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Investigation of settleability of biologically produced solids and biofilm morphology in moving bed bioreactors (MBBRs)

机译:研究移动床生物反应器(MBBR)中生物产生的固体的沉降性和生物膜形态

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摘要

The objective of this work is to investigate the effects of surface area loading rates (SALRs) and hydraulic retention times (HRTs) in moving bed bioreactor (MBBR) systems on the morphology and thickness of the attached biofilm along with subsequent effects on particle size distribution and the settling characteristics of the biologically produced solids. The morphology of biofilm attached to the MBBR carriers changed from a porous biofilm to a biofilm with a more filamentous structure throughout the study at various operating conditions without observable correlation with SALR and HRT. Although, biofilm morphology did not demonstrate an effect on the biologically produced solids observed in this study, the thinnest biofirms resulted in the highest concentration of solids in the effluent. Furthermore, the particle size distribution analysis demonstrated that both higher SALRs and longer HRTs resulted in a shift towards larger-sized particles. Increases in SALR and HRT, independent of each other, also showed increases in effluent solid concentration and lower settleability of the solids.
机译:这项工作的目的是研究移动床生物反应器(MBBR)系统中的表面积负载率(SALR)和水力停留时间(HRT)对附着的生物膜的形态和厚度的影响,以及随后对粒径分布的影响以及生物产生的固体的沉降特性。在整个研究过程中,在各种操作条件下,附着在MBBR载体上的生物膜的形态从多孔生物膜变为具有更多丝状结构的生物膜,而与SALR和HRT没有明显的相关性。尽管生物膜的形态没有证明对本研究中观察到的生物产生的固体有影响,但最薄的生物公司却导致废水中固体的浓度最高。此外,粒度分布分析表明,较高的SALR和较长的HRT都会导致向较大尺寸颗粒的转移。 SALR和HRT的增加(彼此独立)也显示出废水中固体物浓度增加和固体物沉降性降低。

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