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Ritratto Tecnico del progetto Green Site


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Intervento di Ruggero Corazza, Alles SpA
Conferenza Finale Progetto GREEN SITE: “Supercritical fluid technologies for river and sea dredge sediment remediation”. LIFE 10 ENV/IT/343.
Venezia, 13 dicembre 2013

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Ritratto Tecnico del progetto Green Site

  1. 1. Project GREEN SITE “Supercritical fluid technologies for river and sea dredge sediment remediation” – LIFE 10 ENV/IT/343 – Ing. Ruggero Corazza – ALLES S.p.A.
  2. 2. What’s a supercritical fluid Definition: Super-critical state: in conditions over their critical temperature and pressure, fluids and their behaviours become partly like liquids (p.e. density) and partly like gas (p.e. propagation). Water and Carbon dioxide, in supercritical conditions, are able to dissolve organic compounds. Sub-critical state: in conditions of temperature and/or pressure a little below its critical ones, only some properties of a supercritical fluid have been acquired.
  3. 3. 1st Phase: Extraction of the pollutants using supercritical CO2 and subcritical H2O Inlet: Polluted sediment, H2O, CO2 Outlet: H2O, CO2 , pollutants cleaned sediment Process Temperature 250°C Process Pressure 300 bar CO2 has Tcritical 31°C, Pcritical71 bar H2O has Tcritical 374°C, Pcritical220 bar and
  4. 4. 2nd Phase: Supercritical Oxidation of the pollutants CO2 CO2 Inlet: H2O + Pollutants extracted in Phase 1, air 300 bar Outlet: CO2, H2O and salts, heat Process Temperature 800°C Process Pressure 300 bar
  5. 5. Extraction Reactor (left), Oxidation Reactor (right)
  6. 6. Project targets • Over 90% abatement of organic solvents. • Over 95% abatement of washing liquor. • Extraction times for the target compounds: 60’ – 90’ (max 5kg) Oxidation times of 1 l of the target compounds: 1’ – 5’ • Absence of any residual solvents and micro-organisms in the dredged sediments.
  7. 7. Layout of the plant (Extraction + Oxidation)
  8. 8. Green Site’s plant front view
  9. 9. Green Site’s plant back and side view
  10. 10. Extraction layout during a test
  11. 11. Fase di Estrazione:test running Extraction phase: Esecuzione During the testing activity 2 kinds of samples have been used with 2 different concentration levels of contaminants: one with 50mg/kg and one with 100mg/kg. For each test about 2 kg of sediments have been treated. Carbon Dioxide, used for extraction, has been re-used every time, while the liquid phase exiting from the separators has been collected and analized.
  12. 12. Oxidation layout during a test
  13. 13. Oxidation phase: inlets Oxidation tests have been carried out introducing, at first, a liquid mixture of water and isopropyl alcohol to bring the reactor to the optimum process conditions; then, the first mixture has been replaced by a mixture of water and hydrocarbons (polluttants)
  14. 14. Oxidation phase: test running For the oxidation tests we’ve used a mixture of water and aboput 7% of hydrocarbons, in fact we wanted to verify the oxidation reaction using as fule, only hydrocarbons. So, we needed to concentrate the liquid phase obtained from the extraction tests separing some cleaned water from the more concentrated mixture. In case of an industrial scale plant, for this concentration, we are thinking about a system based on a union of floating systems and filtration on membrane. The performed oxidation tests have shown the ignition of an hydrotermal flame at the expected conditions (400°C and 300 bar) and its stable maintenance (about at 800°C and 300 bar) both with the water and isopropyl alcohol mixture and with the water and hydrocarbons mixture.
  15. 15. THANK YOU FOR YOUR KIND ATTENTION For other informations: e-mail