Institute for Sanitary Engineering, Water Quality and Solid Waste ...

Chair of Waste Management and Emissions
Monitoring of bentzotriazole in the Stuttgart
water sanitation plant, extended by degradation
experiments of carbamazepine.
The concentrations of 1-H-benzotriazol, 4-methyl-1-
H-benzotriazol and 5-methyl-1-H-benzotriazol were
monitored in the Stuttgart water sanitation plant. Therefore
a new HPLC-MS method was developed in the
labioratories of the Landeswasserversorgung in Langenau.
Samples from all five water sanitations plants in Stuttgart
were examiened. The results showed, that 4-methyl-1-H-benzotriazol
is not degraded, while 1-H-benzotriazol
and 5-methyl-1-H-benzotriazol is eliminated
up to 70%.
tryptone and glucose. Citrate was identified as a suitable
electron donor used by CRM100 during the biological
Cr(VI) reduction achieving the hightest Cr(VI)
reduction (99.7%) within a period of 7 days under 100
mg/L. The results suggested that the isolated strain
CRM100 can be used for treating industrial wastewater
containing chromium hexavalent.
Diego Salamanca (WAREM) 2009
Supervisor: Dr. N. Strunk
Master Thesis
In parallel it was tried to enrich a bacterial strain or
community, which mineralize or transform carbamazepine.
This substrate possesses only a low solubility
in water. Hence, no bacterial strain, which uses carbamazepine
as sole source of carbon and energy could
be enriched. But it was possible to identify one strain,
which uses carbamazepine as source of nitrogen.
Ngoc Diep Van (Umweltschutztechnik) 2009
Supervisor: Dr. N. Strunk
Independent Study
The strain CRM100 growth on citrate and chromium(VI).
Visible is the production of Cr(III) compounds.
Structure of the substrates
Physiology and possible industrial application of
Cr(VI) reduction using biological systems
Treatment of hexavalent chromium contaminated
wastewater
“Treatment of hexavalent chromium contaminated
wastewater”. A Bacterial strain (CRM100) isolated
from a mixture of wastewater and soil taken from the
treatment plant and boundaries of ISWA department
respectively, was capable to reduce Cr(VI) concentration
from an initial concentration 100 mg/L Cr(VI) to
0.27 mg/L Cr(VI) using citrate as carbon source. Moreover,
experiments were carried out to determine the
growth of bacteria and the Cr(VI) reduction in presence
of different carbon sources such as lactate, pyruvate,
citrate, acetate, glycerol, D-xylose, acetone,
The study was conducted to evaluate the biological reduction
of Cr(VI) as a possible treatment in industrial
wastewater. The bacterial strain CRM100 was resistant
to 1800 mg/L Cr(VI) and able to reduce 99.8% of 100
mg/L Cr(VI) using citrate as carbon source under anaerobic
conditions. CRM100 reduced 78% of 1000 mg/L
Cr(VI) within a period of 18 days. The biological Cr(VI)
resistance of CRM100 was compared with P. putida.
CRM100 was 180 times more resistant than P. putida.
The growth of P. putida was inhibited by Cr(VI) concentrations
higher than 10 mg/L Cr(VI). The influence
of factors as pH, initial concentration of carbon source
and Cr(VI) concentration was evaluated to determine
the optimal reduction process using bacterial strain
CRM100. The biological growth was affected when the
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