Weisz Liad, Reif Daniela, Weilguni Sascha, Parravicini Vanessa, Saracevic Ernis, Krampe Jörg, Kreuzinger Norbert
Institute of Water Quality and Resource Management, TU Wien, Vienna, Austria.
Institute of Water Quality and Resource Management, TU Wien, Vienna, Austria.
Sci Total Environ. 2024 Dec 1;954:176699. doi: 10.1016/j.scitotenv.2024.176699. Epub 2024 Oct 2.
Electrodialysis (ED) is a cost-effective membrane technology used is a variety of fields for desalination and concentration. This feasibility study explores the potential of ED as an NH-N recovery technology from anaerobic digestate liquor (ADL), and the use of the concentrate as a nitrogen source in an industrial wastewater treatment plant (WWTP). Three neighboring WWTPs were the focus of this study: Two municipal WWTPs A and B, operating anaerobic sludge stabilization, and a pulp & paper WWTP C, utilizing urea as a nitrogen source. Two-stage bench-scale experiments with the municipal ADL from WWTP A and WWTP B were conducted, and performance indicators were determined. A concentration of approximately 10 g NH-N/L and 15 g NH-N/L was obtained in stages 1 and 2, respectively. The NH-N removal was above 85 % in all experiment, while recovery varied between 25 and 95 %. The specific energy consumption (SEC) was on average 12.9 kWh/kg NH-N. Moreover, mass and energy balances in a model WWTP demonstrated that an ED side-stream treatment for NH-N removal coupled with microfiltration (MF) pre-treatment results in a net energy gain, also without the added benefit of the ED concentrate as a nitrogen source.
电渗析（ED）是一种具有成本效益的膜技术，用于各种脱盐和浓缩领域。本可行性研究探讨了电渗析作为从厌氧消化液（ADL）中回收氨氮（NH-N）的技术潜力，以及将浓缩液用作工业废水处理厂（WWTP）氮源的可能性。本研究聚焦于三个相邻的污水处理厂：两个运行厌氧污泥稳定化的城市污水处理厂A和B，以及一个使用尿素作为氮源的造纸污水处理厂C。对污水处理厂A和B的城市厌氧消化液进行了两级实验室规模实验，并确定了性能指标。在第1阶段和第2阶段分别获得了约10 g NH-N/L和15 g NH-N/L的浓度。在所有实验中，氨氮去除率均高于85%，回收率在25%至95%之间变化。比能耗（SEC）平均为12.9 kWh/kg NH-N。此外，在一个模型污水处理厂中的质量和能量平衡表明，采用微滤（MF）预处理与电渗析侧流处理相结合去除氨氮可实现净能量增益，即便不考虑电渗析浓缩液作为氮源带来的额外益处。
