硝酸盐还原菌对给水铸铁管道的腐蚀特性研究  

orrosion Characteristics of Nitrate-reducing Bacteria on Cast Iron Pipe for Water Supply

作　　者：刘沙沙 张卉[1,2] 常珊 刘悦凯 王文东 LIU Sha-sha;ZHANG Hui;CHANG Shan;LIIU Yue-kai;WANG Wen-dong(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Northwest China Key Laboratory of Water Resources and Environment Ecology,Xi'an University of Architecture and Technology,Xi'an 710055,China;Zhejiang Province Institute of Architectural Design and Research,Hangzhou 310006,China;School of Human Settlements and Civil Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安建筑科技大学西北水资源与环境生态教育部重点实验室,陕西西安710055 [3]浙江省建筑设计研究院,浙江杭州310006 [4]西安交通大学人居环境与建筑工程学院,陕西西安710049

出　　处：《中国给水排水》2023年第7期43-49,共7页China Water & Wastewater

基　　金：陕西省自然科学基础研究计划重点项目(2021JZ-50);陕西省教育厅青年创新团队建设科研计划项目(21JP065)。

摘　　要：我国的给水管道仍以铸铁管道为主,铸铁管道在长期使用过程中会产生腐蚀问题,容易造成饮用水二次污染。为此,采用实验室小型反应器,以蒙氏假单胞菌CS01为代表性硝酸盐还原菌,研究了不同硝酸盐初始浓度下细菌CS01对给水铸铁管道的腐蚀作用,并结合理化分析和失重法探究腐蚀产物特性和腐蚀速率。结果表明,细菌CS01的存在和NO_(3)^(-)-N初始浓度的增大,有利于腐蚀产物中Fe_(3)O_(4)的生成,进而对腐蚀和铁释放起到抑制作用。在NO_(3)^(-)-N初始浓度为20 mg/L条件下,总铁浓度和腐蚀速率均最低,分别为(2.30±1.25)mg/L、(0.036±0.003)mm/a(第170天),而且NO_(3)^(-)-N消耗量以及NO_(2)^(-)-N和NH_(4)^(+)-N生成量均达到最高;腐蚀产物以α-FeOOH(针状和层状)、CaCO_(3)(粒状)和Fe_(3)O_(4)(球状)为主。In China,water supply pipes are still mainly cast iron pipes,which will cause corrosion problem in the long-term service process and drinking water secondary pollution.Therefore,the corrosion effects of Pseudomonas monteilii CS01 on cast iron pipes for water supply under different initial nitrate concentrations was investigated in small laboratory reactors,and the characteristics of corrosion products and corrosion rate were explored by physical and chemical analysis combined with weight loss method.The presence of CS01 and the increase of initial NO_(3)^(-)-N was conducive to the formation of Fe_(3)O_(4) in the corrosion products,thus inhibiting the corrosion and iron release.When the initial NO_(3)^(-)-N was 20 mg/L,the total iron concentration and corrosion rate were the lowest,which were(2.30±1.25)mg/L and(0.036±0.003)mm/a(at 170 days),respectively,and the consumption of NO_(3)^(-)-N and the production of NO_(2)^(-)-N and NH_(4)^(+)-N reached the highest values.The main corrosion products were α-FeOOH(needle-like and lamellar),CaCO_(3)(granular)and Fe_(3)O_(4)(spherical).

关 键 词：给水铸铁管道 微生物腐蚀 硝酸盐还原菌 铁释放 

分 类 号：TU991[建筑科学—市政工程]