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Assessment of the Adsorption Characteristics of Cadmium and Arsenic on Modified Paper Mill Sludge : 개질된 제지슬러지의 카드뮴 및 비소 흡착능 평가
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- Authors
- Advisor
- 박준범
- Major
- 공과대학 건설환경공학부
- Issue Date
- 2014-08
- Publisher
- 서울대학교 대학원
- Keywords
- Paper Mill Sludge ; Sorption isotherm experiments ; Zeta-potential variations ; Cadmium ; Arsenic ; Chemical treatment ; etc.
- Description
- 학위논문 (석사)-- 서울대학교 대학원 : 건설환경공학부, 2014. 8. 박준범.
- Abstract
- The purpose of this study is to promote utilization of paper mill sludge as an adsorbent for stabilizing heavy metals in contaminated water by measuring the adsorption capacity of paper mill sludge for cadmium and arsenic. To measure adsorption capacity of paper mill sludge, sorption isotherm experiments were analyzed by Langmuir and Freundlich isotherm models. Also, two methods of chemical modifications were applied to improve the adsorption capacities of paper-mill-sludge: the first method used sodium hydroxide (NaOH), called PMS-1, and the second method used the NaOH and tartaric acid (C4H6O6) together, called PMS-2. For Cd adsorption, PMS-1 presented the increase of reactivity while PMS-2 presented the decline of reactivity compared to that of untreated paper-mill-sludge. In case of As adsorption, both PMS-1 and PMS-2 showed the decrease of adsorption capacities. FTIR, XRF and zeta-potential experiment were performed to find out a reason about difference of adsorption characteristics between original and modified paper mill sludge. Zeta-potential of paper mill sludge was changed to more negative values during chemical modification process due to the hydroxyl group in NaOH and the carboxyl group in C4H6O6, respectively. Therefore, we may conclude that the chemical treatment process increases adsorption capacity of paper mill sludge for cation heavy metals such as Cd but not for As. Also, C4H6O6 can reduce amount of CaO(calcium oxide) which can remove Cd by releasing OH- (hydroxide) and amine group which is known as a chelating agent in paper mill sludge. In case of PMS-2, final pH was decreased. This variation brings about competitive effect of cation. So, it decreases adsorption capacity for heavy metals. In these reasons, in case of ground water or Leachate contaminated with cation heavy metal such as Cd, NaOH treatment is efficient. Inversely, when ground water was contaminated with anionic heavy metals such as As, using untreated paper mill sludge is better.
- Language
- English
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