Citation:

Nadagouda, M., C. Han, G. Varshney, AND N. Kesav. Resource Recovery and Reuse: Recycled Magnetically Separable Iron-based Catalysts for Phosphate Recovery and Arsenic Removal. To be Presented at ACS Meeting, San Diego, CA, March 13 - 17, 2016.

Impact/Purpose:

Nutrient Recovery

Description:

Environmentally friendly processes that aid human and environmental health include recovering, recycling, and reusing limited natural resources and waste materials. In this study, we re-used Iron-rich solid waste materials from water treatment plants to synthesize magnetic iron-oxide adsorbents for the removal of phosphates and arsenic from wastewater. The iron rich solid waste residuals were treated with PVA in different ratios and were subjected to a combustion process to induce magnetization; then converted to powder and pellet forms. The physicochemical properties of the synthesized adsorbents were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution-TEM (HR-TEM), and a porosimetry analyzer. The adsorption properties of the synthesized adsorbents for the removal of arsenic and phosphate was evaluated in both batch and equilibrium experiments under different experimental conditions. Under neutral pH (pH=7), the 1:3 ratio adsorbent demonstrated the highest phosphate adsorption (> 10 mg/L of phosphate in one hour). For the sample synthesized with a 1:1 ratio, the highest phosphate removal was observed at alkaline pH (pH=9) in 1.5 hr. The study shows that we can successfully recycle residual solid wastes and synthesize valuable magnetic nanoparticles that can be used for phosphate removal and arsenic from water

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