Batch Nitrifying Cultures in Presence of Mixtures of Benzene, Toluene, and m-Xylene

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In this Subject: <a title="Hydraulic & Environmental Engineering" href="/content/subcat?j_subject=189&j_availability=">Hydraulic & Environmental Engineering
By this author: Zepeda, A. ;&nbsp; Texier, A.C. ;&nbsp; Gomez, J.

Authors: Zepeda, A.; Texier, A.C.; Gomez, J.

Source: Environmental Technology, Volume 28, Number 3, March 2007 , pp. 355-360(6)

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Abstract:

Benzene, toluene, and m-xylene compounds in individual (5.0 ± 0.5 mg C l⁻¹) and mixed solutions (2.5 ± 0.2 mg C l⁻¹ for each one) in nitrifying batch cultures induced a decrease in the specific rates of NH₄⁺ consumption (81 ± 6%) and NO₃⁻ production (39-79%). However, after 24 h, ammonium consumption efficiency and conversion of consumed NH₄⁺-N into NO₃⁻-N were close to 100% and there was no significant accumulation of nitrite in the medium. After 24 h, no aromatic intermediate was detected in the cultures and 50% of the mixed compounds was converted to acetate. The following order of biotransformation was found: m-xylene > toluene > benzene. Transformation rate of m-xylene was 0.051 ± 0.005 g C (g protein-N h)⁻¹ in individual and mixed solutions. When m-xylene was added, benzene was oxidized at a faster rate (0.051 ± 0.005 g C (g protein-N h)⁻¹) whereas toluene at a slower rate (0.012 ± 0.002 g C (g protein-N h)⁻¹).

Keywords: BIOTRANSFORMATION; BTX COMPOUNDS; INHIBITION; KINETICS; NITRIFICATION

Document Type: Research article

Publication date: 2007-03-01