Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-10212
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Main Title: Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate
Author(s): Gienau, Tobias
Ehrmanntraut, Artjom
Kraume, Matthias
Rosenberger, Sandra
Type: Article
Language Code: en
Abstract: Membrane filtration of biological suspensions is frequently limited by fouling. This mechanism is well understood for ultrafiltration of activated sludge in membrane bioreactors. A rather young application of ultrafiltration is the recovery of nutrients from anaerobic digestates, e.g., from agricultural biogas plants. A process chain of solid/liquid separation, ultrafiltration, and reverse osmoses separates the digestate into different products: an organic N-P-fertilizer (solid digestate), a recirculate (UF retentate), a liquid N-K-fertilizer (RO retentate) and water. Despite the preceding particle removal, high crossflow velocities are required in the ultrafiltration step to overcome fouling. This leads to high operation costs of the ultrafiltration step and often limits the economical application of the complete process chain. In this study, under-stoichiometric ozone treatment of the ultrafiltration feed stream is investigated. Ozone treatment reduced the biopolymer concentration and apparent viscosity of different digestate centrates. Permeabilities of centrate treated with ozone were higher than without ozone treatment. In a laboratory test rig and in a pilot plant operated at the site of two full scale biogas plants, ultrafiltration flux could be improved by 50–80% by ozonation. Nutrient concentrations in the fertilizer products were not affected by ozone treatment.
URI: https://depositonce.tu-berlin.de/handle/11303/11326
http://dx.doi.org/10.14279/depositonce-10212
Issue Date: 4-Apr-2020
Date Available: 11-Jun-2020
DDC Class: 660 Chemische Verfahrenstechnik
Subject(s): nutrient recovery
biological suspension
ultrafiltration
ozone treatment
rheology
membrane performance
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Membranes
Publisher: MDPI
Publisher Place: Basel
Volume: 10
Issue: 4
Article Number: 64
Publisher DOI: 10.3390/membranes10040064
EISSN: 2077-0375
Appears in Collections:FG Verfahrenstechnik » Publications

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