Adsorption Studies of Leachate on Cockle Shells

Abstract

Sanitary landfills are important means of disposing municipal solid waste in developing countries. However, these landfills are associated with the generation of leachate, which if untreated may pose severe public health risk and may damage the ecosystem in the long term. In this study, cockle shells were explored as an adsorbent media for the treatment of a stabilized landfill leachate. The optimum shaking speed, pH, and dosage for chemical oxygen demand (COD) parameter removal were investigated using the adsorbent media of particle sizes ranging from 2.00 mm to 3.35 mm. Leachate characteristics were then determined. Results indicated that leachate is non-biodegradable with high concentrations of COD (1763 mg/L), ammonia nitrogen (573 mg/L), and biochemical oxygen demand/COD (0.09). The optimum conditions for shaking were determined at 150 rpm according to the adsorption of COD by the media. Optimum pH and dosage was 5.5 and 35 g/L, respectively. The adsorption isotherms indicated that Langmuir isotherm is better fitted than Freundlich isotherm.

Utilization of Empty Fruit Bunch Fibre as Potential Adsorbent for Ammonia Nitrogen Removal in Natural Rubber Wastewater

“…With shaking, the external mass transfer coefficient raises causing the faster adsorption of the ammonia nitrogen [8]. Moreover, at very high speed, centrifugal forces operate, resulting in desorption of the adsorbate [21]. The optimum shaking speed obtained from experiment was 150 rpm with the removal efficiency of 71.1%, using EFB.…”

“…Increasing adsorbent dosage above optimum dosage had a negligible effect on the increase in removal efficiency of NH4+ ions. This may be attributed to the formation of aggregates at higher solid/liquid ratios or to precipitation of particles [21]. According to Kehinde & Aziz [22], the pattern of removal with dosage of adsorbent media may be due to higher chances of collision between the pollutants and adsorbent (as treatment media are increased) and the availability of more surfaces with sites for adsorption; in which case the adsorption may be physical and controlled by diffusion.…”

“…These suggest that Langmuir isotherm model enable generate a satisfactory fit to the experimental data, while Freundlich isotherm model vise versa. This Langmuir model assumes surface containing a limited number of adsorption sites and apply monolayer adsorption with no transmigration of adsorbate in the smooth of surface [21].…”

Batch Study on COD and Ammonia Nitrogen Removal Using Granular Activated Carbon and Cockle Shells

“…The GAC was purchased from Cabot Malaysia Sdn Bhd, Negeri Sembilan, Malaysia, at a price of RM4 per kilogram. The CS was obtained and prepared according to the method outlined by [11]. The chemical constituents of the media were determined with X-ray fluorescence spectrometer (Model Bruker S4 pioneer).…”

“…Landfills are naturally employed for discarding of solid waste generated from municipal or industrial activities. Factors have been described in literature that affect solid waste disposal [1][2][3], Landfills and environment [4][5][6][7][8][9][10][11][12][13][14], degradation of leachate and adsorbents [15][16][17][18][19]. Activated carbon is a popular adsorbent for diverse fluid components because of its adsorption capacity, which is *Corresponding Author's Email: zawawi@uthm.edu.my (Z.…”