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Adsorption of phenols from olive oil mill wastewater as well as n and p from a simulated city wastewater liquid on activeted greek lignites

Pasadakis Nikos, Triantafyllou Georgios, Foskolos Antonis, Papanikolopoulos Konstantinos

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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-bituminous coals 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 content and the lower the ash content. The adsorption capacity of phenols and the decrease of COD (Chemical Oxygen Demand) in olive oil mil wastewater disposals were measured in selected samples as well as the decrease of COD and the 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 commercial one (HOK) adsorbed 16 mg/g of activated lignite. The COD reduction was 1262 mg of COD/g of 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 activated lignite 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 activated lignite 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 lignite deposits in Greece, which are widespread in Greece.

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