Physicochemical methods for biofilm removal allow for control of biofilm retention time in a high rate MBBR
| Autor: | Alessandro di Biase, Jan A. Oleszkiewicz, Tanner R. Devlin, Maciej S. Kowalski |
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| Rok vydání: | 2020 |
| Předmět: |
Hydraulic retention time
Surface Properties Side stream 0208 environmental biotechnology Mixing (process engineering) 02 engineering and technology Wastewater 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Bioreactors Extracellular polymeric substance Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Chemistry Moving bed biofilm reactor Biofilm General Medicine biochemical phenomena metabolism and nutrition Carbon 020801 environmental engineering Chemical engineering Solubilization Biofilms Retention time |
| Zdroj: | Environmental Technology. 43:1593-1602 |
| ISSN: | 1479-487X 0959-3330 |
| DOI: | 10.1080/09593330.2020.1843078 |
| Popis: | Controlling biofilm retention time in moving bed biofilm reactor (MBBR) and maintaining its performance for A-stage carbon redirection requires a reliable method to use as side stream biocarriers treatment. This paper investigates biofilm detachment and residual biofilm activity under multiple physicochemical treatment scenarios aiming to provide an applicable technique for control of biofilm retention time. Different mixing intensities (i.e. 30-120 rpm), filling fractions (i.e. 20%-100%), and pH (i.e. 2-12) were evaluated. Two continuously operating MBBRs were subjected to pH shocks of 2 and 12 to evaluate the impact of residual acidic or alkaline compounds on performance. The highest solids detachment (i.e. 70 ± 5%) was found in alkaline conditions and independent of mixing intensity and filling fraction. Biofilm detachment test revealed that alkaline shock produced higher detachment levels in a longer exposure time when compared to acidic conditions. The kinetic tests revealed 60% and 90% of the residual biofilm activity was lost at pH 12 and 2. The continuously operating MBBRs subjected to pH shocks of 2 and 12 demonstrated a 50% loss of soluble COD removal capability within one hydraulic retention time. Extracellular polymeric substances changes in its structure and surface properties influencing the degree of biofilm detachment and its solubilization properties leading to differences in biofilm resilience. The findings have shown that by applying a side stream alkali treatment it could be possible to control biofilm retention time ensuring its detachment up to 70% and a reduced impact on the residual biofilm activity returning to the reactor. |
| Databáze: | OpenAIRE |
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