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J Environ Sci (China)

Title:		Using a biological aerated filter to treat mixed water-borne volatile organic compounds and assessing its emissions
Author(s):		Cheng WH;
Address:		"Department of Occupational Safety and Hygiene, Fooyin University, Kaohsiung County 83102, Taiwan, China. PL031@mail.fy.edu.tw"
Journal Title:		J Environ Sci (China)
Year:		2009
Volume:		21
Issue:		11
Page Number:		1497 - 1502
DOI:		10.1016/s1001-0742(08)62446-8
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"A biological aerated filter (BAF) was evaluated as a fixed-biofilm process to remove water-borne volatile organic compounds (VOCs) from a multiple layer ceramic capacitor (MLCC) manufacturing plant in southern Taiwan. The components of VOC were identified to be toluene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, bromodichloromethane and isopropanol (IPA). The full-scale BAF was constructed of two separate reactors in series, respectively, using 10- and 15-cm diameter polypropylene balls as the packing materials and a successful preliminary bench-scale experiment was performed to feasibility. Experimental results show that the BAF removed over 90% chemical oxygen demand (COD) from the influent with (1188 +/- 605) mg/L of COD. A total organic loading of 2.76 kg biochemical oxygen demand (BOD)/(m3 packing x d) was determined for the packed bed, in which the flow pattern approached that of a mixed flow. A limited VOC concentration of (0.97 +/- 0.29) ppmv (as methane) was emitted from the BAF system. Moreover, the emission rate of VOC was calculated using the proposed formula, based on an air-water mass equilibrium relationship, and compared to the simulated results obtained using the Water 9 model. Both estimation approaches of calculation and model simulation revealed that 0.1% IPA (0.0031-0.0037 kg/d) were aerated into a gaseous phase, and 30% to 40% (0.006-0.008 kg/d) of the toluene were aerated"
Keywords:		"Bioreactors/*microbiology Filtration/instrumentation/*methods Gas Chromatography-Mass Spectrometry Hydrocarbons, Aromatic/*metabolism Water Pollutants, Chemical/*metabolism;"
Notes:		"MedlineCheng, Wen-Hsi eng Comparative Study Netherlands 2010/01/30 J Environ Sci (China). 2009; 21(11):1497-502. doi: 10.1016/s1001-0742(08)62446-8"