Record nummer 2250397
Titel Struvite: technology, fertilizer legislation and cleaning of scaling by caustic Soda
Auteur(s) Bakker, D.
Uitgever [S.l.] : [s.n.]
Jaar van uitgave 2019
Pagina's 69 p
Online full text
Trefwoorden (cab) afvalwater / fosfaat / reststromen / magnesiumammoniumfosfaat
Rubrieken Afvalwaterbehandeling
Publicatie type Studentenverslag
Taal Engels
Toelichting (Engels) The limited natural phosphorus reserves in the world are gradually depleting. This makes it interesting to look for other ways of recovering phosphorus. One of the possibility’s is the recovery of phosphate (PO4) from industrial and municipal waste water, by the precipitation of struvite. By dosing magnesium to waste water, Ammonium (NH4+), Phosphate (PO43-) and Magnesium (Mg2+) might form a crystal together called struvite (MgNH4PO4(s)). Struvite has a low solubility, which makes it interesting to use as a slow-release fertilizer. With struvite, crops would be longer enriched with nutrients, which means less fertilizer is needed in the long run. This thesis will investigate on what level struvite- and other P-recovering technologies, can possibly contribute to the demand for phosphorus in the EU. Struvite in a fairly new product, which means that European legislation still has to catch up to the fact that struvite from waste water can be effectively used as a fertilizer. This thesis aims to clarify the current and upcoming European legislation concerning the use of struvite (from waste water) as a fertilizer. Struvite can also form and precipitate naturally (uncontrolled). In waste water treatment plants (WWTP), this can cause pipe clogging. Conventional methods for dealing with this problem are mostly expensive, environmentally unfriendly or simply inefficient. In theory it seems possible to dissolve struvite by adding caustic soda (NaOH), which would be a better alternative as it does not create as much problems as conventional cleaning methods. This thesis will investigate if and how caustic soda can effectively remove struvite scaling inside industrial piping.
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