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Publications (4)9.04 Total impact

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    ABSTRACT: Kinetics of aerobic biodegradation have been investigated for twenty aromatic species using sludges collected from the aeration basin of municipal sewage treatment plants. The reproducibility of the results is tested with respect to the sludges period of collection and the wastewater treatment plant where they are taken. The comparison of kinetic constants, estimated for the investigated chemicals, allows to evaluate the reactivity effect of single groups (i.e., -OH, -CH3, -Cl, -NO2) into the aromatic structures. The search for easy structure-reactivity relationships is also attempted by means of contributing group methods.
    Chemosphere 04/2006; 62(9):1431-6. · 3.50 Impact Factor
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    ABSTRACT: This paper reports the results of experimental investigations carried out on a pilot scale phytoremediation plant for high salinity and heavy metal polluted sediment decontamination. The sediments (dredged in the Venice Lagoon) were taken from the Alles dewatering plant (located in Fusina, Venice). The results obtained after 1.5 years of experimentation confirmed the ability of some spontaneous vegetation to survive under such adverse conditions; a 30% reduction of chromium concentration in the superficial layer of vegetated beds was observed, confirmed by chromium accumulation in the biomass tissues (in particular Conyza spp.). INTRODUCTION Sediments are loose particles of sand, clay, silt and other substances that settle at the bottom of water bodies (lakes, estuaries, rivers and oceans), coming from eroding soil and from decomposing plants and animals. Most of the particles have been transported by wind, ice or water (U.S. EPA, 1999). The sediments can be considered as a heterogeneous mixture of dissimilar particles (Gulmini et al., 1996). A sediment particle is generally composed of an inorganic fraction and an organic one: the inorganic fractions are silicates (clays and not clays), carbonates, iron and manganese oxides, phosphates and sulphides, in varied chemical and crystalline forms; the organic fractions include living organisms, compounds of human origin and natural organic substances (Gulmini et al., 1996). Heavy-metal polluted sediments represent an increasing environmental problem within the harbour and inland waterways management: dredging activity is necessary for maintance shipping depth and, on the other hand, disposal in sea or landfilling is restricted more and more due to new stringent regulations. Once contaminated, sediments are removed by dredging, an alternative to open water discharge could be the use of dredged material as a soil resource offsite, avoiding the need to place the sediments in confined upland placement: recent researches indicate that contaminated dredged material can be used as substrate for wood production and the plants can enhance the remediation process (Vervaeke et al., 2001). When freshly dredged heavy metal polluted sediment comes into contact with the air, it turns acidic due to microbial oxidation processes, the heavy metals became partly soluble and dredged material poses a serious environmental risk (Loser et al., 2001). Some plants have shown to retain metals in their roots, stems and leaves; the use of green plants to remove pollutants from the environment or to render them harmless is defined phytoremediation (Raskin et al., 1997). There is a lot of interest in the use of fast growing, bushy species, which can be readily grown under a short rotation coppice system; the fast growth and regular
    BOSICON, International Conference on the Remediation of Polluted Sites, Rome Italy; 02/2006
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    ABSTRACT: The applicability of sediment slurry sequencing batch reactors (SBR) to treat Venice lagoon sediments contaminated by polycyclic aromatic hydrocarbons (PAHs) was investigated, carrying out experimental tests. The slurry, obtained mixing tap water and contaminated sediments with 17.1 mg kg(-1) TS total PAHs content, was loaded to a 8l lab-scale completely stirred reactor, operated as a sequencing batch reactor. Oxygen uptake rate exerted by the slurry, measured by means of a DO-stat titrator, was used to monitor the in-reactor biological activity and to select the optimal operating conditions for the sediment slurry SBR. The PAHs removal efficiency was evaluated in different operating conditions, obtained changing the hydraulic retention time (HRT) of the lab-scale reactor and adding an external carbon source to the slurry. HRT values used during the experiments are 98, 70 and 35 days, whereas the carbon source was added in order to evaluate its effect on the biological activity. The results have shown a stable degradation of PAHs, with a removal efficiency close to 55%, not dependent on the addition of carbon source and the tested HRTs.
    Journal of Hazardous Materials 04/2005; 119(1-3):159-66. · 4.33 Impact Factor
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    ABSTRACT: The kinetics of aerobic biodegradation were studied for 20 aromatic species by using sludges taken from a municipal sewage treatment plant. The reproducibility of the results is tested with respect to the period of collection of the sludges and the wastewater treatment plant where they were taken. The comparison of kinetic constants estimated for investigated chemicals allows evaluation of the effect on the reactivity due to the presence of single groups (i.e. -OH, -CH3, -Cl, -NO2) into the aromatic structures. The search for easy structure-reactivity relations is also attempted by using some group contributing methods.
    Water Science & Technology 02/2005; 52(8):257-64. · 1.21 Impact Factor