The effects of PO43- removal from aqueous solution with varied concentrations of metal oxides in steel slag filter system

Hamdan, Rafidah and Mohd Arshad, Nur Ain Nazirah and Ahmad, Siti Zu Nurain (2018) The effects of PO43- removal from aqueous solution with varied concentrations of metal oxides in steel slag filter system. Journal of Physical Science, 29 (3). 71–80. ISSN 1675-3402

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Abstract

High amount of orthophosphate will accelerate the growth of autotrophs and eutrophication will occur. This phenomenon decreases the water quality and as a result may increase the cost of water treatment for drinking water. The overabundance of orthophosphate occurs when untreated or inadequately-treated wastewater from domestic and industrial activities is released into water bodies. Conventional treatment has been developed to treat wastewater. However, it is not effective for phosphorus removal, hence, high-cost advanced treatment is needed to remove phosphorus. Thus, alternative low-cost treatments for phosphorus removal are needed. Therefore, this study was conducted to understand and investigate the mechanisms of phosphorus removal using two different setups of steel slag filter, Set 1 for high Fe and Set 2 for high Ca. The study was operated at different pH values of 3, 5, 7, 9 and 11 under aerated and unaerated conditions. The samples of steel slag from 12 filters that has been run for three months for each set were semi-quantitatively analysed using scanning electron microscope-energy dispersive X-ray (SEM-EDX) to identify the adsorption of phosphate ion on the surface of the steel slag. The results of SEM-EDX studies showed that adsorption mechanism of phosphate removal takes place on the surface of the steel slag. The precipitates in the steel slag filters were collected and analysed for X-ray diffraction (XRD) for chemical compound identification and the precipitates were confirmed to be Fe3O4, a precursor of iron phosphate related compound.

Item Type:	Article
Uncontrolled Keywords:	Eutrophication; phosphate removal mechanism; steel slag filter; metal oxides; aqueous solution
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD201-500 Water supply for domestic and industrial purposes > TD429.5-480.7 Water purification. Water treatment and conditioning. Saline water conversion
Divisions:	Faculty of Civil Engineering and Built Environment > Department of Civil Engineering : Water and Environmental Engineering
Depositing User:	UiTM Student Praktikal
Date Deposited:	22 Nov 2021 07:28
Last Modified:	22 Nov 2021 07:28
URI:	http://eprints.uthm.edu.my/id/eprint/3944

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