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Optimised Nutrient Recovery from Biogas Digestate by Solid/Liquid Separation and Membrane Treatment

  • Anaerobic digestion products of agricultural biogas plants are characterised by high nitrogen, phosphorus, and potassium content. In three scale-up steps, a membrane based digestate treatment process of solid-liquid-separation, ultrafiltration, and reverse osmosis for nutrient recovery was investigated. Lab-scale trials delivered a very good understanding of fluid properties and subsequent ultrafiltration performance, which is the limiting process step in terms of energy demand and operation costs. In semi-technical experiments, optimisation, and design parameters were developed, which were subsequently applied to pilot-scale tests at two full-scale biogas plants. The process optimisation resulted in 50 % energy reduction of the ultrafiltration step. About 36 % of the sludge volume was recovered as dischargeable water, 20 % as solid N/P-fertiliser, and 44 % as liquid N/K-fertiliser.

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Author:Sandra Rosenberger, Tobias Gienau
Title (English):Optimised Nutrient Recovery from Biogas Digestate by Solid/Liquid Separation and Membrane Treatment
Parent Title (English):Proceedings 3rd IWA Resource Recovery Conference
Publisher:International Water Association
Document Type:Conference Proceeding
Year of Completion:2019
Release Date:2019/09/27
3rd IWA Resource Recovery Conference, Venice, Italy, 08.-12.09.2019
Faculties:Fakultät IuI
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 624 Ingenieurbau und Umwelttechnik
Review Status:Veröffentlichte Fassung/Verlagsversion