絮体回流成核絮凝作用机理及微核操控技术研究

Floc recycling- Nucleation flocculation is a kind of flocculation method that the micronucleus generated by primary flocs reengage the process of flocculation through control the operation of flocs recycle. Compared with conditional flocculation, this approach has more stable operation, lower cost and higher performance of decontamination. It has been applied to several practical projects. However, limited to the detection means, the theoretical research is not conducted for now. This study intends to adopt floc image acquisition and analysis system and potential analyzer to research nucleation and self-reorganization mode for confriming the clear cause of primary floc, to study the micronucleus restructuring bridging mechanism under the conduction of colloiadl and modified colloidal being acted by micronucleus alone or with coagulant aid, to discuss the morphology of floc and its sedimentation performance, to explore, in the condition of multiple recycling, the micronuclei nucleation and self-reorganization mode and micronucleus restructuring bridging mechanism for the establishment of micronuclei nucleation mode migration spectrum and floc recycling-nucleation flocculation starts spectrum，to research the effect of technology of micronucleus control on morphology and chemical composition for further strengthening of flocculation.Thus, it can provides theoretical basis and technical supports for practical engineering applications.

絮体回流成核絮凝是一种通过控制絮体回流的操作，使絮体形成微核后重新参与反应进程的一种高效絮凝技术。该技术具有运行稳定、成本低、除污效能远优于传统絮凝工艺的优点，已成功应用于一些工程实践，因检测与表征手段的局限性，一直未能从理论层面明确该絮凝方法的反应机理，从而限制了其应用和推广。本研究将采用絮体图像实时采集分析系统，Zeta电位测定等技术手段，研究初级絮体微核的成核及自重组模式，揭示初级絮体的形成致因；研究微核单独作用和混凝剂辅助作用于胶体或改性胶体的微核重组桥接机制，探讨絮凝体形态及沉降性能；研究多次回流情况下絮体微核的成核及自重组模式和微核重组桥接机制，建立微核成核模式迁移图谱和絮体回流成核絮凝启动图谱；研究操控手段对微核形态和成分的影响，实现对絮体回流成核絮凝的强化，为实际工程应用提供理论依据和技术支持。

絮体回流成核絮凝作为一种高效絮凝方法已成功应用于一些工程实践，但一直以来未能从理论层面明确该絮凝方法的反应机理。本研究通过对微核性质的分类界定、不同致因絮体强制破碎成核自重组的特性的分析、不同致因絮体回流成核对二级絮体（一次絮体回流后所形成的SEF絮体）形成的影响解析，研究了混凝剂投加量对絮体回流成核絮凝强化传统絮凝出水效能的影响，探明了有/无辅助混凝剂条件下絮体回流成核絮凝絮体形成过程以及絮体形态特征的变化过程，建立了微核成核和微核自重组的基本模式，从而揭示了微核作用于胶体重组桥接作用过程及所形成的絮凝体的特性；进一步探究了微核反复多次成核迁移过程和微核成核絮凝启动过程，解析了微核作用的持续性特征，形成了SEF启动图谱，提出了絮体表面活性衰减理论、不溶凝胶剥离理论和有/无辅助混凝剂存在时的絮体回流成核絮凝机制；并且，通过系统研究絮体回流成核絮凝中微核的操控对胶体或改性胶体的聚集机制的影响，初步掌握了有效技术酸活化技术和包裹次序控制技术。