Author(s): Yunjung Kim; Younggyun Choi
Linked Author(s):
Keywords: Dsorption; Magnetite; Mill-scale; Particle size optimization; Phosphate; Resource recovery
Abstract: Mill scale‐derived magnetite particles were synthesized and utilized in this study as an adsorbent for phosphate removal. Results obtained in this study showed that alkaline media concentration and alkaline species have a significant effect on the size distribution and phosphate adsorption capacity of synthesized magnetite particles. It was observed that increasing the alkali concentration of both bases results in a decrease in the size and size distribution of the particles. The size range of synthesized magnetite particles was 0.3-1.8mm and 0.4-3.2mm in diameter when NaOH andwas used for co-precipitation, respectively. When the dosage rate of alkaline solution was decreased from over 100 to 10ml/min, much higher size particles (45-300mm in diameter) can be obtained. Sufficient agglomeration of sub-micron size magnetite crystals seemed to be caused by decreased alkali dosage rate and it was responsible for the increase in overall particle size distribution. Moreover, it was found that mill scale‐derived magnetite is an effective adsorbent for the removal of phosphate from wastewater. Magnetite particles synthesized with NaOH solution showed the phosphate adsorption capacity over 10mgP/g.
Year: 2018