Neighborhood Scale Monitoring and Source Attribution of Air Toxics during BEE-TEX 2014 by Eduardo...

8/12/2019 Neighborhood Scale Monitoring and Source Attribution of Air Toxics during BEE-TEX 2014 by Eduardo (Jay) Olague

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Neighborhood Scale Monitoring andSource Attribution of Air Toxics

during BEE-TEX 2014

Eduardo (Jay) Olaguer, Ph.D.

Program Director, Air Quality Science

Houston Advanced Research Center


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BEE-TEX Field Study

The Benzene and other ToxicsExposure (BEE-TEX) Study is a fieldstudy of human exposure to andsource attribution of the air toxics:benzene, toluene, ethyl benzene andxylenes (BTEX), plus other HAPs (e.g.,

formaldehyde, 1,3-butadiene).

The study will be conducted in theHouston Ship Channel neighborhoodsof Manchester, Galena Park, andMilby Park in the spring of 2014.

The study costs about $1 million andis funded by the U.S. Fish & Wildlife,Coastal Impact Assistance Program(CIAP) through Harris County, Texas.


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BEE-TEX Methodologies

Computer-Aided Tomography (CAT) scans

based on Differential Optical Absorption

Spectroscopy (DOAS) remote sensing.

Real-time mobile monitoring.

Portable cultured human lung cells.

HARC micro-scale 3D Eulerian chemicaltransport model for source attribution and

CAT plume reconstruction.


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Long Path DOAS

Measures total amount ofsubstance over a longpath using visible or UVlight absorption.

BTEX spectra below 290nm, so cannot usesunlight. Must useartificial light source.

Maximum path length

obtained using bi-staticconfiguration (no retro-reflectors) with LED lightsources opposite detector.

4.1 km 5.08 km

5.15 km

70m

300m

130m

20m

Moody

Tower

LP-DOAS

Downtown

Houston


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Computer-Aided Tomography

CAT-DOAS withmultiple light paths

can be used to

derive spatiallyresolved ambient

concentrations (not

just path averages)over an entire

neighborhood.


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AERODYNE MOBILE LABORATORY

Real-time measurement capabilities:CO, CO2, O3, HCHO, VOCs, NOx, PM

Wind speed & direction, temperature, humidity

SCIPUFF DISPERSION MODELComplex wind flows

Forward mode

Inverse mode (AIMS)


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Cultured Lung Cells

UNC will deploy in vitro technique for one

week during the BEE-TEX campaign.

Living lung cells will be exposed to polluted air

delivered across an air-liquid interface.

Cell toxicity & inflammation measured based

on releases of specific proteins and enzymes.

Cell responses may indicate exposure to

specific classes of pollutants (e.g., aldehydes).


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HARC Air Quality Model

Neighborhood scale 3D dispersion model with itsown chemical mechanism (47 gas phase reactions).

Very high temporal (~20 s) and horizontal (~200 m)

resolution. (Note: SIP models for Houston have at

best 4 km horizontal resolution.)

Model can infer emissions from observed ambientconcentrations (inverse mode) as well as to predict

concentrations from emissions (forward mode).


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Modeling for BEE-TEX

HARC model will be used to optimize CAT

reconstructions for HAPS.

Inverse modeling will also be performed based

on CAT and Aerodyne mobile lab data.

QUIC model with NGA 3D building database

will enhance model source attribution.


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Computational Fluid Dynamics

QUIC model used to simulate wind based on 3D LIDAR building morphology.


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Formaldehyde Source Attribution

for a Texas Refinery

Winds from QUIC model

HARC model with chemistry (200

m, 20 s resolution) run in inverse

mode based on mobile lab

measurements

Emissions attributed primarily to

fluidized cat cracking and

desulfurization operations

HCHO results agree with I-DOAS

emission flux measurements for

target upwind sources (18 kg/hr)

Olaguer, et al. (2013),J. Geophys. Res.-Atmos., 118, 11,317

11,326.


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BEE-TEX Web Portal

General information available at:

http://maps.harc.edu/beetex/About.aspx.

Graphic display of emission inventory at:

http://maps.harc.edu/beetex/.
http://maps.harc.edu/beetex/About.aspxhttp://maps.harc.edu/beetex/http://maps.harc.edu/beetex/http://maps.harc.edu/beetex/About.aspx


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Conclusion

BEE-TEX will test new monitoring and modelingtechniques that potentially yield more detailedand accurate information on ambient exposure to

and source attribution of air toxics. BEE-TEX will benefit industry, regulators, and

fence line communities by providing better toolsfor LDAR, permitting, and emissions reporting.

HARC is willing to work collaboratively with allstakeholders to ensure the quality and success ofthe BEE-TEX campaign.

Neighborhood Scale Monitoring and Source Attribution of Air Toxics during BEE-TEX 2014 by Eduardo...

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