เอกสารการประชุมวิชาการและเสนอผลงานวิจัย มหาวิทยาลัยทักษิณ ครั้งที่ 19 2552 - page 43

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used in this study. The results show that adsorption isotherm of both natural zeolite base on the preliminary
chromium and zinc adsorption study, the obtained isotherm is consistent to the Langmuir isotherrn. And natural
zeolites, Clinoptilolite is successfully used to adsorb copper, zinc and lead with the adsorption efficiency of 93%
for copper and zinc and 75 % for lead. The results reveal that optimum adsorption parameters are 90 minutes
adsorption time and 4 g/100 ml of the ratio of zeolite usage per water sample volume. The investigated result
indicate that the use of Thai natural zeolite is reasonable for highly copper, zinc and lead adsorption in wastewater
treatment with low cost and environmentally friendly chemical process.
Keywords: Natural zeolite; wastewater, copper; zinc and lead
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