摘要
采用模拟管网环境的生物膜培养反应器结合物化表征和微生物学分析方法,探讨了供水系统中5种常见微塑料上氨氧化微生物定植过程及其作为潜在硝化生态位的可能性.结果表明,氯化和微生物的定植作用导致微塑料结晶度增加并产生羰基、羟基等亲水基团.微塑料上的氨氧化微生物amo A功能基因丰度范围在(1.54±0.02)×10^(4)~(3.07±0.64)×10^(10)copies/g.在大多数情况下,完全氨氧化菌(Comammox)在微塑料上占据优势地位,仅在氯化处理42d的5种微塑料上发现耐氯性较强的氨氧化古菌(AOA)处于优势地位.原始微塑料(未氯化)上氨氧化微生物总丰度与微塑料的结晶度呈正相关,并在结晶度较高的PE和PP微塑料上表现得尤为明显.氯化处理后该相关性不复存在.微塑料上定植氨氧化微生物的多样性分析表明原始微塑料上的AOA种类更接近土壤来源的AOA,而氯化处理后更接近水系AOA.
This study investigated the colonization process of ammonia-oxidizing microorganisms(AOMs)on five common types of microplastics(MPs)as well as the potential nitrification niches of MPs in water supply systems,with the methods of biofilm simulation reactors,physicochemical characterization of MPs and microbiological analysis techniques.The results indicated that chlorination and microbial colonization led to an increase in the crystallinity of microplastics and the formation of hydrophilic groups such as carbonyl and hydroxyl moieties.The abundances of amoA genes of AOMs on microplastics ranged from(1.54±0.02)×10 to(3.07±0.64)×10^(1)copies/g.Comammox was predominant on most of the microplastics.Ammonia-oxidizing archaea(AOA),which was highly chlorine-resistant,was found to be predominant on the MPs only after chlorination for 42days.The total abundance of AOMs exhibited a positive correlation with microplastic crystallinity on unchlorinated microplastics,which was particularly obvious on higher intrinsic crystallinity MPs,i.e.,polyethylene(PE)and polypropylene(PP).However,this correlation was not observed after chlorination treatment.Diversity analysis of AOMs colonizing on microplastics revealed that AOA on unchlorinated MPs were more closely related to soil-derived AOA.On the contrary,AOA on chlorinated MPs was more closely to aquatic AOA.
作者
牛佳
蒋志达
徐佳燕
许华诚
余健英
刘宪华
徐开钦
陈晓晨
NIU Jia;JIANG Zhi-da;XU Jia-yan;XU Hua-cheng;YU Jian-ying;LIU Xian-hua;XU Kai-qin;CHEN Xiao-chen(Innovation Center for Soil Remediation and Restoration Technologies,College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Engineering Research Center of Water Pollution Control and System Intelligence Technology,School of Ecological Environment and Urban Construction,Fujian University of Technology,Fuzhou 350118,China;Quanzhou Lanshen Environmental Protection Research Institute Co.Ltd.,Quanzhou 362000,China;Fujian Lanshen Environmental Protection Technology Co.Ltd.,Quanzhou 362000,China;The Second Geological Exploration Institute,China Metallurgical Geology Bureau,Fuzhou 350108,China;School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China)
出处
《中国环境科学》
北大核心
2025年第8期4628-4637,共10页
China Environmental Science
基金
国家自然科学基金资助项目(52000032,42377380)
福建省自然科学基金资助项目(2023J01933)。
