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Air Quality Dispersion Modelling to Evaluate CIPP Installation Styrene Emissions.

Elizabeth Matthews¹, John Kraft¹, Gazi Hossain¹

¹Trenchless Technology Center, College of Engineering and Science, Louisiana Tech University, Ruston, LA 71272, USA.

International Journal of Environmental Research and Public Health

|November 11, 2022

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Steam-cured cured-in-place pipe (CIPP) styrene emissions dissipate quickly. This study found styrene concentrations unlikely to cause lasting health impacts beyond the recommended 4.6-meter safety perimeter.

Area of Science:

Environmental Engineering
Occupational Health
Chemical Engineering

Background:

Cured-in-place pipe (CIPP) is a common trenchless pipe repair method.
Steam-curing of styrene-based resins in CIPP can release airborne chemicals, notably styrene.
Concerns over styrene emissions necessitate further investigation into CIPP site safety.

Purpose of the Study:

To model worst-case styrene emissions from steam-cured CIPP installations.
To assess styrene concentrations relative to health and safety thresholds.
To evaluate the adequacy of current safety perimeters for CIPP sites.

Main Methods:

Utilized AERMOD dispersion modeling software.
Modeled styrene emissions from two US CIPP installation sites.

Keywords:

AERMOD CIPP resin pipeline rehabilitation public safety styrene trenchless technology

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Calibrated the model using work-day average emissions, not instantaneous measurements.

Main Results:

Styrene emissions from stacks dissipate rapidly.
Concentrations exceeded safety thresholds only within 2 meters of the stack.
Predicted concentrations align with previously measured field data.

Conclusions:

Significant health impacts are unlikely beyond the recommended 4.6-meter safety perimeter.
The study validates the importance of adhering to current safety guidelines for steam-cured CIPP.
Effective emission control and safety perimeters are crucial for CIPP operations.