摘要
本研究通过驯化得到以SRB为主的混合微生物群落,并将其用于处理铁矾渣,通过检测还原过程中溶质参数、物相转化和微生物群落的演变,探索铁矾渣的还原和硫化.铁矾渣的还原溶解试验结果表明,在SRB的作用下,铁矾渣中的SO_(4)^(2-)含量不断降低,溶液环境的pH升高,氧化还原电位(ORP)不断降低,Fe^(2+)大量增加,Pb^(2+)、Zn^(2+)并未大量溶解.XRD和SEM分析表明,铁矾渣中的硫酸盐矿物如黄铁矾和石膏逐渐被SRB群落还原,其相应的物相基本消失不见,同时发现了代表马基诺矿和蓝铁矿等次生矿物的特征峰.菌群分析表明,SRB的相对丰度增加并成为培养体系中的优势菌种,但SRB主要存在的属从Citrobacter演变为Desulfofarcimen.这些结果证明了利用SRB还原铁矾渣并将其转换为硫化物的可行性,为使用生物硫化-浮选法处理铁矾渣提供了理论基础.
The reduction and phase transformation of jarosite residues were investigated by measuring the solute parameters,phase transformation and microbial community evolution during the reduction process with the mixed microbial community dominated by SRB,obtained by domestication.The results showed that under the action of SRB,the content of SO_(4)^(2-)in the residues continuously decreased,the solution pH slightly increased,the oxidation-reduction potential(ORP)continuously lowered,the Fe^(2+)magnified significantly,while Pb^(2+)and Zn^(2+)were only slightly dissolved.The sulfate minerals such as jarosite and gypsum in the residues were gradually reduced by the SRB community,thus resulting in their disappearance,and the characteristic peaks of secondary minerals such as markinite(FeS)and vivianite(Fe_(3)(PO_(4))_(2)(H_(2)O)_(8))appeared.The relative abundance of SRB increased,and gradually SRB became the dominant strains in the culture system,But the genus in which SRB was predominantly present had evolved from citrobacter to desulfofarcimen.These results demonstrate the feasibility of SRB to be used to reduce jarosite residues and further convert metals into sulfide,provide a theoretical basis for the recovery of valuable metals in the residues by the biological-sulfide flotation.
作者
周轶臣
杨慧芬
宋英良
孙启伟
高普
宋振国
杨航
ZHOU Yi-chen;YANG Hui-fen;SONG Ying-liang;SUN Qi-wei;GAO Pu;SONG Zhen-Guo;YANG Hang(Department of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Mineral Processing Science and Technology,Beijing 102628,China)
出处
《中国环境科学》
CSCD
北大核心
2023年第S1期170-178,共9页
China Environmental Science
基金
矿物加工科学与技术国家重点实验室开放基金(BGRIMM-KJSKL-2022-)
关键词
铁矾渣
硫酸盐还原菌
还原溶解
次生矿物
硫化物
Jarosite residues
sulfate-reducing bacteria
reductive dissolution
secondary minerals
sulfide
