摘要
采用三维白光干涉形貌仪观测不同流速下附着于PE管内的生物膜表面形貌,分析再生水滴灌条件下不同流速对滴灌系统内生物膜表面形貌的影响。结果表明:中流速区,生物膜表面固体颗粒物质多,表面粗糙,生物膜较厚;高流速区,生物膜表面光滑,生物膜较薄;生物膜平均厚度与流速的关系符合指数规律,流速为0.22 m/s,生物膜平均厚度达到最大值。流速大于0.90 m/s的生物膜生长速率随着流速增加而下降快,生物膜易脱落,且水力剪切力力也急增,清洗滴灌系统的流速应大于0.90 m/s。
3-D topography of white light interference instrument was used to observe the surface topography of biofilm under different velocity rates in PE pipe,and the impact of velocity rate and surface topography of biofilm was analyzed.The results showed that more solid particulate was on biofilm surface with roughness in the middle-velocity zone.In the high-velocity zone,biofilm surface was smoother and biofilm＇s thickness was thinner.The relationship between the average thicknesses of biofilm with velocity rate agreed to the exponential law whose maxima velocity rate is 0.22m/s.Under the condition of velocity rate is greater than 0.90m/s,the growth rate of biofilm was decreased faster with the increase of velocity rate,and more biofilm fell off,and hydraulic shear stress force increased rapidly,so cleaning velocity rate of the drip irrigation system should be larger than 0.90m/s.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2010年第5期36-41,63,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(50779068)
长江学者和创新团队发展计划项目(2RTD657)
关键词
生物膜
滴灌
再生水
堵塞
表面形貌
Biofilm
Drip irrigation
Reclaimed water
Clogging
Surface topography
