Open-Cell Foam Environmental Indicator, and Methods of Use

Abstract

A method of removing and detecting the presence of substances from at least one of a body of water and the air. The method includes placing into the body of water or into the air an open-cell foam material, removing separate portions of the open-cell foam material from the water or air at different exposure times after the open-cell foam material was placed into the water or air, and determining the presence in the removed separate portions of one or more substances that were removed from the water or air by the open-cell foam material.

Claims

1. A method of removing and detecting the presence of substances from at least one of a body of water and the air, comprising: placing into the body of water or into the air an open-cell polyurethane foam material; removing separate portions of the open-cell polyurethane foam material from the water or air at different exposure times after the open-cell polyurethane foam material was placed into the water or air; and determining the presence in the removed separate portions of one or more substances that were removed from the water or air by the open-cell polyurethane foam material.

2. The method of claim 1, wherein the open-cell polyurethane foam material comprises a plurality of separate structures selected from the group of structures consisting of strips, strips that are longer than a height of a water column, cubes, and small pieces.

3. The method of claim 2, wherein the separate structures are held in place by one or more of an anchor, a weight, a netting, and a container with openings to allow the flow of water therethrough.

4. The method of claim 1, wherein placing the open-cell polyurethane foam material comprises suspending a plurality of separate structures at different levels through a height of a water column.

5. The method of claim 4, wherein placing the open-cell polyurethane foam material further comprises placing a plurality of separate structures at different locations in the body of water.

6. The method of claim 4, wherein placing the open-cell polyurethane foam material further comprises floating a structure at least partially on the surface of the water.

7. The method of claim 1, wherein placing the open-cell polyurethane foam material into the body of water comprises casting the open-cell polyurethane foam material into the water with a fishing rod.

8. The method of claim 1, wherein placing the open-cell polyurethane foam material into the body of water comprises dragging the open-cell polyurethane foam material behind a boat that moves through the water, or floating the open-cell polyurethane foam material on the surface of the water, or coupling the open-cell polyurethane foam material to a dock, or placing the open-cell polyurethane foam material in a bathtub or sink.

9. The method of claim 1, wherein removing separate portions of the open-cell polyurethane foam material from the water or air at different exposure times after the open-cell polyurethane foam material was placed into the water or air, takes place at more than one time over an exposure time of at least eight hours.

10. The method of claim 9, wherein removing separate portions of the open-cell polyurethane foam material from the water or air at different exposure times after the open-cell polyurethane foam material was placed into the water or air, takes place at more than one time over an exposure time of at least one day.

11. The method of claim 1, wherein the substances are selected from the group of substances consisting of oil, diesel range organics, gasoline range organics, drilling fluids, biocides, glutaraldehyde, metals, organometals, metalloids, volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), pesticides, polychlorinated biphenyls (PCBs), fertilizers, solvents, human waste, pharmaceuticals, radioactive materials, and components thereof.

12. The method of claim 1, wherein the substances comprise volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs).

13. The method of claim 1, wherein the substances comprise a surfactant.

14. The method of claim 1, wherein the substances comprise oils or greases.

15. The method of claim 1, wherein the open-cell foam material comprises a silane-grafted material.

16. The method of claim 1, wherein the open-cell foam material comprises a silane-modified material.

17. A method of removing and/or detecting the presence of substances from water, comprising: placing into the water an open-cell foam material comprising at least about 70% open cells; removing one or more separate portions of the open-cell foam material from the water; and determining the presence in the removed portions of one or more substances that were removed from the water by the open-cell foam material; wherein the open-cell foam material comprises one or more of ethylene methyl acrylate (EMA), ethylene vinyl acetate (EVA), ethylene-ethyl acrylate (EEA), ethylene-butyl acrylate (EBA), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), high density polyethylene (HDPE), polypropylene (PP), natural rubber, ethylene propylene diene monomer (EPDM), synthetic rubber, chlorinated polyethylene (CPE), olefin block copolymers, ethylene maleic anhydride copolymer, singe site initiated polyolefins, metallocene catalyzed polyolefins, silane-modified polymers (including but not limited to silane grafted, silane functionalized, and silane cross-linked polymers), maleic anhydride grafted polymers, styrene-butadiene-styrene copolymers, polyisoprene, and equivalents and blends thereof.

18. A method of removing and detecting the presence of substances from at least one of a body of water and the air, comprising: suspending a plurality of separate structures comprising an open-cell foam polyurethane material in the form of strips, strips that are longer than a height of a water column, cubes, and small pieces, at different levels through a height of a water column of the body of water and at different locations in the body of water; removing separate portions of the structures from the water at different exposure times after the structures were placed into the water; and determining the presence in the removed separate portions of one or more substances that were removed from the water by the structures, wherein the substances are selected from the group of substances consisting of oil, diesel range organics, gasoline range organics, drilling fluids, biocides, glutaraldehyde, metals, organometals, metalloids, volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), surfactants, pesticides, polychlorinated biphenyls (PCBs), fertilizers, solvents, human waste, pharmaceuticals, and components thereof.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0029] The drawing depicts one non-limiting example of the placement of open-cell polyurethane (PU) foam material into a body of water.

DETAILED DESCRIPTION OF EXAMPLES

[0030] Methods of removing and detecting the presence of substances (such as, but not limited to, contaminants) from a body of water or the air are disclosed. As a first step, an open-cell polyurethane foam material (or other foam materials, as described elsewhere herein) can be placed into the body of water or into the air. The placement can be at one or more locations in the body of water or air, and at one or more depths or heights in the body of water or in the air. After desired exposure times, one or more separate portions of the open-cell foam material are removed from the water or air. The presence in the removed separate portions of one or more substances that were removed from the water or air by the open-cell foam material are then determined, typically by standard EPA testing procedures.

[0031] The methods are effective both to determine the presence of substances such as contaminants in the water or air, and also to remove such substances from the water or air. The methods thus can be used for contaminant detection and/or filtration or remediation.

[0032] The drawing depicts three groups of strips or “blades” of open-cell polyurethane foam material 12, 14 and 16. Each group has multiple strips that are held together at about their centers, The groups are fastened to a line 32 that is held on the bottom 24 of water body 20 by weight or anchor 30. In this example group 16 floats on the water surface 22, while groups 12 and 14 are held at different depths below the surface. This disclosure allows for the placement of open-cell foam material at any one or more heights of a body of water and/or the air, and at one or more locations in the body of water or air. Various non-limiting methods of exposing the open-cell material to water or air are described herein; any such method can be used as desired or as necessary depending on the body of water or the air mass, and/or the testing regime that is desired under the circumstances.

[0033] After desired exposure times, one or more separate portions of the foam material are removed from the water or air. This can be done by clipping or cutting a piece of foam, or removing an entire group or other portion or separate piece of foam, for example. The exposure times can be from seconds to minutes to hours to days to weeks to months, depending on the particular testing regime. Since the foam absorbs and adsorbs certain materials (described elsewhere herein), the removed portions of the foam can be tested for particular substances. The foam can act as an accumulator for these substances. Also, the different locations and different exposure times allow for a tailored review of contaminants, their locations and their movement within the water or air.

[0034] The subject materials have been used in extensive testing of various bodies of water, both salt and fresh water, including open bodies of water, rivers, streams and irrigation canals. Open-cell foam material has been shown to remove from water at least the following types of contaminants. Non-limiting examples of each type of contaminant are also listed; these examples illustrate contaminants that are in each type or group, but are not limiting. [0035] Metals and Metalloids: examples include but are not limited to Arsenic, Barium, Boron, Cadmium, Cooper, Lead, Manganese, Mercury, Nickel, Phosphorus, Vanadium, Yttrium. [0036] Volatile Organic Compounds (“VOCs”): examples include but not limited to Tetrachloroethane, Trimethylbenzene, Butanone, Acetone, Benzene, Ethylbenzene, Methylene Chloride, Xylene, Toluene. [0037] Semi Volatile Organic Compounds (“SVOCs”): examples include but not limited to Naphthalene, Anthracene, Chrysene, Fluorene, Hexachlorobenzene, Nitrobenzene, Pyrene, Dimethyl Phthalate. [0038] Drilling/Transportation/biocide fluids: examples include but not limited to Glutaraldehyde, Benzene compounds, Toluene compounds, Xylene compounds. [0039] Coal related fluids: examples include but not limited to MCHM (4-Methylcyclohexanemethanol). [0040] Fluids/Solvents that for example leach from landfills into peoples homes: examples include but not limited to 1,4 Dioxane. [0041] Radioactive materials: examples include but not limited to: Strontium, Uranium, Yttrium, Rhenium.

Test Methods and Results

[0042] Results of water testing using an environmental indicator made from an open-cell foam material of a type disclosed in the US patent that is incorporated by reference herein (e.g., 100% EMA), were set forth in the Appendices of the priority U.S. Provisional Patent Application Ser. No. 62/022,760 filed on Jul. 10, 2014. The entire contents of this Provisional patent application, including the Appendices, are incorporated by reference herein in their entirety. Accordingly, the data disclosed in the Appendices is also incorporated herein by reference. Some of that data is set forth and summarized below.

[0043] The testing methods used by certified third party laboratories include but are not limited to: EPA SW8015B, EPA SW7471A, EPA SW6010B, EPA SW8270C, EPA SW8260B, IH-004, ALS Method 8270 (for MCHM), and EPA 1664 (modified) for oil and grease.

[0044] One test set detected low levels of PCBs in the harbor at New Bedford, Mass. Data was included in the appendices.

[0045] In Knapp Creek, Pa., Oak Glen Nature Preserve, Ohio, Lynchburg, V A and Aliceville, Ala., it was discovered that the cumulative environmental indicator detected and removed organometals, metals, metalloids, VOCs, and SVOCs, including chemicals like 4-methylcyclohexanemethanol (MCHM), which was spilled in Charleston, W. Va., USA. See third party testing results (in the appendix), which illustrates the accumulation over time into the open-cell EMA foamed matrix, mimicking environmental uptake by living organisms. It is of note that arsenic, barium, lead, and mercury were detected in Knapp Creek. There were harsh winter weather conditions and the open-cell EMA retained and absorbed these metals and related compounds.

[0046] Results of uses of the environmental indicator in water are disclosed in the appendices I-V of the priority Provisional application, which are incorporated by reference herein in their entireties. A brief discussion of those appendices follows.

[0047] Appendix I of the priority Provisional application is a table (printed on two pages) that includes a comparison of the environmental indicator to a grab sample taken from the surface of the water (at 8:30 AM when the test began) after a coal ash spill in the Dan river in Eden, N.C. See tables 1A and 1B for the data. The indicators (environmental indicators or “EI”) were in three different forms: one was anchored with strips at the bottom, middle and top of the water column (such as in the drawing), a second was in the form of floating eelgrass, and the third was in the form of a mitt made of the material that was submerged in the water column. These various forms of indicators were removed at three different times to show exposure or accumulation of contaminants over time, and the samples were sent for analysis to a third-party lab. Organometals, metals, metalloids and SVOCs were detected at different times and different heights in the water column. Samples were taken with instantaneous grab samples along with open-cell foam cumulative samples at various exposure times. The grab sample showed non-detects (N/D) for everything with the exception of iron. The open-cell foam cumulative samples at various exposure times detected the presence of metals and SVOCs. Furthermore, the open-cell foam cumulative samples (indicators) illustrated the importance of sampling the entire water column at various depths. For example, the bottom indicator detected the presence of manganese, phosphorus, and titanium while the middle and top indicators showed non-detects. Also, the open-cell foam mitt that was exposed to the water near shore from top to bottom in about 2 feet of water for 3 minutes (right next to where the instantaneous grab sample was taken) detected the presence of iron, manganese, phosphorous, titanium, and SVOCs while the grab sample only detected the presence of iron.

[0048] Appendix II of the priority Provisional application is a table (printed on three pages) that includes results taken after a bakken oil spill in Aliceville, Ala. A variety of forms of the indicator were placed into the water in and around the site of this bakken oil train explosion and a variety of residual SVOCs and VOCs were detected leaching out of the soil and into the wetlands approximately three months after the oil train explosion. Pure oil samples were taken as leaching from the soil and these were used as a baseline to compare to what the indicators absorbed in the nearby surrounding waters from the wetlands.

[0049] Appendix III of the priority Provisional application is a table (printed on one page) that includes results taken from the banks of the James River in Lynchburg, Va. These samples were collected from the river bank of the James River after a bakken oil train exploded. An indicator was placed directly into the contaminated river bank and was then placed into a sealed glass jar and sent to a third-party lab. A variety of SVOCs, VOCs, and organometals, metals, and metalloids were detected that were consistent with prior bakken oil train explosions. Appendices III a of the priority Provisional application (four pages) and III b of the priority Provisional application (four pages) are publicly available results as posted by the James River Association and Arcadis. The James River Association and Arcadis tests showed non-detects which includes but is not limited to the following metals and oil compounds while the environmental indicators detected these metals and oil compounds: barium, chromium, nickel, phosphorus, vanadium, acetone, tri-methylbenzene, xylene and napthalene.

[0050] Appendix IV of the priority Provisional application is a table (printed on two pages) that includes results from various open-cell foam cumulative samples were taken from the water column after an oil spill in Galveston, Tex. See Table 4 for the data. Eelgrass indicators and submerged indicators were placed into the water. Of four samples taken (3 surface (two with eelgrass and one with an environmental indicator) and 1 middle of water column), the middle indicator detected chromium, cobalt, and lead were detected but not detected in the others. Also, vanadium was detected on the surface eelgrass after exposure of approximately 43 hours but had a non-detect after 20 hours. Vanadium was detected by the middle indicator in the middle of the water column after 20 hours (again there was a non-detect on the surface after 20 hours).

[0051] Appendix V of the priority Provisional application is a table (printed on one page) that includes results taken from three locations in Nantucket harbor, Nantucket, Mass. Environmental indicators were placed in the entire water column and retrieved at different lengths of time to monitor exposure over time. When retrieved, the indicators were placed in plastic and glass sealed containers for third party lab testing. At the boat dock, acetone was detected in the middle of the water column but not at the top or bottom. At the town pier, vanadium was detected at the bottom of the water column but not at the middle of the water column.

[0052] Various open-cell foam cumulative samples were taken in the Cawelo water district in Kern County, Calif. where wastewater from oil drilling and/or refining operations is filtered and diluted with fresh water and then feed to a canal system that is used to irrigate crops. Baseline oil-water as it comes out of the ground was tested along with downstream water throughout the canal system. See tables 2A-2D for data (blank cells in the tables are non-detects). TPH stands for total petroleum hydrocarbons, baseline oil is the subject oil that is leaking or spilling in its raw form, irr pond is an irrigation pond, Poso Creek was baseline oil-water coming right out of the ground in its raw state. The post-filtration dilution locations were various locations throughout the irrigation canal system in the Cawelo Water District of Kern County, Calif., USA. The presence of oil and VOCs were found downstream that matched the chemicals found in the baseline oil-water mixture. Also, there were various non-detects throughout the canal system which confirmed that the water is not in equilibrium and the importance of multiple sample points with the ability to detect chemicals over time/exposure.

[0053] Separately from the irrigation water in the Cawelo water district and in another part of Kern County, various open-cell foam cumulative samples were taken from the surface of oil wastewater discharge points in unlined pits. The data gathered (presented in Table 3) illustrates that even in this relatively confined water discharge system that there is no equilibrium of contaminants in water. All samples were exposed to the surface water for 30 minutes. Metals, metalloids, and VOCs showed various detects and non-detects (blank table cells), along with variation in concentration levels.

[0054] The fact that testing with the subject material has had non-detects and detects for chemicals of concern in the same bodies of water is not only expected but is absolute proof that chemicals/contamination are not in equilibrium in water. Thus, using an accumulator as described herein is highly beneficial for determining actual contaminants in water.

TABLE-US-00001 TABLE 1A Exposure Time Instan- taneous- 3 Hours/ 3 Minutes 1 Second 9 Hours Surface 3 Hours Sample Grab El Float Mitt Sample El Bot Kayak El Mid Units Units Units Units Units Metals (ppm) (ppm) (ppm) (ppm) (ppm) Iron 830 0.81 480 220 110 Manganese 11 N/D N/D 33 N/D Phosphorus 17 N/D 13 13 N/D Titanium 47 N/D 17 N/D N/D Units Units Units Units Units SVOC's (ppb) (ppb) (ppb) (ppb) (ppb) Bis(2-ethylhexl) 640 N/D 2200 270 230 phthalate Di-n-octyl N/D N/D 340 N/D 720 phthalate

TABLE-US-00002 TABLE 1B Exposure Time 3 Hours 3 Hours 6.5 Hours 6.5 Hours 6.5 Hours Sample El Top El Bot El Top El Mid El Bot Units Units Units Units Units Metals (ppm) (ppm) (ppm) (ppm) (ppm) Iron 110 210 120  220 310 Manganese N/D N/D N/D N/D 5.4 Phosphorus N/D N/D N/D N/D 15 Titanium N/D N/D N/D N/D 12 Units Units Units Units Units SVOC's (ppb) (ppb) (ppb) (ppb) (ppb) Bis(2-ethylhexl) 210 120 810 1500 430 phthalate Di-n-octyl 270 550 550 N/D N/D phtalate

TABLE-US-00003 TABLE 2A Exposure Time Instant Instant 17 Hours 17 Hours Location Poso Poso Post Post Creek Creek Dilution/ Dilution/ Oil Oil Water Water Field Field Treatment Treatment Sample Baseline Baseline Canal Canal Oil w Mitt Oil w/El Top El Bottom El Oil PPM PPM PPM PPM TPH C20-C34 240000 480000 940  340 VOC's PPB PPB PPB PPB Acetone 440 530 57 1,2,4- 400 160 Trimethlybenzene 1,3,5- 110 52 Trimethlybenzene m,p-Xylene 120 66 o-Xylene 70 Methylene Chloride 89 82 26

TABLE-US-00004 TABLE 2B Exposure Time 30 Minutes 30 Minutes 5 Hours 5 Hours Location Post Post Post Post Dilution/ Dilution/ Dilution/ Dilution/ Water Water Water Water Treatment Treatment Treatment Treatment Sample Irr Pond Unlined Canal Canal Eelgrass Pond El Top El Bottom El Oil PPM PPM PPM PPM TPH C20-C34 1300 180 270  130 VOC's PPB PPB PPB PPB Acetone 79 1,2,4- Trimethlybenzene 1,3,5- Trimethlybenzene m,p-Xylene o-Xylene Methylene Chloride  32 31  30

TABLE-US-00005 TABLE 2C Exposure Time 7 Months 30 Minutes 30 Minutes Location Post Dilution/ Post Dilution/ Post Dilution/ Water Water Water Treatment Treatment Treatment Sample Canal Top Canal Top Canal Middle Indicator A Indicator Indicator Oil PPM PPM PPM TPH C20-C34 230 VOC's PPB PPB PPB Acetone 1,2,4- Trimethlybenzene 1,3,5- Trimethlybenzene m,p-Xylene o-Xylene Methylene Chloride 56 44

TABLE-US-00006 TABLE 2D Exposure Time 30 Minutes 44 Hours Location Post Dilution/ Post Dilution/ Water Treatment Water Treatment Sample Canal Bottom Indicator Canal Eelgrass Oil PPM PPM TPH C20-C34 VOC's PPB PPB Acetone 1,2,4- Trimethlybenzene 1,3,5- Trimethlybenzene m,p-Xylene o-Xylene Methylene Chloride 48 26

TABLE-US-00007 TABLE 3 Exposure Time 30 Minutes 30 Minutes 30 Minutes Location Kern County Kern County Kern County Sample Eelgrass A Indicator Eelgrass B PPM PPM PPM Oil TPH C10-C20 320 650 9100 TPH C20-C34 670 1900 27000 Metals Barium 11 10 Boron 31 42 14 Copper 25 Iron 220 Phosphorous 12 Sodium 2000 3000 VOC's PPB PPB PPB Acetone 250 560 90 1,2,4- 65 46 240 Trimethlybenzene 1,3,5- 69 Trimethlybenzene 2-Butanone 36 75 Benzene 76 360 31 Carbon Disulfide 31 m,p-Xylene 130 180 330 n-Butylbenzene o-Xylene 64 97 170 Ethylbenzene 36 63 120 Methylene Chloride 27 Isopropylbenzene 30 Napthalene 40 N-Propylbenzene 58 Toluene 200 600 240

TABLE-US-00008 TABLE 4 Exposure Time 20 Hours 19 Hours 19 Hours 19 Hours Sample Eelgrass Eelgrass Indicator Indicator/ Surface Surface Surface/Top Middle Metals PPM PPM PPM PPM Aluminum 16 221 76.4 226 Barium 1.57 5.29 2.31 2.97 Calcium 4960 4640 3580 4600 Chromium N/D N/D N/D 0.594 Cobalt N/D N/D N/D 0.641 Lead N/D N/D N/D 0.69 Magnesium 886 1100 943 1140 Manganese 4.39 49.8 17 49.8 Molybdenum 0.514 N/D N/D 0.725 Iron 54.3 0.677 248 857 Sodium 4330 5160 5070 5300 Tin 3.27 4.53 2.53 N/D Titanium 0.493 4.67 1.66 4.07 Vanadium N/D 0.776 N/D 0.757 Zinc 55.1 35.4 27.5 33.4

[0055] Results of water testing using an environmental indicator made from an open-cell polyurethane foam material compared to results testing the same water using a polyolefin foam material of a type disclosed in U.S. Pat. No. 8,853,289 are set forth in tables 5 and 6, below. In table 5, one inch cubes of the two materials were used, and in table 7, strips of the two materials were used. In each case, the volume of contaminated water (water contaminated with bakken oil), the volume of the material, and the exposure times, were the same. The level of contaminants (semi-volatile organic compounds (SVOCs) and (volatile organic compounds (VOCs) detected are expressed in parts per billion (ppb).

TABLE-US-00009 TABLE 5 1″ cube Open-Cell 1″ cube Polyurethane Polyolefin Absorption (PU) Foam (PO) Foam Ratio Contaminant (PPB) PPB PPB PU/PO SVOCs 1-Methylnaphthalene 120,000 43,000 2.79 2-Methylnaphthalene 130,000 46,000 2.83 Phenanthrene 17,000 Not detected VOCs 1,2,4 Trimethylbenzene 190,000 78,000 2.44 1,3,5 Trimethylbenzene 39,000 15,000 2.60 Benzene 7,000 Not detected Ethylbenzene 50,000 15,000 3.33 Isopropylbenzene 30,000 11,000 2.73 m,p Xylene 140,000 47,000 2.98 Naphthalene 43,000 12,000 3.58 n-Butylbenzene 28,000 9,900 2.83 n-Propylbenzene 36,000 13,000 2.77 o-Xylene 84,000 31,000 2.71 p-Isopropyltoluene 22,000 8,500 2.59 sec-Butylbenzene 17,000 6,300 2.70 Toluene 64,000 13,000 4.92

TABLE-US-00010 TABLE 6 Open-Cell Open-Cell Polyurethane Polyolefin strips strips Absorption Contaminant (PPB) PPB PPB Ratio PU/PO SVOC's 1-Methylnaphthalene 47,000 15,000 3.13 2-Methylnaphthalene 50,000 15,000 3.33 Naphthalene 15,000 Not detected Phenanthrene 9,100 Not detected VOC's 1,2,4 65,000 10,000 6.50 Trimethylbenzene 1,3,5 14,000 2,100 6.67 Trimethylbenzene Ethylbenzene 19,000 3,000 6.33 Isopropylbenzene 10,000 1,700 5.88 m, p Xylene 59,000 9,500 6.21 Naphthalene 11,000 1,400 7.86 n-Butylbenzene 6,800 860 7.91 n-Propylbenzene 12,000 1,800 6.67 o-Xylene 35,000 6,400 5.47 p-Isopropyltoluene 7,600 990 7.68 Toluene 26,000 3,900 6.67

[0056] As can be seen the polyurethane foam exhibits remarkably better performance of detected species (anywhere from 2.44 to 7.91 times better than the PO foam), and also detects some species that are not detected by the polyolefin foam.

[0057] Additional comparison testing (efficacy of PU vs. PO) was conducted of an industrial wastewater contaminated with oil and grease. See table 7, below, for results. As before, strips were used. The volume of water, the volume of strips, and the exposure times were the same for both materials. In this case, the reduction of oil and grease was measured, which equates to removal of organic contaminants from (i.e., remediation) of water contaminated with oil or grease.

TABLE-US-00011 TABLE 7 Oil & Grease % Oil & Grease Oil & Grease/Effluent Testing (PPM) Removed Baseline Effluent 660 — PU Strips 190 71% PO Strips 360 45%

[0058] As can be seen, the PU removed 71% of the oil and grease, which is a 58% improvement over the removal by the PO strips.

[0059] Another comparison test was conducted that equates to removal of surfactants from water. The PU foam and the PO foam were tested with wastewater effluent containing 19,000 ppm of Methylene Blue Active Substances (MBAS). EPA method E 425.1 was used to test the effluent water before exposure to PU and PO foam, and again after exposure. The PU Foam reduced the MBAS by 27% while the PO Foam did not reduce the MBAS.

[0060] The testing methods used by certified third party laboratories for the above testing, include but are not limited to: EPA SW8015B, EPA SW7471A, EPA SW6010B, EPA SW8270C, EPA SW8260B, IH-004, ALS Method 8270 (for MCHM), and EPA 1664 (modified) for oil and grease.

[0061] A number of implementations have been described. Nevertheless, it will be understood that additional modifications may be made without departing from the scope of the inventive concepts described herein, and, accordingly, other embodiments are within the scope of the following claims.