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.

Nitrogen Removal from Landfill Leachate Using Biochar Derived from Wheat Straw

“…These suggest that the greater the dilution (or concentration decrease) of the LLCH, the better the elimination of color and nitrogen content [72]. Furthermore, the effectiveness of biochar in removing contaminants such as nitrogen from landfill leachate has also been demonstrated [77]. Additionally, studies have shown that the adsorption capacity of biochar increases from increasing the initial concentration of nitrogen or other contaminants in the solution [78].…”

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

“…Sanitary landfill leachate (SLL) is extensively generated in sanitary landfills [1] as a result of rainwater infiltrating the disposed solid waste, which undergoes biological and physicochemical decomposition, as well as its inherent moisture content [2]. SLL is a darkcolored heterogeneous mixture [3,4] consisting of high concentrations of organic matter quantified as chemical oxygen demand (COD), heavy metals, chlorinated organic and inorganic salts, and extremely high concentrations of ammonium nitrogen (NH 4 + -N) [2,5,6]. The improper operation of a sanitary landfill, including leachate collection and treatment, poses serious risks to nearby surface waters, surrounding soils and groundwater [2,7].…”