2010 Fiscal Year Final Research Report

Removal and recovery of phosphorus in sewage water by superconducting high gradient magnetic separation with ferromagnetic adsorbent

Research Project

Project/Area Number	20560759
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Recycling engineering
Research Institution	Tokyo Metropolitan University
Principal Investigator	MIURA Osuke Tokyo Metropolitan University, 大学院・理工学研究科, 准教授 (50281241)
Project Period (FY)	2008 – 2010
Keywords	下水処理場 / リン / 富栄養化防止 / ゼロエミッション / 再資源化 / 磁気分離
Research Abstract	Phosphorus in the treated wastewater could be removed absolutely (>90%) by high gradient magnetic separation system (HGMS) with 200 mg/L zirconium ferrite adsorbent for 15 minutes in adsorption time. According to Langmuir plot analysis, we found that this zirconium ferrite adsorbent had the capacity of adsorption of 12.8mg-P/g-ZrFe. We also confirmed that over 70% phosphorus adsorbed by 2000mg/L zirconium ferrite could be desorbed from it by alkali treatment for 15 minutes. After desorbing, zirconium ferrite adsorbent was restored by acid treatment to adsorb phosphorus repeatedly. Magnetic separation speed achieved 1m/sec which was necessary for practical use with an applied magnetic field of 2T and magnetic filter of 8% packing factor. These results suggest that HGMS using powdered zirconium ferrite adsorbent is suitable for a large-scale wastewater treatment at sewage plants, and the possibility of the recovery of phosphorus from the treated sewage water without secondary waste.

(4 results)