H. Ahmad; N. I. Abd Ghalib; F. M. Shamshudin; N. Ismail
Abstract
Leachate contents from the landfill that infiltrate the liner may contaminate nearby groundwater and river. Hence, the liner material must be chosen properly so that pollutants can be retained as much as possible at the liner thus reducing the contamination risk. This study studied the characteristics ...
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Leachate contents from the landfill that infiltrate the liner may contaminate nearby groundwater and river. Hence, the liner material must be chosen properly so that pollutants can be retained as much as possible at the liner thus reducing the contamination risk. This study studied the characteristics of earthenware clay and pressmud, and their suitability in reducing heavy metals content in leachate. Their suitability to fit as candidate for a landfill liner was tested using batch equilibrium study at 24 and 48 hours reaction times. The mixture of clay and pressmud were labelled PM0, PM10, PM30, PM50, PM80 and PM100 based on their pressmud content. Both reaction time, in any mixtures, manganese easily removed from leachate. 97% zinc was reduced in PM80 after 48 hours reaction time. No significant removal detected for lead in PM0, PM50 and PM80 although the experiment was prolonged from 24 to 48 hours. In a nutshell, for overall contaminants, the longer the reaction time, the higher removal percentage. The clay-pressmud mixtures have the potential to be applied as a landfill liner, however, the removal percentage of metal ions depends on mixture’s physicochemical characteristic.
A. Harlina; M. N. Nur Nazmi Liyana; H. B. Nurul Syuhada; I. Norli
Abstract
Rice field is one of the agriculture areas in Malaysia that is exposed to the usage of pesticide before the paddy planting phase, during vegetative phase and the post- harvesting phase. The study was to determine the water quality and also degradation of isoprothiolane in paddy field water samples. Isoprothiolane ...
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Rice field is one of the agriculture areas in Malaysia that is exposed to the usage of pesticide before the paddy planting phase, during vegetative phase and the post- harvesting phase. The study was to determine the water quality and also degradation of isoprothiolane in paddy field water samples. Isoprothiolane is one of the fungicides that is used during the vegetative phase to kill the fungi on the paddies. This study of isoprothiolane degradation in water samples was conducted in four different conditions, namely autoclaved water sample exposed to sunlight, autoclaved water sample kept in dark, non-autoclave water sample exposed to sunlight and non-autoclaved water sample kept in dark via laboratory batch experiment in a course of 30 days. The extraction and determination of the isoprothiolane in the water samples were done by solid phase extraction method (SPE) and analyzed by Gas Chromatography–Mass Spectrometry (GC-MS). The study revealed that isoprothiolane degraded very slowly in all four conditions within 30 days of observation, and the degradation rates ranged from 0.0003 to 0.0037 day-1. The study also proved that the residue of isoprothiolane remained at least a month after its application.
A. Harlina; M. Maheera; I. Norli
Abstract
This batch study focuses on suitability of laterite soil-pressmud as daily soil cover of landfill. The laterite soil samples were mixed with waste from sugar refinery process, namely pressmud at different percentages of weight ratio (10, 30 and 50%). The batch equilibrium tests were carried out ...
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This batch study focuses on suitability of laterite soil-pressmud as daily soil cover of landfill. The laterite soil samples were mixed with waste from sugar refinery process, namely pressmud at different percentages of weight ratio (10, 30 and 50%). The batch equilibrium tests were carried out and glaringly showed that the laterite soil-pressmud mixtures have the capability to remove more than 62% of Cr, Cu, Mn, Ni, Pb and Zn concentration in leachate. Meanwhile, the removal efficiency of heavy metals from leachate in the laterite soil alone was lower than 50%. Pressmud alone however showed more than 53% removal. The laterite soil-pressmud mixtures, particularly at 30 and 50 percent of pressmud signify great potential as daily soil cover in reduction of heavy metals migration in landfill leachate.
