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WO2016046429A1 - Procédé de traitement, de réutilisation et de réduction de flux industriels aqueux - Google Patents

Procédé de traitement, de réutilisation et de réduction de flux industriels aqueux Download PDF

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Publication number
WO2016046429A1
WO2016046429A1 PCT/ES2015/070619 ES2015070619W WO2016046429A1 WO 2016046429 A1 WO2016046429 A1 WO 2016046429A1 ES 2015070619 W ES2015070619 W ES 2015070619W WO 2016046429 A1 WO2016046429 A1 WO 2016046429A1
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WO
WIPO (PCT)
Prior art keywords
stream
concentrated
osmotic solution
feed stream
industrial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/ES2015/070619
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English (en)
Spanish (es)
Inventor
Eneko BERDUGO MELGOSA
Abel Riaza Frutos
Francisco Javier BERNAOLA ECHEVARRÍA
Alfredo José RODRÍGUEZ ALARCÓN
José María VIÑAS CASTILLO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Abengoa Water SL
Original Assignee
Abengoa Water SL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abengoa Water SL filed Critical Abengoa Water SL
Publication of WO2016046429A1 publication Critical patent/WO2016046429A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/58—Multistep processes

Definitions

  • the present invention is encompassed in the field of aqueous industrial current treatment.
  • the method can be applied to any industrial sector in which aqueous currents of different osmotic pressure are treated and generated, these currents can be generated by different industries, such as the food, textile or similar industries.
  • industries such as the food, textile or similar industries.
  • the currents that are generated tend to be very polluting and difficult to treat, especially those with a high salt content, such as those produced in the food industry (making olives, pickles, salted fish), in the textile industry (tanning of skins), in the oil and gas industry, in landfill leaching, etc.
  • a high salt content such as those produced in the food industry (making olives, pickles, salted fish), in the textile industry (tanning of skins), in the oil and gas industry, in landfill leaching, etc.
  • the treatment or discharge of high volumes in an uncontrolled manner can cause serious environmental problems in ecosystems.
  • the table olive industry can be taken. It consumes between two and four cubic meters of water per ton of processed olive, thus producing a large volume of spills that are liquid streams with a high concentration of salts (commonly called olive brines), extreme pH values, high load of suspended solids, fats and oils, as well as a high content of organic matter.
  • salts commonly called olive brines
  • extreme pH values high load of suspended solids, fats and oils
  • ultrafiltration requires a preconditioning of the flow to be treated (flocculation with bentonite) and is usually used to complement other processes, such as reverse osmosis (EP1734013 A2) or direct (ES2364968 T3).
  • the output flow obtained in a direct osmosis stage from two saline solutions, one from a desalination plant and another from a tertiary treatment plant can be used to produce energy, taking advantage of the increase in hydraulic pressure; This is achieved thanks to the use of a module of reverse osmosis membranes to perform direct or natural osmosis.
  • Direct osmosis generates less membrane fouling, since it works at low hydraulic pressure and provides a high rejection of a wide variety of contaminants and salts.
  • fermentation brines mother brines
  • a new brine is prepared again, which entails a large consumption of water as well as a large generation of effluents whose treatment entails a great energy cost and with it a great economic cost.
  • the object of the present invention is to provide a new alternative to the known processes of treatment and recovery of aqueous streams and in particular, with salinity in the industry, such as brines.
  • the method illustrated below is based on the fact that in the treatment of aqueous industrial currents, when currents of different osmotic pressure coexist, there is the possibility of using direct osmosis as a process to recover and reuse water previously used in the industrial process and thus reduce the volume of effluent discharge, with the incentive of its low energy consumption compared to other separation processes, such as the reverse osmosis mentioned above.
  • the present invention relates to a method of treatment, reuse and minimization of aqueous industrial streams by direct osmosis between two streams that have different osmotic pressure, where the first is an aqueous industrial stream that has a lower osmotic pressure than the one facing , which is a concentrated osmotic solution. Therefore, the method generally comprises the following steps:
  • direct osmosis is understood as the process in which two currents that present different osmotic pressure in which the Hydrodynamic pressures of both streams can be the same or of different values, this difference being less than the difference in osmotic pressures of both streams.
  • a feed stream means an aqueous industrial stream of lower osmotic pressure than the current to be faced by direct osmosis.
  • the current facing the food is known as concentrated osmotic solution.
  • the feed stream that is obtained after subjecting it to the direct osmosis process is a concentrated feed stream; and the concentrated osmotic solution is diluted in the direct osmosis process resulting in a stream of dilute osmotic solution.
  • the solvent that receives the diluted osmotic solution must be extracted by some method (thermal, membranes, etc.) for its use, at the same time that said solution is reconcentrated to be reused in a new direct osmosis process as concentrated osmotic solution.
  • this step of solvent extraction and reconcentration is not carried out with the cost reduction that it entails compared to the conventional direct osmosis solution.
  • the diluted osmotic solution is capable of being used directly in an industrial process where said current is of interest given its properties.
  • the described method may comprise in a particular embodiment of the invention using the dilute osmotic solution stream as a current in the same industrial process from which the feed stream comes, using the diluted osmotic solution as a stream in said industrial process.
  • the described method may optionally comprise that the concentrated feed stream be either poured or treated at a lower cost, or used in an industrial process where said stream is of interest, given its properties.
  • the described method may optionally comprise that the concentrated feed stream be used as a stream in the same industrial process from which the feed stream comes, using this concentrated feed stream as the stream in said industrial process.
  • the described method may additionally comprise a stage of pretreatment of the feed stream before being introduced into the module or modules of at least one membrane where the direct osmosis is carried out, to condition and eliminate the contaminating charges different from those salts that it contains and that can affect said direct osmosis process; This is because its properties vary depending on the industrial process from which the current comes.
  • the method may contain a stage of conditioning the diluted osmotic solution before being directed and integrated into the industrial process where it is to be used as an aqueous feed stream, for example of the fermentation process of the olive.
  • This conditioning may comprise dilution, dosage of some reagent, etc. of the diluted osmotic solution.
  • the described method may further comprise a stage of pretreatment of the concentrated osmotic solution stream before being introduced into the membrane module or modules, to condition and eliminate the contaminating charges other than the salts it contains.
  • it may contain a stage of conditioning the concentrated feed stream before being directed to an industrial process of interest given its properties.
  • frame an element widely known in the technical field of osmosis, it should be understood the structure that supports the membrane module or modules, and which has the corresponding means of input and output of currents in said modules.
  • the invention can be carried out with a single frame, or with more than one; In turn, the same frame allows the configuration of a single treatment line through all membrane modules, in an interconnected way, or the configuration of more than one independent treatment line, according to the industrial interests of the procedure.
  • the direct osmosis process can be carried out by configuring the modules in series or in parallel, by passing the currents in a current or countercurrent, as well as operating the plant in one or several stages.
  • a membrane module is the element with a specific configuration in which the membrane or semipermeable membranes whose faces / sides are in contact with the currents that participate in the direct osmosis process is housed.
  • the module also has connectors, points of entry and exit of the currents and must allow cleaning of the membrane or membranes to reduce fouling and the concentration of internal and external polarization.
  • modules There are different types of modules depending on the configuration adopted and / or the type of membrane used:
  • a direct osmosis system may contain one or more modules to carry out the described treatment method.
  • the semipermeable membrane is a direct osmosis semipermeable membrane.
  • the present invention relates to a method of treating aqueous industrial streams that have different osmotic pressure.
  • aqueous industrial streams of saline content presenting different osmotic pressure.
  • the feed stream is a salt water stream.
  • Said feed current of saline content is characterized by having a conductivity greater than 2500 ⁇ / ⁇ at 25 ° C and / or with a total dissolved solids content (TDS) equal to or greater than 0.5 g / l, regardless of the industrial process from which it comes.
  • the salt content feed stream is the saline effluent from an industry selected from the group consisting of: agrifood, textile, oil and gas industry or landfill leaching, among others. More preferably, the agri-food industry is the olive, cheese, pickles and salted fish.
  • the textile industry is preferably of tanned skins, so that the industrial output current in these is a current of brine.
  • the feed to be treated is an aqueous stream or brine having a salt concentration greater than or equal to 35 g / l of TDS and / or an electrical conductivity greater than 50 mS / cm at 25 ° C , where the most abundant salt is sodium chloride (NaCI); This is, for example, the case of brines from table olives, which is the most preferred case of all.
  • NaCI sodium chloride
  • the concentrated osmotic solution can have any degree of salinity and origin, but always with the condition that the value of the osmotic pressure is greater than that of the feed stream of saline content to be treated, and never exceeds the limit of saturation of the salts used as solute; since only in this way is the desired direct osmosis phenomenon achieved.
  • the concentrated osmotic solution is usually saline water, for example concentrated brine.
  • This salinity is produced by its NaCI content, although it may contain other salts or compounds that vary the degree of salinity.
  • the concentrated osmotic solution has a salt concentration equal to or greater than 200 g / l (measured in NaCl concentration).
  • the process of the present invention which is based on the treatment, reuse and minimization of industrial currents in direct osmosis, has the advantage over reverse osmosis of not requiring an external supply of high hydraulic pressure, so that the Energy consumption is low, thus reducing operating costs. Since it does not require high hydraulic pressure, it has a lower tendency to fouling, which implies an additional saving in the cleaning costs of the membrane or membranes.
  • a constant (continuous) feed on both sides of each of the membranes is applied to the semipermeable membrane module, in order to achieve high separation efficiency by keeping the difference in osmotic pressures constant between The two currents facing each other.
  • the feeding of currents into the membrane module can be carried out batchwise.
  • a second object of the present invention is constituted by an installation for the treatment, reuse and minimization of aqueous industrial streams that present different osmotic pressure by means of direct osmosis according to the method described above, in any of its variants, comprising:
  • the module comprises means of input of the two opposite currents, of feeding and of concentrated osmotic solution; and means of output of the two streams resulting from direct osmosis, concentrated feed and diluted osmotic solution, and
  • This installation may additionally comprise means for pretreatment of the feed stream before being introduced into the module or membrane modules to carry out direct osmosis.
  • it may contain means for conditioning the dilute osmotic solution stream before being directed by the conduction means to the industrial process from which the feed stream comes.
  • This installation may additionally comprise means for pretreatment of the concentrated osmotic solution stream before being introduced into the module or membrane modules to carry out direct osmosis.
  • it may contain means for conditioning the concentrated feed stream before being directed to an industrial process of interest given its properties.
  • a saline content feed stream is preferably treated in the installation of the present invention.
  • this installation can be coupled as a constituent element of the industrial plant from which the feed stream of salt content is extracted, such that the invention also contemplates as an object of protection an industrial plant comprising the treatment installation , reuse and minimization of the industrial feed stream described above, said installation being coupled at its entrance to the evacuation line of the salt supply current of the plant, and at its exit at the entrance of the water line of plant.
  • These inputs and outputs of the installation and the plant are connected by means of conduction and channeling of the currents.
  • This industrial plant is preferably a plant of any sector in which aqueous streams of different osmotic pressure are treated and generated, such as the agri-food, textile or similar industries. Particularly, in a preferred case, it is an industrial plant producing table olives.
  • FIGURE 1 STATE OF THE TECHNIQUE.
  • FIGURE 2 (INVENTION). Essential scheme of the process of treatment, reuse and minimization of an aqueous industrial current.
  • a module with a single semi-permeable membrane is used for a feed current, by simplifying the figure and its explanation.
  • FIGURE 3 Scheme of the process of treatment, reuse and minimization of an industrial salt stream in accordance with the present invention as illustrated in Figure 2, but which also incorporates optional means of pretreatment and conditioning of the input streams, both Osmosis module as to the industrial production line of the plant. Also in this case, a semipermeable membrane module with a single membrane is used, by simplifying the figure and its explanation.
  • FIGURE 4 Detail of the current balance in the direct osmosis process that takes place according to the method described in the present invention, according to Example 1.
  • Power module output socket (9). 1 Diluted osmotic solution stream.
  • the stream of dilute osmotic solution (11) leaving the semipermeable membrane module (2), inside which the direct osmosis process has taken place when facing the feed stream of the saline content of the process to be treated (1) and the stream of concentrated osmotic solution (6) is directed to a device for reconcentration of the osmotic solution (13), in which a stream of concentrated osmotic solution (6) and a stream of recovered water is obtained again.
  • the concentrated osmotic solution stream (6) is redirected to the semipermeable membrane module (2) contained in the membrane module rack (3).
  • the method of the present invention dispenses with said step to reconcentrate the osmotic solution and regenerate a concentrated osmotic solution stream, and instead, the diluted osmotic solution stream is used. (11) as input current in the industrial process.
  • FIG. 2 which illustrates the present invention, it starts from a feed stream of process salt content to be treated (1) by means of the direct osmosis process.
  • the semipermeable membrane module (2) contained in the membrane module frame (3) has two input / power sockets to the module (5, 7) and two module output sockets (10, 12) for the currents, an input socket and an outlet socket on each side of the semipermeable membrane.
  • the feed stream of the process salt content to be treated (1) is passed and through the other input / feed socket to the module (7) the concentrated osmotic dissolution current ( 6), with greater osmotic pressure than the feed stream of the process salt content to be treated (1). Both currents are separated by a semipermeable membrane (4).
  • a solvent flow occurs, in this case it is water, which crosses the membrane by direct osmosis phenomenon (8) from the stream of lower osmotic pressure that is the feed stream of process saline content to be treated (1) at the current of higher osmotic pressure, which is the concentrated osmotic dissolution stream (6).
  • the feed stream of process salt content to be treated (1) upon losing part of the water content, is concentrated and leaves the semipermeable membrane module (2) as feed stream of concentrated salt content (9).
  • the stream of concentrated osmotic solution (6) gains water, leaving the process as a dilute osmotic solution (11).
  • the feed stream of concentrated saline content (9) can be poured into evaporation rafts or treated in evaporators at a lower cost as the volume of the initial stream has been reduced or used in an industrial process.
  • the diluted osmotic solution (1 1) is the current that goes back to the industrial plant (18) from which the feed stream of the saline content of the process to be treated comes (1).
  • the method of the present invention eliminates the highest cost stage in the traditional direct osmosis process for the treatment of aqueous currents (see Figure 1), which is the stage of reconcentration of the osmotic solution.
  • the direct osmosis process usually has a second stage associated to reconcentrate the osmotic solution used in the preparation of the osmotic solution, as may be be a reverse osmosis process, nanofitlration, thermal processes, etc., depending on the type of solute, a stage that is represented in Figure 1 of the state of the art by means of the osmotic solution reconcentration device (13).
  • the operating temperature at which the method of treatment, reuse and minimization of the industrial salt currents object of interest of this patent can be carried out is between 0 ° C and 75 ° C, with a temperature between 15 ° being preferable C and 30 ° C.
  • the most advisable thing is that the temperature of the two input currents, although independent of one another, is similar.
  • any expert knows that slight variations, such as an increase in temperature within the range described here, favors the solubility of the salt, and therefore increases the osmotic pressure, always taking into account that these variations in the properties of the method must be supported by the semipermeable membrane.
  • conditioning or adjustment means prior to the dilute osmotic solution stream (11) after leaving the semipermeable membrane module (2) and prior to entering the line of industrial production of the plant (18) from which the feed stream of the saline content of the process to be treated (1) comes from, in a conditioning module (19) Designed for this purpose.
  • This module may involve dilution, dosage of some reagent, etc. depending on the properties of said dilute osmotic solution stream (11).
  • Example 1 Process of treatment, reuse and minimization of industrial currents of saline content by means of direct osmosis according to the present invention, applied to an output current of a table olive production plant.
  • the operating temperature was 23 ° C.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention se rapporte à un procédé de traitement, de réutilisation et de réduction de flux industriels aqueux présentant différentes pressions osmotiques, au moyen d'une osmose directe. L'invention consiste à mettre en contact deux flux de pression osmotique différente séparés par une membrane semi-perméable. Sous l'effet de la différence de pressions osmotiques entre les deux flux, le flux à pression osmotique plus basse cède une partie de sa teneur en liquide ou en solvant au flux à pression osmotique plus élevée. On obtient ainsi par osmose directe un flux concentré à pression plus faible et un flux dilué à pression plus élevée. Au lieu d'être traité une nouvelle fois pour être reconcentré, ce flux dilué à pression osmotique plus élevée peut être dirigé vers un processus industriel dans lequel présente une utilité du fait de ses propriétés et utilisé dans ledit processus industriel.
PCT/ES2015/070619 2014-09-26 2015-08-11 Procédé de traitement, de réutilisation et de réduction de flux industriels aqueux Ceased WO2016046429A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201431417A ES2567978B1 (es) 2014-09-26 2014-09-26 Método de tratamiento, reutilización y minimización de corrientes industriales acuosas
ESP201431417 2014-09-26

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WO2016046429A1 true WO2016046429A1 (fr) 2016-03-31

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007147013A1 (fr) * 2006-06-13 2007-12-21 Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Reno Systèmes d'osmose directe à distillation par membrane combinée et procédés d'utilisation
US20120267308A1 (en) * 2011-04-25 2012-10-25 Trevi Systems Inc. Recovery of retrograde soluble solute for forward osmosis water treatment
WO2013164541A2 (fr) * 2012-05-02 2013-11-07 Total Sa Production d'energie par osmose directe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007147013A1 (fr) * 2006-06-13 2007-12-21 Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Reno Systèmes d'osmose directe à distillation par membrane combinée et procédés d'utilisation
US20120267308A1 (en) * 2011-04-25 2012-10-25 Trevi Systems Inc. Recovery of retrograde soluble solute for forward osmosis water treatment
WO2013164541A2 (fr) * 2012-05-02 2013-11-07 Total Sa Production d'energie par osmose directe

Also Published As

Publication number Publication date
ES2567978B1 (es) 2017-02-01
ES2567978A1 (es) 2016-04-26

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