogen (N) and phosphorus (P) from the USEPA (2001) significantly impact the water pollution control industry.
  • Existing wastewater treatment plants (WWTPs) face challenges in meeting these new, lower effluent limits for total nitrogen (TN) and total phosphorus (TP).

Purpose of the Study:

  • To identify and update findings on successful technologies for achieving low TN and TP effluents at existing WWTPs.
  • To summarize key challenges and research needs for further improving nutrient removal technologies.

Main Methods:

  • Worldwide literature search and plant data collection to identify WWTPs consistently achieving <5 mg TN/L and <0.5 mg TP/L.
  • Analysis of technological gaps and research requirements for advanced nutrient removal.

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Main Results:

  • Several technologies are successfully implemented in WWTPs to achieve low TN and TP effluent levels.
  • Dissolved and colloidal organic nitrogen present major challenges for very low TN removal.
  • Achieving very low TP effluents faces technical and economic hurdles including alkalinity deficiency, high chemical use, increased sludge production, and insufficient influent BOD for biological P uptake.

Conclusions:

  • Successful technologies exist for meeting stringent nutrient criteria, but further advancements are needed.
  • Addressing challenges related to organic nitrogen and phosphorus removal is critical for future wastewater treatment optimization.