Optimization and enhancement of soil bioremediation by composting using the experimental design technique |
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Authors: | Tahseen Sayara Montserrat Sarrà Antoni Sánchez |
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Institution: | 1.Department of Chemical Engineering, Escola Tècnica Superior d’Enginyeria, Edifici Q,Universitat Autònoma de Barcelona,Barcelona,Spain |
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Abstract: | 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. |
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