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ECF_(LFAP)-DBD_(HFP-OW)联用技术修复富营养化水体的实验研究
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摘要
随着水资源短缺和水质的不断恶化,采用何种高效、清洁、少二次污染、便于操作和管理的方法来消除藻类污染,保障用水安全,是水体富营养化治理工作的重点与难点。为克服现有除藻工艺存在的缺陷和不足,本论文提出低频交变脉冲电絮凝气浮—介质阻挡放电水上等离子联用技术处理富营养化水体。利用电絮凝气浮法,先行去除水体中大部分的藻类及天然有机物,以提高后续等离子去除效率、缩短反应时间;同时利用介质阻挡放电水上等离子装置,强化电絮凝气浮的除藻抑藻效果,进一步提高天然有机物的去除率。
     本论文以培养的微囊铜绿藻为研究对象,考察了不同电气参数下介质阻挡放电水上等离子实验装置的灭藻抑藻效果;后以实际重度富营养化水体为研究对象,从去除效果、节能和防电极钝化等角度考察了低频交变脉冲电絮凝气浮法的处理效果;在上述研究的基础上,提出低频交变脉冲电絮凝气浮—介质阻挡放电水上等离子联用技术,考察了该联用工艺的处理效果。
     实验结果表明,低频交变脉冲电絮凝气浮—介质阻挡放电水上等离子联用技术能够有效的修复富营养化水体。在低频交变脉冲电絮凝气浮段,脉冲电压25 V、脉冲频率0.1 kHz、占空比70%条件下,电解20 min即可达到叶绿素a去除率92.36%、UV254去除率40.80%的效果。通过电絮凝气浮处理后,在脉冲频率20.3 kHz、输入电流0.17 A条件下,分离后水样经介质阻挡放电水上等离子装置电解30 mmin即可达到藻类近100%去除的效果,电解60 min则能够达到最佳有机物去除效果。
With the shortage of water resources and deterioration of water quality, using a efficient, clean, less secondary pollution, convenient operation and management algae removal methods is a key point and also a difficult point in the remediation of eutrophic water. In order to overcome the defects and shortcomings of exisiting algae removal technologies, this paper put forward to integrated low frequency alternating pulse electro-coagulation-flotation-high frequency pulse dielectric barrier discharge over water process (integrated ECFLFAP-DBDHFP-OW process). ECFLFAP process is used to remove most of the algae and organic matters in water, in order to improve the efficiency of subsequent process removal sfficiency and shorten reaction time. At the same time, DBDHFP-OW process can enhance the removal rates of algae and organic matters comparison of using ECFLFAP process.
     This paper discussed the inactivation of Microcystis aeruginos by DBDHFP-OW process with different electrical parameters. And then, severe eutrophic water was taken as research object and ECFLFAP process was adopted to study of the treatment effect from the perspective of removal efficiency, energy conservation, and elimination of passivation to electrodes. Based on the prophase research, we put forward to the integrated ECFLFAP-DBDHFP-OW process, and then, investigated the treatment effect by this combined process.
     The results show that:Integrated ECFLFAP -DBDHFP-OW process is proved effective to remedy eutrophic water. Under the optimal conditions of aluminum electrolysis, pulse voltage 25 V, pulse frequency 0.1 kHz, duty cycle 70%, electrolysis time 20 min, ECFLFAP process can reduce the Chl-a by 92.36% and UV254 by 40.80%. After ECFLFAP process, under the optimal conditions of pulse frequency 20.3 kHz and input current 0.17 A, nearly 100% removal efficiency of Chl-a was achieved with treatment for 30 min, and organic compounds removal efficiency was increased from 40.80% to 53.23% in DBDHFP-ow process with treatment for 60 min.
引文
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