Abstract：
Microbial community biofilm exists in the household drinking water system and would pose threat to water quality. This paper explored biofilm formation and chlorination resistance of ten dual-species biofilms in three typical household pipes (stainless steel (SS), polypropylene random (PPR), and copper), and investigated the role of interspecific interaction. Biofilm biomass was lowest in copper pipes and highest in PPR pipes. A synergistic or neutralistic relationship between bacteria was evident in most biofilms formed in SS pipes, whereas four groups displayed a competitive relationship in biofilms formed in copper pipe. Chlorine resistance of biofilms was better in SS pipes and worse in copper pipes. It may be helped by interspecific relationships, but was more dependent on bacteria and resistance mechanisms such as more stable extracellular polymeric substance. The corrosion sites may also protect bacteria from chlorination. The findings provide useful insights for microbial control strategies in household drinking water systems.
摘要：
家庭饮用水系统中存在微生物群落生物膜，会对水质造成威胁。本文探讨了三种典型家用管道（不锈钢（SS），无规聚丙烯(PPR),和铜），并研究了种间相互作用的作用。生物膜生物量在铜管中最低，在PPR管中最高。在SS管道中形成的大多数生物膜中，细菌之间存在协同或中立的关系。而四组在铜管中形成的生物膜中表现出竞争关系。SS管生物膜的耐氯性较好，铜管生物膜的耐氯性较差。它可能会受到种间关系的帮助，但更依赖于细菌和抗性机制如更稳定的胞外聚合物。腐蚀位点还可以保护细菌免受氯化。这些发现为家庭饮用水系统中的微生物控制策略提供了有用的见解。
