Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 502, Issue -, Pages 699-705Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2014.09.052
Keywords
Contaminated soil; Mineralisation; Diuron; Hydroxypropyl-beta-cyclodextrin; Bioremediation; Compost
Categories
Funding
- Spanish Research Council (CSIC)
- Spanish Ministry of Science and Innovation - Fondo Europeo de Desarrollo Regional, FEDER [CTM2009-07335]
- Junta de Andalucia [RNM 894]
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Diuron desorption and mineralisation were studied on an amended and artificially contaminated soil. The amendments used comprised two different composted organic residues i.e., sewage sludge (SS) mixed with pruning wastes, and urban solid residues (USR), and two different solutions (with inorganic salts as the micronutrients and hydroxypropyl-S-cyclodextrin (HPBCD)). After applying micronutrients to activate the soil flora, 15.5% mineralisation could be reached after 150 days, indicating that the soil has a potential capacity to mineralise the herbicide through biostimulation-assisted attenuation. Diuron mineralisation was also improved when HPBCD solutions were applied. Indeed, the extent of herbicide mineralisation reached 29.7% with this application. Moreover, both the lag phase and the half-life time (DT50) were reduced to 33 and 1778 days, respectively, relative to the application of just micronutrients (i.e., 39 and 6297 days, respectively). Organic amendments were also applied (i.e., USR and SS) on the contaminated soil: it was found that the diuron mineralisation rate was improved as the amendment concentration increased. The joint application of all treatments investigated at the best conditions tested was conducted to obtain the best diuron mineralisation results. The micronutrient amendment plus 4% USR or SS amendment plus HPBCD solution (10-fold diuron initially spiked) caused an extent of diuron mineralisation 33.2 or 465%, respectively. (C) 2014 Elsevier B.V. All rights reserved.
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