Two-step double-chambered wastewater electrolysis to recover separated fractions of heavy metals and phosphate

IF 4.5 3区工程技术 Q1 WATER RESOURCES

Water Resources and Industry Pub Date : 2025-06-18 DOI:10.1016/j.wri.2025.100305

Lena Hahn , João Marcos Monteiro , Ulrich Kunz , Michael Sievers

引用次数: 0

Abstract

The separated recovery of heavy metals and phosphate through a two-step water electrolysis is investigated. The use of carbon-polymer composite cathode with non-sticking properties and a dimension-stable anode in two-chamber cells is investigated to treat original industrial wastewater from metal industry by minimal addition of salts to support process water recovery. The heavy metals and phosphates are precipitated as metal-hydroxides and magnesium/calcium-phosphates, respectively. For phosphate precipitation the addition of magnesium chloride, calcium oxide as well as a reverse osmosis (RO) concentrate of artificial water reservoir were investigated. The pH value in the first steps affects both the amount of heavy metals and phosphate precipitated and an optimal pH for the first step is found to increase the phosphate recovery at low heavy metal content. Moreover, the use of RO concentrate enables a chemical input free phosphate recovery.

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两步双室电解废水回收重金属和磷酸盐分离馏分

研究了两步水电解分离回收重金属和磷酸盐的工艺。研究了在双室电池中使用具有不粘接性能的碳-聚合物复合阴极和尺寸稳定的阳极，通过少量添加盐来处理金属工业的原始工业废水，以支持工艺水的回收。重金属和磷酸盐分别以金属氢氧化物和镁/磷酸钙的形式沉淀。研究了在人工水库中加入氯化镁、氧化钙和反渗透（RO）浓缩液来沉淀磷酸盐。第一步的pH值既影响重金属的析出量，也影响磷酸盐的析出量，在重金属含量较低的情况下，第一步的最佳pH值可以提高磷酸盐的回收率。此外，使用反渗透浓缩物可以实现化学输入的无磷酸盐回收。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Resources and Industry Social Sciences-Geography, Planning and Development

CiteScore

8.10

自引率

5.90%

发文量

审稿时长

75 days

期刊介绍： Water Resources and Industry moves research to innovation by focusing on the role industry plays in the exploitation, management and treatment of water resources. Different industries use radically different water resources in their production processes, while they produce, treat and dispose a wide variety of wastewater qualities. Depending on the geographical location of the facilities, the impact on the local resources will vary, pre-empting the applicability of one single approach. The aims and scope of the journal include: -Industrial water footprint assessment - an evaluation of tools and methodologies -What constitutes good corporate governance and policy and how to evaluate water-related risk -What constitutes good stakeholder collaboration and engagement -New technologies enabling companies to better manage water resources -Integration of water and energy and of water treatment and production processes in industry