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Open AccessArticle

Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

1
BASF Polyurethanes GmbH, Elastogranstraße 60, 49448 Lemforde, Germany
2
Faculty of Engineering and Computer Sciences, Osnabrück University of Applied Sciences, Albrechtstraße 30, 49076 Osnabruck, Germany
3
Chemical & Process Engineering, Technische Universität Berlin, Str. des 17. Juni 135, FH 6-1, 10623 Berlin, Germany
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(4), 64; https://doi.org/10.3390/membranes10040064
Received: 6 March 2020 / Revised: 27 March 2020 / Accepted: 27 March 2020 / Published: 4 April 2020
(This article belongs to the Special Issue Membrane Technologies for Nutrient Recovery)
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. View Full-Text
Keywords: nutrient recovery; biological suspension; ultrafiltration; ozone treatment; rheology; membrane performance nutrient recovery; biological suspension; ultrafiltration; ozone treatment; rheology; membrane performance
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MDPI and ACS Style

Gienau, T.; Ehrmanntraut, A.; Kraume, M.; Rosenberger, S. Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate. Membranes 2020, 10, 64.

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