The present invention discloses apparatus and methods for separating waste residual from a Materials Recovery Facility into multiple recyclable and currently conventionally classified as non-recyclable fractions; accounting for the weight distribution of each fraction and reporting such data to stakeholders.
For purposes of this application a generalized overview of the Municipal Solid Waste, MSW, collection and trash processing steps as practiced in the U. S is given. A materials recovery facility, materials reclamation facility, materials recycling facility or Multi re-use facility, all designated MRF, is a specialized plant that collects, separates and prepares Municipal Solid Waste, MSW, materials for one of three options, recycling, composting or land fill. In the process the MRF creates its own waste stream, termed “yield loss” or residuals or waste residual, may be more than 15% by weight of the material the MRF takes in. In 2017 the National Waste & Recycling Association, NWRA, named FCC Environmental Services' MRF located in Dallas, Tex. the best recycling facility in the U.S. In 2015 FCC signed a contract with the city of Dallas to achieve the following goals for waste diversion, comprising recycling and waste to energy, from 40% by 2020 and up to 80%, termed “zero waste”, by 2040. The residual not diverted must be landfilled. Eliminating the landfill problem is the primary focus of the instant invention.
Trash collection in environmentally conscious cities in the United States has evolved into a three-bin system. One bin for Composting, defined as anything that has been grown, including paper, food waste and cotton or wood and yard trimmings. One bin for landfill, defined as non-recyclables, and one bin for recyclables. The instant invention discloses apparatus and methods for separating waste residual from a MRF into multiple recyclable and currently conventionally classified as non-recyclable fractions; accounting for the weight distribution of each fraction and reporting such data to stakeholders. For purposes of the instant invention the current definition of one municipality, Palo Alto, Calif., for setting the current practice of compost, recycle and non-recycle, thus landfill, is used.
The present invention discloses a system to collect, sort, and account for a portion of material placed in a customer recycle bin via a single stream curbside collection program for residents and commercial facilities. This invention extends U.S. Pat. No. 8,813,972 and discloses novel methods for processing and tracking recyclables and items currently not considered to be recyclable. The term “non-recyclable” is a moving target based upon the location, local customs and cost of “recycling” various items versus cost of land filling those items. The method disclosed herein relies on a relationship between one or more primary MRFs, serving a community or region, and a “secondary MRF™” that accepts residual waste streams rejected by the primary MRF. The goal of all municipalities in the U.S. is to approach “zero waste”; Palo Alto notes this in
Herein are disclosed techniques and methods, implemented by a “secondary MRF™” comprising a novel data collection system beneficial to brand owners and municipal administrators seeking to improve recycling performance. U.S. Pat. No. 8,813,972 outlines the design of a “secondary MRF™” and how a “secondary MRF™” targets and separates refuse material-by-material or group-by-group. Currently the material not recycled by a primary MRF is dependent on several factors which may have nothing to do with an item's material content. The MRFs installed equipment for separating waste streams by content and size are determining factors given the manner in which the local waste stream is collected; three segregation bins are obviously a first step in trash separation; single bin collection virtually prevents trash separation based solely on cost.
U.S. Pat. No. 7,188,73 and U.S. Pat. No. 8,813,972 disclose processing steps to categorize and sort by size and material type materials rejected by a primary MRF. The size targeted is any material from 14 inch to 6 inches; should the material be discarded paper or film the size may be up to 16 inches. The type of material, termed waste residual, is all the material the primary MRF chooses not to sort by material type plus material the MRF may have designated for landfill.
Currently, as noted in U.S. Pat. No. 8,813,972, the Big 7 are identified as cardboard and paper, mixed waste paper, glass, aluminum, PET, HDPE and tin. When a the primary MRF sends material outside the Big 7 that they cannot economically sort by material type to a secondary MRF™; the Secondary MRF will sort the stream, removing all valuable materials, identifying what materials are still going to landfill and generate a report on recovery for that entire recycle bin base. This report gives a city an ongoing report card on what is being recycled that is placed in the recycle bin and more important what is not. In addition, given that the secondary MRF is local, all material not recycled by material type is sent to a responsible end use and disposed responsibly; this step eliminates the risk of pollution via third world exports of mixed plastics. As the secondary MRF opens markets for every items sorted the cities can continue to shift material from the landfill or black bin to the recycle bin improving overall diversion and adding valuable resources to the economy.
In some embodiments a secondary MRF, on a quarterly basis, defines brands by material type and generates a report on the cost to recycle either by brand or by material type. A secondary MRF™ reports these numbers for the households and/or commercial recycle bin customers represented by primary MRFs. These reports are also available for purchase by interested brand owners who have a stake in having their package recycled. These reports help steer the entire recycle bin collection and sorting system as innovative packages are developed and used in the future.
As noted the primary MRF is sorting by material type into the Big 7 to maximize its recycle value. Given the diverse size and type of material placed in the recycle bin significant cross contamination exists. For example, a primary MRF produces a bale of mixed waste paper with significant cross “contamination”, including water bottles, plastics and film, trash, light aluminum etc. The instant invention provides a method to improve the value of the recycle product by reducing “contamination”.
Adjustment of air flow velocity may be accomplished by a variable speed drive (VSD) modulating the frequency, Hertz, for each blower motor. An operator may adjust the system using VSD to optimize the number or type of light materials removed via “negative air”, the upward flow source above the screen. This is an important aspect of the invention; an operator may desire to remove light plastics such as 6 oz. bottles through the air system versus through the optical sorter to not only reduce demand on the optical sorters but also reduce the complexity of the stream into an optical sorter. In some embodiments a VSD has a range for the positive air, below the screen, of 10 Hz to 50 Hz. and a range for “negative air” may be from 25 Hz to 90 Hz. Exemplary pneumatic separators are offered by Twin City Fan and Blower Co. In some embodiments a positive air blower, blowing in an upward motion, of size 182 BAF, Arr 9, Class 1 Complete with access door, flanged outlet, inlet screen, belt guard, shaft and bearing guard, V-Belt drive, and a 5 HP, 1800 RPM, 460-3-60 TEFC Motor is used. In some embodiments a “negative” air blower, exhausting in an upward motion, from Twin City Fan and Blower Co. is a size 915 RBW, Arr. 9, Class 22, CW BHD, complete with access door, flanged outlet, inlet screen, belt guards, shaft and bearing guard, V-belt drive and a 40 HP, 460-3-60 TEFC, VDF Motor; rating 9,500 CFM, 15″ SP, 2,036 RPM, 18.72 BHP.
The transition from the vibratory screen to the air separation is accomplished for all materials regardless of size using the art defined by the author in U.S. Pat. No. 7,188,730. The difference is scaling of the transition chute, screens, and blowers. In the original art the material was typically under 2.5 inches in size and the screen width no more than 48 inches in size. In this application the material is less than 12 inches in size and the screen width may be 60 to 72 inches in width. By creating the air chute the same length as the vibratory screen you get flawless separation.
The sequence for sorting material as noted in
The (secondary MRF's)™ role in the system it to sort the lower volume material that is received from the primary MRF. Packaging materials and types are constantly changing; innovation into new packages can occur without placing an undue burden on the primary MRF's sorting systems.
In
The pass thru fraction is fraction 4 and that goes to a machine that separates resin #2 from resin #3. At step 209 resin #3 is separated from fraction 7; resins 1 and 2 and all paper have been removed at steps 207B. At 209 resin #4, fraction 9, is removed and now in 212 resin #5 is removed; alternatively aseptic containers and/or cable top cartons are removed in 211. Now, 213 now removes resins #6 and 7 from fraction 10; Newly added 215 finishes the separating and performs various auditing functions for feedback to the stake holders. One of the resins removed will correspond to plastic #3, PVC; after this plastic is separated out any of the remaining plastics and/or paper types may be sent to a waste-for-fuel operator should that be an optimum end use.
Means for separating and/or sorting materials, including recyclables and non-recyclables and the means for sorting and/or separating recyclables from non-recyclables within a residual waste stream comprise one or more screens of given size opening, one or more air separators with a drop box for sorting lighter items for heavier, manual sorting, visual camera detection systems, optical, as in radiation, camera detection systems, including X-ray, UV, Infrared and near infrared, combined with a robotic or mechanical system to selectively separate what the detection systems categorizes using images, pictures, artificial intelligence, bar codes, tracer elements, scales for weighing, size or other easily measured parameters associated with a given material type. These machines are manufactured by Pellenc SA, Tomra Systems ASA, Redwave Solutions US LLC, Max AI®, AMP Robotics, Alchemy Systems Ltd., Starlinger recoStar.
Means for identifying one or more responsible entities associated with one or more material types of the separated non-recyclables comprise communicating with local and regional officials charged with recycling on a regular basis, such as quarterly or annually; communicating regularly with primary MRFs and package manufactures
Means for aggregating the quantity, material type and responsible entity data comprise computerized logging, optical recognition and weighing systems as integral components of the robotic systems or stand-alone systems aided by manual labor or not. In some embodiments a “predetermined composition” is defined based on a 20 pound test lot and visual inspection on every load from a primary MRF; in addition, every quarter 10 tons per MRF are processed through the Secondary MRF™ system to confirm pricing and what's available for recovery; this information is collected as part of the aggregating quantity, material type and responsible entity data.
In some embodiments A secondary separation and tracking system for processing residual waste streams from one or more primary MRF's comprises a means for separating recyclables from non-recyclables within a residual waste stream; a means for separating the recyclables by one or more parameters such that the separated recyclables have commercial value; a means for separating the non-recyclables by one or more parameters such that at least a portion of the separated non-recyclables have commercial value; a means for identifying one or more responsible entities associated with one or more material types of the separated non-recyclables; and a means for aggregating the quantity, material type and responsible entity data such that the data can be communicated to the responsible entity for purposes of reducing the non-recyclable quantity.
In some embodiments a first fraction of material of predetermined composition derived by processing a residual stream from a primary MRF wherein the residual stream is processed through at least one shaker screen comprising openings greater than 2±1.0 inches in a lateral dimension wherein a second fraction with a dimension less than 2±1.0 inches is removed and the processed residual stream is processed through at least one air separation module operating such that a third fraction comprising material with a apparent density less than 0.1 and a lateral dimension greater than the screen openings is transported up and away from the processed residual stream using at least one negative pressure air separation wherein the processed residual stream is processed through at least one optical sorting system wherein a fourth fraction is removed such that the composition of the first fraction, after removal of the second, third and fourth fractions, is between about 90% and 98% by weight of material chosen from a group consisting of plastics with #'s from 1 through 7, ferrous metal, non-ferrous metal, cardboard and paper, mixed waste paper, glass, aluminum, PET bottles, HDPE bottles and tin. The predetermined composition consists of one or more these materials based on maximizing the economic value of the first fraction. Maximizing the economic value of a fraction sorted from a residual stream from a MRF depends on supply and demand, cost of sorting to a given, predetermined composition, market price of a given, predetermined composition and being able to achieve a minimum quantity to be of interest to a buyer. Predetermined compositions may range from season to season with geographical distributions as well. Additional sub-categories exist with the groups mentioned above; for example, glass may be sorted by color; paper may be sorted by color and density as in news print versus cardboard; plastic #3, PVC, may be segregated from other plastics; paper and plastic may be combined for a waste-to-fuel operator; other exemplary predetermined compositions are known to those knowledgeable in art. In some embodiments a “predetermined composition” is defined based on a 20 pound test sample and visual inspection on every load from a primary MRF; in addition every quarter 10 tons per MRF is processed through the Secondary MRF™ system to confirm pricing and what's available for recovery; this information is collected as part of the aggregating quantity, material type and responsible entity data.
In some embodiments a method for separation and tracking residual waste streams from one or more primary MRF's comprises the steps; separating recyclables from non-recyclables within a residual waste stream; separating the recyclables by one or more parameters, comprising weight, size, density, composition and/or functionality, such that the separated recyclables have a uniform material type of at least 90%; separating the non-recyclables by one or more parameters, comprising weight, size, density, composition and/or functionality, such that at least a portion of the separated non-recyclables have a uniform material type of at least 90%; identifying one or more responsible entities associated with one or more material types of the separated non-recyclables; and aggregating the quantity, material type and responsible entity data such that the data can be communicated to the responsible entity for purposes of reducing the non-recyclable quantity. For purposes herein a “uniform material type and a “predetermined composition” are meant to be the same; they both describe a composition of residual waste that has commercial value either for recycling or for waste-to-energy conversion.
In some embodiments a first fraction of material of predetermined composition derived by processing a residual stream from a primary MRF wherein the residual stream is processed through at least one shaker screen comprising openings greater than 2±1.0 inches in a lateral dimension wherein a second fraction with a dimension less than 2±1.0 inches is removed and the processed residual stream is processed through at least one air separation module operating such that a third fraction comprising material with a apparent density less than 0.1 and a lateral dimension greater than the screen openings is transported up and away from the processed residual stream using at least one negative pressure air separation wherein the processed residual stream is processed through at least one optical sorting system wherein a fourth fraction is removed such that the composition of the first fraction, after removal of the second, third and fourth fractions, is between about 90% and 98% by weight chosen from a group consisting of plastics with #'s from 1 through 7, ferrous metal, non-ferrous metal, cardboard and paper, mixed waste paper, glass, aluminum, PET, HDPE and tin. Optionally, the first fraction consists of a composition greater than about 95% by weight consisting of one or more plastics whose number is from 1 to 7; optionally, plastic #3, PVC, is removed from the first fraction. In some embodiments the fifth fraction of material of predetermined composition derived by processing the second fraction wherein the second fraction is processed through at least one air separation module operating such that a sixth fraction comprising material with a apparent density less than 0.1 and a lateral dimension less than the screen openings is transported up and away from the processed second fraction using at least one negative pressure air separation such that the composition of the fifth fraction after removal of the sixth fraction is between about 90% and 98% by weight of plastics with #'s from 1 through 7, ferrous metal, non-ferrous metal, cardboard and paper, mixed waste paper, glass, aluminum, PET bottles, HDPE bottles and tin. Optionally the fifth fraction consists of a composition greater than about 95% by weight consisting of one or more plastics whose number is from 1 to 7; optionally, plastic #3, PVC, is removed from the fifth fraction.
In some embodiments a first fraction of material of predetermined composition is derived by processing a residual stream from a primary MRF wherein the residual stream is processed through at least one shaker screen comprising openings less than 2±1.0 inches in a lateral dimension wherein a second fraction with a dimension less than 2±1.0 inches is removed and the processed residual stream is processed through at least one air separation module operating such that a third fraction comprising material with an apparent density less than 0.1 and a lateral dimension greater than the screen openings is transported up and away from the first fraction using at least one negative pressure air separation such that the composition of the first stream after removal of the first and second fractions is between about 90% and 98% by weight of plastics with #'s from 1 through 7, ferrous metal, non-ferrous metal, cardboard and paper, mixed waste paper, glass, aluminum, PET, HDPE and tin. Optionally, the first fraction consists of a composition greater than about 95% by weight consisting of one or more plastics whose number is from 1 to 7.
In some embodiments a method for separation and tracking residual waste streams from one or more primary MRF's comprises the steps; separating recyclables from non-recyclables within a residual waste stream; separating the recyclables by one or more parameters, comprising weight, size, density, composition and/or functionality, such that the separated recyclables have a uniform material type of at least 90%; separating the non-recyclables by one or more parameters, comprising weight, size, density, composition and/or functionality, such that at least a portion of the separated non-recyclables have a uniform material type of at least 90%; identifying one or more responsible entities associated with one or more material types of the separated non-recyclables; and aggregating the quantity, material type and responsible entity data such that the data can be communicated to the responsible entity for purposes of reducing the non-recyclable quantity.
U.S. Pat. Nos. 7,188,730 and 8,813,972 are incorporated herein in their entirety by reference.