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Effects of average velocity on the growth and surface topography of biofilms attached to the reclaimed wastewater drip irrigation system laterals

机译:平均速度对再生废水滴灌系统支管上附着的生物膜生长和表面形貌的影响

摘要

Emitter clogging, a phenomenon commonly seen in reclaimed wastewater drip irrigation systems, is a severe obstacle to the wide applications and popularization of the irrigation technology. Some experiments showed that the emitter clogging was tightly related to biofilms formation attached to the irrigation system. In this paper, two types of wastewaters reclaimed respectively by fluidized-bed reactor (FBR) process and biological aerated filter (BAF) process were chosen as the experiment objects and then the effects of the average velocity on the growth and topography of biofilms attached to the irrigation laterals were studied. The parameters of biofilms reached their maximal values at a critical velocity of 0.45 m/s. The formation of biofilms was primarily controlled by the transport of the nutrients and suspended particles within the laterals when the average velocity is below the critical velocity, whereas it was primarily controlled by the hydraulic shear force when above the critical velocity. The main mechanism for emitter clogging was that the biofilms detached from laterals accumulated and grew at the inlets and outlets of emitters. A similar variation pattern was observed for both reclaimed wastewaters. However, the growth of biofilms for BAF process was more affected by the shear force than that for FBR process, since the nutrients and suspended particles for BAF were larger than those for FBR.
机译:排放物堵塞是再生废水滴灌系统中常见的一种现象,严重阻碍了灌溉技术的广泛应用和普及。一些实验表明,发射器堵塞与灌溉系统上附着的生物膜形成密切相关。本文选择流化床反应器(FBR)和曝气生物滤池(BAF)分别回收的两种类型的废水作为实验对象,然后研究了平均速度对附着在其上的生物膜的生长和形貌的影响。研究了灌溉支管。生物膜的参数以0.45 m / s的临界速度达到最大值。当平均速度低于临界速度时,生物膜的形成主要由营养物质和悬浮颗粒在侧井中的传输控制,而当临界速度以上时,其主要由水力剪切力控制。发射器堵塞的主要机制是,与生物膜分离的生物膜在发射器的入口和出口处积累并生长。两种再生废水均观察到类似的变化模式。但是,与FBR工艺相比,BAF工艺的生物膜生长受剪切力的影响更大,因为BAF的营养物和悬浮颗粒比FBR大。

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