Number of the records: 1
Simultaneous urea and phosphate recovery from synthetic urine by electrochemical stabilization
- 1.
SYSNO ASEP 0574005 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Simultaneous urea and phosphate recovery from synthetic urine by electrochemical stabilization Author(s) Koók, L. (HU)
Nagy, K. B. (HU)
Nyiro-Kósa, I. (HU)
Kovács, S. (HU)
Žitka, Jan (UMCH-V) RID
Otmar, Miroslav (UMCH-V) RID, ORCID
Bakonyi, P. (HU)
Nemestóthy, N. (HU)
Bélafi-Bakó, K. (HU)Article number 699 Source Title Membranes. - : MDPI
Roč. 13, č. 8 (2023)Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords electrochemical pH modulation ; phosphate recovery ; urea stabilization Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 001055248300001 EID SCOPUS 85169021923 DOI 10.3390/membranes13080699 Annotation Urine is a widely available renewable source of nitrogen and phosphorous. The nitrogen in urine is present in the form of urea, which is rapidly hydrolyzed to ammonia and carbonic acid by the urease enzymes occurring in nature. In order to efficiently recover urea, the inhibition of urease must be done, usually by increasing the pH value above 11. This method, however, usually is based on external chemical dosing, limiting the sustainability of the process. In this work, the simultaneous recovery of urea and phosphorous from synthetic urine was aimed at by means of electrochemical pH modulation. Electrochemical cells were constructed and used for urea stabilization from synthetic urine by the in situ formation of OH- ions at the cathode. In addition, phosphorous precipitation with divalent cations (Ca2+, Mg2+) in the course of pH elevation was studied. Electrochemical cells equipped with commercial (Fumasep FKE) and developmental (PSEBS SU) cation exchange membranes (CEM) were used in this study to carry out urea stabilization and simultaneous P-recovery at an applied current density of 60 A m−2. The urea was successfully stabilized for a long time (more than 1 month at room temperature and nearly two months at 4 °C) at a pH of 11.5. In addition, >82% P-recovery could be achieved in the form of precipitate, which was identified as amorphous calcium magnesium phosphate (CMP) by using transmission electron microscopy (TEM).
Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2024 Electronic address https://www.mdpi.com/2077-0375/13/8/699
Number of the records: 1