Lake Tegel and Schlachtensee in Berlin show a uniquely pronounced trophic recovery in response to an abrupt and drastic (40- to 100-fold) reduction of their external phosphorus (P) load through P-stripping at their main inflow which exchanges the lake water volume about 5 times per year for Lake Tegel and about 1.5 times for Schlachtensee. Veröffentlicht in Texte | 45/2011.
Das Umweltbundesamt ( UBA )-Projekt „Auswirkung des Klimawandels auf die Wasserverfügbarkeit - Anpassung an Trockenheit und Dürre in Deutschland“ (WADKlim) erforscht die Auswirkungen von Trockenheit und Dürre auf das Wasserdargebot , den Bodenwasserhaushalt und die Grundwasserverfügbarkeit in Deutschland. Das Projekt schafft einen Überblick über die gegenwärtige Wasserverfügbarkeit in Deutschland , sowie deren zukünftigen Entwicklung unter Klimawandelbedingungen. Weiterhin analysiert das Vorhaben aktuelle und zukünftige Wassernutzungskonflikte in Deutschland und entwickelt Lösungsstrategien und Maßnahmen , die zum vorausschauenden Umgang und zur Vermeidung von Nutzungskonflikten beitragen können. Zudem werden die Möglichkeiten, Chancen und Risiken der Wasserwiederverwendung zur Bewässerung im urbanen Raum dargestellt und bewertet. Veröffentlicht in Texte | 143/2024.
In this scientific opinion paper the German Environment Agency expresses its recommendations for the development of EU minimum quality requirements for water reuse for agricultural irrigation and aquifer recharge. More ambitious quality standards that complement the current EU legislation and are in line with the precautionary principle are needed to protect human health and the environment in a sustainable way. Quelle: https://www.umweltbundesamt.de
Behandeltes kommunales Abwasser (im Folgenden als Klarwasser bezeichnet) wird in Deutschland in der Regel in Oberflächengewässer eingeleitet, wodurch es Bestandteil des natürlichen Wasserkreislaufes wird. In Ergänzung zur Nutzung von natürlichem Grundwasser stellen Oberflächengewässer via Uferfiltration oder künstlicher Grundwasseranreicherung auch eine wichtige Ressource für die Trinkwasserversorgung dar. Mit erhöhten Klarwasseranteilen in Fließgewässern steigt auch der Anteil abwasserbürtiger Stoffe. Das Ziel der vorliegenden Studie war, erstmalig eine deutschlandweite Einschätzung der Klarwasseranteile in Fließgewässern als Funktion verschiedener Abflussverhältnisse (mittlerer Abfluss (MQ), mittlerer Niedrigwasserabfluss (MNQ)) zu geben und deren Bedeutung für die Trinkwassergewinnung aus Fließgewässern für einzelne Flusseinzugsgebiete und Flussabschnitte zu bewerten. Dafür wurden Einleitungen aus 7.550 kommunalen Kläranlagen im gesamten Bundesgebiet sowie relevanten Anrainerstaaten berücksichtigt. Die Ergebnisse dieser Erhebung wurden sowohl in einem geografischen Informationssystem (GIS) als auch in Karten für Flusseinzugsgebiete visuell dargestellt. Gerade MNQ Bedingungen dominieren in vielen Flusseinzugsgebieten häufig über viele Monate und können im Rahmen des Klimawandels noch dominanter werden. Weiterhin wurden für die Bundesländer, in denen Uferfiltration oder eine künstliche Grundwasseranreicherung praktiziert wird, Standorte der Trinkwassergewinnung über ausgewiesene Wasserschutzgebietszonen ermittelt. Für ausgewählte Standorte wurde dann eine fallspezifische Betrachtung bezüglich des Einflusses auf die Trinkwasserqualität durchgeführt und durch verfügbare Messdaten konservativer, abwasserbürtiger Stoffe validiert. Aufbauend auf diesen Erkenntnissen und einer qualitativen Risikoabschätzung werden Handlungsoptionen für den vorsorgenden Grundwasser- und Trinkwasserschutz vorgeschlagen. Die Ergebnisse dieser Studie deuten an vielen Standorten einen, wenn auch zeitlich begrenzten, deutlichen Einfluss hin und unterstreichen die Notwendigkeit eines Verständnisses der Dynamik des gesamten Einzugsgebietes bei einer Trinkwassergewinnung aus Uferfiltration und damit von Klarwasseranteilen im Oberstrom eines Oberflächengewässers sowie der zugrundeliegenden lokalen hydrogeologischen Bedingungen einer Uferfiltration bzw. künstlichen Grundwasseranreicherung. Quelle: Forschungsberichte
Managed aquifer recharge systems for drinking water reclamation are challenged by trace organic chemicals (TOrCs) since some of them are poorly retained. Although a lot of research has been done to investigate biological transformation of TOrCs in sand filter systems, there are still uncertainties to predict the removal. A laboratory column system with two different filter sands was set up to test TOrC transformation, the influence of low oxygen concentrations as well as the adaptation and influence of spiked TOrC influent concentrations. Bioactivity was quantified with the fluorescence tracer resazurin. In the experiment, a low elimination performance in the first column segment, defined as lag zone, was observed, implying incomplete adaptation or inhibiting co-factors. To assess these lag zones and to determine the dissipation time DT50 for 50% removal, a modified Gompertz model was applied. For acesulfame, formylaminoantipyrine, gabapentin, sulfamethoxazole, and valsartan acid DT50 of less than 10 h were observed, even when influent oxygen concentrations decreased to 0.5 mg/L. In general, TOrC transformations in technical sand with lower bioactivity and especially valsartan acid transformation responded very sensitive to low influent oxygen concentrations of 0.5 mg/L. However, in well adapted sand originating from soil aquifer treatment (SAT) with sufficient bioactivity, TOrC removal was hardly affected by such suboxic conditions. Furthermore, increasing the influent concentrations of TOrCs to 10 ÎÌg/L was found to promote adaptation especially for acesulfame and sulfamethoxazole. Benzotriazole, carbamazepine, diclofenac and venlafaxine were recalcitrant under the applied experimental conditions. © 2023 Elsevier
The treatment with ultraviolet (UV) light is a well-known technique for water disinfection. Photodegradation by UV light is in discussion as measure for advanced water treatment that could provide a potential removal option for micropollutants. Micropollutants such as ingredients from personal care products are also present in grey water. Grey water gets increasingly attention as a source for water reuse. For that purpose it has to be treated. UV-treatment is an option. However, the knowledge on the fate of micropollutants within such a treatment is little. Therefore, we investigated the fate of the UV filters ethylhexyl methoxycinnamate (EHMC), and octocrylene (OCR) as for both UV filters the presence in grey water was reported. OCR as a single compound was investigated with regard to its degradation kinetics and possible photo-transformation products (photo-TPs). These results were compared with those of EHMC previously reported in literature. The mixture of the two UV filters was also investigated to reveal if mixture effects occur regarding the elimination of the UV filters and the formation of TPs. A medium pressure mercury vapor lamp (200-400 nm) was employed for photolysis. This study shows that OCR itself was eliminated below the limit of detection after 256 min and that photo-TPs were formed. The photolysis of the mixture demonstrated alterations of the degradation rates and patterns. Additional TPs were formed by the reaction of the UV filters or TPs with each other. The study shows that more attention should be paid to mixture-effects and mixture-TPs that may cause further follow-up effects. © 2019 Elsevier B.V. All rights reserved.
In recent years, more and more countries see irrigation using reclaimed water as an opportunity to secure and enhance agricultural production. Despite the benefits of water reuse, the scientific community raised several concerns and challenges for human health and the environment. This includes chemical risks. Effluents from urban wastewater treatment plants usually contain a wide range of organic chemicals. Such chemicals remaining in the water after the treatment process may cause hazards for human health, contaminate surrounding soil and water resources, and even compromise drinking water sources. Once crops on irrigated sites are exposed to chemicals, the potential transport to and accumulation in the edible parts of fruits and vegetables need to be controlled to rule out their introduction into the food chain. Finally, problems concerning the release of wastewater-borne antibiotics into the environment are starting to gain attention. For these reasons, agricultural irrigation should face more stringent quality requirements in order to minimize chemical risks. Combinations of measures reducing chemicals at the source, technical and natural water treatment processes especially to remove chemicals with persistent, bioaccumulative and toxic (PBT), or persistent, mobile and toxic (PMT) properties, good agricultural practices, and supplementary preventive measures (e.g. knowledge transfer to the stakeholders involved) will be necessary to bring about and ensure safe irrigation in the future. While internationally many regulations and guidelines for water reuse have successfully been implemented, questions remain whether the current knowledge regarding chemical risks is sufficiently considered in the regulatory context. The introduction of a new regulation for water reuse, as attempted in the European Union, poses a good opportunity to better take chemicals risks into account. Quelle: https://link.springer.com
Das Umweltbundesamt (UBA)-Projekt „Auswirkung des Klimawandels auf die Wasserverfügbarkeit - Anpassung an Trockenheit und Dürre in Deutschland“ (WADKlim) erforscht die Auswirkungen von Trockenheit und Dürre auf das Wasserdargebot, den Bodenwasserhaushalt und die Grundwasserverfügbarkeit in Deutschland. Das Projekt schafft einen Überblick über die gegenwärtige Wasserverfügbarkeit in Deutschland, sowie deren zukünftigen Entwicklung unter Klimawandelbedingungen. Weiterhin analysiert das Vorhaben aktuelle und zukünftige Wassernutzungskonflikte in Deutschland und entwickelt Lösungsstrategien und Maßnahmen, die zum vorausschauenden Umgang und zur Vermeidung von Nutzungskonflikten beitragen können. Zudem werden die Möglichkeiten, Chancen und Risiken der Wasserwiederverwendung zur Bewässerung im urbanen Raum dargestellt und bewertet.
In recent years, more and more countries see irrigation using reclaimed water as an opportunity to secure and enhance agricultural production. Despite the benefits of water reuse, the scientific community raised several concerns and challenges for human health and the environment. This includes chemical risks. Effluents from urban wastewater treatment plants usually contain a wide range of organic chemicals. Such chemicals remaining in the water after the treatment process may cause hazards for human health, contaminate surrounding soil and water resources, and even compromise drinking water sources. Once crops on irrigated sites are exposed to chemicals, the potential transport to and accumulation in the edible parts of fruits and vegetables need to be controlled to rule out their introduction into the food chain. Finally, problems concerning the release of wastewater-borne antibiotics into the environment are starting to gain attention. For these reasons, agricultural irrigation should face more stringent quality requirements in order to minimize chemical risks. Combinations of measures reducing chemicals at the source, technical and natural water treatment processes especially to remove chemicals with persistent, bioaccumulative and toxic (PBT), or persistent, mobile and toxic (PMT) properties, good agricultural practices, and supplementary preventive measures (e.g. knowledge transfer to the stakeholders involved) will be necessary to bring about and ensure safe irrigation in the future. While internationally many regulations and guidelines for water reuse have successfully been implemented, questions remain whether the current knowledge regarding chemical risks is sufficiently considered in the regulatory context. The introduction of a new regulation for water reuse, as attempted in the European Union, poses a good opportunity to better take chemicals risks into account. © The Author(s) 2020
High nitrate concentrations in wastewater treatment plant effluents and aquifers can challenge sequential biofiltration systems in preventing nitrite and gas formation in the sand bed, as well as to achieve the regulated limit value for nitrate in potable water reuse applications. This study investigates the introduction of electron donors in the form of organic fixed bed materials as an in-situ anoxic zone into sequential biofiltration systems. Laboratory batch and column tests with straw, soft wood, peat, polylactic acid (PLA), and polycaprolacton (PCL) revealed incomplete denitrification with a hydraulic retention time below 10 h, high organic carbon leaching, especially during the first three months, and gas accumulation within the filter bed. Therefore, ex-situ denitrification prior to oxic biofilters or in a defined side-stream treatment is recommended. No enhanced transformation of trace organic chemicals was observed under nitrate reducing conditions. Peat revealed a sorption potential for 5-methyl-benzotriazole, carbamazepine, benzotriazole, and metoprolol. © 2020 The Authors
| Origin | Count |
|---|---|
| Bund | 945 |
| Land | 4 |
| Type | Count |
|---|---|
| Förderprogramm | 919 |
| Text | 18 |
| Umweltprüfung | 1 |
| unbekannt | 10 |
| License | Count |
|---|---|
| geschlossen | 32 |
| offen | 915 |
| unbekannt | 1 |
| Language | Count |
|---|---|
| Deutsch | 940 |
| Englisch | 108 |
| unbekannt | 1 |
| Resource type | Count |
|---|---|
| Datei | 2 |
| Dokument | 11 |
| Keine | 562 |
| Webseite | 379 |
| Topic | Count |
|---|---|
| Boden | 728 |
| Lebewesen & Lebensräume | 704 |
| Luft | 487 |
| Mensch & Umwelt | 948 |
| Wasser | 923 |
| Weitere | 947 |