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Bioaugmentation with novel microbial formula vs. natural attenuation of a long-term mixed contaminated soil : treatability studies in solid- and slurry-phase microcosms

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dc.contributor.authorKuppusamy, S.
dc.contributor.authorThavamani, P.
dc.contributor.authorMegharaj, M.
dc.contributor.authorNaidu, R.
dc.date.issued2015
dc.description.abstractTreatability studies in real contaminated soils are essential to predict the feasibility of microbial consortium augmentation for field-scale bioremediation of contaminated sites. In this study, the biodegradation of a mixture of seven PAHs in a manufactured gas plant (MGP) soil contaminated with 3967 mg kg-1 of total PAHs using novel acid-, metal-tolerant, N-fixing, P-solubilizing, and biosurfactant-producing LMW and HMW PAH-degrading bacterial combinations as inoculums was compared in slurry- and solid-phase microcosms over natural attenuation. Bioaugmentation of 5 % of bacterial consortia A and N in slurry- and solid-phase systems enhanced 4.6-5.7 and 9.3-10.7 % of total PAH degradation, respectively, over natural attenuation. Occurrence of 62.7-88 % of PAH biodegradation during natural attenuation in soil and slurry illustrated the accelerated rate of intrinsic metabolic activity of the autochthonous microbial community in the selected MGP soil. Monitoring of the total microbial activity and population of PAH degraders revealed that the observed biodegradation trend in MGP soil resulted from microbial mineralization. In the slurry, higher biodegradation rate constant (k) and lower half-life values (t 1/2) was observed during bioaugmentation with consortium N, highlighting the use of bioaugmentation in bioslurries/bioreactor to achieve rapid and efficient bioremediation compared to that of a static solid system. In general, natural attenuation was on par with bioaugmentation. Hence, depending on the type of soil, natural attenuation might outweigh bioaugmentation and a careful investigation using laboratory treatability studies are highly recommended before the upscale of a developed bioremediation strategy to field level.
dc.identifier.citationWater, Air, and Soil Pollution, 2015; 227(1):1-15
dc.identifier.doi10.1007/s11270-015-2709-7
dc.identifier.issn0049-6979
dc.identifier.issn1573-2932
dc.identifier.urihttps://hdl.handle.net/11541.2/119117
dc.language.isoen
dc.publisherSpringer
dc.relation.fundingAustralian Government International Postgraduate Research Scholarship (IPRS)
dc.relation.fundingUniversity of South Australia International Postgraduate Research Scholarship (IPRS)
dc.relation.fundingCooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE) International Postgraduate Research Scholarship (IPRS)
dc.relation.fundingCRC CARE top-up fellowship
dc.rightsCopyright 2015 Springer International Publishing Switzerland.
dc.source.urihttps://doi.org/10.1007/s11270-015-2709-7
dc.subjectmanufactured gas plant (MGP)
dc.subjectsoil bioremediation
dc.subjectpolycyclic aromatic hydrocarbons (PAHs)
dc.subjectheavy metals
dc.subjectnatural attenuation
dc.subjectbacterial consortium
dc.subjectbioaugmentation
dc.titleBioaugmentation with novel microbial formula vs. natural attenuation of a long-term mixed contaminated soil : treatability studies in solid- and slurry-phase microcosms
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9916069307801831

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