微生物营养供应对煤炭生物脱硫的影响。

Effect of microbial nutrients supply on coal bio-desulfurization.

机构信息

Environmental Engineering Laboratory, College of Resource and Environment, Shanxi Agricultural University, Taigu, 030801, China.

出版信息

J Hazard Mater. 2020 Feb 15;384:121324. doi: 10.1016/j.jhazmat.2019.121324. Epub 2019 Sep 26.

DOI:10.1016/j.jhazmat.2019.121324

PMID:31586921

Abstract

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 (MFe(SO)(OH), M = K, NH) and gypsum (CaSO·2HO), which further declined the pyritic sulfur bio-oxidation efficiency and total sulfur removal efficiency.

摘要

煤炭脱硫研究对于经济、社会和环境的可持续发展非常重要。本研究采用氧化亚铁硫杆菌进行了三批次摇瓶实验，以探索微生物营养物质（无铁 M9K 培养基）供应与煤炭生物脱硫效率之间的关系。结果表明，在将先前批次的煤滤液重新引入后，煤中黄铁矿硫和总硫的去除率均得到有效提高。在三批次未添加无铁 M9K 培养基的实验中，黄铁矿硫和总硫的去除率分别为 55.6%和 10.0%、77.1%和 16.1%、86.5%和 28.2%。相比之下，在三批次添加 6.7%无铁 M9K 培养基的实验中，黄铁矿硫和总硫的去除率分别达到 87.5%和 28.2%、89.1%和 31.6%、92.0%和 29.1%。然而，添加过量的无铁 M9K 培养基不利于煤炭生物脱硫，因为会合成黄钾铁矾（MFe(SO)(OH)，M=K，NH）和石膏（CaSO·2HO），这进一步降低了黄铁矿硫的生物氧化效率和总硫去除效率。