Resource recovery from anaerobically digested liquor of wastewater screenings

Newati Wid and Nigel Horan (2014) Resource recovery from anaerobically digested liquor of wastewater screenings. Borneo Science, 34. pp. 52-59. ISSN 1394-4339

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Phosphorus is a limited resource which is predicted to be exhausted at some point during the 21st century. However, it is present in wastewaters at concentrations that come close to supplying the nation’s annual requirements for fertiliser. Therefore, this study was conducted to study the potential of wastewater screenings which has received little attention that produced during wastewater treatment, for phosphorus recovery. Many papers have addressed the recovery of phosphate or ammonia as struvite from different type of waste. The most prominent usage of struvite (magnesium ammonium phosphate hexahydrate) is as a slow-release fertiliser, suitable as replacement for chemical fertiliser, for agricultural application. In this study, digested liquor was obtained from anaerobically digested of wastewater screening. The experiments were carried out with and without chemical amendment to study the feasibility of phosphorus recovery, at different Mg:P molar ratio, i.e. 1.56:1 (without chemical amendment), 2:1 and 3:1 (with chemical amendments). Precipitation at 1.56:1 showed that phosphorus removal efficiency was 68% and recovered 0.52g amorphous calcium carbonate. Precipitation at 2:1 reduced phosphorus removal efficiency to 53% and the recovered solid was found to be calcium phosphate, with 0.33g precipitate. Precipitation at 3:1 was not economically interesting for P recovery as shown by its lowest removal efficiency and highest chemical usage. The results demonstrated that the presence of calcium and carbonate ion in the digested liquor highly interfere with phosphorus recovery in the form of struvite.

Item Type: Article
Uncontrolled Keywords: Phosphorus recovery , Wastewater screenings , Anaerobically digested liquor , Precipitation technique
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD1-1066 Environmental technology. Sanitary engineering > TD201-500 Water supply for domestic and industrial purposes
Divisions: FACULTY > Faculty of Engineering
Depositing User: DG MASNIAH AHMAD -
Date Deposited: 15 Jun 2022 10:42
Last Modified: 15 Jun 2022 10:42

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