Small-scale membrane-based arsenic removal for decentralized applications–Developing a conceptual approach for future utilization

•Recent laboratory and pilot-scale trials for arsenic removal have been summarized.•Advantages on membrane technologies show feasibility for small-scale applications.•Treatment concept depends on hydrogeological conditions such as pH and Eh.•Strategies for safe disposal of arsenic waste sludge and c...

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Bibliographic Details
Published in:Water research (Oxford) 2021-05, Vol.196, p.116978, Article 116978
Main Authors: Cañas Kurz, Edgardo E., Hellriegel, Ulrich, Figoli, Alberto, Gabriele, Bartolo, Bundschuh, Jochen, Hoinkis, Jan
Format: Article
Language:English
Subjects:
Adsorption
Arsenate
Arsenic - analysis
Arsenic removal
Arsenite
Concentrate disposal
Drinking Water
Membrane technologies
Water Pollutants, Chemical - analysis
Water Purification
Water Supply
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Summary:•Recent laboratory and pilot-scale trials for arsenic removal have been summarized.•Advantages on membrane technologies show feasibility for small-scale applications.•Treatment concept depends on hydrogeological conditions such as pH and Eh.•Strategies for safe disposal of arsenic waste sludge and concentrates are reviewed. Various technologies are used for the treatment of arsenic (As) contaminated water, but only a few seem to be suitable for small-scale applications; these are mostly used in rural communities where the access to potable water is the most vulnerable. In this review paper, the salient advantages and most notable challenges of membrane-based technologies for the removal of arsenate As(V) and arsenite As(III) are evaluated and systematically compared to alternative technologies such as e.g. adsorption. A comparison of different scientific papers, case studies and pilot trials is used to discuss the most important aspects when evaluating As mitigation technologies, including the ability to comply with the stringent WHO drinking water guideline limit value of 10 µg/L As and the safe disposal of produced As-laden waste. The use of renewable energies such as solar power in small-scale (
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2021.116978