期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 288, 期 -, 页码 51-59出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.02.017
关键词
Bioleaching; Aspergillus niger; Fenton-like reaction; Trace metal removal; Dewaterability; Sediments
资金
- National Science & Technology Pillar Program [2012BAC17B04]
- Hi-tech Research and Development Program of China [2012AA06A202]
- Ministry of Science and Technology [2011DFA91810]
- National Natural Science Foundation of China [31270540, 21277150, 31070455, 40971184]
- Geping Green Action-environmental Research and Education 123 project of Liaoning Province [CEPF2011-123-1-1]
- Polish Academy of Sciences
- Chinese Academy of Sciences
Bioleaching by Aspergilius niger strain SY1 combined with Fenton-like reaction was optimized to improve trace metal removal and dewaterability of dredged sediments. The major optimized parameters were the duration of bioleaching and H2O2 dose in Fenton-like process (5 days and 2 g H2O2/L, respectively). Bioleaching resulted in the removal of approximate to 90% of Cd, approximate to 60% of Zn and Cu, approximate to 20% of Pb, and in decrease of sediment pH from 6.6 to 2.5 due to organic acids produced by A. niger. After addition of H2O2 Fenton-like reaction was initiated and further metal removal occurred. Overall efficiency of the combined process comprised: (i) reduction of Cd content in sediment by 99.5%, Cu and Zn by >70% and Pb by 39% as a result of metal release bound in all mobilizable fractions; (ii) decrease of sediment capillary suction time (CST) from 98.2 s to 10.1 s (by 89.8%) and specific resistance to filtration (SRF) from 37.4 x 10(12) m/kg to 6.2 x 10(12) m/kg (by 83.8%), due to reducing amount of extracellular polymeric substances (EPS) by 68.7% and bound water content by 79.1%. The combined process was found to be an efficient method to remove trace metals and improve dewaterability of contaminated dredged sediments. (C) 2015 Elsevier B.V. All rights reserved.
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