Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 384, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.121324
Keywords
Coal; Acidithiobacillus ferrooxidans; Microbial nutrients; Pyritic sulfur
Categories
Funding
- National Natural Science Foundation of China [21637003, 21407102]
- Program for the Top Young Innovative Talents of Shanxi Agricultural University, China [TYIT 201405]
- Key R&D Program Projects in Shanxi Province, China [201803D221002-2]
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Research on coal desulfurization is very important for economic, social, and environmentally sustainable development. In this study, three batches of shake flask experiments were conducted for coal bio-desulfurization using Acidithiobacillus ferrooxidans to explore the relationship between microbial nutrients (iron-free M9 K medium) supply and coal bio-desulfurization efficiency. The results showed that the removal rates of pyritic sulfur and total sulfur from coal effectively increased following reintroduction of coal into the filtrate from previous batch. The removal rates of pyritic sulfur and total sulfur were 55.6% and 10.0%, 77.1% and 16.1%, and 86.5% and 28.2%, respectively, in the three batch experiments without iron-free M9 K medium addition. In contrast, the removal rates of pyritic sulfur and total sulfur reached 87.5% and 28.2%, 89.1% and 31.6%, and 92.0% and 29.1%, respectively, in the three batch experiments with 6.7% iron-free M9 K medium addition. However, addition of excessive iron-free M9 K medium was detrimental to coal bio-desulfurization because of the synthesis of jarosite (MFe3(SO4)(2) (OH)(6), M = K+, NH4+) and gypsum (CaSO4 center dot 2H(2)O), which further declined the pyritic sulfur bio-oxidation efficiency and total sulfur removal efficiency.
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