Effect of sludge retention time on the biological performance of anaerobic membrane bioreactors treating corn-to-ethanol thin stillage with high lipid content
| Autor: | Jules B. van Lier, Barry Heffernan, Recep Kaan Dereli, Frank P. van der Zee, Aurelie Grelot |
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| Rok vydání: | 2013 |
| Předmět: |
Environmental Engineering
Time Factors Biomass Wastewater Zea mays Adsorption Bioreactors Bioreactor Chemical Precipitation Magnesium Anaerobiosis Waste Management and Disposal Effluent Water Science and Technology Civil and Structural Engineering Biological Oxygen Demand Analysis Chromatography Ethanol Sewage Chemistry Ecological Modeling Fatty Acids Membranes Artificial Pollution Oxygen Membrane Biodegradation Environmental Fermentation Calcium Stillage Methane Biotechnology |
| Zdroj: | Water research. 49 |
| ISSN: | 1879-2448 |
| Popis: | The potential of anaerobic membrane bioreactors (AnMBRs) for the treatment of lipid rich corn-to-ethanol thin stillage was investigated at three different sludge retention times (SRT), i.e. 20, 30 and 50 days. The membrane assisted biomass retention in AnMBRs provided an excellent solution to sludge washout problems reported for the treatment of lipid rich wastewaters by granular sludge bed reactors. The AnMBRs achieved high COD removal efficiencies up to 99% and excellent effluent quality. Although higher organic loading rates (OLRs) up to 8.0 kg COD m(-3) d(-1) could be applied to the reactors operated at shorter SRTs, better biological degradation efficiencies, i.e. up to 83%, was achieved at increased SRTs. Severe long chain fatty acid (LCFA) inhibition was observed at 50 days SRT, possibly caused by the extensive dissolution of LCFA in the reactor broth, inhibiting the methanogenic biomass. Physicochemical mechanisms such as precipitation with divalent cations and adsorption on the sludge played an important role in the occurrence of LCFA removal, conversion, and inhibition. |
| Databáze: | OpenAIRE |
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