4th EucheMs chemistry congress

Poster Session 1
s909
chem. Listy 106, s587–s1425 (2012)
Poster session 1 - Environmental Chemistry
P - 0 0 9 7
treAtMent of oLive oiL MiLL wAStewAter By
SiLiCA-ALGinAte-funGi BioCoMPoSiteS
A. C. freitAS 3 , C. JuStino 1 , K. r. duArte 2 ,
r. PereirA 4 , M. eL Azzouzi 5 , A. zrineh 5 ,
A. duArte 1 , t. roChA-SAntoS 3
1 University of Aveiro, Department of Chemistry and CESAM,
Aveiro, Portugal
2 Instituto Piaget, ISEIT, Viseu, Portugal
3 Instituto Piaget/University of Aveiro, ISEIT /Department of
Chemistry and CESAM, Viseu /Aveiro, Portugal
4 University of Aveiro /Faculdade de Ciencias da Universidade
do Porto, Department of Biology, Aveiro /Porto, Portugal
5 University Mohammed V-Agdal, Department of Chemistry,
Rabat, Morocco
Olive oil mill wastewater (OMW) is a liquid waste which
constitutes a major environmental problem due to the presence
of a wide variety of pollutants [1] . In order to mitigate the
environmental impact of these effluents, efficient treatment
systems have been developed to reduce the COD, color, organic
compounds, and toxicity [2, 3] . In this study, we firstly report the
potential of a treatment strategy for OMW (from Portugal and
Morocco) by biocomposites of silica-alginate-fungi (Pleurotus
sajor caju and Trametes versicolor). The treatment by
biocomposites was processed on three steps for the efficient
removal of the compounds, i.e., through the adsorption of
reactants on the monolithic structure and diffusion to the
biological active sites, biodegradation by the fungi, and diffusion
of the products resulting from the biodegradation. We found
potential capacity to remove organic compounds, color, COD and
toxicity; the T. versicolor biocomposites were the most effective
and responsible for the reduction in color, COD, and total phenolic
content after 29 days of treatment. On the other hand, the toxicity
reduction on Portuguese OMW was minimal, but the use of
biocomposites on the Moroccan OMW caused a 9.5- to 19-fold
reduction in toxicity. Furthermore the proposed treatment strategy
shows great potential for tertiary treatment of OMW.
Acknowledgements: FCT (Fundacao para a
Ciencia e a Tecnologia, Portugal) scope research grants
(SFRH/BPD/73781/2010, SFRH/BPD/65410/2009, and
SFRH/BD/60429/2009) funded by QREN-POPH co-financed by
the European Social Fund and Portuguese National Funds from
MCTES, through FSE and POPH funds (Programa Ciencia
2007) and through the bilateral cooperation FCT
Portugal/CNRST Morocco.
references:
1. Justino, C.I.L, Pereira, R., Freitas, A.C., Rocha-Santos,
T.A.P., Panteleitchouk, T.S.L., Duarte, A.C., (2012).
Ecotoxicology, 21, 615-629.
2. McNamara, C.J., Anastasiou, C.C., O’Flaherty, V.,
Mitchell, R., (2008). International Biodeterioration &
Biodegradation, 61, 127-134.
3. Roig, A., Cayuela, M.L., Sánchez-Monedero, M.A.,
(2006). Waste Management, 26, 960-969.
Keywords: environmental chemistry; toxicology;
4 th EucheMs chemistry congress
P - 0 0 9 8
iMPACt of nAturAL orGAniC MAtter on the
toxiCity of nAnoPArtiCLeS
f. h. friMMeL 1 , h. SChweGMAnn 1 , M. deLAy 1
1 Karlsruhe Institute of Technology, Wasserchemie, Karlsruhe,
Germany
As of now, the risk posed by nanoparticles (NP) for the
environment has not been well examined. The effects that can
occur if NP encounter microorganisms (MO) in the environment
are of special interest as bacteria play a critical role in ecosystems.
In environmental aquatic systems the interaction of NP with water
constituents such as calcium, sodium and natural organic matter
(NOM) is of high relevance. NOM is omnipresent in aqueous
systems and can significantly change the properties of pristine NP
concerning their stability and their toxicological impact [1, 2] .
In this contribution, we follow the hypothesis that the
adsorption of NOM on the surface of NP renders their physicalchemical
behavior and will have an effect on their toxicity towards
MO.
In batch systems the adsorption of fulvic acid (FA) on
SiO -CL NP and the associated change in their zeta potential was
2
investigated. The FA served as a model for NOM and was isolated
from a brown water lake (Lake Hohloh/Black Forest, Germany)
using a standard method given in [3] . The toxicity of the NP was
determined against Pseudomonas putida (gram-negative) and
Lactobacillus plantarum (gram-positive).
The adsorption of FA onto the NP could be fitted using the
Langmuir approach. The SiO -CL NP have a point of zero charge
2
at pH = 9. Therefore, the adsorption was significantly higher
at pH-values below 9 with a maximum FA loading of
160 ± 23 µg/mg. The zeta potential of the NP changes
from +30 mV to -20 mV (at pH = 7) caused by the adsorption of
the FA.
Most MO have a negative zeta potential at neutral
pH-values. Due to the electrostatic attraction between the pristine
NP and MO, the NP cover the surface of the MO and impair their
proliferation [4]. Based on the adsorption of the FA and the change
in the zeta potential, the toxicity of the SiO -CL was diminished
2
in the presence of FA.
This detoxification effect is of general importance for
aquatic systems.
references:
1. Delay, M. and Frimmel, F.H., Nanoparticles in aquatic
systems. Analytical and Bioanalytical Chemistry, 2012.
402(2): 583-592.
2. Frimmel, F.H. and Niessner, R., Nanoparticles in the Water
Cycle: Properties, Analysis and Environmental Relevance.
2010: Springer.
3. Abbt-Braun, G., Frimmel, F.H. and Lipp, P., Isolation of
organic substances from aquatic and terrestrial systems –
comparison of some methods. Zeitschrift für
Wasser-Abwasser Forschung, 1991. 24: 285-292.
4. Schwegmann, H., Feitz, A.J. and Frimmel, F.H., Influence
of the zeta potential on the sorption and toxicity of iron
oxide nanoparticles on S. cerevisiae and E. coli. Journal
of Colloid and Interface Science, 2010. 347(1): 43-48.
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc