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Ahvaz Jundishapur University of Medical Sciences

مقایسه کارایی پلی آلومینیم کلراید و کیتوزان در حذف فلز نیکل و روی از آبهای آلوده Comparing the efficiency of poly aluminum chloride and chitosan in the removal of nickel and zinc from contaminated water

منگلی زاده, نظام الدین (2012) مقایسه کارایی پلی آلومینیم کلراید و کیتوزان در حذف فلز نیکل و روی از آبهای آلوده Comparing the efficiency of poly aluminum chloride and chitosan in the removal of nickel and zinc from contaminated water. Masters thesis, دانشگاه علوم پزشکی جندی شاپور اهواز,دانشکده بهداشت

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Abstract

افزایش استفاده از فلزات سنگینی همچون نیکل و روی در فرایندهای صنعتی منجر به تولید مقادیر فراوانی از پساب هایی شده که باعث آلودگی محیط زیست می گردد. هدف از این مطالعه مقایسه کارایی کیتوزان و پلی الومینیوم کلراید در Introduction Increasing in the consumption of heavy metals such as Zn and Ni in industrial processes can lead to high concentration of these metals in wastewater, which pollute the environment. The aim of this study was to compare the efficiency of chitosan and PACl in the removal of Zn and Ni from contaminated waters. Material and method This study was done in laboratory scale. The effects of pH, amount of coagulant and coagulant aid, initial amount of metal and settling time in the removal of Zn and Ni were studied. For measurement of these metals AAS was used. Result Optimum pH in coagulation and flocculation processes for both chitosan and PACl were 11. At the beginning, increasing in the amount of coagulants led to increasing in Zn and Ni removal efficiencies but then their efficiencies decreased. The most amount of Zn and Ni removal with chitosan and PACl were seen in 100 and 150-500 mg/l, respectively. The results of this study also showed that initial concentration of metal had inverse relation with Zn and Ni removal efficiencies in coagulation and flocculation processes. According to initial metal concentrations which used in this study, the most amounts of Zn and Ni removal efficiencies in coagulation and flocculation were related to 3, 5 and 10 mg/l of metal and in these concentrations removal efficiencies were 100%. By increasing in the concentration of chitosan as a coagulant aid, the amount of Zn and Ni removal efficiencies increased. In coagulation and flocculation processes with PACl and chitosan, increasing in settling time caused increasing in the percentage of Zn and Ni removal and the maximum percentage of metal removal were seen in 120 min. presence of Zn and Ni simultaneously in aqueous solutions caused decreasing in metal removal. Conclusion The results of this study showed that chitosan had higher removal efficiency than PACl for removal of Zn and Ni, and also chitosan as a coagulant aid led to increasing in metal removal.

Item Type: Thesis (Masters)
Keywords: انعقاد و لخته سازی، پلی آلومینیم کلراید، کیتوزان، فلز روی، فلز نیکل Coagulation and flocculation, PACl, Chitosan, Zn and Ni
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Divisions: Faculty of Medicine, Health and Life Sciences > School of Medicine
Depositing User: آقای بهرام سوسنی غریب وند
Date Deposited: 03 Apr 2017 04:38
Last Modified: 03 Apr 2017 04:38
URI: http://eprints.ajums.ac.ir/id/eprint/3822

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