EP3983115A1 - Procédé membranaire de potabilisation d'eaux de surface sans ajout de séquestrant - Google Patents
Procédé membranaire de potabilisation d'eaux de surface sans ajout de séquestrantInfo
- Publication number
- EP3983115A1 EP3983115A1 EP20731119.2A EP20731119A EP3983115A1 EP 3983115 A1 EP3983115 A1 EP 3983115A1 EP 20731119 A EP20731119 A EP 20731119A EP 3983115 A1 EP3983115 A1 EP 3983115A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nanofiltration
- water
- carried out
- membrane
- concentrate
- 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.)
- Pending
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000002352 surface water Substances 0.000 title claims abstract description 14
- 239000003352 sequestering agent Substances 0.000 title description 3
- 238000001728 nano-filtration Methods 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000012141 concentrate Substances 0.000 claims abstract description 26
- 239000012466 permeate Substances 0.000 claims abstract description 20
- 239000005416 organic matter Substances 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 38
- 230000008569 process Effects 0.000 claims description 28
- 238000009434 installation Methods 0.000 claims description 24
- 238000000108 ultra-filtration Methods 0.000 claims description 16
- 238000001471 micro-filtration Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 13
- 239000000047 product Substances 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 238000005374 membrane filtration Methods 0.000 claims description 8
- 239000000701 coagulant Substances 0.000 claims description 6
- 208000029422 Hypernatremia Diseases 0.000 claims description 5
- 229920006393 polyether sulfone Polymers 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004695 Polyether sulfone Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 230000000395 remineralizing effect Effects 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 description 12
- 239000000126 substance Substances 0.000 description 9
- 238000001223 reverse osmosis Methods 0.000 description 7
- 239000003651 drinking water Substances 0.000 description 6
- 235000020188 drinking water Nutrition 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 102000007530 Neurofibromin 1 Human genes 0.000 description 3
- 108010085793 Neurofibromin 1 Proteins 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000005446 dissolved organic matter Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000001944 accentuation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
-
- 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
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
- B01D61/0271—Nanofiltration comprising multiple nanofiltration steps
-
- 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
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- 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
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/147—Microfiltration
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/06—Specific process operations in the permeate stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/26—Further operations combined with membrane separation processes
- B01D2311/2626—Absorption or adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/26—Further operations combined with membrane separation processes
- B01D2311/263—Chemical reaction
- B01D2311/2634—Oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/26—Further operations combined with membrane separation processes
- B01D2311/2649—Filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2317/00—Membrane module arrangements within a plant or an apparatus
- B01D2317/02—Elements in series
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/20—Specific permeability or cut-off range
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Definitions
- TITLE MEMBRANARY PROCESS FOR POTABILIZING SURFACE WATER WITHOUT ADDING SEQUESTRANT DOMAIN
- the field of the invention is that of the purification of surface water.
- the invention relates to a process for making surface water (water from rivers or lakes essentially) drinkable by filtration thereof using membranes.
- activated carbon has a porous structure making it possible to retain a wide range of contaminants.
- the presence of a high concentration of organic matter tends to quickly saturate the macropores and part of the mesopores with activated carbon.
- the activated carbon reactor then requires greater dosages in order to treat the organic matter and produce quality water that meets standards.
- these activated carbon processes are not suitable for treating water exhibiting a strong coloration, linked to a high concentration of humic substances, since they would generate prohibitive operating costs for this.
- Membrane filtration processes are commonly used in the production of drinking water.
- the membranes which they use have a porous structure which allows them to retain not only the suspended matter but also the dissolved matter.
- microfiltration membranes have pores of 0.1 ⁇ m to 10 ⁇ m, those of ultrafiltration pores from 10 ⁇ m to 0.1 ⁇ m, those of nanofiltration have pores of a few nanometers and reverse osmosis membranes have a even denser structure. Reverse osmosis membranes thus make it possible to retain almost all of the solutes. They are widely used to produce drinking water from seawater or brackish water.
- nanofiltration or reverse osmosis membrane filtration processes lead to water losses ranging between 15% and 30% and therefore to concentrates which cannot be rejected before specific treatment in the natural environment.
- the filtered water obtained by nanofiltration or reverse osmosis membranes must undergo remineralization because passage through the membranes also removes bivalent ions (nanofiltration) and monovalent ions (reverse osmosis).
- nanofiltration or reverse osmosis membranes used to make water drinkable have the drawback of clogging over time and requiring the use of chemicals, called anti-scalants or sequestering agents, to delay this process. .
- These sequestering products can be harmful to the environment.
- the surface water to be made drinkable has a more accentuated color than before.
- This coloring which is linked the presence of humic substances in these waters, results from the degradation of plants in the area where surface water is collected. Global warming would be one of the causes of the accentuation of the color of these waters.
- the current response is to increase the doses of chemicals used to reduce the organic matter content thereof, consequently leading to an increase in the production of sludge.
- An objective of the present invention is to provide a process for making surface water drinkable by membrane means, making it possible to dispense with the use of any sequestering product.
- An objective of the present invention is also to disclose such a drinking water process that does not require any remineralization of the treated water.
- Another objective of the present invention is to disclose such a process for drinking water which makes it possible, in at least some of its embodiments, to also dispense with the use of any coagulating agent or any flocculating product.
- Yet another object of the invention is to provide such a process which results in the production of little or no sludge.
- Another objective of the present invention is to provide such a method making it possible to operate the membrane dies with higher hydraulic yields than those which can be obtained with the methods of the prior art.
- said nanofiltration step is carried out on a nanofiltration installation comprising a single stage.
- said nanofiltration step is carried out on a nanofiltration installation comprising two stages connected in series.
- said method comprises a step of microfiltration or ultrafiltration of said water, prior to said nanofiltration step, said preliminary step being carried out on at least one microfiltration or ultrafiltration membrane having a breaking capacity of between 10 nm and 1 miti, said ultrafiltration step and said nanofiltration step being implemented with an overall conversion rate greater than 90%.
- the process preferably comprises a sieving step provided upstream of said microfiltration or ultrafiltration step, said sieving step being carried out with a breaking capacity of between 20 miti and 200 miti and preferably between 20 miti and 50 miti, said process then being carried out in the absence of any addition of coagulant and / or flocculant.
- the process according to the invention advantageously comprises an additional step of adsorption on activated carbon, said step allowing the reduction in the content of said water in micropollutants.
- the present invention thus makes it possible to reduce the content of residual organic matter at the entry of the adsorption stage on activated carbon. The dosages of activated carbon are thus minimized while ensuring the elimination of residual organic matter and micropollutants.
- all or part of said concentrate resulting from said nanofiltration step is conveyed to said step of adsorption on activated carbon.
- the concentrate sent to the activated carbon adsorption stage can come from these two stages. This makes it possible to increase the overall hydraulic efficiency of the process.
- nanofiltration produces a concentrate loaded with organic matter which is liquid waste. The recovery of part of this concentrated liquid and its treatment on activated carbon therefore makes it possible to reduce water losses and ultimately increase the overall efficiency of the installation.
- the additional adsorption step is carried out in the presence of ozone.
- the ozone intended to degrade the micro-pollutants adsorbed on the activated carbon, can thus be injected directly into a reactor accommodating the activated carbon or, according to an alternative, into the concentrate conveyed to the latter.
- the nanofiltration membranes used are polyethersulfone membranes. This material is compatible with the use of high levels of free chlorine of between 200 ppm and 1000 ppm making it possible to limit the risk of biofouling which is often present due to the high content of natural organic materials in the water to be treated.
- said nanofiltration step is carried out without any recirculation of concentrate at the top of the membranes.
- the nanofiltration membranes used preferably have a salt retention rate of less than 15%, that is to say that they do not retain more than 15% of the salt concentration of the liquid that they filter. .
- Nanofiltration membranes which only slightly retain salts will be chosen preferentially.
- Nanofiltration membranes in particular those made of polyethersulfones, are generally marketed indicating a high salt retention rate. The inventors therefore had to carry out numerous tests before finding membranes suitable for this preferential variant of the invention, exhibiting a salt retention rate of less than 15%.
- Figure 1 schematically represents a first embodiment of an installation for implementing the method according to the invention
- FIG. 2 schematically represents a second embodiment of an installation for implementing the method according to the invention
- FIG. 3 schematically represents a third embodiment of an installation for implementing the method according to the invention.
- FIG. 4 diagrammatically represents a third embodiment of an installation for implementing the method according to the invention.
- FIG. 5 is a curve showing the maintenance over time of the permeability of the nanofiltration membranes of the installation shown in FIG. 4;
- an installation for implementing the method according to the invention comprises an inlet 1 of raw water to be treated, a screening module D comprising a sieve having a breaking capacity of 30 miti, a first membrane filtration module comprising an ultrafiltration or microfiltration membrane 0 and a membrane filtration module comprising a nanofiltration membrane 2 which filters the permeate originating from said ultrafiltration or microfiltration membrane.
- an installation for implementing the method according to the invention comprises an inlet 1 of pre-treated water, a membrane filtration module comprising a nanofiltration membrane 2, a reactor containing activated carbon 3, and a filtered water outlet 4.
- a pipe 5 for discharging the concentrate produced by the membrane is connected to a pipe 6 allowing part of this concentrate to be conveyed to a pipe 7 for discharging the permeate, this pipe conveying this mixture to the activated carbon reactor 3.
- the nanofiltration is organized in a single stage.
- the hydraulic efficiency of such a membrane die is 98.5%, corresponding to a water loss of only 1.5%.
- the third embodiment of an installation for implementing the method according to the invention comprises two nanofiltration stages connected in series.
- two membrane filtration units each comprise a nanofiltration membrane 2, 2a.
- the concentrate produced by the first membrane 2 is partly treated by the second membrane 2a.
- the other part is mixed with the permeate produced by this first membrane 2.
- the permeate produced by the second membrane is mixed with the permeate produced by the first membrane.
- the concentrate produced by the second membrane is, in part, evacuated by a pipe 5a towards the natural environment, while the other part of this concentrate is conveyed by a pipe 6a towards the pipe 7 for evacuating the permeate from said first membrane. in order to be mixed with this permeate.
- the total permeate is then conveyed by a line 8 to a stage B of adsorption on activated carbon.
- the hydraulic efficiency of such a membrane die is greater than 99%.
- This installation implements a first micro-filtration step (M) followed by an ultrafiltration step (U) followed by a nanofiltration step.
- microfiltration membranes have a cutoff of 0.5 ⁇ m.
- Ultrafiltration membranes for their part have a cut-off threshold of 0.02 ⁇ m.
- the nanofiltration step comprises two stages (NF 1, NF 2) connected in series. Each filtration stage is equipped with three nanofiltration membranes each having a membrane surface area of 37 m 2 . The installation thus develops a total nanofiltration surface area of 222m 2 .
- the water after safety filtration during the microfiltration step (M), and after having been ultrafiltered during the ultrafiltration step (U), is conveyed to the first nanofiltration stage (NF1 ) according to a conversion rate 50%, which means that 100% of the volume of the water to be treated makes it possible to obtain 50% of the volume of permeate and 50% of the volume of concentrate.
- the concentrate produced by this first filtration stage (NF1) is conveyed entirely to the second filtration stage (NF 2) to be filtered there according to a conversion rate of 90%, which means that 100% of the volume of concentrate of the first filtration stage makes it possible to obtain 90% of permeate volume and 10% of concentrate volume.
- the concentrate produced by the second filtration step is evacuated through a pipe to the natural environment.
- the permeates from the first and second nanofiltration stages are mixed.
- the conversion rate of the nanofiltration step is 95%, which means that 100% of the volume of the water to be treated entering this step makes it possible to obtain 95% of the volume of permeate and 5 % volume of concentrate.
- the nanofiltration membranes used are sulfonated polyethersulfone membranes marketed by the company Hydranautics under the name HydraCoreRe 50 LD. These membranes have a breaking capacity of 1000 Da.
- This cut-off threshold of 1000 Da is in fact sufficiently fine to treat the organic matter and the color of the water but high enough not to change the mineralization of the water, eliminating the need to remineralize the water following the treatment.
- the nanofiltration membrane used allows ions to pass, which helps to reduce the supply pressure and thereby reduce energy consumption.
- the supply pressure is 10 bars (NF 90 at a temperature of 15 ° C and conversion rate of 85% and with three filtration stages), which results in an energy consumption of 365 W. h / m 3 of treated water.
- the open nanofiltration membrane used in the context of the present invention having a cut-off threshold of 1000 Da, the supply pressure is only 5 bars (at a temperature of 15 ° C. and a conversion rate of 95%). Energy consumption is thus reduced to 150 Wh / m 3 of treated water.
- Table 1 indicates the reductions in the parameters of color, turbidity and dissolved organic matter obtained thanks to the overall treatment process shown in Figure 1.
- Table 2 below shows the water quality parameters before and after treatment by nanofiltration followed by the activated carbon reactor according to the invention using the installation shown in FIG. 2.
- the permeability of the membranes was calculated by dividing the flow corrected at 20 ° C (expressed in L / hm 2 ) by the transmembrane pressure necessary for filtration.
- the alkalinity levels of the water to be treated and of the nanofiltered water was regularly measured five times over the entire duration of the test and the rate of retention of alkalinity in these water by the filtration membranes was calculated.
- the results of these measurements are shown in figure 7 on which the order of the five measurements taken is shown on the abscissa, the alkalimetric strength of the water expressed in French degrees (° f) is on the left ordinate and the reduction rate of alkalinity expressed in% is shown on the right ordinate.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1906187A FR3097220B1 (fr) | 2019-06-11 | 2019-06-11 | Procede membranaire de potabilisation d’eaux de surface sans ajout de sequestrant |
PCT/EP2020/066193 WO2020249668A1 (fr) | 2019-06-11 | 2020-06-11 | Procede membranaire de potabilisation d'eaux de surface sans ajout de sequestrant |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3983115A1 true EP3983115A1 (fr) | 2022-04-20 |
Family
ID=68210955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20731119.2A Pending EP3983115A1 (fr) | 2019-06-11 | 2020-06-11 | Procédé membranaire de potabilisation d'eaux de surface sans ajout de séquestrant |
Country Status (6)
Country | Link |
---|---|
US (1) | US20220259086A1 (fr) |
EP (1) | EP3983115A1 (fr) |
CA (1) | CA3141392A1 (fr) |
FR (1) | FR3097220B1 (fr) |
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FR2678260B1 (fr) * | 1991-06-26 | 1994-02-18 | Otv Sa | Chaine de traitement des eaux de surface a barriere de securite, barriere de securite, et applications correspondantes. |
AU7097800A (en) * | 1999-09-02 | 2001-03-26 | Pall Corporation | Water treatment systems and methods |
US6824695B2 (en) * | 2003-02-28 | 2004-11-30 | Gerard F. Tempest, Jr. | System and method for water purification |
JP4305905B2 (ja) * | 2003-10-28 | 2009-07-29 | オルガノ株式会社 | 排水処理方法および装置 |
US20090101583A1 (en) * | 2006-03-20 | 2009-04-23 | Mordechai Perry | Hybrid membrane module, system and process for treatment of industrial wastewater |
FR2927622B1 (fr) * | 2008-02-14 | 2014-08-01 | Otv Sa | Procede de traitement d'eau par systeme membranaire de type nanofiltration ou osmose inverse permettant des taux de conversion eleves grace a l'elimination de la matiere organique. |
US8523965B2 (en) * | 2012-02-07 | 2013-09-03 | Doulos Technologies Llc | Treating waste streams with organic content |
KR101550702B1 (ko) * | 2012-09-26 | 2015-09-07 | 코웨이 주식회사 | 높은 회수율로 정수 생산을 위한 막여과 정수 처리 시스템 및 방법 |
US10287201B2 (en) * | 2013-01-18 | 2019-05-14 | Chevron U.S.A. Inc. | Methods and systems for treating produced water |
FR3022901B1 (fr) * | 2014-06-27 | 2016-07-01 | Veolia Water Solutions & Tech | Procede de traitement d'un flux d'eaux usees par filtration basse pression |
US20180170769A1 (en) * | 2015-03-31 | 2018-06-21 | ClearCove Systems, Inc. | Method for processing waste water |
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- 2020-06-11 US US17/618,022 patent/US20220259086A1/en active Pending
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FR3097220A1 (fr) | 2020-12-18 |
FR3097220B1 (fr) | 2021-11-19 |
CA3141392A1 (fr) | 2020-12-17 |
WO2020249668A1 (fr) | 2020-12-17 |
US20220259086A1 (en) | 2022-08-18 |
MX2021015226A (es) | 2022-01-18 |
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