Stabilized landfill leachate treatment using Guadua amplexifolia bamboo as a source of activated carbon: kinetics study

ABSTRACT

In the present study, the characteristics of leachate generated from dumpsite called ‘Zapote’ located in southern region of Tamaulipas, Mexico were evaluated. The adsorption of non-biodegradable organic matter measured as chemical oxygen demand (COD), color and heavy metals from leachate on activated carbon (AC) prepared in acid media from Guadua amplexifolia bamboo has been studied. In addition, the computation of kinetic parameters during the adsorption process as well as the most probable mechanisms was determined. The ACs were analyzed by using scanning electron microscopy and Fourier transform infrared spectroscopy. The experimental data showed that the ACs removed up to 81.4% of color and reduced COD up to 91.6% after 9 h of reaction at 60°C. For heavy metals, the maximum adsorption uptake was achieved at pH = 8.0 within 20 min with removal percentages of 87.0% (Pb(II)), 43.0% (Cu(II)) and 30.5% (Ni(II)). A pseudo-second-order model explained the adsorption kinetics most effectively for Pb, Ni and Cu, while a pseudo-first order was found for Zn. The AC synthesized from the G. amplexifolia species could be potentially used as an effective adsorbent in the reduction of COD, and removal of color and heavy metals.

KEYWORDS:

• Dumpsite
• stabilized leachate
• activated carbon
• Guadua amplexifolia
• adsorption mechanism

Acknowledgements

Bianka Salas-Enríquez is grateful for her postgraduate fellowship through SIP-IPN and COFAA-IPN. This work was technically supported by the Centro de Investigación y Tecnología en Saneamiento Ambiental (CITSA) and (Laboratorio de biotecnología ambiental, Instituto Tecnológico de Celaya). Thanks to Q.F.B. Sandra Luz Suastes Acosta for her technical support.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors are also grateful for the financial support provided by CONACYT (Consejo Nacional de Ciencia y Tecnología) (through the CB2009-132660 and CB2009-133618 projects), SIP-IPN (Secretaría de Investigación y Posgrado del Instituto Politécnico Nacional) (through the SIP 2015-0227 and 2015-0202 projects) and SNI-CONACYT (Sistema Nacional de Investigadores del Consejo Nacional de Ciencia y Tecnología) (no. 35697).