Treatment of wet process hardboard plant VOC emissions by a pilot scale biological system |
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| Institution: | 1. College of Environment Science and Engineering, Hunan University, Changsha 410082, P.R. China;2. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, P.R. China;3. Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, South China University of Technology, Guangzhou 510006, P.R. China;1. National Engineering Laboratory for VOCs Pollution Control Material & Technology, Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing 101408, China;2. College of Environmental Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;1. College of Environment and Energy, South China University of Technology, University Town, Guangzhou 510006, PR China;2. Shanghai Environmental Monitoring Center, Shanghai 200235, PR China;3. School of International Development, University of East Anglia, Norwich NR4 7TJ, UK;4. Shenzhen Academy of Environmental Science, Shenzhen 51800, PR China |
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| Abstract: | A pilot scale biological treatment system for air emissions was installed and tested at a forest products plant in western Oregon, USA, which collected and treated gaseous emissions from the hardboard steam press vents on the top of the plant building. This system was installed mainly to demonstrate the effectiveness of biological treatment technologies in removing volatile organic compounds (VOC) and hazardous air pollutants (HAP) from the wet-process hardboard press emissions, and to test the efficiency of the system on fine particles and condensable organics with the presence of a pre-treatment wet dust collector. The bio-oxidation system was comprised of a particle pre-treatment unit Type W Rotoclone (wet hydrocyclone), a biotrickling filter and a biofilter with airflow capacity of up to 4.72 m3/s. This unit operated at approximately 0.71 m3/s, which is the optimal flow required for the Rotoclone's throughput, and provided an EBCT (empty bed contact time) of 45 s. Analysis of total VOC measurements from the system indicated removals down to less than 5 ppm in the effluent emissions. Evaluations of opacity reductions also met project objectives with routine outlet measurements of 0–5%, which are in compliance with state regulatory guidelines. Emissions air samples were collected at different locations in the biological system for GC–MS analysis and characterization to identify specific VOCs and their removals. |
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