Abstract
In this paper, the effect of nitrogen addition on the aerobic bioremediation of a diesel-contaminated soil was studied. Soil was artificially contaminated with diesel at an initial 2% concentration (on a dry soil basis). Nitrogen was added as NH4Cl in a single load at the start of the experiment at concentration levels of 0, 100, 250, 500, 1,000, and 2,000 mg N/dry kg soil, and uncontaminated and unamended soil O2 consumptions were studied. Diesel degradation was indirectly studied via measurements of O2 consumption and CO2 production, using manometric respirometers. Results showed that the 250 mg N/dry kg concentration resulted in the highest O2 consumption among all runs, whereas O2 consumption was reduced by N additions greater than 500 mg N/dry kg. Zero to 0.6 order degradation kinetics appeared to prevail, as was calculated via the oxygen consumption rates. A theoretical biochemical reaction for diesel degradation was developed, based on measurement of the final diesel concentration in one of the runs. According to the stoichiometry, the optimal N requirements to allow complete diesel degradation should be approximately 0.15 g N/g diesel degraded or 1,400 mg N/dry kg of soil, based on the initial diesel concentration used in this study. This implies that N should be added in incremental loads.
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Komilis, D.P., Vrohidou, AE.K. & Voudrias, E.A. Kinetics of Aerobic Bioremediation of a Diesel-Contaminated Sandy Soil: Effect of Nitrogen Addition. Water Air Soil Pollut 208, 193–208 (2010). https://doi.org/10.1007/s11270-009-0159-9
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DOI: https://doi.org/10.1007/s11270-009-0159-9