两种微生物对山西晋城中高硫煤脱硫最佳工艺条件研究  

Study on optimal process conditions for desulfurization of medium and high sulfur coal in Jincheng,Shanxi Province by two types of microorganisms

作　　者：余童 刘向荣[1,2] 杨再文 赵顺省[1,2] YU Tong;LIU Xiangrong;YANG Zaiwen;ZHAO Shunsheng(College of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,710054,Xi’an,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilisation,Ministry of Natural Resources,710021 Xi’an,China)

机构地区：[1]西安科技大学化学与化工学院,西安710054 [2]自然资源部煤炭资源勘查与综合利用重点实验室,西安710021

出　　处：《煤炭转化》2023年第6期57-69,共13页Coal Conversion

基　　金：国家自然科学基金项目(U1903133,21373158);自然资源部煤炭资源勘查与综合利用重点实验室开放基金项目(KF2021-9)。

摘　　要：燃烧含硫煤炭会释放硫氧化物,导致雾霾、酸雨等环境问题,因此,煤中硫的降低或脱除至关重要。选用能够降解多环芳烃的恶臭假单胞菌和能够降解长链烷烃的茫崖诺卡氏菌对含硫量为2.66%的山西晋城中高硫煤进行微生物脱硫,通过单因素实验和正交实验探究了煤样粒度、煤浆质量浓度、脱硫时间、细菌接种量、培养基pH和培养温度对微生物脱除煤中硫的影响。利用红外光谱仪、X射线衍射仪和扫描电镜对原煤和脱硫后煤样进行了分析表征。结果显示恶臭假单胞菌最佳脱硫条件是:煤样粒度0.075 mm~0.125 mm,煤浆质量浓度0.008 g/mL,培养时间10 d,细菌接种量0.2 mL/mL,培养基pH 6.0、培养温度30℃。茫崖诺卡氏菌的最佳脱硫条件除了培养基pH为7.0与恶臭假单胞菌培养基pH不一样外,其他条件均一致。恶臭假单胞菌和茫崖诺卡氏菌在最佳脱硫条件下的脱硫率分别为38.0%和39.8%,脱硫后煤样中的全硫质量分数分别为1.65%和1.60%,表明经微生物脱硫后煤样含硫量均符合发电用煤S4等级(1.50%<w(St)≤2.00%)。与原煤相比,脱硫后煤样的黄铁矿峰强度有所降低,部分黄铁矿峰消失,说明两种菌都能够脱除煤中黄铁矿,另外,脱硫后煤样中还存在芳香族物质,表面有明显被细菌腐蚀过的痕迹,表明细菌能分泌蛋白质、多糖、酯类等物质,使煤炭表面亲水性增加,细菌更容易附着。从脱硫液相产物萃取产物的GC-MS分析可知,产物中有含硫酯类、酸类等物质,说明煤炭中的硫被细菌脱除了。Burning sulfur-containing coal releases sulfur oxides,leading to environmental issues like haze and acid rain.Hence,it is crucial to reduce or remove sulfur from coal.In this paper,Pseudomonas putida and Nocardia mangyaensis which degrade polycyclic aromatic hydrocarbons and long-chain alkanes respectively were selected,to investigate the microbial desulfurization process of Shanxi Jincheng coal,a medium-high-sulfur coal with a sulfur content of 2.66%.The effects of particle size of coal sample,mass concentration of coal slurry,desulfurization time,bacterial load,culture medium pH and incubation temperature on the microbial desulfurization of coal were explored using single-factor and orthogonal experiments.The original coal and residual coal samples were further analyzed and characterized using infrared spectroscopy,Xray diffraction,and scanning electron microscopy.The results reveal that the optimal desulfurization conditions for Pseudomonas putida included coal sample particle size of 0.075 mm-0.125 mm,coal slurry mass concentration of 0.008 g/mL,incubation time of 10 d,bacterial load of 0.2 mL/mL,culture medium pH of 6.0,and incubation temperature of 30℃.The optimal desulfurization conditions for Nocardia mangyaensis mirrored those of Pseudomonas putida,with an exception of a culture medium pH of 7.0.Under these optimal conditions,the desulfurization efficiencies for Pseudomonas putida and Nocardia mangyaensis are 38.0%and 39.8%,respectively.Consequently,the total sulfur contents of the desulfurized coal samples are 1.65%and 1.60%.The sulfur contents of the coal samples after microbial desulfurization both met the S4 grade(1.50%<w(St)≤2.00%)requirements for power generation coal.Compared with the original coal,the pyrite peak intensity in the residual coal diminished,with some pyrite peaks vanishing entirely.This suggests that both bacteria can remove pyrite from coal.Additionally,aromatic compounds remained in the residual coal,and evident traces of bacterial corrosion on the coal surface was observed,in

关 键 词：细菌 生物脱硫 微生物 中高硫煤 有机硫 

分 类 号：TD849[矿业工程—煤矿开采]