Abstract: Magnetic seeding flocculation(hereinafter referred to as MSF) has been studied and applied to various types of waste water treatment, but very few studies have been reported regarding magnetic seed mechanism. In order to solve this problem, MSF method was conducted in this study to simulate micro-etching copper waste water. This study compared the influences of dosing magnetic seed on removal rates of copper and turbidity, floc sedimentation rate or floc size, and analyzed the mechanism of magnetic seed effectiveness. The results showed that MSF reached its best performance at 2.0g/L and particle sizes between 300 and 400mesh. Under optimal conditions, the highest removal rates for copper and turbidity were 98.53% and 94.72%, 4.11% and 0.61% higher than traditional flocculation respectively; settling speed also reached its maximum of 5cm/min, 2.64times greater than traditional flocculation;and floc size D₅₀ also reached its maximum of 41.94μm, 20micrometers larger than traditional particle size. The above figures indicated that the floc growth rate was affected by magnetic seed dosage and particle size. This study provided theoretical and practical parameters for the application of MSF.

Key words: magnetic seeding flocculation, copper waste water, particle size distribution, sedimentation, separation

摘要： 目前磁加载絮凝技术已被研究用于处理多种类型的废水,然而关于此技术中磁粉作用机理方向少有报道。为了解决这一问题,本文采用磁加载絮凝法处理模拟微蚀铜废水,研究了磁粉的加入对Cu²⁺和浊度去除率、絮体沉降速率以及絮体粒径的影响,深入分析了磁粉的作用规律和机理,为磁加载絮凝法应用到实际工程中提供了理论依据和技术参数。结果表明,当磁粉投加量和粒径分别取2.0g/L和300～400目时,磁加载絮凝效果最好。此时,Cu²⁺和浊度去除率均达到最高值98.53%和94.72%,比传统絮凝法高出4.11%和0.61%;絮体沉降速率最快,达5cm/min,是传统絮凝沉降速率的3.64倍;絮体粒径D₅₀也达到最大值41.94μm,较传统絮体粒径大20μm。磁粉投加量过多或过少、粒径过大或过小都会相应地减慢磁絮体的生长速率。

关键词: 磁加载絮凝, 含铜废水, 粒度分布, 沉降, 分离