逆向-同向流气浮工艺构建与运行特性

发布时间：2018-02-03 08:50

  本文关键词： 混凝 浮选 CCDAF 吸附 泡絮碰撞黏附 溶气气浮　出处：《化工学报》2016年12期 　论文类型：期刊论文

【摘要】：针对传统溶气气浮(DAF)工艺中气泡对絮体颗粒捕集、黏附效率低,泡絮体黏附不稳定等问题,基于泡絮碰撞黏附理论,研发了集逆向流与同向流于一体的DAF工艺(CCDAF)。该工艺溶气水分两次投加,接触室分为碰撞接触室和黏附接触室。试验结果表明,CCDAF工艺显著提高了泡絮黏附效率和泡絮体稳定性,对浊度、藻类平均去除率达到96.4%、96.50%,出水颗粒物以2~7μm粒径为主。工艺主要去除大分子、疏水性有机物,CODMn、UV254、DOC平均去除率分别达到37.6%、46.3%和32.11%,CCDAF比同向流及逆向流DAF除污染效能更加显著。泡絮黏附机理分析表明,CCDAF工艺逆向流碰撞区主导作用机制为碰撞黏附及共聚作用,同向流接触区为碰撞黏附及网捕、包卷和架桥作用。
[Abstract]:In view of the traditional dissolved air flotation (DAF) process of bubble floc particle trapping, the adhesion efficiency is low, the bubble floc attachment instability problems, based on the theory of bubble floc collision developed in adhesion, reverse flow with the same to the DAF technology integrates (CCDAF). The process of water soluble gas in two dosage the room is divided into contact, contact chamber and adhesion contact chamber. The test results show that CCDAF technology improved the efficiency and stability of foam foam floc adhesion, flocs of turbidity, algae 96.50% average removal rate reached 96.4%, and the effluent particles with 2~7 m diameter. The main process of removal of hydrophobic organic molecules. CODMn, UV254, DOC, the average removal rate reached 37.6%, 46.3% and 32.11%, CCDAF than the same flow and reverse flow DAF pollution removal efficiency is more significant. Analysis of foam floc adhesion mechanism showed that the CCDAF technology of reverse flow collision area leading mechanism for the collision of adhesion and copolymerization, the same direction The flow contact area is the effect of collision and adhesion and net capture, wrapping and bridging.

【作者单位】： 山东建筑大学市政与环境工程学院;山东省绿色建筑协同创新中心;山东省城市供排水水质监测中心;北京工业大学建筑工程学院北京市水质科学与水环境恢复工程重点实验室;
【基金】：山东省科技发展计划项目(2014GSF120003) 住房和城乡建设部科学技术项目计划项目(2014-K5-026) 山东省自然科学基金项目(ZR2016EEM32) 山东建筑大学博士基金项目(XNBS1511)~~
【分类号】：TU991.2
【正文快照】： 水环境恢复工程重点实验室,北京100124)引言在给水处理领域,溶气气浮工艺(dissolved airflotation,DAF)已广泛应用于高藻、微污染水及低温低浊水的处理[1-3]。气浮接触区是微气泡与絮体颗粒混合、碰撞、黏附的主要场所,其运行效果好坏直接影响着气浮净水效果的优劣[4-6]。传统，

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