Effects of mixing low amounts of orange peel (Citrus reticulata) with hydrocarbon-contaminated soil in solid culture to promote remediation.
The effect of mixing low amounts of orange peel (Citrus reticulata) with a soil contaminated with hydrocarbons (58,000 mg kg(-1) soil) for promoting the soil remediation in solid culture was studied. The experimental design was established in solid culture at soil/orange (Citrus reticulata) peel ratios of 100:0, 98:2, 96:4, 94:6 and 92:8, at 30% humidity and a C:N:P ratio of 100:10:1, for 15, 60 and 90 days, respectively. The total petroleum hydrocarbons (TPHs) decreased significantly (69%) after 15 days in the treatment with a soil to orange peel ratio of 92:8. Furthermore, in this treatment bacterial counts increased from 17 to 20 ln CFU (2.6 x 10(6) to 5 x 10(8)), while the fungal count was 11 ln CFU (6.5 x 10(4)) at initial and final time of treatment. An increase in microbial respiration activity and TPH removal (69%) was observed at other soil/orange peel ratios after 60 days when moisture content and nutrients were adjusted; however, N and P were not consumed at a great extent.
Roldán-Martín
A
A
Depto. de Biotecnología y Bioingeniería, Centro de Investigación y de Estudios Avanzados del IPN, Col. San Pedro Zacatenco, México.
Esparza-García
F
F
Calva-Calva
G
G
Rodríguez-Vázquez
R
R
D001673:Biodegradation, Environmental; D032084:Citrus sinensis; D015169:Colony Count, Microbial; D005069:Evaluation Studies as Topic; D005638:Fruit; D006838:Hydrocarbons / Q000032:analysis*; D009584:Nitrogen / Q000378:metabolism; D010578:Petroleum; D010758:Phosphorus / Q000378:metabolism; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis*; D013997:Time Factors
D006838:Hydrocarbons; D010578:Petroleum; D012989:Soil Pollutants; D010758:Phosphorus; D009584:Nitrogen