Development of Hybrid Systems by Integrating an Adsorption Process with Natural Zeolite and/or Palygorskite into the Electrocoagulation Treatment of Sanitary Landfill Leachate

Christiana Genethliou, Irene-Eva Triantaphyllidou, Dimitrios Chatzitheodorou, Athanasia G. Tekerlekopoulou () and Dimitris V. Vayenas
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Christiana Genethliou: Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
Irene-Eva Triantaphyllidou: Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
Dimitrios Chatzitheodorou: Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
Athanasia G. Tekerlekopoulou: Department of Sustainable Agriculture, University of Patras, 2 G. Seferi Str., 30100 Agrinio, Greece
Dimitris V. Vayenas: Department of Chemical Engineering, University of Patras, 26504 Patras, Greece

Sustainability, 2023, vol. 15, issue 10, 1-19

Abstract: The effectiveness of a hybrid approach comprising electrocoagulation (EC) and adsorption (AD) (using natural zeolite and/or palygorskite) processes to treat raw sanitary landfill leachate (SLL) was investigated in terms of color, dissolved chemical oxygen demand (d-COD), nitrate nitrogen (NO 3 − -N) and ammonium nitrogen (NH 4 + -N) removal. Optimal EC conditions were found with a current density of 30 mA cm −2 , Fe electrode material and pH 8. Implementation of the AD process using zeolite (AD zeo ) as pre- or post-treatment for EC significantly increased the NH 4 + -N removal efficiency. The AD zeo -EC sequential treatment showed considerably higher color removal compared to the EC-AD zeo sequential treatment and was therefore determined to be the optimal sequential treatment. Integration of the AD process using palygorskite (AD pal ) into the first or middle stage of the AD zeo -EC treatment system enhanced the overall NO 3 − -N removal efficiency. The hybrid AD zeo -AD pal -EC treatment system exhibited the highest simultaneous removal efficiencies of color, d-COD, NO 3 − -N and NH 4 + -N, corresponding to 95.06 ± 0.19%, 48.89 ± 0.89%, 68.38 ± 0.93% and 78.25 ± 0.61%, respectively. The results of this study indicate that the AD zeo -AD pal -EC hybrid system is a promising and efficient approach for treating raw landfill leachate.

Keywords: landfill leachate; hybrid system; electrocoagulation; adsorption; zeolite; palygorskite (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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