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Author(s): S.-C. J. Hwang, Y.-H. Lin, Y.-C. Chang & S.-Y. He
Abstract:
Acclimatized dimethyl sulfoxide-degrading sludge can possess the ability to
convert DMSO to odourless compounds specifically by repeated batches in an
air-lift bioreactor.
Moreover, DMSO usually causes a low microbial biomass
growth, unstable operation and malodorous compounds emission in biological
treatment because of its characteristic for activated sludge.
A main focus of
DMSO degrading performance is conducted by original sludge without longterm
acclimation using an airlift bioreactor in this study.
The result indicates
various organisms of sludge poisoned by DMSO still secrete inducible
oxidoreductase to improve volatile organic sulphur compounds degradation
using DMSO as a substrate in an air-lift bioreactor.
Using this method, the
oxidoreductase in the supernatant of working medium is able to remove DMSO
concentration from 50 up to 1000 mg L-1 completely by fed batch mode due to
LB medium cultures and enhances the microbial activity of activated sludge.
An
optimal alternative performance was developed; the rate of DMSO
biodegradation can accomplish 34.72 mg-DMSO h-1g-1-dry sludge weight.
The
best result showed that 500 mg L-1 of DMSO could be completely removed with
120 h under repeated mode.
Control of microbial activity in high loading of
DMSO and carbon content in wastewater were important factors for
biodegradation of DMSO.
Keywords:
DMSO, VOCs, activated sludge, biodegradation, airlift bioreactor.
...
Pages: 11
Size: 401 kb
Paper DOI: 10.2495/WM120361
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