Physiochemical and biological characteristics of fouling on landfill leachate treatment systems surface  

作　　者：Zhourui Gong Shu Yang Rui Zhang Yangqing Wang Xiaoqing Wu Liyan Song 

机构地区：[1]School of resources and environmental engineering,Anhui University,Hefei 230601,China [2]Anhui Shengjin Lake Wetland Ecology National Long-term Scientific Research Base,Dongzhi 247230,China [3]Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China [4]Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China [5]Xing Lu Huan Jing Co.LTD.,Luzhou 646000,China

出　　处：《Journal of Environmental Sciences》2024年第1期59-71,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.52000016 and 51578642);the Major program of Science and Technology of Anhui Province (No.202103a07020016)。

摘　　要：Fouling of landfill leachate,a biofilm formation process on the surface of the collection system,migration pipeline and treatment system causes low efficiency of leachate transportation and treatment and increases cost for maintenance of those facilities.In addition,landfill leachate fouling might accumulate pathogens and antibiotic resistance genes(ARGs),posing threats to the environment.Characterization of the landfill leachate fouling and its associated environmental behavior is essential for the management of fouling.In this study,physicochemical and biological properties of landfill leachate fouling and the possible accumulation capacity of pathogens and ARGs were investigated in nitrification(aerobic condition)and denitrification(anaerobic condition)process during landfill leachate biological treatment,respectively.Results show that microbial(bacterial,archaeal,eukaryotic,and viral)community structure and function(carbon fixation,methanogenesis,nitrification and denitrification)differed in fouling under aerobic and anaerobic conditions,driven by the supplemental leachate water quality.Aerobic fouling had a higher abundance of nitrification and denitrification functional genes,while anaerobic fouling harbored a higher abundance of carbon fixation and methanogenesis genes.Both forms of leachate fouling had a higher abundance of pathogens and ARGs than the associated leachate,suggesting the accumulation capacity of fouling on biotic pollutants.Specifically,aerobic fouling harbored three orders of magnitude higher multidrug resistance genes mex D than its associated leachate.This finding provides fundamental knowledge on the biological properties of leachate fouling and suggests that leachate fouling might harbor significant pathogens and ARGs.

关 键 词：Landfill leachate fouling BIOFILM MICROBIOME Carbon and nitrogen cycle PATHOGENS Antibiotic resistance genes 

分 类 号：X703[环境科学与工程—环境工程]