@inproceedings{RosenbergerGienau2019,
  author    = {Sandra Rosenberger and Tobias Gienau},
  title     = {Optimised Nutrient Recovery from Biogas Digestate by Solid/Liquid Separation and Membrane Treatment},
  series = {Proceedings 3rd IWA Resource Recovery Conference},
  publisher = {International Water Association},
  url       = {https://nbn-resolving.org/urn:nbn:de:bsz:959-opus-14504},
  year      = {2019},
  abstract  = {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.},
  language  = {en}
}