Efficient removal of phosphonate and phosphorus recovery from reverse osmosis concentrate using electroactive membrane reactor

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Resources Conservation and Recycling Pub Date : 2025-01-24 DOI:10.1016/j.resconrec.2025.108148

Lehui Ren , Yang Li , Wei Shi , Yao Qu , Xueye Wang , Zhichao Wu , Zhiwei Wang

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Abstract

Phosphonate antiscalants, commonly found in reverse osmosis (RO) concentrates, significantly contribute to eutrophication. Conventional advanced oxidation processes (AOPs) can only convert phosphonates into ortho-phosphorus (ortho-P), necessitating a secondary step for phosphorus removal. To overcome this limitation, we developed a single-step electroactive membrane reactor (EMR) system for phosphonate removal and simultaneous phosphorus recovery. In this system, the phosphonate was oxidized to orthophosphate (ortho-P) by singlet oxygen (¹O₂) generated at the Pd/Ti REM. Subsequently, calcium phosphate (CaP) precipitates were formed at the cathodic membrane interface through reaction with calcium ions. Under conditions of 5 mA/cm² current density and 0.5 mL/min flow rate, the EMR system achieved 85 % degradation efficiency of phosphonates and 80 % recovery efficiency of phosphorus, with an energy consumption of 0.019 kWh/g-P. Overall, this EMR technology offers significant potential for the efficient removal of phosphonate antiscalants from RO concentrates, providing a novel approach to sustainable phosphorus management.

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.