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Related Experiment Videos

Simultaneous nitrification and p-cresol oxidation in a nitrifying sequencing batch reactor.

A-C Texier1, J Gomez

  • 1Universidad Autónoma Metropolitana-Iztapalapa, Div. CBS, Departamento de Biotecnología, Av. San Rafael Atlixco 186, Col. Vicentina, C.P. 09340, México, DF.

Water Research
|November 28, 2006
PubMed
Summary

Nitrifying sludge in a sequencing batch reactor (SBR) can effectively remove p-cresol and ammonium, even at high concentrations. This process enhances microbial efficiency and sludge settleability over time.

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Area of Science:

  • Environmental Microbiology
  • Biotechnology
  • Wastewater Treatment

Background:

  • p-Cresol is a common industrial pollutant that can inhibit nitrification processes.
  • Nitrifying sludge requires evaluation for its tolerance and kinetic behavior when exposed to organic contaminants.
  • Sequencing batch reactors (SBRs) are versatile systems for biological wastewater treatment.

Purpose of the Study:

  • To assess the tolerance, kinetic behavior, and oxidizing capacity of nitrifying sludge exposed to varying p-cresol concentrations.
  • To evaluate the simultaneous removal of ammonium and p-cresol in a nitrifying SBR.
  • To understand the long-term effects of p-cresol exposure on nitrification and sludge characteristics.

Main Methods:

  • Operation of a sequencing batch reactor (SBR) with nitrifying sludge.

Related Experiment Videos

  • Exposure of sludge to initial p-cresol concentrations ranging from 25-150 mg/L.
  • Feeding the SBR with 200 mg NH(4)(+)-N/L and monitoring ammonium oxidation and p-cresol consumption.
  • Analysis of specific rates for ammonium oxidation, nitrate formation, and organic carbon consumption.
  • Assessment of microbial growth rate and sludge settleability (Sludge Volume Index).

    • Main Results:

    • The nitrifying SBR successfully operated up to 300 mg/L of p-cresol, achieving complete ammonium oxidation and total p-cresol consumption.
    • p-Cresol significantly inhibited ammonium consumption rates, indicating pathway inhibition.
    • After 7 months, specific rates were 0.6g NH(4)(+)-N/g protein-N/h, 0.3g NO(3)(-)-N/g protein-N/h, and 0.24g TOC/g protein-N/h.
    • Microbial growth rate remained low (max 12.2 mg protein-N/L/d) with good sludge settleability (SVI < 21 ml/g).
    • p-Cresol oxidation accelerated over cycles, and nitrification inhibition decreased with continued operation.

    Conclusions:

    • Nitrifying sludge demonstrates significant tolerance and oxidizing ability towards p-cresol, enabling simultaneous pollutant removal and nitrification.
    • Long-term operation in an SBR improves the efficiency of p-cresol degradation and reduces nitrification inhibition.
    • The study highlights the potential of nitrifying SBRs for treating wastewater contaminated with p-cresol and ammonium.