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Complete treatment of olive pomace leachate by coagulation, activated-carbon adsorption and electrochemical oxidation

Xekoukoulotakis Nikos, Mantzavinos Dionysis, Diamantopoulos Evaggelos, Mavros, Michael N

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URI: http://purl.tuc.gr/dl/dias/64123EEA-E64F-4F68-A892-558FA6D562FD
Year 2008
Type of Item Peer-Reviewed Journal Publication
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Bibliographic Citation M. Mavros, N.P. Xekoukoulotakis, D. Mantzavinos, E. Diamadopoulos, "Complete treatment of olive pomace leachate by coagulation, activated carbon adsorption and electrochemical oxidation", Water Research, Vol. 42, no. 12, pp. 2883-2888, Jun. 2008. doi:10.1016/j.watres.2008.02.026. https://doi.org/10.1016/j.watres.2008.02.026
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Summary

A battery scheme comprising sequential alum coagulation, activated-carbon adsorption and electrochemical oxidation over boron-doped diamond electrodes to mineralize a leachate from olive pomace processing is demonstrated. The effect of coagulant and adsorbent concentration on treatment efficiency was assessed in the range 0.1–50 mM Al3+ and 2.5–50 g/L activated-carbon and optimal conditions were established. Coagulation at 7.5 mM Al3+ resulted in substantial solids and color removal (i.e. 80% and 93%, respectively). This was accompanied by only 30% chemical oxygen demand (COD) reduction (initial COD was about 3500 mg/L). The latter increased to 80% though when coagulation was coupled with adsorption at 25 g/L activated carbon.Electrochemical oxidation of the original effluent for 360 min led to 63% and 82% COD reduction at 10 and 20 A current intensity, respectively. When this process was tested as a polishing stage following coagulation and adsorption, overall COD removal reached values of 92% and 97%, respectively. The final effluent was also colorless and solids free. However, the treated effluent still exhibited ecotoxicity possibly due to the formation of ecotoxic oxidation products.

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