加压溶气气浮微气泡产生机理与工程应用研究.pdf
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压溶气气浮微气泡产生机理及工程应用研究
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时玉龙 王三反 武广 陈霞
1.兰州交通大学 环境与市政工程学院 寒旱区水资源综合利用教育部工程研究中心,甘肃 兰州 730070;
2.上海中申环境工程有限公司,上海 201206;3.聊城大学 建筑工程学院,山东 聊城 252059)
[摘要] 目前广泛应用的加压溶气气浮设备的最主要问题是运行能耗过大。通过对加压溶气气浮设备微气泡
产生机理的研究,得出了加压溶气系统在微气泡产生过程中的两个耗能关键点,并提出降 能耗的改进措
施。指出了压力溶气罐内空气溶解过程中气体分散成核步骤中最小能量Δf 的存在及其理论表达式。阐述
了叶轮散气和气浮泵气浮装置在微气泡发生机理方面的转变和节能方面的优势。
[关键词] 加压溶气气浮;微气泡 ;能耗;表面活性剂
Study on Bubble Generation of Dissolved Air Flotation and
Application
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Shi Yu-long , Wang San-fan , Wu Guang ,Chen Xia
1. Engineering Research Center of Water Resources Utilization in Cold and Drought Region,
Ministry of Education, School of Environmental and Municipal Engineering, Lanzhou Jiaotong
University , Lanzhou Gansu 730070, China ;2. Shanghai Jorsun Environmental Engineering Co., Ltd.,
Shanghai 201206, China;3.School of Architecture Civil Engineering, Liaocheng University,
Liaocheng Shandong 250029,China)
Abstract The most important problem of the widely used dissolved air flotation equipment is large
energy consumption. Through the study of the mechanism of the micro-bubbles, key points of the
two energy-consuming processes and measures to reduce energy consumption are pointed out. During
the process of the gas dispersed into the water in the type of micro-bubbles, the minimum energy
Δf must be conquered in the compressor. The theoretical expression Δf is explicated. The
transform of Impeller flotation and flotation pump in the aspect of the mechanism of micro-bubbles
and their advantages of energy saving are described.
Keywords dissolved air flotation ; micro-bubble; energy consumption; surfactant
1 气浮工艺
气浮工艺是利用系统产生的微气泡与目标去除物及其聚合体结合,形成夹气絮体。夹气
絮体在浮力的作用下上浮到液相表面形成稳定的浮渣层,并最终伴随浮渣层的去除从液相主
体中分离。
气浮工艺对液相中难以自然沉降的悬浮物有很好的分离效果,在许多行业的水处理中得
到了广泛应用。从最先的石油化工行业中含油废水的油水分离和采矿酸洗废水、 金电镀废
水中金属离子的收集分离,发展到后来造纸行业木质纤维
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