硫酸盐还原菌与铁还原菌联合释放含砷水铁矿中砷及渗透性研究  

Study on the release of arsenic and permeability from arsenic-containing ferrihydrite by sulfate reducing bacteria and acidiphilium cryptum JF-5

作　　者：张世英 刘莹 刘琴 骆大勇[2] 刘璟 ZHANG Shi-ying;LIU Ying;LIU Qin;LUO Da-yong;LIU Jing(College of Resources and Environment,Southwest University,Chongqing 400715,China;College of Resources and Security,Chongqing Vocational Institute of Engineering,Chongqing 402260,China)

机构地区：[1]西南大学资源环境学院,重庆400715 [2]重庆工程职业技术学院资源与安全学院,重庆402260

出　　处：《岩石矿物学杂志》2024年第4期982-993,共12页Acta Petrologica et Mineralogica

基　　金：重庆市自然科学基金(CSTB2022NSCQ-MSX1382)。

摘　　要：水铁矿是土壤中常见的铁氧化物矿物,也是主要的载砷矿物。从水铁矿中释放砷,是缓解土壤砷污染的一种途径。本文拟通过硫酸盐还原菌(SRB)和嗜酸铁还原菌(JF-5)生物还原含砷水铁矿(As-Fh),促进其砷释放,以达到土壤修复目的。为此,利用采集自湖南石门矿区的典型含砷水铁矿,进行两种微生物摇瓶实验和生物注入水铁矿柱实验,探究水铁矿释放砷浓度及形态、生物溶解过程中悬浮颗粒物变化以及体系渗透性问题。研究结果表明:①在两个循环周期下,从释放的砷总量可看出,JF-5+SRB操作>JF-5+JF-5操作>SRB+JF-5操作>SRB+SRB操作,对应这些操作每克水铁矿能够分别释放16.4、16.2、7.3和3.3 mg的砷;②水化学分析也表明同等操作下SRB能够提供比JF-5更强的还原性;③生物柱实验表明,相比于SRB来说,JF-5的注入能够产生平均浓度1419 mg/L的铁系悬浮颗粒物,是SRB的7.25倍;同时两种生物操作过程下,SRB柱体系渗透性(平均水压差为0.51 psi)显著优于JF-5(平均水压差为2.22 psi),高悬浮颗粒的分散是引起渗透性变化的主因。上述结果证明连续注入SRB于水铁矿体系,是一种有效的降低土壤中砷浓度的技术。Ferrihydrite is a common iron oxide mineral in soil and also the main arsenic carrying mineral.Releasing arsenic from ferrihydrite is a way to alleviate arsenic pollution in soil.In this paper,it is intended to promote the release of arsenic by biological reduction of arsenic-containing ferrihydrite(As-Fh)by sulfate reducing bacteria(SRB)and acidiphilium cryptum JF-5(JF-5),so as to achieve the purpose of soil remediation.To this end,two kinds of microbial shaker experiment and biological injection experiment were carried out by collecting typical arsenic-containing ferrihydrite from Shimen mining area in Hunan Province,to explore the arsenic release and form of ferrihydrite,the change of suspended particulate matter in the process of biological dissolution,and the permeability of the system.The results showed that:①In two cycles,according to the total amount of arsenic released,JF-5+SRB operations>JF-5+JF-5 operations>SRB+JF-5 operations>SRB+SRB operations,corresponding to these operations were able to release 16.4,16.2,7.3 and 3.3 mg per gram of ferrihydrite,respectively;②Hydrochemical analysis also showed that SRB could provide stronger reducibility than JF-5 under the same operation;③The biological column experiment showed that compared with SRB,JF-5 injection could produce iron suspended particulate matter with an average concentration of 1419 mg/L,7.25 times that of SRB;At the same time,the permeability of SRB column system(mean water pressure difference of 0.51 psi)was significantly better than that of JF-5(mean water pressure difference of 2.22 psi),and the dispersion of highly suspended particles was the main reason for the permeability change.These results demonstrate that continuous injection of SRB into the ferrihydrite system is an effective technique for reducing arsenic concentration in soil.

关 键 词：硫酸盐还原菌 嗜酸铁还原菌 含砷水铁矿 砷释放 渗透性 

分 类 号：P578.4[天文地球—矿物学] P579[天文地球—地质学]