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  • 刘美艳,刘宁,金鑫,金鹏康,王晓昌.臭氧气浮工艺絮体尺度与界面理化特性调控[J].环境工程学报,2019,13(9):2102-2112.DOI:10.12030/j.cjee.201812135    [点击复制]
  • LIU Meiyan,LIU Ning,JIN Xin,JIN Pengkang,WANG Xiaochang.Regulation of the size and interfacial physicochemical properties of flocs in dissolved ozone flotation[J].,2019,13(9):2102-2112.DOI:10.12030/j.cjee.201812135   [点击复制]
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臭氧气浮工艺絮体尺度与界面理化特性调控
刘美艳1, 刘宁2, 金鑫1, 金鹏康1, 王晓昌1
0
(1.西安建筑科技大学环境与市政工程学院,西安 710055;2.中国石油长庆油田油气工艺研究院,西安 710018)
摘要:
针对臭氧气浮工艺对有机物脱色和去除性能的限制,通过阴、阳离子型聚丙烯酰胺(ployacrylamide,PAM)对以腐殖酸为代表的天然有机物絮体的尺度调控,采用气载絮体尺度、二维分形维数及絮体与微气泡间的接触角对PAM浓度梯度下形成的气载絮体进行了表征;研究了阴阳离子型PAM浓度梯度对腐殖酸的降解效果和气载絮体尺度;并探讨了阴阳离子型PAM、絮体与微气泡间的结合机理。结果表明:PAM的投加提高了臭氧气浮工艺中腐殖酸的去除性能,且气载絮体尺寸、分形维数和接触角均有所增大;在不同类型PAM中均存在最佳PAM剂量,在此剂量下,体系内去除效果、气载絮体大小和接触角最大、分形维数最小;在最佳PAM剂量下,与阴离子型PAM相比,阳离子型PAM形成气载絮体的大小和接触角较大,分形维数较小,且去除效果较好。在臭氧气浮体系中,通过改善PAM、絮体与微气泡结合静电作用力的强弱形成了利于气浮的气载絮体尺度,提高了对腐殖酸的去除效果。
关键词:  臭氧气浮工艺(DOF)  腐殖酸  气载絮体  形态特征
DOI:10.12030/j.cjee.201812135
投稿时间:2018-12-13
基金项目:国家重点研发计划项目(2016YFC0400701);国家自然科学基金资助项目(51708443);陕西省教育厅重点实验室科研计划项目(18JS057)
Regulation of the size and interfacial physicochemical properties of flocs in dissolved ozone flotation
LIU Meiyan1, LIU Ning2, JIN Xin1, JIN Pengkang1, WANG Xiaochang1
(1.College of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;2.Oil & Gas Technology Research Institute Changqing Oilfield Company, Xi' an 710018, China)
Abstract:
In response to the performance limitations on the decolorization and removal of organic matter by dissolved ozone flotation process(DOF), anionic and cationic polyacrylamide (PAM) were used to regulate floc size of the natural organic matter represented by humic acid, and aerated flocs formed at different PAM concentration gradients were characterized by aerated floc size, two-dimensional fractal dimension and contact angle between flocs and microbubbles. In addition, the effects of anionic and cationic PAM concentration gradients on humic acid degradation and aerated floc size were studied, and binding mechanism among anionic and cationic PAM, flocs and microbubbles was discussed. The results indicated that PAM addition improved humic acid removal in DOF process, and aerated floc size, fractal dimension and contact angle increased. There was an optimal dosage for different kinds of PAM, at which the removal efficiency, aerated flocs size and contact angle were the largest, and fractal dimension was the smallest. Compared with the anionic PAM at its optimum dosage, the formed aerated flocs using cationic PAM were characterized as larger size, higher contact angle, smaller fractal dimension and better humic acid removal effect. In DOF system, favorable aerated floc size could be formed to improve the removal efficiency of humic acid by ameliorate the electrostatic interaction strength among PAM, flocs and microbubbles.
Key words:  dissolved ozone flotation (DOF)  humic acid  aerated flocs  morphological characteristics