污水环境中生物膜与混凝土防护涂层的交互作用  

Mutual Effect between the Biofilm and Concrete Protective Coatings in Sewage Environment

作　　者：孔丽娟[1,2] 梁增蕴 方珺 魏薇 张世武 李元元 KONG Li-juan;LIANG Zeng-yun;FANG Jun;WEI Wei;ZHANG Shi-wu;LI Yuan-yuan(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Materials Science and Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Drainage pipe protection center of Shijiazhuang,Shijiazhuang 050011,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]石家庄铁道大学材料科学与工程学院,石家庄050043 [3]石家庄市排水管护中心,石家庄050011

出　　处：《表面技术》2022年第8期342-352,共11页Surface Technology

基　　金：国家自然科学基金(51878421);河北省自然科学基金(E2019210284)。

摘　　要：目的了解污水环境中生物膜在涂层表面的生长规律及其对混凝土腐蚀的作用机制。方法分别选用无机惰性涂层(IIC)、无机杀菌涂层(IBC)和有机涂层(OC)应用于混凝土表面,并基于生物膜生长曲线的测定,建立其生长模型,同时采用激光共聚焦扫描显微镜(CLSM)观察涂层表面生物膜内微生物群落结构,最后通过测定有无生物膜试样的质量变化和表面粗糙度,探究污水中生物膜对涂层混凝土的影响。结果无涂层混凝土试件(UCS)上形成的生物膜量最多,其次是IIC、IBC和OC。除杀菌涂层IBC外,生物膜生长基本遵循表面粗糙度原则,即试样表面越粗糙,附着生物膜越多。与混凝土相比,涂层表面生物膜的附着阶段更长,而生长阶段则较短。污水腐蚀90 d后,试件UCS表面的生物膜作用系数最高,为0.67,其次是IIC,为0.51,而试样IBC和OC的生物膜作用系数仅为0.22和0.25。结论试样表面形成的厚而密的生物膜可作为物理屏障,降低污水的渗透性,不过涂层的杀菌性和光滑表面导致形成的生物膜薄而多孔,从而降低了生物膜的保护作用。The paper aims to enrich our understanding of the growth law of biofilm and its influence mechanism on the deterioration of concrete in sewage environment.Three types of coatings,namely,inorganic inert coating(IIC),inorganic bactericidal coating(IBC)and organic coating(OC)were applied onto concrete surface,the growth model of biofilm was established based on the measurement of its growth curve,and the microbial community structure of biofilm was observed through confocal laser scanning microscope(CLSM).And then the effect of biofilm on the coated concrete was investigated by measuring the mass change and surface roughness of specimens with and without biofilm.The results show that the mass of biofilm developed on uncoated concrete specimen(UCS)is the highest,followed by IIC,IBC and OC.The growth of biofilm basically follows the surface roughness rule that the rougher the carrier surface is,the more biofilm will be attached,except for IBC.Although the surface roughness of IBC is greater than that of IIC,the biofilm attached on it is less,which indicates that the biological adaptability of the carrier can also affect the growth of biofilm on it.Moreover,compared with that on concrete surface,the attachment stage of biofilm on coating surfaces is longer,whereas its growth stage is shorter.Formula m_(f)=m_(fe)(1-αe^(-at))can be used as the mathematical model to calculate the mass of biofilm in the attachment stage,and for the growth stage,it also conforms to the Monod equation,that is,the biofilm quality increases linearly with time.As the biofilm can act as a protective layer to a certain degree,the biofilm action coefficient was proposed based on the difference of surface roughness between the samples without and with biofilm attachment after corrosion,and the higher the coefficient is,the stronger the protective effect of biofilm on mortar will be.After 90 days of sewage corrosion,both the mass loss and surface roughness of the specimens without biofilm attachment were higher than that with biofilm attachment,and

关 键 词：表面涂层 混凝土 污水腐蚀 粗糙度 生物膜生长 

分 类 号：TU528.2[建筑科学—建筑技术科学]