Activated carbon production and phosphorous recovery from industrial sludge by application of an integrated thermo-chemical treatment: PRESENTATION ONLY

Proceedings

Activated carbon production and phosphorous recovery from industrial sludge by application of an integrated thermo-chemical treatment: PRESENTATION ONLY

Andrea Salimbeni, RE-CORD, Italy; University of Florence, Italy,
(free)

Our study aimed to assess the application of an integrated thermochemical process to two different industrial sludges for the production of activated carbon and for phosphorous recovery.

• The application of chemical leaching by HNO₃ to the char produced by sludge slow pyrolysis was effective on char demineralisation (85 and 88 %) and on the extraction of phosphorous (100 %), calcium (100 %), potash (95 %), aluminium (87 %), iron (100 %).

• By chemical precipitation of the liquid phase from chemical leaching by KOH, almost100% of phosphorous was recovered in the form of precipitate in both tests. Both precipitates have a high calcium, magnesium an potash content. The precipitate from the food industry sludge shows a high iron and aluminium content too.

• The activation process by CO₂ applied to the leached chars led to a relevant surface area increase, with the maximum value of 417 m²/g reached.

• The classification of the activated materials in the Van Krevelen diagram is comparable to anthracite.1C

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