• 专利附录
  • 专利说明
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    • 专利摘要:
    Batch procedure for continuous treatment of effluents by electrochemical techniques for their purification. It comprises performing a process of decolorization and/or oxidation of an effluent using electrochemical techniques, said effluent being subjected to: a pre-treatment process; an analysis of some properties of the effluent; a circulation through an electrochemical cell (El, E2) that contributes to the effluent oxidizing species, thus initiating the oxidation and/or discoloration of the effluent; next, one or several auxiliary tanks (T2, T3) are filled with the effluent; after a period of time the effluent in said auxiliary tanks (T2, T3) is a measure of the degree of discoloration and/or oxidation of the effluent and if the degree of discoloration and/or oxidation obtained is not greater than or equal to a threshold, a recirculation is initiated towards the electrochemical cell; When one of the auxiliary tanks (T2, T3) reaches or exceeds the degree of discoloration and/or fixed oxidation, it is discharged, or a reconstitution of the effluent is initiated. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2692244A1
    申请号:ES201730750
    申请日:2017-05-31
    公开日:2018-11-30
    发明作者:María Carmen GUTIÉRREZ BOUZAN；José Antonio TORNERO GARCÍA；Valentina BUSCIO OLIVERA；Mario GUTIÉRREZ MÉRIDA
    申请人:Universitat Politecnica de Catalunya UPC；
    IPC主号:
    专利说明:

    Batch procedure for continuous treatment of liquid effluents by electrochemical techniques for purification
    Technical sector
    The present invention deals with a batch procedure for continuous treatment of liquid effluents by electrochemical techniques for purification, and optional reuse. The procedure is performed in an installation that consists of different tanks that are filled sequentially according to the needs of the process. Also, the installation is equipped with different instruments / sensors to ensure that the characteristics and conditions of the effluent meet specific parameters for the treatment.
    Prior art
    By the ES-B1-2238933 patent, of the same holder as the present application, a process of treatment and reuse of textile effluents is already described by decolorization by electrochemical techniques, the subsequent optional irradiation with ultraviolet light and the reuse of discolored water and of the electrolyte and other auxiliaries that it contains in new dyeing processes. This procedure, however, provides a low intensity of the dyes, since it should be added in the order of an additional 20-50% dye to obtain an intensity similar to the dyes with net water. This is because the water to be reused contains certain compounds that should be removed before starting a new process.
    Patent ES-B1-2395318, also of the same holder as the present invention, describes a process for treating and reusing textile effluents by electrochemical techniques, wherein the residual dye bath is collected in an electrochemical cell and the treatment of the residual bath in the electrochemical cell combined with irradiation with ultraviolet light, reusing the discolored water and the electrolyte that it contains in a new dyeing process. Prior to the collection of the effluent in the electrochemical cell or after the treatment therein, an adjustment is made to pH less than 5, by adding HCl or H2SO4 depending on the dye electrolyte. Also, once the effluent has been treated, after the pH adjustment, an intermediate stage of reconstitution of the dye bath is carried out for later reuse in a new dyeing process. This procedure is


    more effective than the one described in patent ES-B1-2238933 since reusing the effluent does not require a greater amount of dye than when dyeing with mains water. However, it is not efficient because the effluent treatment and reconstitution process is much longer. It has also recently been found that it is not advisable to adjust the pH to 5 before electrochemical treatment because the life of the electrodes and the rest of the equipment components is significantly shortened.
    From the patent application US-A1-2015166383 a process and an industrial wastewater and / or drinking water treatment plant is known by means of electrochemical methods and advanced oxidation processes. The gravitational sedimentation preparation phase is followed by a main treatment consisting of electrocoagulation, electrooxidation and electroflotation through the action of metal electrode assemblies in parallel with ozone disinfection / oxidation, UV irradiation and ultrasonic treatment, as well as recirculation in the electromagnetic field. The next phase is the separation of the sediments from the clean water that is discharged through sand and activated carbon filters in order to eliminate the floating flocs in the collection tank. If necessary, water is subject to oxidation with the simultaneous action of ultraviolet (UV) and ozone irradiation for the purpose of final destruction of organic matter and ammonia, and possible residues of microbiological contamination.
    There is, therefore, the need to offer a new, more efficient and effective procedure for effluent treatment by electrochemical techniques for purification, and optional reuse, which allows continuous treatment of the procedure.
    Explanation of the invention.
    To that end, embodiments of the present invention provide a batch process for continuous treatment of effluents by electrochemical techniques for purification, and optional reuse, which comprises performing a process of decolorization and / or oxidation of an effluent from a supply duct of an industrial process using electrochemical techniques, said effluent being subjected to a pretreatment process by filtering and subsequently performing said pretreatment process the following steps:
    a) analyze properties of said pre-treated effluent by means of sensors such as a pH sensor, a temperature sensor, an electrical conductivity sensor and optionally a flowmeter;


    b) circulate the effluent through at least one electrochemical cell that has a temperature probe and that contributes to the effluent, by oxidation of the ions or molecules present in it, a number of oxidizing species, such as chlorine / hypochlorite, by volume unit thus initiating oxidation and / or discoloration of the effluent;
    c) sequentially filling at least two auxiliary tanks with the effluent from the electrochemical cell, which is at least one, to continue the oxidation and / or discoloration reaction with the oxidizing species generated in the electrochemical cell;
    d) after a period of time of the effluent in the two auxiliary tanks, perform, by means of a disposal sensor comprising a color sensor or an organic matter sensor, a measure of the degree of discoloration or oxidation of the effluent from an auxiliary tank of said two auxiliary tanks, and if the degree of discoloration or oxidation obtained is not greater than or equal to a threshold, initiate a recirculation of the effluent from said auxiliary tank to the electrochemical cell to generate new oxidizing species and return the treated effluent to said auxiliary tank until filling to continue the oxidation and / or discoloration process;
    e) once said auxiliary deposit has been filled, perform step d) for the other auxiliary deposit of said two auxiliary deposits; Y
    f) once one of the two auxiliary tanks has reached the degree of discoloration or oxidation set, after one or several recirculation sequences, discharge (i.e. pump out of the machine to be discarded, accumulated in an external or used tank in other applications) the effluent from the auxiliary reservoir that has reached the degree of fixed discoloration or oxidation or initiate a reconstitution of the effluent for reuse in an industrial process.
    Depending on the volume of the effluent to be treated, it may be necessary to use more than two auxiliary tanks. In this case, steps c) to f) described above would also be made for these additional deposits used.
    Preferably, stirring is carried out within each of the auxiliary tanks, for example by means of rotating blades or by air, among others, of the effluent. Preferably, the auxiliary tanks will be equipped with ultraviolet (UV) light sources to improve process performance.
    Likewise, preferably, before stage b), a stage of checking the results of the analysis of stage a) is carried out and if, depending on them, the effluent does not meet criteria for discoloration and / or oxidation by


    electrochemical process, the effluent is discarded through a branch section of the supply duct to a drain.
    In an exemplary embodiment, the process of reconstitution of the effluent is carried out only in the auxiliary tank of the auxiliary tanks that has been filled first in said step c). In this case, once the auxiliary tank that has been filled in second (taking the example of embodiment in which only two auxiliary tanks are used) has reached the degree of discoloration and / or oxidation set, after one or more sequences of recirculation, you can either discharge its effluent or send it to the auxiliary tank that has been filled first for reconstitution.
    According to the invention, for the reconstitution of the effluent for reuse in textile dyeing, i) firstly an acid is added to the effluent of the auxiliary reservoir that has first reached the fixed degree of discoloration (suppose it is the auxiliary reservoir that it was filled first), with stirring, until the effluent from said auxiliary tank reaches a first determined pH level, lower than 5, preferably pH = 3. Then, ii), a substance with alkaline (or alkali) properties is added to the auxiliary reservoir until the effluent reaches a second level of determined pH, preferably pH = 7. Next, iii) the effluent is irradiated with ultraviolet (UV) light installed in the auxiliary reservoir to degrade oxidizing species that have not reacted. Then, iv) the oxidant substances of the auxiliary tank effluent are determined by a sensor and a reducing agent is added to the auxiliary tank until all residual oxidant species are removed from the effluent. Finally v) the reconstituted effluent is conducted to an outlet tank of the industrial process supply duct for reuse.
    Optionally, according to the requirements for the application of the reconstituted effluent, for example in certain textile dyeing processes, depending on the dyeing process to be carried out, in the said outlet tank an amount of sodium chloride or another will be added, for which, the Outlet tank has chloride ion and / or conductivity sensors.
    In an exemplary embodiment, a polarity reversal step is also performed and, if necessary, a chemical acid cleaning of electrodes of the electrochemical cell, which is at least one.
    Brief description of the drawings


    The foregoing and other advantages and features will be more fully understood from the following detailed description of some embodiments with reference to the attached drawings, which should be taken by way of illustration and not limitation, in which:
    Fig. 1 shows a preferred embodiment of the installation or treatment plant for application of a batch procedure for continuous treatment of effluents by electrochemical techniques for purification and optional reuse.
    Fig. 2, in its two views 2a and 2b, is a flow chart that schematically illustrates the said procedure applied in the installation of Fig. 1.
    Figs. 3 to 6 show the different processes followed by the effluent in the installation of Fig. 1 for treatment.
    Fig. 7 shows the process followed by the effluent to maintain the electrode properties of the electrochemical cell (s) of the installation.
    Fig. 8 is a flowchart that schematically illustrates another exemplary embodiment of the proposed procedure.
    Detailed description of the invention and some examples of realization
    Figs. 1 and 2 (divided into 2a and 2b for better readability) show a preferred embodiment of an installation, and the corresponding procedure, for
    Continuous treatment of liquid effluents by electrochemical techniques for purification, and optional reuse. As can be seen in the aforementioned figures, the installation in this preferred embodiment comprises three auxiliary tanks T1, T2, T3 that will be filled sequentially according to the needs of the procedure. The installation, and the procedure, have been designed for batch operation. For this, the installation is equipped with different sensors to ensure that the effluent characteristics meet the quality requirements necessary for its treatment. According to this preferred embodiment, the effluent is separated into the three auxiliary tanks T1, T2, T3, each preferably being equipped with Mix stirring blades (Mix1, Mix2, Mix3, respectively) to facilitate homogenization of the effluent. Also, according to this preferred embodiment, the third auxiliary tank T3 is the only auxiliary tank equipped with a lamp, or lamps, of ultraviolet (UV) light to improve process performance and at the same time eliminate oxidizing species


    in excess of the effluent and with the necessary elements to prepare the effluent for reconstitution for reuse in an industrial dyeing process (not limiting, as this equipment could be included in any of the other two auxiliary tanks T1 or T2).
    The installation of Fig. 1 consists of:
    -  valves V1-V25, 2 or 3 positions;
    -  S-P1 and S-P2 pressure sensors;
    -  pH sensors S-pH1 and S-pH2;
    -  S-Chlorine chlorine sensor;
    -  S-Cond conductivity sensor;
    -  S-T1 temperature sensor;
    -  S-T2 temperature sensor, installed inside electrochemical cell E1;
    -  S-T3 temperature sensor, installed inside an electrochemical cell E2;
    -  S-Elim elimination sensor;
    - flow meter FM1;
    - F1 filter media;
    -  auxiliary tanks T1, T2, T3;
    -  acid dosage tanks T4 and T5;
    - T6 reducing agent tank;
    - tank with alkaline substances T7;
    -  Mixers Mix1, Mix2, Mix3;
    - UV1 UV lamp;
    -  electrochemical cells E1, E2;
    -  high level sensors LH1, LH2, LH3, LH4 and LH5
    -  low level sensors LL1, LL2, LL3, LL4, LL5 and LL6
    - P1-P7 pumps
    The T_ENTRADA and T_SALIDA input and output tanks are not part of the installation, but have only been included to illustrate an ideal industrial installation. The wastewater from different industrial processes is mixed in the T_ENTRADA inlet tank. This mixture will regulate the average conductivity of the wastewater to avoid extreme conductivity peaks in the installation. In this way, its overall efficiency will be increased. Once the effluent is completely treated, it is pumped to the outlet tank T_SALIDA.


    The different processes carried out by the proposed method according to the aforementioned preferred embodiment will be detailed below.
    First, an analysis of the conditions of the effluent to be treated is performed (see Fig. 3). At this stage, the inlet valve V12 of the installation opens to allow the effluent to enter. During its path, the effluent passes through a series of S-P1 and S-P2 pressure sensors and through F1 filtering means. The function of the filtration means F1 is to prevent a malfunction of the installation due to some wires, fibers or other suspended solids that can cause some problems of obstruction in the ducts and deterioration of the electrochemical cell (s) (s) E1, E2. The function of the pressure sensors S-P1 and S-P2 is to detect each time the filter media F1 is clogged and avoid cavitation that would damage the pump P1.
    After this pre-treatment process, the effluent passes through one or more sensors to analyze its properties. These sensors according to the aforementioned preferred embodiment include: a pH sensor S-pH1, a temperature sensor ST1, an electrical conductivity sensor S-Cond and a flow meter FM1.
    The aforementioned sensors are used to control the suitability of the effluent. The effluent does not pass through the electrochemical cell (s) E1, E2 if it does not meet pre-established quality criteria for its discoloration and / or oxidation. While the effluent does not reach this condition, the effluent is discarded through a bypass section into a drain. This reduces the damage of the electrodes of the electrochemical cell (s) E1, E2.
    Then, the auxiliary tanks T1, T2, T3 are filled (see Fig. 4). The process of filling the auxiliary tanks takes place through the electrochemical cell (s) E1, E2, so the process of decolorization and / or oxidation will begin immediately from the first moment that the effluent Enter the system. Depending on the volume of the effluent to be treated, there may be more or less recirculation tanks (that is, the tanks that are not equipped with the elements to prepare the effluent for reconstitution, in this case the auxiliary tanks T1 and T2). As mentioned above, in this preferred embodiment, three auxiliary tanks are used, using the tank that is first filled for reconstitution of the effluent, that is the auxiliary tank T3. Once the auxiliary tank T3 is full, the next to be filled is the auxiliary tank T2 and finally the auxiliary tank T1.


    Once the three auxiliary tanks T1, T2, T3 are full, the recirculation of the effluent through the cells is performed. Using the high level sensors LH1, LH2, LH3 installed in each of the three auxiliary tanks T1, T2, T3 it is checked when the tanks are full. At this point, the recirculation process begins with the auxiliary tank T3 (the one that was filled first) and will continue according to the order of filling the process (in this case T2 and then T1), following a typical scheme of 'First in Enter- First out '(FIFO in English). While one of the auxiliary tanks is used for recirculation, the other two are kept in storage. The storage optionally with stirring, and optionally also with UV irradiation, increases the efficiency of the process and reduces the electrical costs of the electrochemical treatment. This recirculation process is carried out with each auxiliary tank T1, T2, T3 until the S-Elim elimination sensor indicates that it is discolored or oxidized with the value equal to or greater than that established.
    When the S-Elim disposal sensor detects that the effluent is within the degree of discoloration or oxidation set, the effluent is redirected to the auxiliary tank T3. In this auxiliary tank T3, the effluent is prepared for possible reuse in an industrial process. While this process is taking place, the other two auxiliary tanks T1, T2 may be recirculating the effluent (see Fig. 5).
    Once the effluent has been discolored / oxidized and ready to be reused, it is conducted to an outlet tank T_SALIDA for reuse (see Fig. 6). The auxiliary tank that is empty will be filled to continue the process.
    This recirculation process is carried out with each auxiliary tank T1, T2, T3 until the S-Elim elimination sensor indicates that it is discolored / oxidized with the set value.
    It should be noted that the proposed installation, instead of including a single S-Elim disposal sensor to detect the degree of discoloration / oxidation of the effluent from each of the auxiliary tanks could include different disposal sensors, one for each auxiliary tank used in installation. In this case, each disposal sensor could be included in each auxiliary tank of the installation.
    Apart from the steps described above, in an exemplary embodiment, an additional step can also be considered for the maintenance of the electrodes of the electrochemical cell (s) E1, E2 (See Fig. 7). The electrode maintenance of the electrochemical cell (s) E1, E2 includes the polarity reversal of the


    electrodes and, if necessary, a chemical cleaning with acid, through the T4 acid dosing tank.
    In an exemplary embodiment, alternative to the preferred embodiment of Figs. 1 and 2 described above, in this case not illustrated, the installation comprises only two auxiliary tanks T2, T3 (not limiting because depending on the volume of the effluent to be treated, more auxiliary tanks can be used). According to this alternative embodiment, each of the two auxiliary tanks T2, T3 is equipped with one or more UV light lamps and preferably also, with Mix 2, Mix3 stirring blades to homogenize the effluent. Also, according to this embodiment, each of the two auxiliary tanks T2, T3 is also equipped with the necessary elements to prepare the effluent for reconstitution. That is, unlike the exemplary embodiment of Figs. 1 and 2, in which the reconstitution was carried out only in one of the auxiliary tanks of the installation, in particular in the auxiliary tank T3, in this case the reconstitution can be carried out in any of the auxiliary tanks of the installation. Therefore, once one of the two auxiliary tanks T2, T3 reaches the established degree of discoloration, either directly without recirculation or after one or several sequences of recirculation of the deposits in the electrochemical cell (s) ( s) E1, E2, the auxiliary reservoir that has first reached the degree of discoloration can initiate reconstitution.
    Referring now to Fig. 8, there is shown an example of a batch procedure for continuous treatment of effluents by electrochemical techniques, particularly to be implemented in an installation such as that of the alternative embodiment explained, it is that is, in which each of the auxiliary tanks is equipped with the necessary elements to prepare the effluent for reconstitution. The procedure illustrated in Fig. 8 performs a process of decolorization and / or oxidation of an effluent from an industrial process supply duct using electrochemical techniques, wherein the effluent, step 801, is subjected to a pre-process treatment by filtration and subsequently, step 802, to an analysis of the properties of the pre-treated effluent. When the effluent meets quality criteria, step 803, the effluent is circulated through one or more electrochemical cells (such as those in Fig. 1), where each cell has a temperature probe and contributes to the effluent, by oxidation of the ions or molecules present therein, an amount of oxidizing species per unit volume, such as chlorine / hypochlorite, thereby initiating oxidation


    and / or discolouration of the effluent. Then, step 804, the two auxiliary tanks T2, T3 are sequentially filled to continue the oxidation and / or discoloration reaction with the oxidizing species generated in the electrochemical cell (s) E1 or E2. After a period of time of the effluent in the two tanks T2, T3, a check, step 805, of the degree of discoloration or oxidation of the effluent of an auxiliary tank of said two auxiliary tanks T2, T3 is carried out (suppose first of all performs the check of the auxiliary tank that has been filled first, for example T3) and if the degree of discoloration or oxidation obtained is not greater
    or equal to a threshold, a recirculation of the effluent from the auxiliary tank T3 to the electrochemical cell (s) E1 or E2 is initiated and the effluent is returned to the auxiliary tank T3 until it is filled to continue the oxidation process and / or discoloration. Once the auxiliary tank T3 has been filled, the process of step 805 is repeated for the other auxiliary tank T2. Finally, step 806, the effluent from the auxiliary reservoir that has reached the degree of decolorization or fixed oxidation, either directly or after one or several recirculation sequences, can be discharged
    or alternatively a reconstitution of the same can be initiated for reuse in an industrial process, for example dyeing.
    The reconstitution of the effluent, according to the present invention, in any of the exemplary embodiments, consists in adding an acid to the effluent of the auxiliary reservoir which has reached the degree of decolorization or oxidation set until the effluent of said auxiliary reservoir reaches a first level determined pH, less than 5, preferably pH = 3. Subsequently, a substance with alkaline properties, for example alkali, is added to the auxiliary reservoir until the effluent reaches a second determined pH level, preferably pH = 7. The UV lamp is lit to degrade the oxidizing species present in the effluent. The residual oxidizing species in the effluent is determined by an S-Chlorine sensor and a reducing agent is added from the T6 tank until all residual oxidant species are removed from the effluent. Finally, the reconstituted effluent is conducted to the outlet tank T_SALIDA for reuse.
    A person skilled in the art could introduce changes and modifications in the described embodiments without departing from the scope of the invention as defined in the appended claims.

    权利要求:
    Claims (10)
    [1]
     Claims
    1. Batch procedure for continuous treatment of liquid effluents by electrochemical techniques for purification, which involves performing a process of decolorization and / or oxidation of an effluent from a water supply duct
    5 an industrial process using electrochemical techniques, said effluent being subjected to a pre-treatment process by filtration and subsequently performing the following steps to said pre-treatment process:
    a) analyze properties of said pre-treated effluent by means of sensors selected from a group comprising at least one pH sensor (S10 pH1), a temperature sensor (S-T1) and an electrical conductivity sensor (S-
    Cond), and optionally, a flow meter (FM1);
    b) circulate the effluent through at least one electrochemical cell (E1, E2) that has a temperature probe and that contributes to the effluent, by oxidation of the ions or molecules present in it, a quantity of oxidizing species by
    15 volume unit thus initiating oxidation and / or discoloration of the effluent; c) fill, sequentially, at least two auxiliary tanks (T2, T3) with the effluent from the electrochemical cell (E1, E2) to continue the oxidation and / or discoloration reaction with the oxidizing species generated in the electrochemical cell (E1 , E2), which is at least one;
    D) after a period of time of the effluent in said at least two auxiliary tanks (T2, T3), perform a measurement by means of a disposal sensor (S-Elim), including a color sensor or an organic matter sensor, of the degree of discoloration or removal of organic matter from the effluent of an auxiliary deposit of said at least two auxiliary deposits (T2, T3) and if the degree of
    25 decolorization / removal of organic matter obtained is not greater than or equal to a threshold, initiate a recirculation of the effluent from said auxiliary tank to the electrochemical cell (E1, E2) and return the effluent to said auxiliary tank until it is filled to continue the process oxidation and / or discoloration; e) once the aforementioned auxiliary tank has been filled, perform step d) to
    30 the other auxiliary deposit of said at least two auxiliary deposits (T2, T3); and f) once one of said at least two auxiliary tanks (T2, T3) has reached the degree of decolorization / elimination of organic matter fixed greater than or equal to said threshold, after one or more recirculation sequences, discharge the effluent from the tank auxiliary (T3) or auxiliary tank (T2), or start a
    35 reconstitution of the effluent for reuse in an industrial process.

    [2]
    2.  Method according to claim 1, characterized in that it comprises three (T1, T2, T3) or more auxiliary tanks depending on the volume of the effluent to be treated, with steps c) to f) mentioned for each of said auxiliary tanks.
    [3]
    3.  Method according to claim 1, characterized in that in step f) the auxiliary deposit that first reaches the degree of decolorization / removal of fixed organic matter is the auxiliary deposit of said two auxiliary deposits (T2, T3) that has been filled firstly in step c), the process comprising performing the effluent reconstitution process only in said auxiliary tank that has been first filled and further comprising, once the other auxiliary tank has also reached the degree of discoloration / disposal of fixed organic matter, either directly or after one or several recirculation sequences, discharge its effluent or send it to the auxiliary tank that has been filled in first for reconstitution.
    [4]
    Four.  Method according to claim 2, characterized in that in step f) the auxiliary deposit that first reaches the degree of decolorization / removal of fixed organic matter is the auxiliary deposit of said two auxiliary deposits (T2, T3) that has been filled firstly in step c), the process comprising performing the effluent reconstitution process only in said auxiliary tank that has been first filled and also comprising, sequentially, as the rest of the auxiliary deposits reach the degree of discoloration / removal of fixed organic matter, either directly or after one or several recirculation sequences, discharge its effluent or send it to the auxiliary tank that has been filled in first for reconstitution.
    [5]
    5.  Method according to the preceding claims, characterized in that the reconstitution of the effluent is carried out for reuse in the textile industry comprising:
    i) adding an acid to the auxiliary reservoir that has first reached the degree of decolorization set until the effluent of said auxiliary reservoir reaches a first determined pH level;
    ii) adding a substance with alkaline properties to the auxiliary reservoir of step i) until the effluent reaches a second determined pH level; iii) irradiate the effluent by ultraviolet light installed in the auxiliary reservoir to eliminate oxidizing species that have not reacted;

    iv) determine by means of a chlorine sensor (S-Chlorine) the remaining oxidizing species in the effluent of the auxiliary tank and add a reducing agent to the auxiliary tank until all residual oxidant species are removed from the effluent; Y
    v) lead the reconstituted effluent to an outlet tank (T_SALIDA) of the industrial process supply duct for reuse.
    [6]
    6.  Method according to claim 5, characterized in that it comprises adding a certain amount of sodium chloride in said outlet tank (T_SALIDA) depending on the dyeing process to be performed.
    [7]
    7.  Method according to claim 1 or 2, characterized in that within each of the auxiliary tanks (T1, T2, T3) further agitation of the effluent is performed.
    [8]
    8.  A method according to claim 1, characterized in that a stage for checking the results of the analysis of stage a) is carried out before stage b) and if the effluent does not meet criteria for treatment by a process based on them Electrochemical, the effluent is discarded through a branch section of the supply line to a drain.
    [9]
    9.  Method according to claim 1, characterized in that it further comprises performing a step of reversing the polarity of electrodes of the electrochemical cell (E1, E2), which is at least one.
    [10]
    10.  Method according to claim 9, characterized in that it further comprises performing a chemical acid cleaning of said electrodes of the electrochemical cell (E1, E2), which is at least one.

     Fig. 1 

     Fig. 2a 






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    同族专利:
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    ES2692244B2|2019-04-12|
    WO2018220251A1|2018-12-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0967178A1|1998-06-26|1999-12-29|Canon Kabushiki Kaisha|Method and apparatus for treating coloured liquid|
    ES2238933A1|2004-02-19|2005-09-01|Universitat Politecnica De Catalunya|Electrochemical treatment of textile fibre dyeing effluent comprises decolorizing, for ultraviolet irradiation and re-utilization of the process products|
    WO2008150541A1|2007-06-04|2008-12-11|Schwartzel David T|Aqueous treatment apparatus utilizing precursor materials and ultrasonics to generate customized oxidation-reduction-reactant chemistry environments in electrochemical cells and/or similar devices|
    ES2395318A1|2011-07-07|2013-02-11|Universitat Politècnica De Catalunya|Method for processing and reutilizing textile effluent using electrochemical techniques|
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201730750A|ES2692244B2|2017-05-31|2017-05-31|Batch procedure for continuous treatment of liquid effluents by electrochemical techniques for their purification|ES201730750A| ES2692244B2|2017-05-31|2017-05-31|Batch procedure for continuous treatment of liquid effluents by electrochemical techniques for their purification|
    PCT/ES2018/070395| WO2018220251A1|2017-05-31|2018-05-31|Batch process for continuous treatment of liquid effluents using electrochemical techniques for purifying same|
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