摘要
选取聚乙烯(PE)管、钢管和球墨铸铁管3种常见供水管材进行试验,采用改进式生物膜环形反应器培养管壁生物膜,考察不同管材对管壁生物膜生物量和群落组成特征的影响;开展余氯衰减试验,探究不同初始氯浓度下,管材对主体水余氯变化和有机物特性的影响。结果表明:3种管道内壁生物量大小排序为球墨铸铁管>钢管>PE管。管材对微生物群落组成特征存在着显著影响,PE管壁中放线菌纲占比高达64.44%,钢管和球墨铸铁管壁中α-变形菌纲和γ-变形菌纲为优势菌纲。管材和初始氯浓度对于管道水质稳定性具有重要作用,当初始氯浓度为0.5 mg/L时,各管材余氯衰减均过快,10 h内消耗完全;当初始氯浓度为1.0 mg/L时,PE管主体水中亲水性有机碳(CDOC)含量显著上升;当初始氯浓度为2.0 mg/L时,球墨铸铁管中余氯衰减速率是其他两种管材的2~3倍,且主体水中CDOC含量远高于PE管和钢管。
Biofilm attached on pipe wall was cultivated in a modified biofilm annular reactor to investigate the effects of different pipe materials(polyethylene,steel and ductile iron)on biomass and microbial community composition of the biofilm.Residual chlorine decay test was carried out to explore the influence of pipe material on the change of residual chlorine in bulk water and the characteristics of organic matter at different initial chlorine concentrations.The descending order of biomass in the inner wall of three kinds of pipes was ductile iron,steel and polyethylene.Pipe material had a significant effect on microbial community composition.The relative abundance of Actinobacteria accounted for 64.44%in polyethylene pipe wall,and Alphaproteobacteria and Gammaproteobacteria were the dominant classes in steel pipe and ductile iron pipe walls.Pipe material and initial chlorine concentration played an important role in the stability of pipe water quality.When the initial chlorine concentration was 0.5 mg/L,the residual chlorine in each pipe decayed rapidly and was completely consumed within 10 h.When the initial chlorine concentration was 1.0 mg/L,the concentration of hydrophilic organic carbon(CDOC)in the bulk water of polyethylene pipe increased significantly.When the initial chlorine concentration was2.0 mg/L,the decay rate of residual chlorine in ductile iron pipe was 2-3 times that of the other two kinds of pipe,and the concentration of CDOC in bulk water was much higher than that of polyethylene pipe and steel pipe.
作者
张心悦
周克梅
刘煜
林涛
ZHANG Xin-yue;ZHOU Ke-mei;LIU Yu;LIN Tao(College of Environment,Hohai University,Nanjing 210098,China;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes<Ministry of Education>,Hohai University,Nanjing 210098,China;Nanjing Water Group Co.Ltd.,Nanjing 210036,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2022年第9期44-51,共8页
China Water & Wastewater
基金
国家自然科学基金资助面上项目(51978238)
住房和城乡建设部研究开发项目(2020-K-036)。
关键词
供水管材
生物膜特性
余氯衰减
有机物特性
群落组成
water supply pipe material
biofilm characteristics
residual chlorine decay
organic matter characteristics
community composition
