Hillebrand, Olav

[["dc.bibliographiccitation.firstpage","251"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Grundwasser"],["dc.bibliographiccitation.lastpage","262"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Reh, Roland"],["dc.contributor.author","Hillebrand, Olav"],["dc.contributor.author","Geyer, Tobias"],["dc.contributor.author","Noedler, Karsten"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Sauter, Martin"],["dc.date.accessioned","2018-11-07T09:32:14Z"],["dc.date.available","2018-11-07T09:32:14Z"],["dc.date.issued","2014"],["dc.description.abstract","In the presented work the occurrence of organic micro-pollutants is discussed for two karst areas with different geological characteristics and land-use patterns. Within an urban moderately karstified catchment with a large number of local input sources (e.g. contaminated sites, sewer leakages), a greater variety of micro-pollutants is found compared to a rural area. Mostly the concentrations of these compounds decrease below quantification limits before emerging at the spring and can therefore only be detected by a comprehensive network of sampling points. Springs show the presence of micro-pollutants, either recently applied in large amounts or characterized by high persistence. At the outlet of a highly karstified and consequently highly permeable aquifer readily biodegradable compounds are detected. Due to high groundwater flow velocities investigations of micro-pollutants require a highly resolved monitoring. Therefore, beside substance properties, also hydrogeological characteristics affect the spectrum of detectable micro-pollutants."],["dc.identifier.doi","10.1007/s00767-014-0264-6"],["dc.identifier.isi","000345078800003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31709"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Heidelberg"],["dc.relation.issn","1432-1165"],["dc.relation.issn","1430-483X"],["dc.title","Application of organic micro-pollutants for the characterisation of two karst systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","395"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Water Research"],["dc.bibliographiccitation.lastpage","402"],["dc.bibliographiccitation.volume","46"],["dc.contributor.author","Hillebrand, Olav"],["dc.contributor.author","Noedler, Karsten"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Sauter, Martin"],["dc.contributor.author","Geyer, Tobias"],["dc.date.accessioned","2018-11-07T09:14:02Z"],["dc.date.available","2018-11-07T09:14:02Z"],["dc.date.issued","2012"],["dc.description.abstract","Contamination from untreated wastewater leakage and related bacterial contamination poses a threat to drinking water quality. However, a quantification of the magnitude of leakage is difficult. The objective of this work is to provide a highly sensitive methodology for the estimation of the mass of untreated wastewater entering karst aquifers with rapid recharge. For this purpose a balance approach is adapted. It is based on the mass flow of caffeine in spring water, the load of caffeine in untreated wastewater and the daily water consumption per person in a spring catchment area. Caffeine is a source-specific indicator for wastewater, consumed and discharged in quantities allowing detection in a karst spring. The methodology was applied to estimate the amount of leaking and infiltrating wastewater to a well investigated karst aquifer on a daily basis. The calculated mean volume of untreated wastewater entering the aquifer was found to be 2.2 +/- 0.5 m(3) d(-1) (undiluted wastewater). It corresponds to approximately 0.4% of the total amount of wastewater within the spring catchment. (C) 2011 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","German Federal Ministry of Education and Research [02WM1081, 02WRS1277A]"],["dc.identifier.doi","10.1016/j.watres.2011.11.003"],["dc.identifier.isi","000299609400014"],["dc.identifier.pmid","22104295"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27307"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0043-1354"],["dc.title","Caffeine as an indicator for the quantification of untreated wastewater in karst systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5381"],["dc.bibliographiccitation.issue","16"],["dc.bibliographiccitation.journal","Water Research"],["dc.bibliographiccitation.lastpage","5388"],["dc.bibliographiccitation.volume","46"],["dc.contributor.author","Hillebrand, Olav"],["dc.contributor.author","Noedler, Karsten"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Sauter, Martin"],["dc.contributor.author","Geyer, Tobias"],["dc.date.accessioned","2018-11-07T09:04:37Z"],["dc.date.available","2018-11-07T09:04:37Z"],["dc.date.issued","2012"],["dc.description.abstract","Little is known with respect to the attenuation capacity of karst aquifers. Even less is known about the risk posed by emerging micropollutants in these systems. In order to identify the attenuation potential of karst aquifers in-situ and to estimate the risk posed by micropollutants, a dualtracer test was conducted in this study in order to investigate differential transport in the subsurface: The reactive compound caffeine was used as a tracer to indicate the attenuation capacity within the aquifer in-situ. Due to the low limit of quantification, only small amounts of caffeine needed to be injected. To calibrate a model and to visualize the attenuation of caffeine a conservative reference tracer (uranine) is injected simultaneously. The methodology is tested in a well-characterised karst system in southwest Germany. The results indicate a significantly higher attenuation rate than was expected for karst aquifers. The attenuation is decribed as a first-order process. The corresponding half-life is 104 h. This low half-life suggests that a generally assumed low natural attenuation capacity of karst aquifers is unjustified. The observed mass loss of caffeine illustrates the potential of caffeine to be used as reactive tracer for indicating in-situ attenuation capacity within highly hydraulically conductive systems, such as karst aquifers. Due to the high attenuation rate of caffeine it does not pose a threat as a longtime contaminant. In combination with a conservative reference tracer an economical and environmentally benign method is presented in this manuscript for the in-situ determination of the attenuation capacity of highly conductive aquifer systems. (C) 2012 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","German Federal Ministry of Education and Research [02WRS1277A]"],["dc.identifier.doi","10.1016/j.watres.2012.07.032"],["dc.identifier.isi","000309095800046"],["dc.identifier.pmid","22877878"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25147"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0043-1354"],["dc.title","Identification of the attenuation potential of a karst aquifer by an artificial dualtracer experiment with caffeine"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","338"],["dc.bibliographiccitation.journal","The Science of The Total Environment"],["dc.bibliographiccitation.lastpage","343"],["dc.bibliographiccitation.volume","506"],["dc.contributor.author","Hillebrand, Olav"],["dc.contributor.author","Noedler, Karsten"],["dc.contributor.author","Sauter, Martin"],["dc.contributor.author","Licha, Tobias"],["dc.date.accessioned","2018-11-07T10:00:56Z"],["dc.date.available","2018-11-07T10:00:56Z"],["dc.date.issued","2015"],["dc.description.abstract","The increasing pressure on drinking water resources necessitates an efficient management of potential and actual drinking water resources. Karst aquifers play a key role in the supply of the world's population with drinking water. Around one quarter of all drinking water is produced from these types of aquifers. Unfortunately due to the aquifer characteristics with extremely high hydraulic conductivities and short residence times, these systems are vulnerable to contamination. For successful management, a fundamental understanding of mass transport and attenuation processes with respect to potential contaminants is vital. In this study, a multitracer experiment was performed in a karst aquifer in SW-Germany for determining the attenuation capacity of a karst environment by assessing the environmental fate of selected relevant micropollutants. Uranine, acesulfame and carbamazepine were injected into a sinkhole as reference tracers together with the reactive compounds atenolol, caffeine, cyclamate, ibuprofen and paracetamol (also known as acetaminophen). The breakthrough of the tracers was monitored at a karst spring at a distance of ca. 3 km. The breakthrough curves of the reactive compounds were interpreted relative to the reference substances. No significant retardation was found for any of the investigated micropollutants. The determined half-lives of the reactive compounds range from 38 to 1400 h (i.e. persistent within the investigation period) in the following order (from high to no observed attenuation): paracetamol > atenolol approximate to ibuprofen > caffeine >> cyclamate. The attenuation rates are generally in agreement with studies from other environmental compartments. The occurrence of the biotransformation product atenolol acid served as evidence for in-situ biodegradation within the aquifer system. (C) 2014 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","German Federal Ministry of Education and Research [02WRS1277A]"],["dc.identifier.doi","10.1016/j.scitotenv.2014.10.102"],["dc.identifier.isi","000347576800036"],["dc.identifier.pmid","25460968"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37910"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1879-1026"],["dc.relation.issn","0048-9697"],["dc.title","Multitracer experiment to evaluate the attenuation of selected organic micropollutants in a karst aquifer"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]