Generation, Use, Disposal, and Management Options for CCA Treated Wood

Minutes of Technical Advisory Group Meeting Held June 6, 1997





Agneda for TAG Meeting

1. Introduction of TAG members
2. Research Plans and Timelines, University of Miami Helena Solo-Gabriele
        -University of Florida Timothy Townsend
3. Research Conducted
        -AWPI Statistics, Wood Treater Questionnaire Helena, Solo-Gabriele
        -Background Metals Concentrations, Jennifer Penha
        -Field Trip, Thabet Tolaymat
C&D Landfill Studies Timothy Townsend
4. Open Discussion
5. Adjourn

Present:

Lee Casey, Chief of Environ. Compliance, Dade County, Dept. of Solid Waste Mgt.

Kenneth Cogan, Technical Representative, Hickson Corporation

Keith Drescher, Environmental Specialist, Florida Power and Light

G. Michael Hollingsworth, Comptroller, Varn Wood Products

Jennifer Penha, Graduate Student, U.Miami, Dept. of Civil/Environ. Engrg.

Michael Provenza, Environmental Health and Safety Manager, Robbins Manufacturing

Lisa Rawlins, Florida Center for Solid and Hazardous Waste Management

John Schert, Executive Director, Fl. Center for Solid & Haz. Waste Mgt.

Chih-Shin Shieh, Director, Fl. Inst. of Tech. Research Center for Waste Utilization

Helena Solo-Gabriele, Assistant Prof., U.Miami, Dept. of Civil/Environ. Engrg.

August Staats, Manager of Environmental Services, Osmose Wood Preserving Division

David Stephenson, Southeastern Regional Biomass Energy Program, TVA

Donald Surrency, Manager of Plant and Sales, Koppers Industries, Inc.

Thabet Tolaymat, Graduate Student, U. Florida, Dept. of Environ. Engineering Sci.

Timothy Townsend, Assistant Prof., U. Florida, Dept. of Environ. Engineering Sci.

____________________________________________________________________________

The meeting began at 1:10 pm and ended at 3:00 pm. The following items were presented.

1. Welcome to the University of Florida

Dr. Warren Viessman, Associate Dean of the University of Florida welcomed the committee members to the University of Florida.

2. Florida Center for Solid and Hazardous Waste Management

Mr. John Schert described the research agenda for the Florida Center for Solid and Hazardous Waste Management. He distributed a copy of the Center's bulletin and a pamphlet summarizing the 1997 research projects. He described how the Center identifies areas of needed research and he requested that committee members submit their research ideas on the 1997 Research Needs Survey form.

3. Research Plans

Dr. Helena Solo-Gabriele presented a summary of the research plans for the project. She first introduced the topic by briefly describing the purpose of CCA treatment, national statistics on quantities of CCA treated wood produced, geographic distributions of wood preserving plants, and a description of wood deterioration zones. She briefly mentioned federal and Florida regulations which address the disposal of CCA-treated wood. Following the introduction she described the objectives of the research project which were to: a) quantify the amount of CCA treated wood disposed in Florida over time, and b) develop a management plan for discarded CCA treated wood in Florida. Disposal figures will be based a mass balance approach which will require production estimates for CCA treated wood. Production will be determined by compiling available information from the American Wood Preserver's Institute and the Southern Forest Products Association. This information will be supplemented with data obtained from a questionnaire sent to wood preserving plants in Florida and southern Georgia, Mississippi, and Alabama. Disposal reservoirs will focus on CCA treated wood disposed in construction and demolition (C&D) landfills and at wood burning facilities. C&D figures will be determined from wood waste composition studies. Data for wood burning facilities will be obtained from a questionnaire sent to facilities located throughout the state and from data on file at the Department of Environmental Protection. The management plan will include a summary of background metals concentrations in treated and untreated wood and its ash, available options for reuse and recycling, and regulations developed for other states. Research needs for next year were described. These needs included: a) an experimental study which determines the chemical conditions needed for the release of metals from the wood or its ash and b) the development of a field sorting device which can be used to distinguish treated from untreated wood at wood recycling facilities. The anticipated benefits of the study were summarized and the presentation was then open to questions.

Questions:

Mr. Kenneth Cogan asked for elaboration on the wood recycling process which extracts CCA from treated wood.

Mr. Mike Provenza asked for an explanation of our "100 mile radius assumption" for identifying the amount of product sold within the State.

Mr. Keith Dresher mentioned that a majority of the utility poles decommisioned by Florida Power and Light are recycled. He suggested that our mass balance should also focus on the quantities reused.

4. Field Trip

Mr. Thabet Tolaymat described the activities during the "information-gathering" field trip taken by Dr. Helena Solo-Gabriele, Ms. Jennifer Penha, and himself during June 2nd through June 5th 1997. This field trip was part of a three week student exchange between the University of Florida and the University of Miami. During his slide presentation, Mr. Tolaymat described observations noted at visits to the Okeelanta and Ridge cogeneration facilities, the Kimmens recycling operation, and Koppers wood preserving plant.

Questions

Clarification was requested concerning the wood to tire fuel ratio at the Ridge cogeneration facility.

5. Background Metals Concentrations in Treated and Untreated Wood and Wood Ash

Ms. Jennifer Penha presented the results of her literature review investigating background metals concentrations in treated and untreated wood and ash. Her conclusions were that:

CCA treated wood contains higher quantities of arsenic, chromium, and copper than other wood types. CCA treated wood ash exceeds the TCLP standard for arsenic and exceeds standards for disposal through land application.

Other wood types including those treated with creosote and pentachlorophenol meet the TCLP metals and elemental standards for unburned and burned samples when concentrations of arsenic, chromium, and copper are considered.

For wood mixtures, sorting does appear to lower concentrations of arsenic, chromium, and copper in the elemental and TCLP metal analyses.

Questions

Mr. Ken Cogan asked for clarification of the 41 mg/kg regulation for arsenic.
 

Break (10 minutes)
 

6. Construction and Demolition Landfills

Dr. Timothy Townsend reviewed the current state of C&D management in the state of Florida. During his presentation he emphasized practices in handling wood waste including CCA treated wood. He mentioned that most of the C&D waste in northern Florida is disposed in unlined C&D landfills while in southern Florida much of the C&D waste is processed at material recycling facilities (MRFs). At these recycling facilities wood is separated from the rest of the waste stream through mechanical and manual processes. Concerns have been raised regarding the high concentration of arsenic in residual screened material from such facilities.

Questions

Mr. Ken Cogan asked if chromium was also analyzed in the residual screened material and whether the chemical stochiometry of the metals supported that CCA was the ultimate source of the arsenic in the coarse fraction.

7. Amount Generated and Disposed.

Dr. Helena Solo-Gabriele presented national statistics for CCA treated wood including cubic feet of wood product and pounds of CCA utilized in 1995. She used these statistics to estimate the respective quantities for the State of Florida. She presented the disposal projections as documented by Cooper in 1993. These projections show that the quantities of CCA treated wood within the disposal stream will increase between 300 to 500% by the year 2010. The current research project intends to conduct a similar study to project quantities disposed within Florida.

8. Discussion

Mr. Drescher mentioned that quantites of utility telephone poles recycled can be significant.

Mr. Lee Casey described the characteristics of the muncipal solid waste stream.

Dr. Shieh discussed the characteristics of wastes that can be expected at incineration facilities.

Dr. Helena Solo-Gabriele mentioned that the researchers are currently developing a proposal in response to the request-for-proposals distributed by the Southeastern Regional Biomass Energy Program. The proposal is for the development of a sourcebook which will summarize management alternatives for discarded treated wood products and regulations that impact disposal.

Mr. Kenneth Cogan requested written documentation for the current project. The project proposal is included on the world wide web at: http://www.eng.ufl.edu/centers/fcshwm. The direct address to this particular project is: http://www.eng.ufl.edu/centers/fcshwm/cca97.html

Mr. Michael Provenza offered to provide the research team a tour of the Robbins Manufacturing facility in Tampa.
 
 

The next meeting date was set for Friday, October 24rth in Tampa, Florida.