Forum für Wissenschaft, Industrie und Wirtschaft

Hauptsponsoren:     3M 
Datenbankrecherche:

 

Sewage lagoons remove most - but not all - pharmaceuticals

15.02.2013
2012 marked the 40th anniversary of the Clean Water Act, which established regulations for the discharge of pollutants to waterways and supported the building of sewage treatment plants. Despite these advances, sewage remains a major source of pharmaceuticals and personal care products (PPCPs) and naturally occurring hormones found in the environment.

Many rural communities in the United States use aerated lagoon systems to treat their wastewater. The wastewater is pumped into at least one manmade aerated lagoon, in which oxygen-loving and anaerobic microorganisms remove many of the contaminants. The water is then pumped into a series of other lagoons. Finally, the resulting water, known as the effluent, is discharged directly into a receiving stream.

The drugs, chemicals and hormone contaminants such as ibuprofen, caffeine and ethinyl estradiol from urban sewage treatment plants have been studied and monitored widely, but their occurrence in rural lagoon treatment systems is often overlooked.

In a new study led by Wei Zheng, a senior research scientist at the Illinois Sustainable Technology Center and an adjunct faculty member in the University of Illinois department of natural resources and environmental sciences, researchers determined the effectiveness of rural lagoon systems at removing these compounds from wastewater. The research was conducted jointly with the Illinois State Water Survey. The study appears in the journal Science of the Total Environment.

Scientists collected water samples in September and November from a rural wastewater treatment plant located in a small town in Illinois. The facility treats sewage wastewater in two aerated lagoons, using a sand tank for filtration. The effluent streams into a creek that flows into the Mackinaw River. The researchers collected samples from various steps during the treatment process for analysis.

The researchers then tested the samples for the presence of 21 commonly used PPCPs and hormones, including caffeine and ibuprofen.

The team found that the lagoon treatment system reduced concentrations of most of the tested compounds. The overall removal efficiency ranged from 88 to 100 percent in September, except for the compound carbamazepine, a drug used for the treatment of epilepsy and bipolar disorder that is notoriously difficult to remove from wastewater. There were no detectable steroid hormones in the aerated lagoons and effluent.

Interestingly, the samples collected in November contained higher concentrations of all detected PPCPs than the samples collected in September. According to Zheng, this is most likely because the microorganisms that break down the compounds work best in warm weather.

Although the efficiency of rural sewage treatment lagoons is relatively high, this study shows that there is a significant increase in the occurrence of PPCPs in surrounding watersheds with the effluent discharge, which could change the rural aquatic environment.

“Some compounds are easy to degrade and remove using this lagoon treatment system, but some compounds are persistent,” Zheng said. “When these persistent compounds are introduced into the environment through effluent discharge, they may contaminate water sources and affect the watershed ecosystem.”

Because people eventually consume this water, the presence of PPCPs and steroid hormones is a concern, Zheng said.

“Pharmaceutical residues are usually detected in the aquatic environment at very low concentrations, below their therapeutic doses employed for medical purposes,” he said. “However, long-term chronic exposure to these emerging contaminants in water supplies may jeopardize human and aquatic habitat health.”

The research also is useful for addressing the potential risks of using rural sewage effluent for crop irrigation, especially as the occurrence of droughts increases, Zheng said.

More research needs to be conducted to understand the environmental fate and negative effects of PPCP and hormone contaminants, but for now, Zheng is happy that the information he and his team found will benefit rural communities to properly utilize lagoon treatment systems to handle their wastewater and help state and federal agencies formulate prudent regulatory programs on agricultural irrigation of rural sewage effluents.

“The (federal Environmental Protection Agency) doesn’t have regulations or management strategies for controlling PPCP and hormone contaminants released from sewage effluents, so our information can raise the public’s attention, help the EPA develop the best management strategies and thereby minimize the loading of these emerging contaminants into the environment and promote the safe and beneficial reuse of treated wastewater in U.S. agriculture,” Zheng said.

The Illinois Sustainable Technology Center is part of the Prairie Research Institute at the U. of I.

Chelsey Coombs | University of Illinois
Further information:
http://www.illinois.edu

More articles from Ecology, The Environment and Conservation:

nachricht Northern bald ibises fit for their journey to Tuscany
21.08.2015 | Veterinärmedizinische Universität Wien

nachricht Boreal forests challenged by global change
21.08.2015 | International Institute for Applied Systems Analysis (IIASA)

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: OU astrophysicist and collaborators find supermassive black holes in quasar nearest Earth

A University of Oklahoma astrophysicist and his Chinese collaborator have found two supermassive black holes in Markarian 231, the nearest quasar to Earth, using observations from NASA's Hubble Space Telescope.

The discovery of two supermassive black holes--one larger one and a second, smaller one--are evidence of a binary black hole and suggests that supermassive...

Im Focus: Optische Schalter - Lernen mit Licht

Einem deutsch-französischen Team ist es gelungen, einen lichtempfindlichen Schalter für Nervenzellen zu entwickeln. Dies ermöglicht neue Einblicke in die Funktionsweise von Gedächtnis und Lernen, aber auch in die Entstehung von Krankheiten.

Lernen ist nur möglich, weil die Verknüpfungen zwischen den Nervenzellen im Gehirn fortwährend umgebaut werden: Je häufiger bestimmte Reizübertragungswege...

Im Focus: What would a tsunami in the Mediterranean look like?

A team of European researchers have developed a model to simulate the impact of tsunamis generated by earthquakes and applied it to the Eastern Mediterranean. The results show how tsunami waves could hit and inundate coastal areas in southern Italy and Greece. The study is published today (27 August) in Ocean Science, an open access journal of the European Geosciences Union (EGU).

Though not as frequent as in the Pacific and Indian oceans, tsunamis also occur in the Mediterranean, mainly due to earthquakes generated when the African...

Im Focus: Membranprotein in Bern erstmals entschlüsselt

Dreidimensionale (3D) Atommodelle von Proteinen sind wichtig, um deren Funktion zu verstehen. Dies ermöglicht unter anderem die Entwicklung neuer Therapieansätze für Krankheiten. Berner Strukturbiologen ist es nun gelungen, die Struktur eines wichtigen Membranproteins zu entschlüsseln – dies gelingt relativ selten und ist eine Premiere in Bern.

Membranproteine befinden sich in den Wänden der Zellen, den Zellmembranen, und nehmen im menschlichen Körper lebenswichtige Funktionen wahr. Zu ihnen gehören...

Im Focus: Quantenbeugung an einem Hauch von Nichts

Die Quantenphysik besagt, dass sich auch massive Objekte wie Wellen verhalten und scheinbar an vielen Orten zugleich sein können. Dieses Phänomen kann nachgewiesen werden, indem man diese Materiewellen an einem Gitter beugt. Eine europäische Kollaboration hat nun erstmals die Delokalisation von massiven Molekülen an einem Gitter nachgewiesen, das nur noch eine einzige Atomlage dick ist. Dieses Experiment lotete die technischen Grenzen der Materiewellentechnologie aus und knüpft dabei an ein Gedankenexperiment von Bohr und Einstein an. Die Ergebnisse werden aktuell im Journal "Nature Nanotechnology" veröffentlicht.

Die quantenmechanische Wellennatur der Materie ist die Grundlage für viele moderne Technologien, wie z. B. die höchstauflösende Elektronenmikroskopie, die...

Alle Focus-News des Innovations-reports >>>

Anzeige

Anzeige

IHR
JOB & KARRIERE
SERVICE
im innovations-report
in Kooperation mit academics
Veranstaltungen

Gravitationswellen im Einsteinjahr

28.08.2015 | Veranstaltungen

Strömungen in industriellen Anlagen sichtbar gemacht

28.08.2015 | Veranstaltungen

Konzepte gegen Fachkräftemangel: Demografiekonferenz in Halle

27.08.2015 | Veranstaltungen

 
B2B-VideoLinks
Weitere VideoLinks >>>
Aktuelle Beiträge

Siemens an der Sicherheit: Lösungen für jede Anforderung

28.08.2015 | Messenachrichten

Biofabrikation von künstlichen Blutgefäßen mit Laserlicht

28.08.2015 | Biowissenschaften Chemie

Forscher entwickeln Methode zur Manipulation von Molekülen

28.08.2015 | Physik Astronomie