Removal of phosphate from municipal sewage by high gradient magnetic separation①
来源期刊：中南大学学报(英文版)2004年第4期
论文作者：黄自力 胡岳华 徐竞 郑春华
文章页码：391 - 394
Key words：removal; phosphate; municipal sewage; high gradient magnetic separation
Abstract: The removal of phosphate from municipal sewage by high gradient magnetic separation using aluminium sulphate as precipitating agent and Fe3O4 as seeding material was studied. The effects of aluminium sulphate, Fe3O4 ,magnetic field intensity, pH value and flow-rate of sewage on phosphorus removal rate were investigated. The results show that addition of 200 mg/L Al2(SO4)3·18H2O and 300 mg/L Fe3O4, magnetic field intensity of 200 kA/m, pH value of 4.5 7.0 and flow-rate of 6.15 cm/s are both efficient and economic technical parameters for removal of phosphate. The pH value has a tremendous effect on the removal of phosphate. In the pH range of 4.5 7.0, more than 95% phosphate can be removed. Theoretical analysis indicates that the solubility of AlPO4 is minimum at pH 4.0 7.0 and the electrostatic attractive force between AlPO4 and Fe3O4 is maximum at pH 4.5 6.5.
