Environmental Evaluation of VOC Emissions in CIPP Rehabilitation: Comparative Analysis of Resin Types and Curing Techniques

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Abstract
Aging underground pipeline infrastructure across the USA has outlived its design lifespan, highlighting the need to replace or rehabilitate it to ensure continued service to communities. Among trenchless methods, Cured-in-place pipe (CIPP) was chosen to re-pair the damaged pipe since it minimizes surface disruption and is ideal for use in densely populated areas. However, environmental concerns have been raised regarding the chemical compounds involved in the CIPP process. The study focuses on evaluating volatile organic compounds (VOCs) that could be emitted from CIPP liners during the in-stallation and curing process. The results were compared with exposure limits of USEPA, NIOSH, and OSHA to assess potential occupational and worker health impacts. The data were collected from six different sites across the USA and documented VOCs before, dur-ing, and after the installation and curing process. Various devices were used to capture air emissions, including PIDs, Summa canisters, and worker samples. The findings indicated that high styrene concentrations were present within the CIPP work zone. The results also confirmed a considerable reduction in VOC concentrations within five feet down-wind of the work zone. In summary, the results suggest that public health risks appear to be low. However, there are possible health implications for personnel directly engaged in CIPP activities.

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