Raffaele Cesaro

University of Naples Federico II, Napoli, Campania, Italy

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Publications (6)12.26 Total impact

  • Raffaele Cesaro · Giovanni Esposito
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    ABSTRACT: The present research deals with the optimization of the operating parameters (cathode replacement time, hydraulic retention time, current intensity and pH) of an electrochemical process aimed at the regeneration of a soil washing EDTA solution used for heavy metal extraction from a natural contaminated soil (excavated from Bellolampo, Palermo, Italy), which was vastly polluted with Cu (59 261.0 mg kg(-1)), Pb (14 178.1 mg kg(-1)) and Zn (14 084.9 mg kg(-1)). The electrolytic regeneration of the exhausted washing solution was performed in a laboratory scale electrolytic cell with 50 ml each cathodic and anodic chambers divided by a cation exchange membrane. Experiments II and III showed maximum Cu and Zn removal efficiencies from the EDTA solution, of 99.2+/-0.2 and 31.5+/-9.3%, respectively, when a current intensity of 0.25 A and a hydraulic retention time of 60 min were applied to the electrolytic cell, while the maximum Pb removal efficiency of 70.9+/-4.6% was obtained with a current intensity of 1.25 A and a hydraulic retention time of 60 min. During Experiment I the overall heavy metals removal efficiency was stable and close to 90% up to 20 h, while decreased to values lower than 80% after 40 h, indicating the occurrence of a significant saturation of the cathode graphite bed between 20 and 40 h. The capability of the regenerated EDTA solution to treat heavy metals polluted soils was tested in further experiments applying both a single and a multi-step washing treatment procedure. In particular, the latter showed the feasibility to increase heavy metal soil extractions over subsequent washing steps with Cu, Pb and Zn total removal efficiencies of 52.6, 100.0 and 41.3%, respectively.
    No preview · Article · Mar 2009 · Journal of Environmental Monitoring
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    ABSTRACT: A novel approach, based on chitosan heavy-metal sequestrating ability, is proposed for chromium(III) removal from spent tanning liquor. Experimental results, obtained at lab-scale using real wastewater, are presented and discussed. Resulting efficiencies are extremely high, and strongly dependent on chitosan dose and pH value. Comparative analyses with other polysaccharides is also carried out showing that amine groups are more efficient than carboxyl and sulphate ones. Chromium recovery from sorption complexes and chitosan regeneration is finally proposed to optimize the whole process.
    No preview · Article · Feb 2008 · Water Science & Technology
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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.
    No preview · Article · Apr 2006 · Chemosphere
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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
    Full-text · Conference Paper · Feb 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.
    No preview · Article · Apr 2005 · Journal of Hazardous Materials
  • R Andreozzi · R Cesaro · A Gonnella · R Marotta · F Pirozzi
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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.
    No preview · Article · Feb 2005 · Water Science & Technology