磁性载体强化混凝和磁力旋流澄清池组合工艺的中试试验研究

Pilot Study on the Combination Process of Magnetic Carrier Enhanced Coagulation and Magnetic Cyclone Clarifier

以磁铁矿粉为原料,采用球磨混合和表面酸反应“一步法”生产工艺制备得到磁性载体,经表征分析,磁性载体保持了良好的磁响应性,表层生成羟基硫酸铁活性组分,相比磁铁矿粉,磁性载体BET表面积增加到了2.8倍、Langmuir表面积增加到了6.9倍,在混凝过程中能够强化对水中污染物的混凝吸附作用。通过40 t/d处理规模磁力旋流澄清中试试验系统,比较了混凝沉淀、磁混凝沉淀和磁性载体强化混凝三个过程,用磁性载体替代PAC和磁铁矿粉混合投加的磁混凝过程后,出水COD平均为34.7 mg/L,出水总磷平均为0.30 mg/L,与磁混凝过程对COD和总磷的去除率接近,表明磁性载体强化混凝能够实现磁混凝的出水目标,其污泥产量更少、运行管理更方便。

Using magnetite powder,a magnetic carrier was prepared using a"one-step"production process of ball milling and surface acid reaction.Characterization analysis showed that the magnetic carrier maintained good magnetic response,and the surface layer generated active components of hydroxyl ferric sulfate.Compared to magnetite powder,the BET surface area of the magnetic carrier increased by 2.8 times and the Langmuir surface area increased by 6.9 times,which could enhance the coagulation and adsorption of pollutants in water.Through a pilot test system of a magnetic cyclone clarifier with a treatment capacity of 40 t/d,three processes of coagulation precipitation,magnetic coagulation precipitation,and magnetic carrier enhanced coagulation were compared.After replacing PAC and magnetite powder with magnetic carrier in the magnetic coagulation process,the average COD of the effluent was 34.7 mg/L and the total phosphorus of the effluent was 0.30 mg/L,which was close to the removal rate of COD and total phosphorus in the magnetic coagulation process.This indicated that magnetic carrier enhanced coagulation could achieve the effluent target of magnetic coagulation,with less sludge production and easier operation and management.