Navigation Links
New way of removing excess nitrogen from the environment
Date:11/1/2010

Excess nitrogen from agricultural and urban lands is contaminating groundwater, streams, lakes and estuaries, where it causes harmful algal blooms and contributes to fish kills.

Cost-effective approaches to removing this nitrogen from croplands and urban stormwater runoff before it reaches sensitive water bodies have been elusive.

But simple and inexpensive technologies are on the horizon. A recent scientific workshop on denitrification brought together ecologists, engineers and policy experts to find answers.

Denitrification is a biological process carried out by soil and aquatic microorganisms, in which forms of reactive nitrogen are converted to unreactive and harmless dinitrogen gas.

Findings from the workshop, held in May, 2009, at the University of Rhode Island, are published in the November, 2010, special issue of the scientific journal Ecological Engineering.

The workshop was sponsored by the National Science Foundation (NSF)'s Denitrification Research Coordination Network (RCN), established to enhance collaboration among researchers investigating denitrification.

"This special issue of Ecological Engineering, with its focus on managing denitrification in human-dominated landscapes, highlights our need to understand Earth's microorganisms and their processes," says Matt Kane, program director in NSF's Division of Environmental Biology, which funded the RCN and the workshop.

"The RCN brought together an international and interdisciplinary group of scientists and engineers to synthesize the knowledge necessary to provide pure water for generations to come."

At the workshop, more than 40 participants combined their expertise to address the goal of using ecological principles in engineering design to control nitrogen pollution.

One workshop goal was to evaluate a new and relatively inexpensive way to treat wastewater and drainage from agricultural lands using "denitrifying bioreactors."

These bioreactors use common waste products, such as wood chips, to provide a food source for naturally occurring microorganisms. The microbes convert dissolved nitrogen into harmless nitrogen gas, which is then released to the atmosphere.

Research results in Ecological Engineering are reported from New Zealand, Canada and several locations in the United States.

All confirm that denitrifying bioreactors may be used in many settings, and operate well in a range of temperatures.

The systems have been successful in the cleanup of domestic effluent from small townships, septic tank systems and wastes from dairy farms, says Louis Schipper of the University of Waikato, New Zealand, author of the lead paper in the journal.

"Denitrifying bioreactors have been integrated into agricultural fields," adds Eric Davidson of The Woods Hole Research Center in Falmouth, Mass., and co-author of the journal's lead paper.

"Underground drainage pipes there remove excess water that contains excess nitrogen. By intercepting some of this drainage water, direct inputs of nitrate to surface water can be reduced."

The largest bioreactor tested, by Schipper and colleagues Stewart Cameron and Soren Warneke at the University of Waikato, is 200 meters long by five meters wide by two meters deep. It treats effluent from greenhouse-grown tomatoes.

Research led by Will Robertson of the University of Waterloo found that bioreactors may operate for more than a decade without replacement of wood chips or substantive maintenance.

Similar longevity was confirmed in research in Iowa by Tom Moorman of the USDA-Agricultural Research Service.

Studies by D.Q. Kellogg and Art Gold of the University of Rhode Island demonstrate that recent advances in geospatial data--such as computer-based maps of geologic and land-use patterns--provide a decision-support tool for local regulatory and planning agencies.

These advances, Kellogg and Gold say, will help reduce nitrate-loading to downstream waters.

A study conducted at the University of California at Davis by Harold Leverenz and reported in the journal showed that plants may be grown on the surface of denitrifying bioreactors, providing biodiversity benefits.

"Research presented in this special issue of Ecological Engineering goes a long way toward applying a scientific understanding of the biological processes of denitrification to the engineering challenges of denitrifying bioreactors," says Davidson.

"The resulting guidelines and principles for denitrifying bioreactor design and operation are an additional option in the land manager's tool box."


'/>"/>

Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-7734
National Science Foundation
Source:Eurekalert

Related biology news :

1. An easy way to find a needle in a haystack by removing the haystack
2. Succimer found ineffective for removing mercury
3. Low sperm count may be associated with prenatal testosterone excess
4. Diatom genome helps explain success in trapping excess carbon in oceans
5. Study: Excessive use of antiviral drugs could aid deadly flu
6. UTMB study identifies women at risk of gaining excessive weight with injectable birth control
7. New study finds way to stop excessive bone growth following trauma or surgery
8. Excess DNA damage found in cells of patients with Friedreichs ataxia
9. Anorexics found to have excess fat-- in their bone marrow
10. Community interventions and in-home visits may slow excess weight gain in American Indian children
11. Nitrogen applied
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/24/2017)... 2017 Janice Kephart , former ... Strategy Partners, LLP (IdSP) , today issues the ... Trump,s March 6, 2017 Executive Order: Protecting ... can be instilled with greater confidence, enabling the ... refugee applications are suspended by until at least ...
(Date:4/13/2017)... 2017 According to a new market research report ... Identity Administration, and Authorization), Service, Authentication Type, Deployment Mode, Vertical, and Region ... expected to grow from USD 14.30 Billion in 2017 to USD 31.75 ... ... MarketsandMarkets Logo ...
(Date:4/6/2017)... Forecasts by Product Type (EAC), Biometrics, Card-Based ... & Logistics, Government & Public Sector, Utilities / Energy ... Nuclear Power), Industrial, Retail, Business Organisation (BFSI), Hospitality & ... for a definitive report on the $27.9bn Access Control ... ...
Breaking Biology News(10 mins):
(Date:9/22/2017)... ... 2017 , ... HOLLOWAY AMERICA, a stainless steel pressure vessel ... PACK EXPO International in Las Vegas from September 25 to 27. The annual ... year’s PACK EXPO at the Last Vegas Convention Center, HOLLOWAY representatives will be ...
(Date:9/22/2017)... , ... September 22, 2017 , ... ... leg ulcers is now being assessed in clinical trials in the United States. ... talk to your nurse or physician or find your nearest participating clinic here ...
(Date:9/21/2017)... , ... (PRWEB) September 21, 2017 , ... ... international scientific and technical congress to review the latest knowledge on these products, ... prestigious international speakers will discuss the impact of Biostimulants on Plant Nutrition, Abiotic ...
(Date:9/21/2017)... ... September 21, 2017 , ... Today, BioPharma ... has announced the addition of 5 new courses to its prospectus. These include ... Regulation 21 CFR Part 11 on Electronic Records and Electronic Signatures (Part 11 ...
Breaking Biology Technology: