Transcript Document

Targeted Monitoring, Outreach,
and Education:
Traditional Brick Kilns,
San Luis Rio Colorado, Sonora
James R. Anderson, PhD
Environmental Fluid Dynamics Program
Arizona State University
Funding from BECC (2007) and USEPA
(2006)
In collaboration with:
Arizona Dept. of Environmental Quality
and
Regional Center for Border Health, Inc.
Outline:
1. Review of monitoring results from 2006 study.
2. New results on lead emissions from kilns.
3. Plans for 2007 indoor monitoring, education, and
outreach.
Background
1. Approx. 130 brick kiln sites in the urban area of
San Luis Rio Colorado, Sonora, concentrated
within three small colonias ladrilleras.
2. Brick-makers’ families live at the brick-making
sites.
3. Some of the local schools are either near to or
surrounded by brick kiln sites.
Active burning stage – about 1 day, black smoke dominated by soot, fine soil dust, and
“brown carbon”. Smoldering phase another 2 days.
Plume tends to stay close to surface for significant distances.
Fuels – anything that burns, but wood and
particle board are favored because of brick
quality that results.
1. Particle board scrap (with plastic facing)
2. Unpainted wood
3. Painted wood from demolition of old buildings
(4. Old tires.)
Suumary of Results from 2006 Study
a. PM10 concentrations on the order of 2000 g/m3 or higher
are emitted from kilns near ground level during the active
burning and smoldering phases of brick making in the
colonias. (Highest PM10 was about 4000 g/m3 )
b. During active burning and smoldering, about 70% of the
PM10 measured was present as PM2.5 and therefore easily
respired.
c. During certain periods of sampling, high concentrations of
fine particles with significant lead content were detected,
mostly in the form of lead chloride.
d. Canister samples found elevated concentrations of a number
of organic gases in kiln smoke relative to ambient
background (such as1,2,4-Trimethylbenzene).
Table 1. Samples with Pb-bearing particles (8 of 27 total samples analyzed by automated SEM).
Date
Time
% Number Concentration Ave.diameter
Colonia Mezquite
14-Feb-06 20:42-21:27
0.09
0.39
14-Feb-06 22:12-22:57
0.46
0.37
15-Feb-06 00:27-01:12
1.76
0.34
15-Feb-06 02:42-03:27
1.17
0.40
15-Feb-06 04:12-04:57
7.99
0.44
Colonia La Grullita (school site)
23-Feb-06 00:01-00:46
23-Feb-06 02:16-03:01
23-Feb-06 03:46-04:31
0.08
0.07
1.58
0.38
0.44
0.59
While we did not directly measure the mass loading of Pb, a reasonable estimate from
this data is that in an actively burning plume with 2000-4000 g/m3 PM10 the Pb
content might be on the order of 50-100 g/m3
Current Pb standard in both US and Mexico is a quarterly average of 1.5
g/m3
While this standard may or may not be exceeded in the colonias, what are the
health effects of repeated exposures to high levels of Pb?
2007 project plans with RCBH collaboration:
1. Indoor PM10 monitoring of 2 houses and at school
2. Questionnaire for residents of 2 studied colonias to assess
awareness of health issues, including awareness of Pb
toxicity.
3. Development of outreach materials.
4. Education and outreach activities in 2 colonias.
5. Also, compilation of health and school absentee data from
area around colonias by working with Sec. de Salud Publica
Goals:
1. Document health hazards associated with current brick
making methods.
2. Develop outreach materials that emphasize risks to children's
health from the kiln smoke.
3. Convince brick makers to stop using painted boards as fuel.
4. Contribute to the on-going effort by city and state officials to
reduce the health risks from kiln operations.