• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    Procedure and system of elimination of micropollutants by reactor with magnetic nanoparticles and external separation unit. The present invention relates to a system and method for removing micropollutants comprising the use of magnetic nanoparticles and an external separation unit. The nanoparticles react with the microcontaminating agents and are subsequently retained by the external separation unit. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2670712A1
    申请号:ES201830150
    申请日:2018-02-19
    公开日:2018-05-31
    发明作者:María GAMALLO MIRÓN；Yolanda MOLDES DIZ；Gemma María EIBES GONZÁLEZ；Carlos VÁZQUEZ VÁZQUEZ；Alfonso Fondado Fondado；Jorge MIRA PÉREZ；Juan Manuel Lema Rodicio；Gumersindo Feijoo Costa；María Teresa MOREIRA VILAR
    申请人:Universidade de Santiago de Compostela；
    IPC主号:
    专利说明:

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    In the system object of the present invention the magnetic nanoparticles comprise magnetic iron oxide: magnetite or maghemite. Magnetic nanoparticles have a preferred diameter in the range 10-100 nm and have superparamagnetic properties. In a more particular embodiment the nanoparticles have a preferred size of 10 nm. Superparamagnetic nanoparticles were characterized by TEM analysis and size distribution histograms, see Figure 2. The concentration of magnetic nanoparticles inside the reactor of the microcontaminant removal system is in the range of 50-1000 mg L-1.
    The system object of the present invention is characterized in that the second pumping system extracts the treated current from the interior of the reactor to the medium once the treatment is finished if the value provided by the microcontaminant measurement system at the reactor outlet is less than a set maximum value, or recirculate the output current back to the reactor if the value provided by the microcontaminant measurement system at the reactor output is greater than a set maximum value.
    Once the reaction time necessary to carry out the elimination of the target microcontaminants has elapsed, the second pumping system is activated to extract the clean stream of contaminants out of the reactor.
    The reactor flow rate is maintained at values in the range 70-150 mL min-1, so that the magnetic nanoparticles are retained in the walls of the pipes through which the effluent circulates. In a preferred embodiment the pipes are made of Teflon, with an internal and external diameter of 2 and 5 mm, respectively. This conduction is bent so that several steps of the same conduit within the magnetic separation system coincide (Figure 3). In a particular embodiment the number of steps is 4.
    Once the reactor has been emptied, a reaction cycle is completed and a new one can be started. To start a new cycle, contaminated effluent is pumped again through the pipeline where the nanoparticles are retained, with an inlet flow in the range 600-750 mL min-1, so that the nanoparticles are completely entrained into the reactor again, by dragging with the input influent, to begin a new reaction stage. This process can be repeated successively in different reaction cycles.
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    The microcontaminant measurement system samples the reactor inlet and outlet currents to determine the concentration of the contaminants and verify the removal efficiency after oxidative treatment.
    In another aspect, the invention relates to the use of the method and system described above for the elimination of microcontaminants present in secondary effluents from wastewater treatment plants (WWTP) or industrial effluents. BRIEF DESCRIPTION OF THE FIGURES
    The modalities detailed in the figures are illustrated by way of example and not by way of limitation:
    Figure 1. Schematic diagram of the reaction system with external magnetic separation and its application in the treatment of microcontaminants. The influent enters the reactor, with a certain concentration of pollutants, where the magnetic nanoparticles are in solution (Stage I). It is allowed to react for the necessary reaction time in each case (Stage II). After the reaction stage, the reactor output current is pumped by passing through the magnetic separation system, obtaining the treated effluent and free of nanoparticles, which can be discharged into the aquatic environment (Stage III). Finally, contaminated new influent is pumped by dragging the retained nanoparticles into the system and a new reaction cycle begins.
    Figure 2. Schematic diagram of the profile of the magnetic separation system. Figure 3. Characterization results of iron nanoparticles by size distribution histograms.
    Figure 4. TEM analysis of iron nanoparticles.
    Figure 5. Simulation of the magnetic fields (T) produced by different magnet configurations: alternating polarity (a) and in series (b) (COMSOL Multiphysics ®).
    Figure 6. Concentration profiles (percentage with respect to the concentration in the inlet stream) of RB19 in the bleaching experiments () and in the control () in the outlet stream of the reactor for dye treatment (25 mg L-1) in 13 cycles with an operating time of 7 h.
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    of magnetic iron as catalysts, with an average concentration of 200 mg L-1. Control experiments were performed for each cycle, without the presence of a catalyst or hydrogen peroxide, under the same conditions as the bleaching experiments. The operating conditions in the reactor were: temperature: 25 ° C; real wastewater at pH 3; stirring: 150 rpm; volume: 20 mL; 10 cycles of 7 h each; Inlet and outlet flows to the reactor of 70 and 600 mL min-1, respectively.
    The discoloration of the RB19 dye was determined by spectrophotometry at a wavelength of 592 nm, relating by means of an absorbance-concentration calibration line. The discoloration results are shown in Figure 6, where it is observed that the system is capable of removing the color even under real conditions of colored effluents with a percentage around 60% over 10 cycles of dye discoloration. Example 3
    The application of the procedure described above for the decolorization of Rhodamine B (RB) dye was carried out, for the treatment of colored waters using iron nanoparticles by the Fenton oxidation process in an SBR reactor with a useful volume of 20 mL coupled to an external magnetic separation system, as seen in Figure 1, in order to retain the iron nanoparticles and reuse them in consecutive cycles of discoloration. The average concentration of the catalyst used was 200 mg L-1 and the concentration of the RB dye in the influent was 10 mg L-1. Control experiments were performed for each cycle, without the presence of a catalyst or hydrogen peroxide, under the same conditions as the bleaching experiments. The operating conditions are detailed below; temperature: 25 ° C; pH 3; stirring: 150 rpm; 10 cycles of 24 h each; Inlet and outlet flows to the reactor of 70 and 600 mL min-1, respectively.
    The elimination of RB was determined by spectrophotometry at a wavelength (λ) characteristic of the 550 nm dye, relating by means of a absorbance-concentration calibration line. The results obtained show that the system eliminates the color around 50% over the 10 cycles (Figure 7).
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    权利要求:
    Claims (1)
    [1]
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    同族专利:
    公开号 | 公开日
    ES2670712B2|2018-10-08|
    WO2019158797A1|2019-08-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2005019118A1|2003-08-22|2005-03-03|Fmc Foret, S.A.|Method, devices and reagents which are used for wastewater treatment|
    WO2014083224A1|2012-11-28|2014-06-05|Universidad Autonoma De Madrid|Method for treating wastewater that comprises fenton oxidation and biological oxidation|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201830150A|ES2670712B2|2018-02-19|2018-02-19|Procedure and system of elimination of microcontaminants by reactor with magnetic nanoparticles and external separation unit|ES201830150A| ES2670712B2|2018-02-19|2018-02-19|Procedure and system of elimination of microcontaminants by reactor with magnetic nanoparticles and external separation unit|
    PCT/ES2019/070088| WO2019158797A1|2018-02-19|2019-02-18|Method and system for eliminating microcontaminants by means of a reactor with magnetic nanoparticles and an external separation unit|
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