Equilibrium isotherm and kinetic study of the adsorption of organic pollutants of leachate by using micro peat-activated carbon composite media

Abstract

The suitability of micro peat (MP) and activated carbon (AC) mixed media as a composite adsorbent for the landfill leachate treatment in terms of COD reduction and color removal was investigated in this study. All the adsorption media was pulverized and sieved to a particle size of 150 μm. The MP-AC composite media efficiently removed 87% COD at optimal ratio 1.5:2.5 and 74% color at optimal ratio 2.0:2.0, within 120 min of contact time, 200 rpm of shaking speed at pH 7. The findings revealed that Langmuir isotherm best described the uptake of COD and color which implies that the adsorption of leachate in this study onto MP-AC composite media was homogeneous on a mono layer surface. The kinetic data and the factor controlling adsorption process fitted better to the pseudo-second-order model. Energy of adsorption (E) were observed as 267.26 kJ mol-1 and 79.06 kJ mol-1 for COD and color respectively indicating chemisorption as the limiting controlling step for the reduction of COD and color onto MP-AC composite media. The overall rate of the COD and color adsorption processes onto MP-AC composite media appears to be dominated by chemisorption. The pattern of adsorption showed that micro peat offers a cost effective alternative and can be utilized as partial replacement of conventional media (AC) for the removal of organic matters from landfill leachate.

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

“…achieved a high level of removal of Fe and colour from a LL using a commercial AC and a low‐cost natural adsorbent obtained from peat at pH 7. This adsorbent material showed kinetic data that fitted adequately with a pseudo‐second‐order model, and considering the adsorption energy, the author also observed that chemisorption is the limiting controlling step for colour and COD reduction …”

“…This adsorbent material showed kinetic data that fitted adequately with a pseudo-second-order model, and considering the adsorption energy, the author also observed that chemisorption is the limiting controlling step for colour and COD reduction. 45 The best results were obtained after a longer adsorption period, which allowed more time for the mass transfer. 46 The increase in pollutant adsorption was enhanced by longer contact time due to the decrease in the boundary layer resistance of the adsorption layer.…”

The Effectiveness of Macrocomposite Adsorbent for Treatment of COD and Suspended Solid of Car Wash Water Effluent

“…Therefore, the percentage removal was frequently used to determine the performance of macrocomposite which assesses how many contaminants were removed. Performance of COD and SS percentage removal based on fixed-bed adsorption column regarding the flow volume can be evaluated through the equation (3) [10]:…”

Surrogate-based follow-up of activated carbon adsorption preceded by ozonation for removal of bulk organics and micropollutants from landfill leachate

“…In contrast, adsorption processes have the advantage of being able to remove a wide range of substances, easy to use, and with no toxic by-product generation (Dąbrowski, 2001). In comparison to other technologies, adsorption is suitable for the removal of organics due to large surface area and competitive sites for attachment of organics on the surface of the adsorbent (Rosli et al, 2019). However, the operational cost of adsorption for leachate treatment is still high and the adsorption of MPs may be limited by competition with and fouling by the co-existing bulk organics (Guillossou et al, 2020b).…”