In-vessel composting-bioremediation of aged coal tar soil: effect of temperature and soil/green waste amendment ratio. | Antizar-Ladislao, B., Lopez-Real, J., Beck, A. J. | Environment International

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Title: In-vessel composting-bioremediation of aged coal tar soil: effect of temperature and soil/green waste amendment ratio.
Personal Authors: Antizar-Ladislao, B., Lopez-Real, J., Beck, A. J.
Author Affiliation: Imperial College London, Wye Campus, Wye, Ashford, Kent TN25 5AH, UK.
Editors: Kalogerakis, N., Alvarez, P., Psillakis, E.
Document Title: Environment International

Abstract:

The biodegradation of 16 United States Environmental Protection Agency (USEPA)-listed polycyclic aromatic hydrocarbons (PAHs) present in contaminated soil from a manufactured gas plant site was investigated using laboratory-scale in-vessel composting-bioremediation reactors over 8 weeks. The influence of temperature (T, 38, 55, and 70°C) and soil/green waste ratio (S:GW, 0.6:1, 0.7:1, 0.8:1, and 0.9:1) was investigated. A comparative study using a temperature profile during in-vessel composting-bioremediation to meet current regulatory requirements was also investigated. Temperature and amendment ratio were found to be important operating parameters for PAH removal for in-vessel composting-bioremediation of aged coal tar-contaminated soil. After 8 weeks of continuous treatment, the highest removal of 16 USEPA PAHs was observed at T=38°C and S:GW=0.8:1 (75.2%). Lower removal of 16 USEPA PAHs was observed for temperature profile treatment (60.8%). We recommend that when conventional composting processes using temperature profiles to meet regulatory requirements for pathogen control need to be used, these should start with a prolonged mesophilic stage (6 weeks in this investigation) followed by thermophilic, cooling, and maturation stages.

Publisher: Elsevier

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