希瓦氏菌还原作用下黄钾铁矾的相转变特征及其负载铬的迁移转化规律  

The microbial transformation of Cr-bearing jarosite by Shewanella oneidensis MR-1 and the associated Cr behavior

作　　者：王文静 高坤 叶翰 郭楚玲 卢桂宁[1,2] 党志 WANG Wenjing;GAO Kun;YE Han;GUO Chuling;LU Guining;DANG Zhi(School of Environment and Energy,South China University of Technology,Guangzhou 510006;Key Laboratory of Pollution Control and Ecosystem Restoration in Industrial Clusters,Ministry of Education,Guangzhou 510006;Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling,Guangzhou 510006)

机构地区：[1]华南理工大学环境与能源学院,广州510006 [2]工业聚集区污染控制与生态修复教育部重点实验室,广州510006 [3]广东省固体废物污染控制与资源化重点实验室,广州510006

出　　处：《环境科学学报》2021年第4期1323-1332,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.41720104004,41931288);国家重点研发计划(No.2017YFD0801000);广东省自然科学基金(No.2018A030313918);广东省重点领域研发计划(No.2019B110207001)。

摘　　要：黄钾铁矾对酸性矿山废水中铬(Cr)等污染物有较好的固定去除作用.微生物活动对黄钾铁矾的稳定性和Cr的迁移转化特性有重要影响.因此,本研究在厌氧条件下,通过批次实验研究了希瓦氏菌MR-1还原溶解负载Cr黄钾铁矾过程中二次矿物的形成和Cr污染物的迁移转化特性.结果表明,希瓦氏菌能够促进黄钾铁矾的还原溶解.Cr负载能够增强黄钾铁矾的稳定性,抑制矿物的溶解转化.在不含Cr实验组,黄钾铁矾相转变产物为蓝铁矿和针铁矿;而在负载Cr实验组,二次矿物仅为蓝铁矿.在希瓦氏菌还原溶解负载Cr黄钾铁矾的过程中,矿物中有少量的Cr溶出,进入水体,随后又被吸附于新形成的二次矿物中.矿物中的Cr由原来的残渣态转化为不定型铁结合态,固相中Cr释放的风险增大.XPS检测结果表明,矿物表面的Cr(Ⅵ)被还原为Cr(Ⅲ),Cr的毒性降低.研究结果对进一步理解酸性矿山废水中Fe、S和Cr的地球化学循环过程有重要意义.Jarosite is a potential scavenger for the containments such as chromium(Cr) in acid mine drainage(AMD) environments. Microbial decomposition plays an important role in controlling the jarosite stability and Cr behavior. In this study, we investigated the formation of secondary mineral and the fate of Cr during reductive dissolution of Cr-bearing jarosite by Shewanella oneidensis MR-1(S. oneidensis MR-1) using a batch experiment under anaerobic conditions. Results indicated that S. oneidensis MR-1 can drive the reductive dissolution of jarosite. The incorporation of Cr increased the stability of jarosite, retarding the transformation of jarosite mineral. After 50 days inoculation, the jarosite with no Cr incorporation transformed to vivianite and goethite. However, vivianite was the only secondary mineral for the Cr-bearing jarosite. During the reduction of Cr-bearing jarosite by S. oneidensis MR-1, little Cr released from the Cr-bearing jarosite to the solution initially, and then re-adsorbed to the secondary mineral. The Cr in the fraction of crystalline iron oxide-bound phase changed to amorphous iron oxide-bound phase in biotic treatments, the likelihood of Cr release increased. XPS analysis indicated that the Cr(Ⅵ) in solid surface was obviously reduced Cr(Ⅲ). The toxicity of Cr to surrounding environment decreased. The results of this study are of significant to further understand the geochemistry of Fe, S and Cr in AMD environments.

关 键 词：黄钾铁矾 铬 希瓦氏菌 二次矿物 地球化学 

分 类 号：X131[环境科学与工程—环境科学] X172