Formation and release behavior of iron corrosion products under the influence of bacterial communities in a simulated water distribution system
Formation and release behavior of iron corrosion products under the influence of bacterial communities in a simulated water distribution system
复制标题
模拟配水系统中细菌群落影响下铁腐蚀产物的形成和释放行为
DOI：
10.1039/c3em00544e
复制
发表时间：
2014-03-01
影响因子：
5.5
通讯作者：
Wang, Dongsheng
中科院分区：
文献类型：
--
作者：
Sun, Huifang;Shi, Baoyou;Wang, Dongsheng
为了解给水管网中铁腐蚀产物的形成和释放行为，采用环形反应器（ARs）研究了给水管网中铁腐蚀产物和生物膜群落的形成过程以及铁的释放行为.结果表明，腐蚀产物的形成和转化与细菌群落密切相关。生物膜中硫酸盐还原菌（SRB，如脱硫弧菌和脱硫肠状菌）、硫氧化菌（Sodium，如Sulfuricella）和铁氧化菌（IOB，如Acidovorax、Gallionella、Leptothrix和Sphaerotilus）的存在可加速铁的腐蚀;然而，铁还原菌（IRB，如芽孢杆菌、梭菌和假单胞菌）可抑制铁的腐蚀和铁的释放。随着时间的推移，铁片上的腐蚀产物膜会形成双层结构（表层和内层）。相对稳定的组分如针铁矿（α-FeOOH）和磁铁矿（Fe 3 O 4）主要存在于表层，而绿色锈（Fe-6（OH）（12）CO 3）主要存在于内层。IOB（特别是Acidovorax）促进了α-FeOOH、白色IRB的形成，厌氧条件有利于Fe 3 O 4的形成。与无生物膜的AR试验相比，在整个试验期间，有生物膜的铁腐蚀速率相对较高（p < 0.05），但在试验初期和3个月后，有生物膜的铁释放量明显较低。在实际的饮用水管网中，不同供水条件下形成的生物膜和腐蚀产物样品验证了细菌群落与腐蚀产物之间的关系。
To understand the formation and release behavior of iron corrosion products in a drinking water distribution system, annular reactors (ARs) were used to investigate the development processes of corrosion products and biofilm community as welt as the concomitant iron release behavior. Results showed that the formation and transformation of corrosion products and bacterial community are closely related to each other. The presence of sulfate-reducing bacteria (SRB, e.g. Desulfovibrio and Desulfotomaculum), sulfur-oxidizing bacteria (SOB, e.g. Sulfuricella), and iron-oxidizing bacteria (IOB, e.g. Acidovorax, Gallionella, Leptothrix, and Sphaerotilus) in biofilms could speed up iron corrosion; however, iron-reducing bacteria (IRB, e.g. Bacillus, Clostridium, and Pseudomonas) could inhibit iron corrosion and iron release. Corrosion scales on iron coupons could develop into a two-layered structure (top layer and inner layer) with time. The relatively stable constituents such as goethite (alpha-FeOOH) and magnetite (Fe3O4) mainly existed in the top layers, while green rust (Fe-6(OH)(12)CO3) mainly existed in the inner layers. The IOB (especially Acidovorax) contributed to the formation of alpha-FeOOH, white IRB and the anaerobic conditions could facilitate the formation of Fe3O4. Compared with the AR test without biofilms, the iron corrosion rate with biofilms was relatively higher (p < 0.05) during the whole experimental period, but the iron release with biofilms was obviously lower both at the initial stage and after 3 months. Biofilm and corrosion scale samples formed under different water supply conditions in an actual drinking water distribution system verified the relationships between the bacterial community and corrosion products.