Study of a novel micro-cyclonic air flotation device for enhanced oil removal from wastewater

IF 1.6 4区 工程技术 Q3 ENGINEERING, CHEMICAL
Zhong Yan, Xiaoli Zhu, Pengfei Liu, Rui Lv, Xinhe Dai, Guosheng Song, Zhenbo Wang
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Abstract

As global oilfields advance into mid-to-late development stages, the produced fluids contain increasingly high water content, leading to substantial wastewater volumes. Existing oily wastewater treatment systems face challenges in meeting stricter discharge standards. To address this issue, this work proposes a micro-cyclonic air flotation separator that integrates cyclonic and flotation technologies to enhance oil removal efficiency. An experimental setup was designed to systematically investigate the effects of structural and operational parameters on bubble formation and oil removal in a DN100 single-tube micro-cyclonic flotation device. Key operational parameters were selected, and structural parameters were optimized to support the development of a compact, high-efficiency separator for oily wastewater treatment. The experimental results revealed that increasing dissolved air pressure reduces mean bubble size, increases bubble number density, and raises gas holdup. Conversely, as air flow rate increases, the mean bubble size grows, the number density initially rises before decreasing, and gas holdup follows a similar trend. Optimal structural parameters were determined, under which the device demonstrated excellent oil removal performance across an oil concentration range of 200–1000 mg/L, achieving a maximum removal efficiency of 85.69%.

一种新型微旋流气浮装置的研究
随着全球油田进入中后期开发阶段,采出液的含水量越来越高,导致废水量巨大。现有的含油废水处理系统在满足更严格的排放标准方面面临挑战。针对这一问题,本文提出了一种集旋流和浮选技术于一体的微旋流气浮分离器,以提高除油效率。设计了实验装置,系统研究了DN100单管微旋流浮选装置中结构参数和操作参数对气泡形成和除油的影响。选择了关键操作参数,优化了结构参数,以支持紧凑,高效的含油废水处理分离器的开发。实验结果表明,增加溶解空气压力可减小平均气泡尺寸,增加气泡数密度,提高气含率。相反,随着空气流量的增加,平均气泡尺寸增大,数密度先上升后下降,气含率也有类似的趋势。在优化的结构参数下,该装置在200 ~ 1000 mg/L的油浓度范围内具有良好的除油性能,最大去除率为85.69%。
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来源期刊
Canadian Journal of Chemical Engineering
Canadian Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
3.60
自引率
14.30%
发文量
448
审稿时长
3.2 months
期刊介绍: The Canadian Journal of Chemical Engineering (CJChE) publishes original research articles, new theoretical interpretation or experimental findings and critical reviews in the science or industrial practice of chemical and biochemical processes. Preference is given to papers having a clearly indicated scope and applicability in any of the following areas: Fluid mechanics, heat and mass transfer, multiphase flows, separations processes, thermodynamics, process systems engineering, reactors and reaction kinetics, catalysis, interfacial phenomena, electrochemical phenomena, bioengineering, minerals processing and natural products and environmental and energy engineering. Papers that merely describe or present a conventional or routine analysis of existing processes will not be considered.
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