Environmental Issues Associated With Asphalt Shingle Recycling Presented at the 3

rd

Asphalt Shingle Recycling Forum Chicago, Illinois

November 1-2, 2007

• • • Jon T. Powell, E.I.

Innovative Waste Consulting Services Gainesville, Florida

• • •

Project Background

Initial involvement to help develop http://www.shinglerecycling.org

Compiled a white paper on behalf of CMRA and EPA that: – Summarized two environmental questions/concerns raised regarding shingle recycling – Collected data from recyclers in the US – Evaluated analytical data • Published • Recycler-supplied – Incorporated input from CMRA, EPA, UNH Will keep updating available analytical data as it is collected

• • • • •

Presentation Outline

Background Overview of Asphalt Shingle Recycling Environmental Questions or Issues – Asbestos – Polycyclic Aromatic Hydrocarbons (PAHs) Conclusions On-going research in Florida

Background

• • • Asphalt shingles are the most common roofing material in North America Great market potential for recycling Approximately 11 million tons of asphalt shingle waste is generated per year – Post manufacture (scrap): 1 million tons – Post consumer (tear-off): 7-9 million tons

Typical Composition of An Asphalt Shingle

Granular/aggregate Waterproofing asphalt Base (fiberglass or organic felt) Component Asphalt cement Felt Mineral granules/aggregate Mineral filler/stabilizer Waterproofing asphalt Back surfacing Organic Felt

30-36%

2-15% 20-38% 8-40% Fiberglass Mat

19-22%

2-15% 20-38% 8-40%

Asphalt Shingle Recycling

• Typical Management

Landfilling Recycling

Asphalt Shingle Recycling

• Markets – – hot mix asphalt (HMA) temporary roads or driveways – – dust control on rural roads cold patch – – aggregate road base new shingles – – Fuel/energy supplement landfill cover – mulch http://useit.umaine.edu/images/maingallery/msc9.jpg

Post-Consumer Asphalt Roofing Shingle Processing Facility

Raw Material

Asphalt shingles is dropped off by roofing contractors.

Horizontal mill for size reduction

Trommel Screen

Overhead magnet used for the “under” and “over” streams

Unders – Used as HMA additive Overs – used as covering and paving material for unpaved roads

Ferrous Metal Excavator Asphalt Shingles Shredder Trommel Screen Overhead Magnet Overhead Magnet Basic Layout of Post-Consumer Asphalt Shingle Processing Facility Ferrous Metal Fine ASR Coarse ASR

Environmental Concerns

ASBESTOS PAHs

Possible Exposure Pathways

PAH leaching?

Release of Asbestos?

PAH emissions?

or or Grinding HMA Pavement, mulch, etc.

Health Impacts

• Asbestos – Lung cancer – Mesothelioma • PAHs – Cataracts, kidney and liver damage – Some PAHs are identified as carcinogenic

Pathways of Possible Exposure at Recycling Operations

Generator Processing Facility (storage, grinding)

Most likely pathways of exposure

Generator

Pathways of Possible Exposure for Recycling Operations

Air Emissions

PAH Asbestos

Air Emissions

Use in HMA Processing Facility (storage, grinding) Direct Use

Water Emissions

PAH

Water Emissions

PAH

Human Contact

PAH

Regulatory pathways of concern

ASBESTOS

Types of Asbestos

• Chrysotile • Amosite • Crocidolite • Tremolite • Actinolite • Anthophyllite

Was Asbestos Widely Used?

Manufacturer Years Manufactured Product

NA Asphalt-asbestos roof felt Barber Asphalt Corporation Carey Manufacturing Company The Celotex Corporation NA

Asphalt-asbestos shingles

, asbestos finish felt, mastic 1906 through 1984 Asphalt roof coating and other miscellaneous materials Fibreboard Corporation 1920 to 1968 Roof paint, roll roofings with asbestos-containing base sheets, caulking compounds, plastic cements, taping and finishing compounds General Aniline and Film Corporation Johns-Manville Corporation Kaylite Company National Gypsum Company Monroe Company Rhone-Poulenc Ag Company United States Gypsum Company NA Roofing asphalt 1891 through 1983 NA 1941 through 1981 NA Early 1930s through 1976

Asphalt-asbestos shingles

, rag-felt shingles, fibrous roof coating, shingle tab cement, roof putty Asbestos surface coating for shingles Roofing and

shingles

Asbestos surface coatings for shingles Adhesives, coatings, sealants, and mastics 1930 through 1977 Paper and felt

Asbestos roof shingles (transite) were fairly common; however, this is not the same thing as asphalt shingles. There were also a lot of other roofing products that used asbestos.

http://www.printedpages.net/ASBESTOS.html

http://cgi.ebay.com/1913-JOHNS-MANVILLE-ASBESTOS-ROOFING-AD-LIKE-SOLID ROCK_W0QQitemZ120168796596QQihZ002QQcategoryZ37831QQssPageNameZ WDVWQQrdZ1QQcmdZViewItem “This roofing is made by crushing solid asbestos rock and compressing the long fibres into a dense, homogeneous felt. Several layers of this rock are then permanently cemented together with nature’s greatest water proofer, Trinidad Lake Asphalt, making a light-weight roofing that is virtually a solid sheet of pliable stone.”

Asphalt Shingle Testing Results for Asbestos

• • Data from processors in Maine, Iowa, Florida, Missouri, Minnesota, and Massachusetts Data available for 27,694 samples collected – 18 detections asbestos content <1% – 408 detections asbestos content >1% – Overall, asbestos detections in 426 samples • Approximately 1.53%

• • • •

Asbestos Summary

Asbestos was used in the manufacture of asphalt shingles and asphalt-containing roofing materials in the late 1800s, continuing through to the 1980s. Asbestos phased out as component of asphalt shingles in the early 1980s.

Data on asbestos content in asphalt shingles is very limited. Service life of an asphalt shingle is around two decades, +/-.

Asbestos Summary

• It is common practice in re-roofing to install new shingles directly on top of old ones. – As such, a load of post-consumer asphalt shingle waste may contain multiple layers of asphalt shingles of varying age.

Asbestos Summary

• Analytical results of over 27,000 asphalt shingle samples indicated that about 1.5% of all samples detected asbestos.

– Many asbestos detections were caused by other materials such as mastic that were attached to the samples. http://cgi.ebay.com/1956-Insul-mastic-Co-Insulation-Catalog-Asbestos_W0QQitemZ330173307503QQihZ014QQcategoryZ4259QQcmdZViewItem

Asbestos Summary

• Despite the interference in the samples from the presence of mastic, the limited number of asbestos detections was consistent with the fact that asbestos was mostly phased out in the 1970s and that the typical reported service life for asphalt shingles is around 15-25 years, although effect of new shingles being installed on old ones may impact detection.

Asbestos Summary

• Obtaining/sourcing uncontaminated material should further reduce incidence of asbestos in samples – Some states restrict where the shingles can come from

PAHs

What are Polycyclic Aromatic Hydrocarbons (PAHs)?

• • • A group of over 100 different chemicals Formed primarily during the incomplete burning of coal, oil and gas EPA identifies 7 PAHs as probable human carcinogens – Benz(a)anthracene, Benzo(a)pyrene, Benzo(b)fluoranthene, Benzo(k)fluoranthene, Chrysene, Dibenzo(a,h)anthracene, Indeno(1,2,3 cd)pyrene

PAH Issues Raised

• • • • Some have raised question of whether PAHs should be a concern when recycled asphalt shingles are: Ground up and used as road base Ground up and used as mulch – Leaching?

– Direct Exposure?

Used in HMA – Air emissions?

• • •

PAH Summary

Asphalt shingles naturally contain PAHs. A leaching study on discarded asphalt shingles indicated that PAHs did not readily leach PAHs. Related studies on virgin roofing asphalt, reclaimed asphalt pavement, and run-off from asphalt pavement indicated PAH concentrations below the laboratory detection limits. – However, since that study some acceptable levels have decreased – Additional data are required to detect these samples at lower concentrations

PAH Summary

• • • • PAHs are emitted during HMA production – Pollution control equipment reduces PAH concentrations The effect of using post-consumer asphalt shingles in HMA on PAHs is unknown The use of post-manufacture asphalt shingles is permitted in some states A study in Texas investigating the issue of PAH emissions in HMA production has not yielded any data to date

PAH Summary

• It is not anticipated that clean, uncontaminated asphalt shingles would cause PAH emissions to be significantly different than virgin asphalt

Recommendations to State Regulators

• You can obtain a copy of our White paper, which provides recommendations for information and demonstrations a facility should make to recycle post-consumer asphalt shingles as part of permitting

Ongoing Research

RISK ASSESSMENT OF THE REUSE AND DISPOSAL OF SEVERAL ASPHALT WASTE MATERIALS

Overview

• • University of Florida Department of Environmental Engineering Sciences – Solid and Hazardous Waste Laboratory Objectives: – Measurement of PAHs using instrumentation with lower detection limits (shingles and RAP) – Risk-based analyses of PAHs and other chemicals

Polycyclic Aromatic Hydrocarbons (PAHs)

Parameter

Acenaphthene Acenaphtylene Anthracene Benz[a]anthracene Benzo[a]pyrene Benzo[b]fluorathene Benzo[ghi]perylene Benzo[k]

FL GCTL (µg/L)

20 10 2100 4 0.2

4 10 4

Parameter

Chrysene Dibenz[a,h]anthracene Fluoranthene Fluorine

FL GCTL (µg/L)

5 7.5

280 280 Indeno[1,2,3-cd]pyrene Napthalene Phenanthrene Pyrene 7.5

6.8

10 210

Leaching Test & Analysis in UF

Sample Collection (RAP & asphalt shingles) Leaching Test (SPLP + TCLP) Analysis leaching solution PAH Analysis Heavy metals and other analyses

Acknowledgments

• • • CMRA and EPA UNH Facilities that provided data

Thank You

I

Jon Powell, E.I.

Innovative Waste Consulting Services 6628 NW 9 th Blvd, Suite 3 Gainesville, Florida 32605 352-331-4828 Extension 4 [email protected]

http://www.iwcs.biz