1,738 research outputs found
Trattamento di terreni contaminati da idrocarburi mediante biopile. Monitoraggio di un impianto alla scala reale: una ricerca sulla piattaforma che tratta terreni contaminati da idrocarburi petroliferi
No full textRanking sewage sludge management strategies by means of Decision Support Systems: A case study
No full textEffectiveness in chlorite removal by two activated carbons under different working conditions: a laboratory study
No full textActivated carbon is used in many drinking water facilities because it can remove a broad spectrum of
contaminants (e.g., herbicides, pesticides, heavy metals, etc.) or to replace anthracite coal in dual
media filters. In recent years, liquid chlorine has been substituted by chlorine dioxide (ClO2) because,
for instance, it can remove natural organic matter in raw water without formation of harmful
disinfection by-products. Interest in chlorine dioxide is due to formation of chlorite (ClO
2 ), which can
be potentially toxic for humans. In this study, the authors investigated the applicability of two
activated carbons coming from different matrices (coconuts and bituminous) as technology for
chlorite removal. The activated carbons were tested at different conditions (virgin and pre-loaded
with some substances) in order to simulate full-scale working situations, and their Freundlich
isotherms were determined. The results show a good affinity of virgin carbons in chlorite removal
(about 80%), but the pre-loading significantly affected the efficiency of the chlorite removal process,
reducing it to only 19%. An investigation into the main removal mechanism used by the carbons for
chlorite removal was also done. Results show that activated carbons used both reduction and
adsorption processes
Towards energy self-sufficiency and integral material recovery in waste water treatment plants: Assessment of upgrading options
No full textTrattamento di terreni contaminati da idrocarburi mediante biopile: monitoraggio di un impianto alla scala reale
No full text
Reuse of hydrocarbon-contaminated sludge from soil washing process: issues and perspectives
No full textSoil washing is a remediation technology commonly used to treat soil contaminated by total petroleum hydrocarbons (TPHs) (Seyed Razavi et al., 2012). Nowadays in Italy there are about ten plants, mainly placed in the north of the country. After treatment, coarse materials (i.e. gravel and sand) are cleaned and can be reused, e.g. as aggregate for concrete production; contaminants are concentrated in the filter-pressed sludge containing fine grains (i.e silt and clay), which is usually landfilled.
This paper analyses different alternatives for sludge reuse at an industrial scale in Italy; the main normative and technical constraints are presented and discussed. In addition, the preliminary results of a lab-scale experimentation aimed at investigating the treatability of soil washing residues by wet oxidation are presented.
The reuse and valorisation of soil washing originated sludge is desirable not only from the economic point of view but also because Italian and European legislation put waste recycling as a priority. Several tens of thousands of tons of sludge are produced and landfilled in Italy every year; they represent materials which could be exploited at industrial scale in place of virgin silt and clay to produce stabilised soil for road construction or bricks in brick works. Sludge reuse for cement production is possible, too, but it is probably more expensive.
The use of raw sludge produced in soil washing plants implies a potential risk of environmental contamination therefore the basic condition for sludge recovery and reuse is its decontamination, which can be theoretically obtained by thermal desorption, solvent extraction or chemical oxidation. Wet oxidation tests executed by the authors indicate that such a process is potentially applicable. 98 % removal efficiency of TPHs was obtained in a lab-scale reactor setting temperature, treatment time and initial oxygen pressure to 250 °C, 30 min and 20 atm, respectively. Further tests will be carried out in order to identify the most favourable and cheapest treatment conditions
Applicabilità dell’ossidazione a umido quale post-trattamento per la decontaminazione della frazione limo-argillosa derivante da soil washing
No full textConfronto tra due impianti di depurazione CAS e MBR: aspetti tecnici, economici e ambientali
No full textMethodology for technical and economic assessment of advanced routes for sludge processing and disposal
No full textIn order to meet the environmental legislative framework in force in Europe and reduce sludge processing and disposal costs, several sludge treatment technologies and management strategies have been proposed in the last two decades. The evaluation of their technical and economic suitability, case by case, may be a challenge, since many aspects are involved, so that a robust decision support system should be used. Within the ROUTES project (founded within the EU Seventh Framework Programme), the authors have developed an assessment procedure which allows rating several technical factors (such as system reliability, complexity, safety aspects, modularity, etc.) and estimating capital and operating costs, in case a plant is being upgraded. The comparison between the original (reference) plant and the modified configuration informs about technical hot spots (which are expressed by a traffic light-type colour code) and cost gaps resulting from the implementation of the new solution
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