Operat Operational Methyl Bromide Rec Recapture Systems Gary F. - - PowerPoint PPT Presentation

▶

Jan 29, 2024 132 likes •336 views

Operat Operational Methyl Bromide Rec Recapture Systems Gary F. Kn . Knapp GFK Cons nsulting Summary Emission R Reduction Mass Emitted Maximum Concentration Without Recapture 19.6 lbs Without Recapture 16,000 ppm With Recapture

SLIDE 1

Operat Methyl Bromide Rec

Gary F. Kn GFK Cons

Operational Recapture Systems

. Knapp nsulting

SLIDE 2

Summary – Emission R

Mass Emitted

Without Recapture 19.6 lbs With Recapture 4.2 lbs

=79% Reduction

Reduction

Maximum Concentration

Without Recapture 16,000 ppm With Recapture 500 ppm

=97% Reduction

SLIDE 3

Estimated Emissions

Assumptions:

40 ft. container with 40,000 lbs

commodity

5,000 cubic feet fumigated space
MeBr concentration of 4 lb/1000

cubic feet

20 lbs methyl bromide applied

3.2 C

Tota

15.4 1.0 0.4 Commodity Leakage Bypass Adsorber

tal Emission 4.2 lbs over 3-4 hours

SLIDE 4

D/FW International Peri Treatment Center

D/FW International Perishable Treatment Center

Perishable

Recapture system - right view Recapture system - left view

SLIDE 5

Fu Fumigation chambers and Great Lakes Recapture System

Well-Pict Strawberries

Fumigation chambers

es Watsonville, CA

SLIDE 6

Well-Pict Strawberries

Carbon a containin activated

es Watsonville, CA

Recapture system showing carbon canister, blower, and exhaust stack adsorber canister ing 2,500 lb. ed carbon

SLIDE 7

Methyl Bromide Recapture System

George Bush Internation

Treatment and Inspection building e

tional Airport, Houston

SLIDE 8

System Schematic

MB Fumigation Chamber Adsorber Desor Ther Destru Bromine Production MB Production Air with MB Air with C HBr Br2 MB Make-up carbon as needed

rber

ermal truction ith <500 ppm MB Carbon with 10% MB MB Located at fumigation facility Located at carbon regeneration site

SLIDE 9

Recapture System Deve

Conducted under a Cooperative Agreement with USDA-ARS and

Lab and Pilot Work at ARS Lab in Fresno, CA with Dr. James Leesch

evelopment

ive Research and Development nd GFK Consulting, 1995-99

Mobile unit built by Tigg Engnieering and tested at fumigation facilities on the East and West Coasts

SLIDE 10

Fumigation Procedure

 Container is in place and co  Introduce fumigant into tarp

concentration

 At the end of the fumigation

begin recovery ventilation

 When concentration reache

500 ppm) as indicated by d ventilation

 When concentration reache

and remove tarp and comm covered with tarp arped space, monitor tion period, open the tarp and ches target concentration (250- y detectors, switch to bypass ches 5 ppm, cease ventilation modity

SLIDE 11

Concentration Profiles

20 40 60 80 0.1 1 10 100 1000 10000 100000 MeBr Concentration, ppm Time, Minutes

Note log scale Fumigation period Begin Aeration

16,000 ppm ~5 ppm from fumigation bay ~1 ppm fro adsorber e

Switc at 500

100 120 140 160 180

Enclosure

Enclosure Stack

from r exhaust

itch to bypass 500 ppm Terminate aeration at 5 ppm

SLIDE 12

Typical Fumigation - Assu

40 ft. container with 40,000
5,000 cubic feet fumigated
MeBr concentration of 4 lb
20 lbs methyl bromide app

Assumptions

000 lbs commodity ated space 4 lb/1000 cubic feet applied

SLIDE 13

Fumigation - Initiation

20 lbs MeBr

SLIDE 14

Estimated Emissions -

Leakage through tarp – 1.0 lbs (5%) estimated Absorbed onto commodity and packaging – 4 lbs estimated

Fumigation

SLIDE 15

Estimated Emissions - (R

14.4 lbs to

Aeration

(Recapture)

to adsorber

SLIDE 16

Estimated Emissions -

3.0 lbs to

Aeration (Bypass)

to bypass

SLIDE 17

Material Balance

0.4 pounds 4.2 pounds 15.4 pounds

SLIDE 18