Optimization and enhancement of soil bioremediation by composting using the experimental design technique.
The objective of this study was the application of the experimental design technique to optimize the conditions for the bioremediation of contaminated soil by means of composting. A low-cost material such as compost from the Organic Fraction of Municipal Solid Waste as amendment and pyrene as model pollutant were used. The effect of three factors was considered: pollutant concentration (0.1-2 g/kg), soil:compost mixing ratio (1:0.5-1:2 w/w) and compost stability measured as respiration index (0.78, 2.69 and 4.52 mg O2 g(-1) Organic Matter h(-1)). Stable compost permitted to achieve an almost complete degradation of pyrene in a short time (10 days). Results indicated that compost stability is a key parameter to optimize PAHs biodegradation. A factor analysis indicated that the optimal conditions for bioremediation after 10, 20 and 30 days of process were (1.4, 0.78, 1:1.4), (1.4, 2.18. 1:1.3) and (1.3, 2.18, 1:1.3) for concentration (g/kg), compost stability (mg O2 g(-1) Organic Matter h(-1)) and soil:compost mixing ratio, respectively.
Sayara
Tahseen
T
Department of Chemical Engineering, Escola Tècnica Superior d'Enginyeria, Edifici Q, Universitat Autònoma de Barcelona, Bellaterra, Cerdanyola, 08193, Barcelona, Spain.
Sarrà
Montserrat
M
Sánchez
Antoni
A
D001673:Biodegradation, Environmental / Q000187:drug effects; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007700:Kinetics; D008956:Models, Chemical; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000378:metabolism; D011721:Pyrenes / Q000032:analysis / Q000378:metabolism; D012037:Refuse Disposal / Q000379:methods; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*
D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D012987:Soil; D012989:Soil Pollutants; C030984:pyrene