On-line Sorting Technologies for CCA Treated Wood

Sarasota Team MeetingFebruary 27, 2001

Objective

To design and implement an automated system to effectively sort CCA-treated wood from other wood types at C&D facilities

Project Tasks

Task 1: Construct Shelter

Task 2: Construct Conveyor

Task 3: Lab Test and Develop Detector

Task 4: Install and Field Test Conveyor & Detector

Task 5: Operate Sorting System and Document Performance

Description 2000 2001

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

Task 1: Construct Shelter X

Task 2 Construct Conveyor X

Task 3: Develop Detector X X

Task 4: Install/Test X

Task 5: Operate X

Environ. Cert. & Scope X

Progress Reports X X X X

Final Report X

SHELTER

Outline

• Participants and Schedule

• Construction process

• Completion of shelter

Participants

• Metal shelter design, fabrication and assembly – Trident

• Concrete slab design – Sarasota County

• Concrete form – Meyer and Gabbert

• Concrete pour, anchor bolts and project management – Anderson and Ellis

• Electrical – Claxton Electric

Pull permit, construct concrete

form, electrical

Permit Review by BDAnd Zoning

6 Wks

1.5 Wks

1 Wk

Pour concrete and allow for curing

Permit application completed and submitted to building department (BD)

Delivery and assembly of

shelter

Schedule and Timeline

October

18 25

November

9 16 30

December

8 18 30

2+ WksPull permit,

construct concrete form

Permit Review by BDAnd Zoning

6 Wks

3 Wks

1 Wk

Pour concrete and allow for curing

Permit application completed and submitted to building department (BD)

Delivery and assembly of

shelterSchedule and Timeline

October

18 25

November

9 16 30

December

8 21 27 29

3 days

January 2001

5 8

Electrical conduits installed

***Control room and final electrical wiring installed on January 23, 2001

Construction Process

• Concrete form

• Electrical Conduit Installation

• Concrete Pour

• Shelter Assembly

• Electric Wiring Installation

Concrete form completed December 21, 2000

Electrical conduit installed December 27, 2000

Concrete PourDecember 29, 2000

Shelter Assembly01-06-01

Electrical wiring installation1-23-01

Control Room Completion

• Interior control room built with recycled materials (from on-site) by Meyer and Gabbert

• Control room will be finished by carpenter– Outside painted (off-white or taupe available)– Roofed (shingles available?)– Recycled wood paneling on interior– Door knob– Shelves– Cleaned

CONVEYOR

Conveyor

Conveyor Manufacturer

American Conveyor

CCA-TREATED

WOOD

INCLINE CONVEYOR

OT

HE

R W

OO

DT

YP

ES

RO

L L- OF

F

30’2.5’

4.5’2.5’10’10’26’

5’

10.5’ Horizontal Guideto Align Wood

1’

Electric Panel for Conveyor

ROLLERCONVEYOR

BELTCONVEYOR

40’

North

IncomingMixed Wood

SPUR CONVEYOR

7’

Roof SupportColumn

10’45o

4’

Shear Arm

Conveyor Layout: February 6, 2001

ControlRoom

Conveyor – Cross Section

Ta b le Ro lle r C o nve yo r Be lt C o nve yo rInc line d

Be 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

Conveyor Design

Table

Holding arm

X-ray

Wood

Cross-Sectional View

X-rays

Detector mounting

Alignment Arm

Wood Piece

Conveyor Surface

DETECTOR

Laser-Induced Breakdown Spectroscopy (LIBS)

Pulsedlaser

Laser-inducedplasma

Atomicemissioncollection

Spectrometer Detector

Wavelength (nm)In

tens

ity205 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

issio

n I

nte

nsity

Wavelength (nm)

Calcium(422.67)

Chromium425.54427.48428.97

Weathered

LIBS-based sorting of CCA-treated wood

0

10

20

30

40

50

60

0 1 2 3 4 5 6 7

LIB

S C

hro

miu

m S

ign

al

Wood Sample

CCA-treated Wood

Untreated Wood

LIBS detector: Tasks and status

• Acquire laser and spectrometer components

• Interface spectrometer to the computer for data acquisition with external triggering

• Optical configuration design and design of detector package

• Construct prototype detector system

• Synchronize spectrometer data acquisition with firing of laser

• Construct timing delay circuit

Optical configuration: Lens design

laserbeam

laserbeam

longer, lessintense focus

shorter, moreintense focus

Optical configuration: Lens design

Sampleanalysisregime

Laserbeam

Beamexpander

Optical configuration: Lens design

0

2

4

6

8

10

12

14

16

100 150 200 250 300 350 400

Inte

nsit

y (

mJ

/mm2 )

Distance from Lens (mm)

x2

x1

~6"Analysis Region

Spectrometer-computer interface

Plasma emission

Fiberoptic

Laptop computer

Spectrometer

Ext. trigger from laserData acquisition

and analysis

Instrument synchronization

Time0-16 us

Laser pulse (10 ns)

Plasma emission (25 us)

Chromium emission (10 us)

Detector

Questions?

www.eng.miami.edu/~hmsolo/sarasota/index_sara.htm