CA3034877A1 - Treatment of sludges and flocculants using insoluble magnesium hydroxide colloidal suspensions - Google Patents
Treatment of sludges and flocculants using insoluble magnesium hydroxide colloidal suspensions Download PDFInfo
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- CA3034877A1 CA3034877A1 CA3034877A CA3034877A CA3034877A1 CA 3034877 A1 CA3034877 A1 CA 3034877A1 CA 3034877 A CA3034877 A CA 3034877A CA 3034877 A CA3034877 A CA 3034877A CA 3034877 A1 CA3034877 A1 CA 3034877A1
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- sludge
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- sludges
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- 239000000725 suspension Substances 0.000 title claims abstract description 29
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 title claims abstract description 18
- 239000000347 magnesium hydroxide Substances 0.000 title claims abstract description 18
- 229910001862 magnesium hydroxide Inorganic materials 0.000 title claims abstract description 18
- 239000008394 flocculating agent Substances 0.000 title abstract description 9
- 239000010802 sludge Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 33
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 12
- 239000011707 mineral Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000000701 coagulant Substances 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 19
- 239000002351 wastewater Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000009300 dissolved air flotation Methods 0.000 claims description 5
- 230000006872 improvement Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 1
- 230000005484 gravity Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 description 20
- 239000003921 oil Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000005345 coagulation Methods 0.000 description 6
- 230000015271 coagulation Effects 0.000 description 6
- 238000005189 flocculation Methods 0.000 description 6
- 230000016615 flocculation Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 5
- 239000008186 active pharmaceutical agent Substances 0.000 description 4
- 230000001687 destabilization Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001246 colloidal dispersion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000005406 washing 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A method of separating sludge which involves adding an insoluble mineral colloidal suspension into an industrial sludge to destabilize the industrial sludge and separating destabilized components of the industrial sludge. The insoluble mineral colloidal suspension includes magnesium hydroxide. In an alternative embodiment dry finely divided magnesium hydroxide can be added and then dispersed into an industrial sludge. Conventional flocculants and/or coagulants can also be added. Conventional physical separation processes can be used to separate the destabilized industrial sludge.
Description
TREATMENT OF SLUDGES AND FLOCCULANTS USING INSOLUBLE
MAGNESIUM HYDROXIDE COLLOIDAL SUSPENSIONS
BACKGROUND
[0001] The present invention relates generally to separating sludges and more particularly to the use of insoluble magnesium hydroxide colloidal suspensions that can be added to sludges and/or floats to aid in separation.
MAGNESIUM HYDROXIDE COLLOIDAL SUSPENSIONS
BACKGROUND
[0001] The present invention relates generally to separating sludges and more particularly to the use of insoluble magnesium hydroxide colloidal suspensions that can be added to sludges and/or floats to aid in separation.
[0002] The wastewater produced from different kinds of industries normally contains very fine suspended solids, dissolved solids, inorganic and organic particles, metals and other impurities. Due to very small size of the particles and presence of surface charge, the task to bring these particles closer to make heavier mass for settling and filtration becomes challenging.
[0003] Petroleum refining generates large volumes of oily wastewater. With industrial development, there is increase in the amount of oil used. Oil refining, oil storage, transportation and petrochemical industries in the production process generate a lot of oily wastewater.
[0004] Separating sludge increases recycled content, reduces the overall volume of waste generated as well as increases the outlets available for disposal.
Industrial wastewater sludges are often difficult to separate due to relative density of the components as well as particle size and charge distribution. For example, refinery sludge becomes increasingly difficult to process as the inorganic content of the crude slate increases. Various processes throughout refineries increase both the organic content in the form of polymer flocculants and the inorganic content captured by the flocculants.
Industrial wastewater sludges are often difficult to separate due to relative density of the components as well as particle size and charge distribution. For example, refinery sludge becomes increasingly difficult to process as the inorganic content of the crude slate increases. Various processes throughout refineries increase both the organic content in the form of polymer flocculants and the inorganic content captured by the flocculants.
[0005] The low density of particulates in sludge combined with the low density of the accumulated spent flocculants and the increased density of the water component, with high dissolved solids, results in poor separation.
[0006] Various traditional and advanced technologies have been utilized to remove the colloidal particles from wastewater; such as ion exchange, membrane filtration, precipitation, flotation, solvent extraction, adsorption, coagulation, flocculation, biological and electrolytic methods.
[0007] Traditional approaches include the addition of bentonite, lime, ferric compounds, or varying combinations of expensive coagulants and flocculants.
These are often ineffective or require significant dosing rates.
These are often ineffective or require significant dosing rates.
[0008] Petroleum refiners use Dissolved Nitrogen Floatation (DNF) units for clarifying wastewater from a variety of refining processes that include washing from a desalter and other wastewater generated processes within a refinery.
[0009] DNF units force nitrogen under pressure in the form of microscopic bubbles often with a coagulant additive to float particulate matter that has densities near that of water to the top of the unit where they are skimmed off.
Solids that are higher in density sink to the bottom where they are collected separately. The middle phase which is absent of solids is sent to wastewater treatment for processing before discharge.
Solids that are higher in density sink to the bottom where they are collected separately. The middle phase which is absent of solids is sent to wastewater treatment for processing before discharge.
[0010] The DNF bottom sludge and top float are often combined for further treatment. According to one aspect the present invention relates to processing of the combined DNF sludge and float.
11 - 3 - PCT/US2017/048333 [0011] Coagulation is the destabilization of colloidal particles brought about by the addition of a chemical reagent known as a coagulant. Flocculation is the agglomeration of destabilized particles into microfloc, and later into bulky floccules which can be settled called floc.
[0012] Coagulation is the process by which colloidal particles and very fine solid suspensions initially present in a wastewater stream are combined into larger agglomerates that can be separated by means of sedimentation, flocculation, filtration, centrifugation, or other separatory methods. This involves a chemical process in which destabilization of non-settleable particles is realized.
These non-settleable particles can include most colloids as well as extremely small solid particles and all solvated (dissolved) particles. These particles form clumps with the help of a coagulant. Coagulation is commonly achieved by adding different types of chemicals (coagulants) to a wastewater stream to promote destabilization of any colloid dispersion present and the agglomeration of the individual resultant colloidal particles. Coagulation is the destabilization of these colloids by neutralizing the electrostatic forces that keep them apart.
Cationic coagulants provide positive electrostatic charges to reduce the negative electrostatic charges (zeta potential) of the colloids. As a result, these particles collide to form these larger floc particles.
These non-settleable particles can include most colloids as well as extremely small solid particles and all solvated (dissolved) particles. These particles form clumps with the help of a coagulant. Coagulation is commonly achieved by adding different types of chemicals (coagulants) to a wastewater stream to promote destabilization of any colloid dispersion present and the agglomeration of the individual resultant colloidal particles. Coagulation is the destabilization of these colloids by neutralizing the electrostatic forces that keep them apart.
Cationic coagulants provide positive electrostatic charges to reduce the negative electrostatic charges (zeta potential) of the colloids. As a result, these particles collide to form these larger floc particles.
[0013] Flocculation refers to the coming together of particles by means of a physical or mechanical process resulting in the joining together of large aggregated clumps (or flocs) to form larger masses and eventually to precipitate them from the liquid phase and thereby convert them into the solid phase for further separation. In coagulation, these forces responsible for keeping the particles suspended and dispersed after they contact each other are reduced.
This is usually referred to as collapsing the colloid and/or precipitate formation in the case of solvated particles. Flocculation joins these de-established colloidal dispersions into large aggregates that enter the solid phase.
This is usually referred to as collapsing the colloid and/or precipitate formation in the case of solvated particles. Flocculation joins these de-established colloidal dispersions into large aggregates that enter the solid phase.
[0014] According to the present invention the addition of insoluble mineral colloidal suspensions in DNF sludges and floats is used to destabilize DNF
sludge and/or float wastes for purposes of separation and component recovery.
Further, these materials have improved separation in DNF, Dissolved Air Flotation (DAF), and American Petroleum Institute Separator (API Separator), and tank clean-out sludges.
BRIEF SUMMARY
sludge and/or float wastes for purposes of separation and component recovery.
Further, these materials have improved separation in DNF, Dissolved Air Flotation (DAF), and American Petroleum Institute Separator (API Separator), and tank clean-out sludges.
BRIEF SUMMARY
[0015] According to various features, characteristics and embodiments of the present invention which will become apparent as the description thereof proceeds, the present invention provides a method of separating sludges which comprises:
obtaining an industrial sludge;
adding an insoluble magnesium hydroxide colloidal suspension into the industrial sludge to destabilize the industrial sludge; and separating destabilized components of the industrial sludge.
obtaining an industrial sludge;
adding an insoluble magnesium hydroxide colloidal suspension into the industrial sludge to destabilize the industrial sludge; and separating destabilized components of the industrial sludge.
[0016] The present invention further provides an improvement in processes for physically separating components of a sludge which improvement comprises adding insoluble magnesium hydroxide colloidal suspension into the sludge prior to physically separating components of the sludge.
DETAILED DESCRIPTION OF THE DRAWINGS AND THE PRESENTLY
PREFERRED EMBODIMENTS
DETAILED DESCRIPTION OF THE DRAWINGS AND THE PRESENTLY
PREFERRED EMBODIMENTS
[0017] The present invention relates generally to separating sludges and more particularly to the addition of insoluble magnesium hydroxide colloidal suspensions to DNF, DAF, and API sludges, and other sludge wastes for purposes of separation and component recovery.
[0018] The insoluble colloidal magnesium hydroxide suspension used in the present invention can be obtained from mined sources or formed by precipitation and added as a colloidal suspension to sludges and/or floats. Those familiar with the art will understand the benefits of using these materials to destabilize various types of sludge including DNF, DAF, API, and other sludge and/or float wastes.
[0019] According to one aspect the present invention involves the introduction of magnesium hydroxide to process sludges which acts to inhibit the effect of accumulated spent flocculent and increase the density of new flocculent such that traditional processing equipment can be used to more effectively process sludges.
[0020] The use of magnesium hydroxide allows the introduction and/or formation of stable and pumpable, high concentration suspensions without detrimentally altering pH or significantly increasing total solids content.
The low solubility results in a diffuse solids component with suitable charge that adds density to the floc and allows for easy settling or centrifugation from the water and oil components of the sludges.
The low solubility results in a diffuse solids component with suitable charge that adds density to the floc and allows for easy settling or centrifugation from the water and oil components of the sludges.
[0021] Adding an insoluble colloidal magnesium hydroxide suspension into an industrial sludge according to the present invention causes colloidal particles and very fine solid suspensions initially present in the industrial sludge to combine into larger agglomerates that can be separated by means of sedimentation, flocculation, filtration, centrifugation, or other separatory methods.
[0022] The insoluble colloidal magnesium hydroxide suspensions of the present invention can include mined material suspended in an aqueous solution or precipitated from soluble compounds to yield suspended solids.
[0023] The insoluble colloidal mineral suspensions used in the present invention can have as little of 25% percent solids by weight and up to 65%
percent solids by weight with about 50-60% solids by weight being generally suitable for purposes of the present invention. In an alternative embodiment to adding an insoluble colloidal mineral suspension to a sludge dry solids of finely divided magnesium hydroxide can be added to the sludge and then dispersed.
However this alternative does not afford the ease of addition or certainty of thorough solids distribution.
percent solids by weight with about 50-60% solids by weight being generally suitable for purposes of the present invention. In an alternative embodiment to adding an insoluble colloidal mineral suspension to a sludge dry solids of finely divided magnesium hydroxide can be added to the sludge and then dispersed.
However this alternative does not afford the ease of addition or certainty of thorough solids distribution.
[0024] While the insoluble colloidal magnesium hydroxide suspension used according to the present invention causes colloidal particles and very fine solid suspensions initially present in an industrial sludge to combine into larger agglomerates, it can be understood that the addition of other known coagulants and/or flocculants can also be used to aid and improve agglomeration and clumping for separation purposes
[0025] According to the present invention exemplary sludges include industrial wastewater sludges in general, refinery sludges and in particular sludges from processes such as DNF, DAF, API separators, and tank clean-out sludges.
[0026] For purposes of the present invention conventional flocculants/coagulants can also be used including mineral, natural and synthetic materials as well as those listed above.
Examples
Examples
[0027] The following non-limited Examples are provided to illustrate various features and characteristics of the present invention which are not intended to be specifically limited thereto.
Example 1
Example 1
[0028] In this example DNF sludge and float were transferred from a DNF tank to a smaller tank where a 50-60% solids by weight suspension of magnesium hydroxide was added at 1.75% by volume of the DNF sludge and float. A
coagulant (water soluble cationic polymer) was added at 500 parts per million to aid in separation. The combined mixture was heated from ambient temperature to 170 F. The heated material was then fed to a three phase centrifuge to separate clean water (centrate), oils and solids. The centrate had the characteristic of having less than 1% particulate solids and could be sent back (recovered and recycled) to the DNF or sent on to wastewater treatment. The oil could be recovered (and recycled) and the solids could be disposed of.
Example 2
coagulant (water soluble cationic polymer) was added at 500 parts per million to aid in separation. The combined mixture was heated from ambient temperature to 170 F. The heated material was then fed to a three phase centrifuge to separate clean water (centrate), oils and solids. The centrate had the characteristic of having less than 1% particulate solids and could be sent back (recovered and recycled) to the DNF or sent on to wastewater treatment. The oil could be recovered (and recycled) and the solids could be disposed of.
Example 2
[0029] In this example the same procedure in Examples 1 above was followed except 200 ppm of water soluble anionic was added to the sludge and float. The combined mixture was heated from ambient temperature to 170 F. The heated material was then fed to a three phase centrifuge to separate clean water (centrate), oils and solids. The centrate had the characteristic of having less than 1% particulate solids and could be sent back (recovered and recycled) to the DNF or sent on to wastewater treatment. The oil could be recovered (and recycled) and the solids could be disposed of.
[0030] Although the present invention has been described with reference to particular means, materials and embodiments, from the foregoing description, one skilled in the art can easily ascertain the essential characteristics of the present invention and various changes and modifications can be made to adapt the various uses and characteristics without departing from the spirit and scope of the present invention as described above and set forth in the attached claims.
Claims (15)
1 . A method of separating sludges which comprises:
obtaining an industrial sludge;
adding an insoluble magnesium hydroxide colloidal suspension into the industrial sludge to destabilize the industrial sludge; and separating destabilized components of the industrial sludge.
obtaining an industrial sludge;
adding an insoluble magnesium hydroxide colloidal suspension into the industrial sludge to destabilize the industrial sludge; and separating destabilized components of the industrial sludge.
2. A method of separating sludges according to claim 1, wherein a flocculent and/or coagulant is added to the industrial sludge to aid in the separation of the destabilized components of the industrial sludge.
3. A method of separating sludges according to claim 1, wherein the industrial sludge is a waste water sludge.
4. A method of separating sludges according to claim 1, wherein the industrial sludge is refinery sludge.
5. A method of separating sludges according to claim 1, wherein the industrial sludge is a combined bottom sludge and top float.
6. A method of separating sludges according to claim 1, wherein the insoluble magnesium hydroxide colloidal suspension has a solids percent by weight of at least 25%.
7. A method of separating sludges according to claim 1, wherein the insoluble mineral colloidal suspension has a solids percent of up to 65%.
8. A method of separating sludges according to claim 1, wherein the insoluble mineral colloidal suspension has a solids percent by weight that ranges from 25% to 65%.
9. In a process for physically separating components of a sludge the improvement comprising adding insoluble mineral colloidal suspension into the sludge prior to physically separating components of the sludge.
10. A process for physically separating components of a sludge according to claim 9, wherein the process for physically separating the components of the sludge includes at least one of gas-assisted flotation, gravity separation and centrifugal separation.
11. A process for physically separating components of a sludge according to claim 11, wherein the process for physically separating the components of the sludge comprises one of dissolved nitrogen floatation and dissolved air flotation.
12. A process for physically separating components of a sludge according to claim 9, wherein the process for physically separating the components of the sludge comprises the use of an American Petroleum Institute Separator.
13. A process for physically separating components of a sludge according to claim 9, wherein the insoluble mineral colloidal suspension has a solids percent by weight of at least 25%.
14. A process for physically separating components of a sludge according to claim 9, wherein the insoluble mineral colloidal suspension has a solids percent of up to 65%.
15. A process for physically separating components of a sludge according to claim 9, wherein the insoluble mineral colloidal suspension has a solids percent that ranges from 25% to 65%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201662379014P | 2016-08-24 | 2016-08-24 | |
| US62/379,014 | 2016-08-24 | ||
| PCT/US2017/048333 WO2018039411A1 (en) | 2016-08-24 | 2017-08-24 | Treatment of sludges and flocculants using insoluble magnesium hydroxide colloidal suspensions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3034877A1 true CA3034877A1 (en) | 2018-03-01 |
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ID=61245334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3034877A Pending CA3034877A1 (en) | 2016-08-24 | 2017-08-24 | Treatment of sludges and flocculants using insoluble magnesium hydroxide colloidal suspensions |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA3034877A1 (en) |
| WO (1) | WO2018039411A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI97291C (en) * | 1993-06-17 | 1996-11-25 | Kemira Chemicals Oy | Method for recovering aluminum from a water treatment slurry |
| MXPA03003823A (en) * | 2000-11-02 | 2003-07-11 | Otv Sa | Method and apparatus for treatment of water and wastewater. |
| US20110089109A1 (en) * | 2003-10-17 | 2011-04-21 | Hans David Ulmert | Method for treatment of sludge |
| US9738553B2 (en) * | 2012-03-16 | 2017-08-22 | Aquatech International, Llc | Process for purification of produced water |
| US20130313199A1 (en) * | 2012-05-23 | 2013-11-28 | High Sierra Energy, LP | System and method for treatment of produced waters |
-
2017
- 2017-08-24 CA CA3034877A patent/CA3034877A1/en active Pending
- 2017-08-24 WO PCT/US2017/048333 patent/WO2018039411A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2018039411A1 (en) | 2018-03-01 |
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