October 2017

Event Date: 
Tuesday, October 31, 2017 - 18:00 - 18:15
Institution: 
Technical University of Munich (TUM)
Title: 

Biotransformation of trace organic chemicals in natural treatment systems

Abstract: 

Biotransformation is known as the most relevant removal mechanism for trace organic chemicals (TOrCs) in natural treatment systems (Alidina et al., 2014) which have a great potential to efficiently remove microbial contaminants, organic matter and several TOrCs (Tufenkji et al., 2002). Based on recent studies pointing out an enhanced transformation of TOrCs under oxic and carbon-limited conditions (e.g. Regnery et al., 2015), the sequential managed aquifer recharge technology (SMART) was established (Regnery et al., 2016). The combination of two infiltration steps with an intermediate re-aeration results in favorable oxic and carbon-limited conditions in the second infiltration step (Regnery et al., 2016). In addition to the Prairie Waters Project in Aurora (Colorado, USA) (Regnery et al., 2016), the SMART concept was successfully demonstrated in laboratory-scale and field-scale experiments in Berlin, Germany (Hellauer et al., 2017a; Hellauer et al., 2017b). Recent studies revealed an overrepresentation of genes which are involved in the xenobiotic degradation and therefore an enhanced TOrCs removal such as cytochrome P450 in sediments under carbon starving conditions (Li et al., 2014). Based on the approach of Lauro et al. (2009) identifying genomic markers for copio- and oligotrophic organisms in the marine environment, specific genomic features which are characteristic for microbial communities under prevailing carbon-limited conditions in soil should be elucidated. 
References 
Alidina, M., Li, D., Drewes, J.E., 2014. Investigating the role for adaptation of the microbial community to transform trace organic chemicals during managed aquifer recharge. Water Res. 56, 172–180. Hellauer, K., Karakurt, S., Sperlich, A., Burke, V., Massmann, G., Hübner, U., Drewes, J.E., 2017a. Establishing Sequential Managed Aquifer Recharge Technology (SMART) for Enhanced Removal of Trace Organic Chemicals: Experiences from field studies in Berlin, Germany. submitted. J. Hydrol. 
Hellauer, K., Mergel, D., Ruhl, A., Filter, J., Hübner, U., Jekel, M., Drewes, J.E., 2017b. Advancing Sequential Managed Aquifer Recharge Technology (SMART) Using Different Intermediate Oxidation Processes. Water 9 (3), 221. 
Lauro, F.M., McDougald, D., Thomas, T., Williams, T.J., Egan, S., Rice, S., DeMaere, M.Z., Ting, L., 
Ertan, H., Johnson, J., Ferriera, S., Lapidus, A., Anderson, I., Kyrpides, N., Munk, A.C., Detter, C., Han, C.S., Brown, M.V., Robb, F.T., Kjelleberg, S., Cavicchioli, R., 2009. The genomic basis of trophic strategy in marine bacteria. Proc. Natl. Acad. Sci. U.S.A. 106 (37), 15527–15533. 
Li, D., Alidina, M., Drewes, J.E., 2014. Role of primary substrate composition on microbial community structure and function and trace organic chemical attenuation in managed aquifer recharge systems. Appl. Microbiol. Biotechnol. 98 (12), 5747–5756. 
Regnery, J., Wing, A.D., Alidina, M., Drewes, J.E., 2015. Biotransformation of trace organic chemicals during groundwater recharge: How useful are first-order rate constants? J. Contam. Hydrol. 179, 65–75. 
Regnery, J., Wing, A.D., Kautz, J., Drewes, J.E., 2016. Introducing sequential managed aquifer recharge technology (SMART) – From laboratory to full-scale application. Chemosphere 154, 8–16. Tufenkji, N., Ryan, J.N., Elimelech, M., 2002. The promise of bank filtration. Environ. Sci. Technol. 36 (21), 422A–428A.

Event Date: 
Tuesday, October 31, 2017 - 18:15 - 18:30
Institution: 
University of Arizona
Title: 

The Impact of Wastewater Treatment on the Development of AR in the Environment

Event Date: 
Tuesday, October 31, 2017 - 19:15 - 19:45
Institution: 
Helmholtz Zentrum Munich
Title: 

Snot or not: Functional microbiome dissection of massive methane-fueled biofilms discovered in an iodine-rich spring cavern

Abstract: 

Massive biofilms have recently been discovered in the cave of a former medicinal spring, already mentioned due to its high iodine content by the famed chemist Justus von Liebig in the 19th century. The biofilms completely cover the walls and ceilings of the cave, giving rise to speculations about their metabolism and the main drivers of biofilm formation. We address these questions using tools of geochemistry, biofilm imaging and molecular microbiome dissection. Although the cave is situated just several meters below the surface, microbial communities largely independent from surface carbon and energy inputs were discovered. Stable isotope analysis indicated that thermogenic methane emerging into the cave along with iodine-rich formation water served as important driver of biofilm formation. Biofilm microbiota were surprisingly diverse, with a host of populations closely related to well-known methanotrophs, methylotrophs, and also potentially iodine-cycling bacteria. Evidence is provided that the massive EPS production observed could serve as an electron sink for methylotrophs, as well as a protective barrier against possible toxic iodine species in the cave. This research shows that cave ecosystems can provide us with important glimpses into the potentially unique biogeochemical processes ongoing below our feet.
Karwautz C, Kus G, Stockl M, Neu TR, Lueders T (2017) Microbial megacities fueled by methane oxidation in a mineral spring cave. ISME J doi: 10.1038/ismej.2017.146