Publication: Kaedah olahan fizikal menggunakan campuran media zeolit dan batu kapur dalam menyingkirkan cod dan warna dari larut lesapan semi-aerobik tapak pelupusan pulau burung
Date
2005-03-01
Authors
Ramli, Rohalina
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Abstract
COD (Chemical Oxygen Demand) and color are among the main leachate parameter that may pollute the environment. There are limited studies in Malaysia on leachate treatment, especially by adsorption. Biological and chemical treatments are costly and to date no prove has been reported on their ability to achieve the standard. Previous research has indicated that physical treatments by using charcoal and limestone were capable of attenuating leachate pollution. This present research was carried to study the efficiency of physical treatment by using a mixture of both zeolites and limestone to remove color and COD in leachate generated from Pulau Burung Landfill Site (PBLS). The mixture between limestone and zeolite is advantageous as the cost of limestone is cheaper. Batch studies were conducted in laboratory to analyze the optimum shaking and settling times, shaking speed (rpm), optimum mixture of both materials (zeolites and limestone), isotherms and the adsorption mechanism. By using two hours of shaking and settling times, shaking speed of 300 rpm, the results showed that the combination of both zeolites and limestone at a mixture ratio of 25 : 15 was able to remove 15 % COD and 50 % color from leachate. Adsorption isotherm gave the values of 1/n and kf for COD as 11.292 and 2124, respectively while the values of 1/n and kf for color were -2.2232 and 10x10-6, respectively. Results also indicated that the removal of COD and color was due to chemical sorption, following the pseudo second order kinetic with R2 values for COD and color 0.937 and 0.9927, respectively.