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Adsorption of phenols from olive oil mill wastewater as well as and from a simulated city wastewater liquid on activated Greek lignites

Pasadakis Nikos, Triantafyllou Georgios, Papanikolaou C., Foscolos A.E.

Πλήρης Εγγραφή

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Περίληψη

Organic petrology and detailed physicochemical properties has been undertaken on twenty six Greek lowrank coals (peat, peaty lignites, lignites of both matrix and xylite-rich lithotypes, and sub-bituminouscoals in order to evaluate the increase of their adsorptive surface area by pyrolysis.The results show that surface area of activated coal samples increased substantially and in somemore than the commercial one. The increase in surface area was higher the higher the carbon contentand the lower the ash content.The adsorption capacity of phenols and the decrease of COD (Chemical Oxygen Demand) in oliveoil mil wastewater disposals were measured in selected samples as well as the decrease of COD andthe adsorption of nitrogen and phosphorus from a solution which simulates city waste disposals weremeasured in 14 selected Greek lignites and 1 commercially available activated lignite sample (HOK).The maximum recorded adsorption of phenol was 30.6 mg/g of activated lignite while the commercialone (HOK) adsorbed 16 mg/g of activated lignite. The COD reduction was 1262 mg of COD/gof activated lignite while in the commercial one the reduction was 439 mg of COD/g of activated lignite.The maximum adsorption of N and P from the simulated city waste liquid was 6.41 mg/g of activatedlignite and 2.52 mg/g of activated lignite, respectively. while the commercial one (HOK)adsorbed 2.84 mg/g and 2.42 mg/g, respectively. Finally, the COD reduction was 50.28 mg/g of activatedlignite and 34.92 mg/g for the commercially one (HOK).The results show that Greek activated lignites can be used successfully for cleaning industrial andcity wastes. These findings open the door for the economic exploitation of small to medium size lignitedeposits in Greece, which are widespread in Greece.

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