期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 287, 期 -, 页码 69-77出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.01.042
关键词
Coal fly ash; Zeolites; Integrated synthesis; Detergents; Swine wastewater
资金
- CNPq
- FAPERGS
Several researchers have reported zeolite synthesis using coal ash for a wide range of applications. However, little attention has been given to green processes, including moderate synthesis conditions, using waste as raw material and effluent reuse or reduction. In this study, Brazilian coal fly ashes were used for integrated synthesis of zeolites 4A and Na-P1 by two different routes and under moderate operating conditions (temperature and pressure). Both procedures produced zeolites with similar conversions (zeolite 4A at 82% purity and zeolite Na-P1 at 57-61%) and high CEC values (zeolites 4A: 4.5 meq Ca2+ g(-1) and zeolites Na-P1: 2.6-2.8 meq NH4+ g(-1)). However, process 1 generated less effluent for the zeolite mass produced (7 mL g(-1)), with low residual Si and Al levels and 74% of the Si available in the coal fly ash incorporated into the zeolite, while only 55% is used in process 2. For use as a builder in detergents, synthetic zeolite 4A exhibited conformity parameters equal to or greater than those of the commercial zeolite adopted as reference. Treatment of swine wastewater with zeolite Na-P1 resulted in a high removal capacity for total ammoniacal nitrogen (31 mg g(-1)). (C) 2015 Elsevier B.V. All rights reserved.
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