一种磁性剩余污泥的制备及其除磷研究

发布时间：2018-03-25 23:32

本文选题：磁性剩余污泥　切入点：磁分离　出处：《北京大学学报(自然科学版)》2017年06期

【摘要】：以FeCl_3,FeCl_2和NH_3·H_2O为原料,通过共沉淀法制备磁性Fe_3O_4纳米颗粒(MNPs),并将含水率为99%的剩余污泥与其复合,制备磁性剩余污泥(MES)。采用交变梯度磁强计测定、扫描电子显微镜观察等分析方法对MES进行表征。计算磁分离后的污泥体积浓缩程度,进行MES对磷的吸附去除研究。结果表明,MES具有超顺磁性,其饱和磁化强度为42 emu/g,30秒内可实现固液分离,且分离后的MES体积为原剩余污泥体积的1/10。MES吸附磷的最适p H为4~6,最佳磷溶液初始浓度为16 mg/L(以P计),600分钟后达到吸附平衡。准二级动力学模型对吸附试验数据的拟合程度较高。MES对磷的吸附等温线符合Langmuir方程,理论最大吸附量为3.00 mg/g(以P计)。磁性剩余污泥可快速、大幅度地缩减剩余污泥体积,且对磷的吸附性能优于剩余污泥。研究结果可为处理剩余污泥提供新的途径。
[Abstract]:Using FeCl _ 3H _ 2O and NH_3 _ H _ 2O as raw materials, magnetic Fe_3O_4 nanoparticles were prepared by co-precipitation method. The excess sludge containing 99% water content was mixed with it to prepare magnetic excess sludge. The magnetic excess sludge was measured by alternating gradient magnetometer. The MES was characterized by scanning electron microscopy (SEM), the sludge volume concentration after magnetic separation was calculated, and the adsorption and removal of phosphorus by MES were studied. The results showed that MES had superparamagnetic properties. The saturation magnetization is 42 emu / g, and the solid-liquid separation can be realized in 30 seconds. The optimum pH for phosphorus adsorption by 1/10.MES with MES volume being original excess sludge volume is 4g / L, and the optimal initial concentration of phosphorus solution is 16mg / L (calculated at P for 600min). The adsorption equilibrium is obtained by quasi-second-order kinetic model. The adsorption isotherm of phosphorus by mes accords with Langmuir equation. The theoretical maximum adsorption capacity is 3.00 mg / g (calculated as P). Magnetic excess sludge can rapidly reduce the volume of excess sludge, and the adsorption performance of phosphorus is better than that of surplus sludge. The results provide a new approach for the treatment of excess sludge.
【作者单位】：深圳市重金属污染控制与资源化重点实验室北京大学深圳研究生院环境与能源学院;
【基金】：深圳市科技计划技术开发项目(JSKF20150828173756275) 流域生态工程学学科建设(深发改[2017]542号)资助
【分类号】：X703

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