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

IF 10.9 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Resources Conservation and Recycling Pub Date : 2025-04-01 Epub 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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电活性膜反应器反渗透浓缩液中磷酸盐的高效去除及磷的回收

磷酸盐抗垢剂，通常在反渗透（RO）浓缩物中发现，显着促进富营养化。传统的高级氧化工艺（AOPs）只能将磷酸盐转化为邻磷（orthoo -p），需要二级步骤来去除磷。为了克服这一限制，我们开发了一种单步电活性膜反应器（EMR）系统，用于去除磷酸盐和同时回收磷。在该体系中，Pd/Ti REM生成的单线态氧（1O2）将磷酸盐氧化为正磷酸盐（orthp），随后与钙离子反应在阴极膜界面形成磷酸钙（CaP）沉淀。在电流密度为5 mA/cm²、流速为0.5 mL/min的条件下，EMR系统对磷酸盐的降解效率为85%，对磷的回收率为80%，能耗为0.019 kWh/g-P。总的来说，这种EMR技术为从反渗透精矿中有效去除膦酸盐抗垢剂提供了巨大的潜力，为可持续的磷管理提供了一种新的方法。

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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.