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Continuous Phosphorus Recovery by Heterogeneous Nucleation: Challenges in Solid-Liquid Separation

Förster, Eva; Illies, Sarah; Anlauf, Harald; Nirschl, Hermann

Abstract: Phosphorous (P) is an essential natural resource of limited availability. Furthermore, many countries, including Germany, have no access to P sources and are entirely dependent on P imports to cover their demand. Therefore the recovery of P is a topic of distinct importance. In the past decades a manifold of processes for P recovery from wastewater have been developed. The P-RoC-process (Phosphorus Recovery by Crystallization) is a technique developed by Competence Center for Material Moisture (CMM), KIT, based on crystallization of P on a Calcium-Silicate-Hydrate (CSH) substrate [1]. The feasibility of the approach has been shown on the lab scale and also as a semi-batch process on the pilot scale in a side stream of a municipal sewage plant. For full implementation of the process, a transition from semi-batch to a continuous process is desirable. However a crucial question still to be solved is the removal of the P-loaded substrate from the process. Challenges for the CSH separation are the particle size distribution that will result in a distribution in reaction kinetics and thus a difference in P coverage with particle size. Additionally comminution of the highly porous particles might also be an issue. The task at hand thus requires a separation unit that allows for classification as well as for separation of the particles. In this paper we present how the continuous classification and separation of P-loaded CSH is solved by using a hydrocyclone. For this cause an experimental setup was developed in order to realize the continuous P crystallization on CSH substrate and removal of CSH on the pilot scale.

Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Proceedingsbeitrag
Jahr 2016
Sprache Englisch
Identifikator DOI(KIT): 10.5445/IR/1000063415
URN: urn:nbn:de:swb:90-634152
KITopen ID: 1000063415
Erschienen in Filtech 2016, 11. - 13. Oktober 2016, Köln [L11 / F1- Short Oral + Poster Presentations - Slurry Pretreatment - Fractionation and Sorting]
Schlagworte Classification, Hydrocyclone, Phosphate, Scale-up, Solid-Liquid-Separation, Wastewater
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