Extent of CCA-Treated Wood Used for Commercial Mulch

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Presentation transcript:

Extent of CCA-Treated Wood Used for Commercial Mulch Progress to Date

Current Disposal Pathways Co-mingled C&D Waste C&D MRF Wood With CCA Unlined C&D Landfill Cogeneration Mulch

Recycled Wood Contains CCA 6% in 1996 (12 C&D facilities) 9 to 30% in 1999 (3 C&D facilities) 22% in 2001 (1 C&D facility)

CCA-Treated Wood Difficult to Sort Visually

Mulch: Major Market for Recycled Wood

Recycled Wood Mulch Is Typically Dyed

Uses of Recycled Wood Mulch

Uses of Recycled Mulch

Uses of Recycled Mulch

How to Recognize Recycled Wood Mulch

News Coverage Mini-study by news media Many inquiries from concerned citizens Some samples sent to the research team Some contained CCA and others did not

Leaching Characteristics of Mulch Samples No. No. Exceeding GWCTL for As No. Exceeding GWCTL for Cr C&D Debris 20 18 5 Yard Waste 3 1 Colored Mulch 2 Vegetative Mulch

Objectives Quantify the extent to which mulch in south Florida is contaminated with CCA Determine the adequacy of visual methods in establishing whether or not a mulch sample contains CCA.

Methods Sample collection – Completed ~ 34 samples collected 22 mulches from retail establishments 5 from playgrounds 2 from schools 2 soil/wood blends 3 controls

Methods Sample Preprocessing & Analysis Unburned Sample Ashed Visual Inspect Stain SPLP ICP/AA Analysis “Fraction of CCA” 8 samples ashed to date

Timeline Complete sample collection by Nov’02 “ pre-processing by Jan’03 “ analysis by July’03

Technical Results Study will characterize mulch sold at commercial establishments and mulch in use Leachability  SPLP Fraction of CCA in mulch Visual Characteristics

Questions?

Management and Disposal Options for CCA-Treated Wood Waste Recently Funded Management and Disposal Options for CCA-Treated Wood Waste

Purpose Prioritize feasible management and disposal options for CCA-treated wood

Co-Mingled C&D Waste Unlined C&D Landfill C&D MRF Recycled Wood with CCA Mulch Wood Cogeneration WTE Plant Add’l Sorting Untreated CCA Treated Wood Air Emissions Ash Disposal Re-use or Recycle Volume Reduction- incineration Recycling Disposal in a Lined Landfill Ultimate Disposal Sort at Source

Methods Document current management scenarios for CCA-treated wood in FL Document current quality of FL water, air, and soil. Describe existing disposal facilities. Evaluate environmental impacts of current disposal pathways and alternative scenarios

Questions ?