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Aminophosphonates in Nanofiltration and Reverse Osmosis Permeates

  • Aminophosphonates such as aminotris(methylenephosphonic acid) (ATMP) are common constituents of antiscalants. In nanofiltration (NF) and reverse osmosis (RO) processes, ATMP prevents inorganic scaling leading to more stable membrane performance. So far, little attention has been paid to the possible permeation of aminophosphonates through NF and RO membranes. We have investigated the permeability of these membrane types for ATMP and its potential metabolites iminodi(methylenephosphonic acid) (IDMP) and amino(methylenephosphonic acid) (AMPA) with two different NF membranes (TS40 and TS80) and one RO membrane (ACM2) and three different water compositions (ultra-pure water, synthetic tap water and local tap water). We found traces of phosphonates in all investigated permeates. The highest phosphonate rejection occurred with local tap water for all three membranes investigated. Filtration experiments with a technical antiscalant formulation containing ATMP indicated similar trends of phosphonate permeability through all three membranes.Aminophosphonates such as aminotris(methylenephosphonic acid) (ATMP) are common constituents of antiscalants. In nanofiltration (NF) and reverse osmosis (RO) processes, ATMP prevents inorganic scaling leading to more stable membrane performance. So far, little attention has been paid to the possible permeation of aminophosphonates through NF and RO membranes. We have investigated the permeability of these membrane types for ATMP and its potential metabolites iminodi(methylenephosphonic acid) (IDMP) and amino(methylenephosphonic acid) (AMPA) with two different NF membranes (TS40 and TS80) and one RO membrane (ACM2) and three different water compositions (ultra-pure water, synthetic tap water and local tap water). We found traces of phosphonates in all investigated permeates. The highest phosphonate rejection occurred with local tap water for all three membranes investigated. Filtration experiments with a technical antiscalant formulation containing ATMP indicated similar trends of phosphonate permeability through all three membranes. We assume that the separation mechanisms of the membranes are the results of a very complex relationship between physico-chemical properties such as Donnan exclusion, feed pH, feed ionic strength and feed concentration, as well as solute–solute interactions.show moreshow less

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Metadaten
Author: Ramona KuhnORCiD, Carsten Vornholt, Volker Preuß, Isaac Mbir Bryant, Marion MartienssenORCiD
DOI:https://doi.org/10.3390/membranes11060446
ISSN:2077-0375
Title of the source (English):Membranes
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2021
Tag:AMPA; ATMP; antiscalant; drinking water treatment; nanofiltration; phosphonates; reverse osmosis
Volume/Year:11
Issue number:6
First Page:1
Last Page:16
Article number:446
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Biotechnologie der Wasseraufbereitung
Fakultät 2 Umwelt und Naturwissenschaften / FG Wassertechnik
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