Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 541354
Title Understanding and improving the reusability of phosphate adsorbents for wastewater effluent polishing
Author(s) Suresh Kumar, Prashanth; Ejerssa, Wondesen Workneh; Wegener, Carita Clarissa; Korving, Leon; Dugulan, Achim Iulian; Temmink, Hardy; Loosdrecht, Mark C.M. van; Witkamp, Geert-Jan
Source Water Research 145 (2018). - ISSN 0043-1354 - p. 365 - 374.
DOI https://doi.org/10.1016/j.watres.2018.08.040
Department(s) WIMEK
Sub-department of Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Calcium adsorption - Phosphate adsorption - Regeneration - Reusability - Surface precipitation - Wastewater effluent
Abstract

Phosphate is a vital nutrient for life but its discharge from wastewater effluents can lead to eutrophication. Adsorption can be used as effluent polishing step to reduce phosphate to very low concentrations. Adsorbent reusability is an important parameter to make the adsorption process economically feasible. This implies that the adsorbent can be regenerated and used over several cycles without appreciable performance decline. In the current study, we have studied the phosphate adsorption and reusability of commercial iron oxide based adsorbents for wastewater effluent. Effects of adsorbent properties like particle size, surface area, type of iron oxide, and effects of some competing ions were determined. Moreover the effects of regeneration methods, which include an alkaline desorption step and an acid wash step, were studied. It was found that reducing the adsorbent particle size increased the phosphate adsorption of porous adsorbents significantly. Amongst all the other parameters, calcium had the greatest influence on phosphate adsorption and adsorbent reusability. Phosphate adsorption was enhanced by co-adsorption of calcium, but calcium formed surface precipitates such as calcium carbonate. These surface precipitates affected the adsorbent reusability and needed to be removed by implementing an acid wash step. The insights from this study are useful in designing optimal regeneration procedures and improving the lifetime of phosphate adsorbents used for wastewater effluent polishing.

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