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VOC removal at low contaminant concentrations using granular activated carbon
D W VanOsdell1, M K Owen, L B Jaffe
1Center for Engineering and Environmental Technology, Research Triangle Institute, Research Triangle Park, NC, USA. dwv@rti.org
Journal of the Air & Waste Management Association (1995)
|September 1, 1996
Summary
Granular activated carbon (GAC) effectively removes volatile organic compounds (VOCs). High-concentration tests can predict GAC performance at lower, indoor-relevant concentrations, aiding air purification strategies.
Area of Science:
- Environmental Science
- Chemical Engineering
- Materials Science
Background:
- Volatile organic compounds (VOCs) pose indoor air quality concerns.
- Granular activated carbon (GAC) is a common adsorbent for air purification.
- Predicting GAC performance at low concentrations is crucial for effective design.
Purpose of the Study:
- To evaluate the performance of small-scale GAC beds for VOC removal.
- To correlate GAC performance from high-concentration tests to low-concentration scenarios.
- To assess the applicability of accelerated testing for indoor air quality applications.
Main Methods:
- Testing GAC beds (2.54 cm thick) with VOCs at 0.5–100 ppm.
- Maintaining a constant residence time of 0.11 s.
- Conducting tests at 25°C and 50% relative humidity.
Main Results:
- Measured 10% breakthrough times varied from 0.5 to several hundred hours.
- Logarithmic relationship between breakthrough time and concentration was approximately linear for individual compounds.
- GAC performance in high-concentration tests showed favorable comparison to models and published data.
Conclusions:
- High-concentration breakthrough tests can be cautiously extrapolated to predict GAC performance at indoor VOC levels.
- Accelerated testing offers a viable method for estimating GAC efficacy in real-world indoor environments.
- Further research can refine extrapolation models for diverse VOC mixtures and conditions.