Heterogeneous diffusion in aerobic granular sludge
| Autor: | Joseph D. Seymour, Lenno van den Berg, Merle de Kreuk, Sarah L. Codd, Catherine M. Kirkland, Mark C.M. van Loosdrecht |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Mass transport granule structure chemistry.chemical_element Bioengineering Kinetic energy 01 natural sciences Applied Microbiology and Biotechnology Waste Disposal Fluid Article Water Purification Engineering Science of Biological Systems 03 medical and health sciences ARTICLES 010608 biotechnology Mass transfer aerobic granular sludge Sewage Granule (cell biology) Significant difference diffusion Nitrogen Aerobiosis NMR 030104 developmental biology chemistry Chemical engineering Free water Sewage treatment heterogeneity Biotechnology |
| Zdroj: | Biotechnology and Bioengineering Biotechnology and Bioengineering, 117(12) |
| ISSN: | 0006-3592 |
| DOI: | 10.1002/bit.27522 |
| Popis: | Aerobic granular sludge (AGS) technology allows simultaneous nitrogen, phosphorus, and carbon removal in compact wastewater treatment processes. To operate, design, and model AGS reactors, it is essential to properly understand the diffusive transport within the granules. In this study, diffusive mass transfer within full‐scale and lab‐scale AGS was characterized with nuclear magnetic resonance (NMR) methods. Self‐diffusion coefficients of water inside the granules were determined with pulsed‐field gradient NMR, while the granule structure was visualized with NMR imaging. A reaction‐diffusion granule‐scale model was set up to evaluate the impact of heterogeneous diffusion on granule performance. The self‐diffusion coefficient of water in AGS was ∼70% of the self‐diffusion coefficient of free water. There was no significant difference between self‐diffusion in AGS from full‐scale treatment plants and from lab‐scale reactors. The results of the model showed that diffusional heterogeneity did not lead to a major change of flux into the granule ( Aerobic granules are heterogeneous structures, but the impact of heterogeneity on diffusive mass transport is not well understood. Van den Berg and coworkers used a granule‐scale reaction‐diffusion model to test the impact of various modes of heterogeneous diffusion on granule performance. Surprisingly, the impact of heterogeneous diffusion was only minor ( |
| Databáze: | OpenAIRE |
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