2013 Fiscal Year Final Research Report

Development of new water purification system by magnetic separation with magnetic activated carbon

Research Project

Project/Area Number	23560650
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Civil and environmental engineering
Research Institution	Tokyo Metropolitan University
Principal Investigator	MIURA Osuke 首都大学東京, 理工学研究科, 准教授 (50281241)
Project Period (FY)	2011 – 2013
Keywords	磁気分離 / 磁性活性炭 / 磁性ゼオライト
Research Abstract	We have studied the possibility of advanced water purification by using a high gradient superconducting magnetic separation HGSMS with magnetic adsorbents. We have developed magnetic mesoporous activated carbon MMPC for humic acid and other organic matters, oxidized magnetic activated carbon OxMAC for ammonia nitrogen, and magnetic zeolite MZL for ammonia nitrogen. By means of expanding micro-pores by heat treatment, the humic acid was able to be efficiently absorbed by MMPC. About 80 % of ammonia nitrogen can be adsorbed from 0.8 mg/L of ammonium chloride solution by Ox-MAC due to the acid functionalities fixed on the surface. Since the adsorbed humic acid and ammonia nitrogen were easily released by heating in atmosphere at low temperatures. MZL also effectively absorbed ammonia nitrogen by Na ion exchange. By using HGSMS, MMPC with a large magnetization can be collected from the solution by 99.95 % at a high speed flow velocity of 1 m/s and low magnetic fields under 2 T.