This study investigated the microbial degradation of 14C-labelled hexadecane,
octacosane, phenanthrene and pyrene and considered how degradation might be
optimised in three genuinely hydrocarbon contaminated soils from former
petroleum refinery sites. Hydrocarbon mineralisation by the indigenous microbial
community was monitored over 23 d. Hydrocarbon mineralisation enhancement by
nutrient amendment (biostimulation), hydrocarbon degrader addition
(bioaugmentation) and combined nutrient and degrader amendment, was also
explored. The ability of indigenous soil microflora to mineralise 14C-target
hydrocarbons was appreciable; ≥ 16% mineralised in all soils. Generally,
addition of nutrients or degraders increased the rates and extents of
mineralisation of 14C-hydrocarbons. However, the addition of nutrients and
degraders in combination had a negative effect upon 14C-octacosane
mineralisation and resulted in lower extents of mineralisation in the three
soils. In general, the rates and extents of mineralisation will be dependent
upon treatment type, nature of the contamination and adaptation of the ingenious
microbial communi
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