제올라이트 및 활성탄을 사용하는 이온 교환 공정에서 고농도의 액상 암모늄 제거
High levels of ammonium removal by an ion exchange process using zeolite and activated carbon in the aqueous phase
- 주제(키워드) mmonium , synthetic zeolite , ion exchange , activated carbon , regeneration
- 발행기관 아주대학교
- 지도교수 최권영
- 발행년도 2018
- 학위수여년월 2018. 2
- 학위명 석사
- 학과 및 전공 일반대학원 환경안전공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000027495
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
In this study, the ammonium removal efficiency of zeolite and activated carbons in the aqueous phase was investigated by batch adsorption assay. Among the adsorbents examined, synthetic zeolite A-4 was the most effective at ammonium removal in aqueous solution. The removal efficiency was measured under various reaction conditions of pH, adsorbent dosage, stirring speed, and initial ammonia concentration. The optimum pH was established to be between 6 and 7. The highest removal efficiency of 53% was achieved at a speed of 50 rpm. The higher the amount of adsorbent used, the higher the removal efficiency achieved, up to 89%. Finally, the adsorptive capacity of synthetic zeolite A-4 was determined as 26.6 mg/g at 1000 mg-N/L of ammonium, whereas that of natural zeolite was measured as 16.0 mg/g. The obtained adsorption data was fitted to both Langmuir and Freundlich isotherm models, and the Langmuir isotherm model (= 0.9900) provided a better correspondence than the Freundlich isotherm (= 0.9538). A value of 1/n between 0.1 and 1 was shown to be advantageous for the adsorption removal processes.
more목차
Ⅰ. Introduction 1
Ⅱ. Experimental section 3
1. Zeolite sample 3
2. Analytical methods 4
3. Batch adsorption experiments 5
4. Zeolite regeneration 6
Ⅲ. Results and discussion 7
1. Adsorbent characterization 7
2. Comparison of Removal Efficiency of Activated Carbon Pellets and Zeolite 12
3. Optimization of adsorption conditions: Stirring speed, pretreatment,and pH 14
4. Optimization of adsorption conditions: Amount of synthetic zeolite 18
5. Adsorbent isotherm 20
6. Regeneration of synthetic zeolite A-4 23
Ⅳ. Conclusions 28
References 29
