Preparation of NSC Project Repor ts
Date Issued
2001-07-31
Date
2001-07-31
Author(s)
於幼華
DOI
892211E002096
Abstract
Integration of chemical and biological
processes for recalcitrant or inhibitory
contaminant treatment is an advantageous
concept. The aim of chemical oxidation is to
partially oxidize the recalcitrant contaminants
to more easily biodegradable intermediates
since a total mineralization may be not cost
effective. However, preoxidation of
wastewaters may show some adverse effect
on biological processes because some
byproducts formed during oxidation appear
to be more toxic than the original compound.
Therefore, chemical oxidation products play
a key role in the total process. In our study,
ozonation and a single compound
p-nitrophenol were chosen as the model
chemical pretreatment and the target
compound. First, this study was undertaken
to examine the reaction between ozone and
p-nitrophenol. The purpose of this part is to
develop an understanding of the ozonation
process for nitrophenolic compounds.
Besides, this research also focuses on the
biological process. Sequencing Batch
Reactors (SBRs) were chosen to be the
subsequent biological system. Different from
any previous researches concerning
combined processes, a detailed
community-level characterization ofmicrobial biomass from SBRs, was carried
out using BIOLOG redox-based carbon
source utilization assay. Ozonation of
p-nitrophenol followed by lab-scale SBRs,
rather than biodegradability tests, was
conducted in the research. By observing the
degradation of intermediates, the elimination
of DOC, color and toxicity, and the variation
of microbial ecologies, several conclusions
can be drawn as followed: Under an
ozonation period less than 150 min,
ozonation of p-nitrophenol generates
nonbiodegradable compounds, and this will
bring about some adverse effects to the
biological system, such as an increase of the
effluent DOC and color, and an less healthy
and diverse microbial community. However,
under an ozonation period longer than 150
min (>25% TOC reduction), these adverse
effects will be eliminated. Therefore, the
extent of ozonation plays a key role in the
total process, and an improper ozonation time
should be prevented.
Subjects
Ozonation
Biodegradation
Biolog
SDGs
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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