可同時硝化及脫硝之自營性薄膜生物反應槽之研發及其菌群結構分析(2/2)
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
曾四恭
DOI
922211E002069
Abstract
To develop a laboratory-scale autotrophic
membrane-immobilized biofilm reactor to remove
nitrogen from drinking water. A PVA-immobilized
biofilm, attached to the surface of a silicone tube,
was used as the basis of a bioreactor for
simultaneous nitrification and denitrification of
water. The bioreactor was aerated with air to supply
oxygen for nitrification and pure hydrogen was
supplied to the silicone tube and diffused through
the membrane wall to feed the biofilm for autotrophic
denitrification. The bioreactor was effective for
the simultaneous nitrification and denitrification
of water after a short period of acclimation, while
the biofilm exhibited good resistance to the
inhibition of denitrification by dissolved oxygen;
the denitrification rate decreased by only 8 % as the
dissolved oxygen increased from 2 mg/l to saturation.
By using PVA crosslinked with sodium nitrate to
entrap nitrifying and denitrifying sludge on the
surface of a silicone tube, a novel bioreactor for
simultaneous nitrification and denitrification was
developed. In addition to performing as an
immobilizing agent to strengthen the biofilm, PVA
protected the denitrifying microorganisms to reduce
the inhibition by dissolved oxygen under aerobic
condition. Therefore, nitrification and
denitrification occurred simultaneously within the
biofilm. Furthermore, the immobilization technique
shortened the acclimation period of the bioreactor.
In addition, the genera Xanthomonas and Thauera
dominated the inner layer of the biofilm, while
Nitrospira dominated the outer layer of the biofilm.
Subjects
Nitrification
Denitrification
Membrane
bioreactor
bioreactor
Autotrophic
Bacterial community
analysis
analysis
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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