On-line Sorting Technology for CCA-Treated Wood

On-line Sorting Technology for CCA-Treated Wood

Funding Received from

Sarasota Countythrough the

Florida Department of Environmental ProtectionInnovative Recycling Grants Program

Objective

Construct and Operate an On-Line System for Sorting Treated From Untreated Wood

Background Research conducted found CCA-treated

wood in C&D waste piles

6% in 1996 (12 C&D facilities) 9 to 30% in 1999 (3 C&D facilities)

Background

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.619

80

1982

1984

1986

1988

1990

1992

1994

1996

1998

billi

on c

ubic

feet

Untreated

Treated

(From SFPA)

U.S. Statistics for Southern Pine Production

Conceptual Design10’

7’ 3’ 4’ 16’

C o ntro lRo o mC lo se d

InWo o d

Pile

C o nve yo rDe te c to r

30’

7’

3’4’2’

14’

5’ 18’40’

Inp ut Wo o dSto ra g e

PileTre a te d

Pile

Untre a te dPile

De te c to rC o nve yo rWo o d Inp ut

Untre a te d Wo o d

C o ntro l Ro o mWind o w

30’

Conceptual Design (con’d)In le t C o nve yo r

Detector

Wo o d Sa m p le

Exit C o nve yo r

To Untre a te d Pile

Initia lly Se p a ra tio n He re WillBe Do ne M a nua lly

A b uzze r will so und o r a lig ht will shine whe nC C A is d e te c te d

Tasks Task 1: Obtain Permit and Construct Shelter Task 2: Design and Construct Conveyor Task 3: Lab Test and Develop Detector

(Laser, LIBS vs X-ray, XRF) Task 4: Install and Field Test Conveyor and

Detector Task 5: Operate Sorting System and Document

Performance

Overall Timeline

Description 2000 2001

M A M J J A S O N D J F M A M J J A S

Task 1: Obtain Permit and ConstructShelter

X

Task 2: Design and Construct Conveyor X

Task 3: Lab Test & Develop Detector X X

Task 4: Install and Field Test Conveyorand Detector

X

Task 5: Operate Sorting System andDocument Performance

X

Submit Environ. Certification and Scopeof Services

X

Progress Reports X X X X

Final Report X

Task 1:Obtain Permit and Construct

Shelter

Outline

Specifications and location of shelter Construction process

Shelter construction contractors Project management

Project schedule

Shelter Description

Metal fabricated building 30 by 40 feet, 15 foot eave height Portal frame with open sides, 1:12 sloped

roof Engineered concrete slab

Approximate Size and Roof Line

Portal Frame

Open Sides and Height

Site Layout

Parking

Office Trailer

Shelter

Bin

Wood In

Wood Out

Proposed Parking

Machine Shop

C&D Materials Processing Area

C&D Material Storage Bins

Entrance

Shelter Location

Construction Process Metal fabricator - shelter design County engineer - concrete design

Slab Anchor bolts

Electric - separate subcontractor

Anchor Bolt Detail

Available Electric

Shelter Contractor Quotes Uni-Built, Tampa, FL Dura-Steel, Vernon, FL Trident, Sarasota, FL Ranged $9,000 - $17,000

Project Management Review plans and permit documents Coordinate inspection schedule of

foundations, structural steel and electrical system

Review work in-place prior to scheduled inspection by Building Department

Prepare written summary of field inspections

Review and Concrete/Electrical

Design

Building ContractorDevelops Design

Drawing

2 Wk

2 Wk

5 Wks

Permit Review

1 Wk PO/Contract Finalized

6 Wks

Fabrication and Delivery

Concrete Slab

Erect BuildingInstall ElectricSchedule and Timeline

July

28

August

4 21

September

1 15

3 Wks

October

1 12 27

Task 2:Design and Construct Conveyor

Conveyor (Task 2)

Preliminary Quotes American Conveyor, Miami, FL ** Powerscreen, Lakeland, FL

Conveyor (Task 2)

Ta b le Ro lle r C o nve yo r Be lt C o nve yo r Inc line dBe lt C o nve yo r

Ro ll-o ff

12 ’

305’ 10’ 15’3’

O

XRF De te c to r

La se rC o nve yo r, 5’ wid e

Most Recent Design

Conveyor (Task 2)

5’

10 ’

15 ’5’

10’

30’

40’Inc om ing

Wo o d

C C A-Tre a te dWo o d

Inclin

e Co

nvey

or

O the r Wo o dTyp e s

Ro ll-o ff

Contr

ol Ro

om

Task 3:Lab Test and Develop Detector

LIBS vs XRF

Funds will be used for LIBS Research with XRF will continue if

equipment “borrowing” arrangement can be made

Laser-induced Breakdown Spectroscopy (LIBS)

Pulsedlaser

Laser-inducedplasma

Atomicemissioncollection

Spectrometer Detector

Wavelength (nm)

Inte

nsity

205 210 215 220 225 230 235 240 245

Cd

Cd

Cd

Be

Line intensity providesspecies concentration

Line position providesspecies identification

Fiberoptic

LIBS Spectrum of CCA-treated Wood

0

2000

4000

6000

8000

10000

12000

14000

410 415 420 425 430 435 440

Em

issi

on In

tens

ity

Wavelength (nm)

Calcium(422.67)

Chromium425.54427.48428.97

Weathered

LIBS-based Sorting

0

10

20

30

40

50

60

0 1 2 3 4 5 6 7

LIB

S C

hrom

ium

Sig

nal

Wood Sample

CCA-treated Wood

Untreated Wood

Sample Configuration of LIBS Probe

Spectrometer/Detector

Collection Optics Assembly

Plasma

Nd:YAGLaser To Laptop

Computer

WoodSample

Field-deployable Laser: Big Sky Laser

Compact Spectrometer: Ocean Optics

On-line Sorting Technologies

Custom LIBS Commercial XRF(Asoma)

Custom XRF

Cost $36K $20 to $30K $100K

Detection As, Cr, Cu As, Cr, Cu As, Cr, Cu

Analysis time 3 ms @ 10 Hz 50 to 100 s 100 to 500 ms

Spatial resolution(1 ft/sec)

Point1.25" samples

Start/stop mode Continuous2.5" to 12" samples

Standoff distance(Detector-to-wood)

Variable10-12" window

FixedNear contact

~FixedClose proximity

Other issues Laser beam X-ray source X-ray source

Maintenance $400 flashlamp~35 weeks

- - X-ray tube

XRF

ASOMA ----> Now Spectro Contact Harold Soisson Model 400

XRF Co XRF ----> Distributors of EDAX

Contact Steve Cox Model, CT-2000

Note: As detection limit 5 mg/kg

Questions?

More information at:http://www.eng.miami.edu/~hmsolo/

sarasota/index_sara.htm

Link from: www.ccaresearch.org