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Biofilm structure and its influence on clogging in drip irrigation emitters distributing reclaimed wastewater

Journal of Environmental Sciences 2009年第6期21卷 834-841页

作者： YAN Dazhuang BAI Zhihui mike rowan GU Likun Ren Shumei YANG Peiling College of Water Conservancy and Civil Engineering China Agricultural University Beijing 100083 China Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Department of Food Agricultural and Biological Engineering the Ohio State University Columbus Ohio 43210 USA Qingdao Institute of Biomass Energy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266071 China

Using reclaimed wastewater for crop irrigation is a practical alternative to discharge wastewater treatment plant effluents into surface ***,biofouling has been identified as a major contributor to emitter clogging in drip irrigation systems distributing reclaimed *** is known about the biofilm structure and its influence on clogging in the drip emitter flow *** study was first to investigate the microbial characteristics of mature biofilms present in the emitters and the effect of flow path structures on the biofilm microbial *** analysis of biofilm matrix structure using a scanning electron microscopy（SEM） revealed that particles in the matrix of the biofilm coupled extracellular polysaccharides（EPS） and formed sediment in the emitter flow *** of biofilm mass including protein,polysaccharide,and phospholipid fatty acids（PLFAs） showed that emitter flow path style influenced biofilm community structure and *** correlations of biofilm biomass and discharge reduction after 360 h irrigation were computed and suggest that PFLAs provide the best correlation ***,the emitter with the unsymmetrical dentate structure and shorter flow path（Emitter C） had the best anti-clogging *** optimizing the dentate structure,the internal flow pattern within the flow path could be enhanced as an important method to control the biofilm within emitter flow *** study established electron microscope techniques and biochemical microbial analysis methods that may provide a framework for future emitter biofilm studies.

关键词： emitter clogging, drip irrigation biofilm microbial community phospholipid fatty acid reclaimed wastewater scanningelectron microscopy

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