| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 84 === Biofilter has a better removal ability of pollutant; especially
for low volatile organic compounds (VOC). The removal of
pollutant by the peat was mainly by adsorption and
decomposition. In is study, we modified the biofilter into a
series of labortory-scale columns. We immobilised the activated
sludge on the agar or reticulate materials. In this way, cells
can be supplied with nutrient and extend its life and stability,
then we can maintenance cost and operate handly.This study can
be diveded into three parts. Main components of the inlet gas
are toluene and benzene. First, we immobilised the cells with
activated sludge slurry on agar and mixed with certain fillings
(such as compost, water, Ca3(PO4)2 and CaCO3). Then we get a
bulk sample. The sample was cut into (0.7)3 cm3 cubes and filled
into the column. The system was operated with different aeration
rates, when the aeration rate was 0.12 NL/min, The system had
better stability, VOC removal efficiency and column moisture
could be well maintained. Second, we filled reticulate material
into column proportionally in addition to the cubic agar, and
added little nutrient periodically under continuous operation.
Removal efficiency of the system can thus be enhanced because of
the added nutrient. Third, we filled (0.5)3 cm3 cubic
immobilized activated sluge into columns and replaced the
compost with coffee residue and cane residue. The immobilized
material of compost, coffee residual, and cane residue,
respectively, can promote the performance of the system to above
90%. The efficiency can also be steadily maintained at such a
high level by either of these immobilized materials. To operate
the system initially with a lower aeration rate, and then
increase the aeration rate, the stability of the operation
system as well as the removal efficiency can be improved. The
removal efficiency of above 90% can be reached before 280 hours
of operation.
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