Natural treatment based on willows for concentrate of reverse osmosis

Van Houtte, E.; Mendonca, I.; McAteer, E.; Rogier, T.; Van Eeghem, J.; de Grave, V.W.; Verbauwhede, J.; Notebaert, B.

doi:/10.5004/dwt.2023.30091

Natural treatment based on willows for concentrate of reverse osmosis

Van Houtte, E.; Mendonca, I.; McAteer, E.; Rogier, T.; Van Eeghem, J.; de Grave, V.W.; Verbauwhede, J.; Notebaert, B. (2023). Natural treatment based on willows for concentrate of reverse osmosis. Desalination and Water Treatment 309: 180-184. https://dx.doi.org/10.5004/dwt.2023.30091

In: Desalination and Water Treatment. Taylor & Francis: London. ISSN 1944-3994; e-ISSN 1944-3986, meer

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VLIZ: Open access 398916 [ download pdf ]

Trefwoord

Marien/Kust

Author keywords

Water reuse; Membranes; Concentrate disposal; Natural treatment; Managed aquifer recharge; Climate change

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Van Houtte, E., meer Mendonca, I. McAteer, E. Rogier, T., meer	Van Eeghem, J. de Grave, V.W., meer Verbauwhede, J., meer Notebaert, B., meer

Abstract

Aquaduin started reusing wastewater effluent for infiltration, Cf. managed aquifer recharge (MAR), in its dune water catchment St-Andre in 2002. The treatment train at the Water Production Centre Torreele is based on multiple barrier approach with submerged ultrafiltration prior to reverse osmo-sis (RO). The project not only resulted in enhanced ecological values of the dunes but during the recent longer periods of drought, the combination of reuse/MAR proved to be a robust and safe way to ensure drinking-water production and thus is a potential solution to mitigate the impact of climate change [1]. Concentrate disposal is an issue when using RO. However, as Aquaduin oper-ates in a coastal area, disposal could be managed; the concentrate was discharged in a canal that drained to the sea. To mitigate the impact of this discharge, treatment of RO concentrate using wil-lows has been tested since 2007. This research resulted in the full-scale implementation of a wil-low field or marsh, that is based on the concept of a horizontally constructed wetland combined with short rotation coppice using willows (Salix). The construction started in 2021 and early 2022 the willow marsh became operational. In 2022 a total volume of 538.446 m3 was treated by the willow marsh, 85% of the total volume of RO concentrate produced. This paper will present the preliminary research, construction and initial results of the treatment.

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