Journal
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
Volume 15, Issue 9, Pages 877-888Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15226514.2012.760520
Keywords
petroleum sludge; total petroleum hydrocarbon; degradation; vegetation; Cyperus rotundus; Cyperus brevifolius
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Funding
- OIL INDIA LIMITED, Duliajan, Assam (India)
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The aim of this study was to degrade total petroleum hydrocarbon (TPH) in a petroleum sludge contaminated site (initial TPH concentration of 65,00075,000mg.kg1) with two native sedge species namely Cyperus rotundus (Linn.) and Cyperus brevifolius (Rottb.) Hassk. Fertilized and unfertilized treatments were maintained separately to record the influence of fertilizer in TPH degradation. The average biomass production (twenty plants from each treatment) of C. rotundus was 345.5g and that of C. brevifolius was 250.6g in fertilized soil during 360days. Decrease in soil TPH concentration was higher in fertilized soil (75% for C. rotundus and 64% for C. brevifolius) than in unfertilized soil (36% for C. rotundus and 32% for C. brevifolius). In unvegetated treatments, decrease in soil TPH concentration in fertilized (12%) and unfertilized soil (8%) can be attributed to natural attenuation and microbial degradation. TPH accumulation in roots and shoots was significantly higher in fertilized soil in comparison to unfertilized soils (p < 0.05). Most probable number (MPN) in planted treatments was significantly higher than in unplanted treatments (p < 0.05).
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