Using a biological aerated filter to treat mixed water-borne volatile organiccompounds and assessing its emissions
CHENG Wen-His
DOI:
Received January 09, 2009,Revised March 05, 2009, Accepted , Available online
Volume 21,2009,Pages 1497-1502
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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 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.
