FG Wasserreinhaltung

18 Items

Recent Submissions
Water Lice and Other Macroinvertebrates in Drinking Water Pipes: Diversity, Abundance and Health Risk

Gunkel, Günter ; Michels, Ute ; Scheideler, Michael (2021-01-24)

Activities to ensure and maintain water quality in drinking water networks, including flushing, are presented after standardized hydrant sampling combined with a stainless-steel low pressure–high flow rate (NDHF) filter and a 100 µm mesh size was used to separate pipe inhabitants. A databank of more than 1000 hydrant samples in European lowland areas was developed and used to analyze the divers...

Particle Size and Pre-Treatment Effects on Polystyrene Microplastic Settlement in Water: Implications for Environmental Behavior and Ecotoxicological Tests

Eitzen, Lars ; Ruhl, Aki Sebastian ; Jekel, Martin (2020-12-08)

Microplastic (MP) particle dispersions used in many recent publications covering adsorption or toxicological studies are not characterized very well. The size distribution of polydisperse dispersions is highly dependent on the agglomeration processes and influences experimental outcomes. Therefore, pre-treatment is a prerequisite for reproducibility. In this study, manual/automated shaking and ...

Episodic Decrease in Temperature Increases mcy Gene Transcription and Cellular Microcystin in Continuous Cultures of Microcystis aeruginosa PCC 7806

Martin, Robbie M. ; Moniruzzaman, Mohammad ; Stark, Gwendolyn F. ; Gann, Eric R. ; Derminio, Dominique S. ; Wei, Bofan ; Hellweger, Ferdi L. ; Pinto, Ameet ; Boyer, Gregory L. ; Wilhelm, Steven W. (2020-12-03)

Microcystins produced during harmful cyanobacterial blooms are a public health concern. Although patterns are emerging, the environmental cues that stimulate production of microcystin remain confusing, hindering our ability to predict fluctuations in bloom toxicity. In earlier work, growth at cool temperatures relative to optimum (18°C vs. 26°C) was confirmed to increase microcystin quota in ba...

Interacting Effects of Polystyrene Microplastics and the Antidepressant Amitriptyline on Early Life Stages of Brown Trout (Salmo trutta f. fario)

Schmieg, Hannah ; Burmester, Janne K.Y. ; Krais, Stefanie ; Ruhl, Aki S. ; Tisler, Selina ; Zwiener, Christian ; Köhler, Heinz-R. ; Triebskorn, Rita (2020-08-22)

Whether microplastics themselves or their interactions with chemicals influence the health and development of aquatic organisms has become a matter of scientific discussion. In aquatic environments, several groups of chemicals are abundant in parallel to microplastics. The tricyclic antidepressant amitriptyline is frequently prescribed, and residues of it are regularly found in surface waters. ...

Mikroplastik im Wasserkreislauf

Jekel, Martin ; Anger, Philipp ; Bannick, Claus Gerhard ; Barthel, Anne-Kathrin ; Braun, Ulrike ; Braunbeck, Thomas ; Dittmar, Stefan ; Eisentraut, Paul ; Elsner, Martin ; Gnirß, Regina ; Grummt, Tamara ; Hanslik, Lisa ; Huppertsberg, Sven ; Ivleva, Natalia P. ; Klöckner, Philipp ; Knepper, Thomas P. ; Köhler, Heinz-R. ; Krais, Stefanie ; Kuckelkorn, Jochen ; May, Elisabeth ; Müller, Yanina Katharina ; Nießner, Reinhard ; Obermaier, Nathan ; Oehlmann, Jörg ; Pittroff, Marco ; Reemtsma, Thorsten ; Schmieg, Hannah ; Schmitt, Thomas ; Schür, Christoph ; Storck, Florian Rüdiger ; Strobel, Claudia ; Triebskorn, Rita ; Wagner, Martin ; Wagner, Stephan ; Witzig, Cordula Sonja ; Zumbülte, Nicole ; Ruhl, Aki Sebastian (2020)

Das interdisziplinäre Forschungsprojekt MiWa widmete sich grundlegenden Fragestellungen zur Analytik und Wirkung von Mikroplastik-Partikeln im Wasserkreislauf. Es wurden Methoden der Umweltprobennahme, der Probenaufbereitung und verschiedene Detektionsverfahren zur Charakterisierung und Quantifizierung von Mikroplastik intensiv untersucht, miteinander verglichen und weiterentwickelt. Öko- und h...

Specific adsorption sites and conditions derived by thermal decomposition of activated carbons and adsorbed carbamazepine

Dittmann, Daniel ; Eisentraut, Paul ; Goedecke, Caroline ; Wiesner, Yosri ; Jekel, Martin ; Ruhl, Aki Sebastian ; Braun, Ulrike (2020-04-21)

The adsorption of organic micropollutants onto activated carbon is a favourable solution for the treatment of drinking water and wastewater. However, these adsorption processes are not sufficiently understood to allow for the appropriate prediction of removal processes. In this study, thermogravimetric analysis, alongside evolved gas analysis, is proposed for the characterisation of micropollut...

Quantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide

Hilbrandt, Inga ; Lehmann, Vito ; Zietzschmann, Frederik ; Ruhl, Aki Sebastian ; Jekel, Martin (2019-07-30)

Adsorption onto ferric hydroxide is a known method to reach very low residual phosphate concentrations. Silicate is omnipresent in surface and industrial waters and reduces the adsorption capacity of ferric hydroxides. The present article focusses on the influences of silicate concentration and contact time on the adsorption of phosphate to a micro-sized iron hydroxide adsorbent (μGFH) and fits...

Management of Tropical River Basins and Reservoirs under Water Stress: Experiences from Northeast Brazil

Marques, Érika Tavares ; Gunkel, Günter ; Sobral, Maria Carmo (2019-06-04)

Due to global warming, a reduction in available water will occur in many watersheds and conflicts concerning water use will take place. This situation is already typical in semi-arid areas, where many reservoirs have been constructed for water storage. Increased energy demands and climate change have led to severe and increasing pressure on aquatic systems. Today, the environmental policies of ...

Fate of Trace Organic Compounds in Granular Activated Carbon (GAC) Adsorbers for Drinking Water Treatment

Sperlich, Alexander ; Harder, Mareike ; Zietzschmann, Frederik ; Gnirss, Regina (2017-06-30)

Granular activated carbon (GAC) adsorbers for drinking water treatment were operated for approx. 14 months and the breakthrough of dissolved organic carbon (DOC) and trace organic chemicals (TOrCs) was monitored. Effluent concentration profiles of gabapentin and valsartan acid increase already at throughputs of <10,000 BV. The corresponding breakthrough curves flatten out without reaching the i...

Advancing Sequential Managed Aquifer Recharge Technology (SMART) Using Different Intermediate Oxidation Processes

Hellauer, Karin ; Mergel, Dorothea ; Ruhl, Aki Sebastian ; Filter, Josefine ; Hübner, Uwe ; Jekel, Martin ; Drewes, Jörg E. (2017-03-17)

Managed aquifer recharge (MAR) systems are an efficient barrier for many contaminants. The biotransformation of trace organic chemicals (TOrCs) strongly depends on the redox conditions as well as on the dissolved organic carbon availability. Oxic and oligotrophic conditions are favored for enhanced TOrCs removal which is obtained by combining two filtration systems with an intermediate aeration...

Understanding and Control of Biopolymer Fouling in Ultrafiltration of Different Water Types

Zheng, Xing ; Zietzschmann, Frederik ; Plume, Stephan ; Paar, Hendrik ; Ernst, Mathias ; Wang, Zi ; Jekel, Martin (2017-04-23)

The present work focuses on understanding and control of biopolymer fouling in ultrafiltration of a typical surface water and nearby secondary effluent for direct and indirect portable use. Characterization results show that both kinds of biopolymers are of similar molecular weight. Longer than one year water quality monitoring results show that the C/N ratio in the secondary effluent biopolyme...

Impacts of Accumulated Particulate Organic Matter on Oxygen Consumption and Organic Micro-Pollutant Elimination in Bank Filtration and Soil Aquifer Treatment

Filter, Josefine ; Jekel, Martin ; Ruhl, Aki Sebastian (2017-05-16)

Bank filtration (BF) and soil aquifer treatment (SAT) are efficient natural technologies in potable water reuse systems. The removal of many organic micro-pollutants (OMPs) depends on redox-conditions in the subsoil, especially on the availability of molecular oxygen. Due to microbial transformation of particulate and dissolved organic constituents, oxygen can be consumed within short flow dist...

TestTools – Entwicklung und Validierung von schnellen Testmethoden zum Spurenstoffverhalten in technischen und natürlichen Barrieren des urbanen Wasserkreislaufs

Zietzschmann, Frederik ; Stapf, Michael ; Sperlich, Alexander ; Ruhl, Aki Sebastian ; Miehe, Ulf ; Gnirß, Regina ; Jekel, Martin (2018)

Das Verbundprojekt „TestTools“ hat vielfältige Untersuchungen zur Verwendbarkeit unterschiedlicher Testmethoden hinsichtlich des Spurenstoffverhaltens in natürlichen und technischen Barrieren durchgeführt. Entsprechend der gewonnenen Ergebnisse können die folgenden knapp zusammengefassten Aussagen getätigt werden. Zur Pulveraktivkohle-(PAK)-Dosierung im Labor sollten benetzte, entgaste Stamms...

Conditioning fixed-bed filters with fine fractions of granulated iron hydroxide (µGFH)

Hilbrandt, Inga ; Ruhl, Aki Sebastian ; Jekel, Martin (2018-09-25)

The fine fraction of granular ferric hydroxide (µGFH, <0.3 mm) is a promising adsorbent for the removal of heavy metals and phosphate, but properties of µGFH were hitherto not known. The present study aimed at characterizing µGFH regarding its physical and chemical properties and at evaluating methods for the conditioning of fixed-bed filters in order to develop a process that combines filtrati...

The role of water level fluctuations in the promotion of phytoplankton and macrophyte pioneer species in a tropical reservoir in the Brazilian semiarid

Maciel Barros Lima, Débora (2018)

In the semiarid northeast Brazil, water paucity instigates multiple uses of reservoirs, such as hydropower production, drinking water supply, water supply for livestock and for irrigation, fisheries, aquaculture and leisure activities. As consequence of high anthropogenic pressure, most reservoirs in this region are fragile and eutrophicated systems. Blooms of algae and macrophytes are commonly...

Greenhouse gases emissions in a semi-arid reservoir in Northeastern Brazil

Rodríguez Góngora, Maricela (2018)

Total emissions of the greenhouse gases (GHG) carbon dioxide (CO2) and methane (CH4) from the Itaparica, a semi-arid reservoir, were estimated about 2.3 × 105 ± 0.75 × 105 t C yr-1 or 1.33 × 106 ± 0.45 × 106 t CO2-eq yr-1. Diffusion across the water surface was the main pathway accounting for 96 % of total carbon emissions. Ebullition was limited to littoral areas. A slight accumulation of CO2,...

Invertebraten in Trinkwasserverteilungssystemen

Michels, Ute (2018)

The central theme of this dissertation is the presence of invertebrates in drinking water distribution systems. The presented analyses are based on investigations in various drinking water networks during the 2003-2015 period, primarily conducted as part of water management monitoring programs. Some data was collected in the framework of the "Development of a mobile sampling and measuring syste...

Analysis of community based nature oriented surface water treatment

Chakrabarti, Ronjon (2017)

In this thesis the development, implementation and analysis of a full scale pilot for drinking water supply is elaborated. The intention of the study lies in identifying and verifying methodologies, technologies and approaches which lead to the sustainable setup of water resource protection, water purification and distribution, with the aim of providing safe drinking water to all people in an a...