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Titolo:
Biodegradation of PAHs in aggregates of a low permeability soil
Autore:
Nocentini, M; Pinelli, D;
Indirizzi:
Univ Bologna, Dept Chem Min & Environm Engn, I-40136 Bologna, Italy Univ Bologna Bologna Italy I-40136 Environm Engn, I-40136 Bologna, Italy
Titolo Testata:
SOIL & SEDIMENT CONTAMINATION
fascicolo: 2, volume: 10, anno: 2001,
pagine: 211 - 226
SICI:
1532-0383(200107)10:2<211:BOPIAO>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CREOSOTE-CONTAMINATED MATERIALS; BIOLOGICAL TREATMENT PROCESSES; BENCH-SCALE EVALUATION; PHASE BIOREMEDIATION; SURFACTANTS; PHENANTHRENE; DEGRADATION; REMEDIATION; DESORPTION; SYSTEMS;
Keywords:
bioremediation; polycyclic aromatic hydrocarbons; low permeability soil; soil aggregates; oxygen diffusion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Nocentini, M Univ Bologna, Dept Chem Min & Environm Engn, Lab, Via Terracini 34, I-40131 Bologna, Italy Univ Bologna Via Terracini 34 Bologna Italy I-40131 a, Italy
Citazione:
M. Nocentini e D. Pinelli, "Biodegradation of PAHs in aggregates of a low permeability soil", SOIL SEDIM, 10(2), 2001, pp. 211-226

Abstract

In the bioremediation of low-permeability soils, pollutant and, especially, the oxygen bioavailability are often the rate limiting steps. In cases when a biopile treatment can represent an applicable technique, pretreatment of the excavated soil is often necessary to attain an adequate air-filled porosity in the soil and to avoid the presence of large soil aggregates. The present work was performed to evaluate the influence of soil aggregatesize in the bioremediation of a silt-clay type soil contaminated by PAHs. Microcosms were arranged with spherical soil aggregates of different diameter in near water-saturation conditions, concentration of two and three aromatic ring PAHs, total biomass, and respiration rates were monitored. PAH concentration profiles inside the particles were also obtained. A simple and quick way to estimate the critical dimension of the soil aggregates was developed based on the evaluation of an oxygen penetration depth, that is, thedistance from the external surface to the aggregate core beyond which oxygen concentration is practically zero. A very different time course of PAHs consumption was found in the externallayer and the inner core of the aggregates as well as in aggregates of different dimensions. The results suggest that only the 3 mm external layer ofthe sphere is not limited by oxygen diffusion.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 11:25:30