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Removal of naturally occurring strontium by nanofiltration/reverse osmosis from groundwater

Cai, Y.-H.; Yang, X. J.; Schäfer, A. I.

Abstract:
Removal of naturally occurring strontium (Sr) from groundwater is vital as excessive exposure may lead to bone growth problems in children. Nanofiltration/reverse osmosis (NF/RO) is commonly used in groundwater treatment due to the high effectiveness and simple maintenance of these pressure driven membrane processes. In this research, a pilot-scale NF/RO system was used to desalinate a natural groundwater sample containing high Sr concentration (10.3 mg/L) and “old” groundwater organic matter (70.9 mg/L) from Esilalei in northern Tanzania to understand the removal of strontium by NF/RO. The impact of applied pressure (10–15 bar) and groundwater pH (3–12) on the membrane performance including permeate flux, strontium and total organic carbon (TOC) flux and removal was investigated. Increasing applied pressure was found to enhance the flux by increasing the driving force and enhance Sr and TOC removal by dilution effect (water flux higher than Sr passage). The alkaline pH caused severe flux decline likely due to membrane fouling and scaling, while it slightly enhanced Sr removal of RO membranes, but weakened the TOC removal. In contrast, acidic and neutral pH of groundwater enhanced TOC removal. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000126497
Veröffentlicht am 20.11.2020
Originalveröffentlichung
DOI: 10.3390/membranes10110321
Cover der Publikation
Zugehörige Institution(en) am KIT Institute for Advanced Membrane Technology (IAMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2077-0375
KITopen-ID: 1000126497
Erschienen in Membranes
Band 10
Heft 11
Seiten 1-23
Vorab online veröffentlicht am 30.10.2020
Schlagwörter groundwater treatment, natural organic matter, operating pressure, feed water pH, strontium-organic matter interaction, desalination
Nachgewiesen in Scopus
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