Department of Civil, Urban, Earth, and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
Bioresour Technol. 2024 Feb;394:130298. doi: 10.1016/j.biortech.2023.130298. Epub 2024 Jan 4.
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 CO solvent. Spent urine after biogas upgrading (SU), with neutralized pH and increased conductivity resulting from CO 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) 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, 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.
本研究探讨了从人尿中电化学回收营养物质与沼气升级相结合的方法。富含氨氮（≥300mM）且碱性（≥pH9）的水解尿液（HU）是一种很有前途的 CO 溶剂替代物。经过沼气升级后的尿液（SU）具有中性 pH 值和因 CO 吸收而增加的电导率，有利于通过电浓缩回收总氨氮（TAN）。使用不同施加电流密度（13-77A/m）的合成尿液进行的实验表明，HU 和 SU 都能有效回收 TAN，电流密度越高浓缩倍数越大（2.1-3.3 倍，1.2-1.8M TAN 浓缩液）。使用优化后的 52A/m 电流密度对实际尿液进行的验证实验，考虑到能量消耗，与 HU 相比，使用 SU（3.7 倍浓缩，1.6M TAN 浓缩液；适合液体肥料）进行 TAN 回收具有更高的效率和能源效率。这些发现为最大限度地提高尿液的附加值提供了一种先进的策略，有助于实现循环经济。
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