| Title |
Electrochemical recovery of nutrients from human urine coupled with biogas upgrading |
| ID_Doc |
7791 |
| Authors |
Kim, H; Park, H; Kim, K; Lee, C |
| Title |
Electrochemical recovery of nutrients from human urine coupled with biogas upgrading |
| Year |
2024 |
| Published |
|
| DOI |
10.1016/j.biortech.2023.130298 |
| Abstract |
This study explored the coupling of electrochemical nutrient recovery from human urine with biogas upgrading. Ammonia nitrogen-rich (>= 300 mM) and alkaline (>= pH 9) hydrolyzed urine (HU) is a promising alternative CO2 solvent. Spent urine after biogas upgrading (SU), with neutralized pH and increased conductivity resulting from CO2 absorption, is advantageous over HU for recovering total ammonia nitrogen (TAN) through electro-concentration. Experiments using synthetic urine at varying applied current densities (13-77 A/m(2)) demonstrated effective TAN recovery from both HU and SU, with greater enrichment factors at higher currents (2.1-3.3-fold, 1.2-1.8 M TAN concentrate). Validation experiments using real urine at the optimized current density of 52 A/m(2), considering energy consumption, exhibited superior TAN recovery and energy efficiency when using SU (3.7-fold enrichment, 1.6 M TAN concentrate; suitable for liquid fertilizer) compared to HU. These findings offer an advanced strategy for maximizing urine valorization, contributing to a circular economy. |
| Author Keywords |
Ammonia nitrogen; Carbon dioxide absorption; Electro-concentration; Nutrient recovery; Source -separated urine |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001155256000001 |
| WoS Category |
Agricultural Engineering; Biotechnology & Applied Microbiology; Energy & Fuels |
| Research Area |
Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels |
| PDF |
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