Navigation Links
Biofilters reduce carbon footprint of old landfill sites
Date:7/11/2011

Researchers in the US are testing biofilter systems as a viable alternative to releasing methane from passive landfill vents into the atmosphere. The technology could reduce the overall impact of old landfills on global warming. Details are reported in the current issue of the International Journal of Environmental Engineering.

Organic matter rotting in smaller, old landfill sites generates a slow trickle of the potent greenhouse gas, methane, into the atmosphere, amounting to just 2 or 3 kilograms per day per vent. In contrast to controlled methane generate for biofuel from modern, managed landfills, tapping this slow stream of the gas is not viable technologically or economically. However, methane has an infrared activity 21 times greater than carbon dioxide and so represents an important anthropogenic source of this greenhouse gas when attempting to balance the climate change books. Indeed, landfills contribute 12% of worldwide anthropogenic methane emissions due to the decomposition of organic waste.

Old landfills typically have passive gas vents. Methane is simply released into the atmosphere from these vents, or if the rate of emission is high enough it can be burned, or flared. According to Tarek Abichou and Jeffery Chanton of the Florida State University, Jose Morales of Environmental and Geotechnical Specialists, Inc., Tallahassee, Florida and Lei Yuan of Geosyntec Consultants in Columbia, Maryland, methane oxidation has recently been viewed as a more benign alternative to venting or flaring of landfill methane.

The researchers tested two biofilter designs capable of oxidizing methane gas to carbon dioxide and water. Both are packed with so-called methanotrophic bacteria, microbes that digest methane. They found that the radial biofilter design gave a much higher methane oxidation rate than a vertical biofilter. The higher surface area exposed to methane flow led to greater oxygen penetration into the biofilters, essential for microbial digestion. The radial biofilter has a surface area of well over 1.2 square meters whereas the vertical biofilter amounts to just 0.3 square meters area.

The team also found that the average percent oxidation rate of 20% and higher for the radial biofilter was possible when the air temperature was 20 to 36 Celsius, indicating the optimal soil temperature for methanotrophic bacteria to oxidize methane. Vertical biofilters averaged a little over 12% oxidation.


'/>"/>

Contact: Lei Yuan
lyuan@geosyntec.com
Inderscience Publishers
Source:Eurekalert

Related biology news :

1. Study: Preventive use of one form of natural vitamin E may reduce stroke damage
2. Folate intake may reduce colorectal cancer risk
3. Twin-head cucumber system reduces start-up costs
4. Popeyes Restaurant Franchisee Uses DigitalPersona Fingerprint Biometrics to Reduce Employee Fraud
5. IOF calls for improved strategies to close the treatment gap and reduce future burden of fractures
6. Low-carbohydrate, high-protein diets may reduce both tumor growth rates and cancer risk
7. B vitamins in mothers diet reduce colorectal cancer risk in offspring
8. Protein could offer target to reduce lung damage from smoking-caused emphysema
9. New strategy aims to reduce agricultural ammonia
10. Ozone reduces fungal spoilage of fruits and vegetables
11. Nanopolymer shows promise for helping reduce cancer side effects
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/10/2016)... March 10, 2016 --> ... research report "Identity and Access Management Market by Component ... and Governance), by Organization Size, by Deployment, by Vertical, ... by MarketsandMarkets, The market is estimated to grow from ... by 2020, at a Compound Annual Growth Rate (CAGR) ...
(Date:3/9/2016)... March 9, 2016  Crossmatch ® , a ... solutions, today announced the addition of smart features ... multi-factor authentication platform. New contextual and application-specific ... step-up security where it,s needed most — while ... DC . --> Washington, ...
(Date:3/3/2016)... and DE SOTO, Kansas ... U.S.-based Stroke Detection Plus® to offer Oncimmune,s Early ... assessment and early detection of lung cancer ... employers, unions and individuals. --> Early CDT®-Lung ... and individuals. --> Oncimmune, a leader in ...
Breaking Biology News(10 mins):
(Date:5/3/2016)... ... 2016 , ... Leading CEOs from biotech, pharmaceutical, and healthcare ... 1st at The Four Seasons Hotel Boston. , The Boston CEO Conference is ... access to key decision makers who influence deal making and investment. Attendees gain ...
(Date:5/3/2016)... ... May 03, 2016 , ... ... , the sensor and data driven conferences, will take place on June 7-8, 2016, at the ... UnitedHealth's Vidya Raman-Tangella on incorporating technology -- including AR/VR, machine learning, apps, robotics and ...
(Date:5/3/2016)... ... 03, 2016 , ... According to world renowned prostate cancer surgeon, Dr. ... traditionally had two main treatment options: surgery or radiation. Based on a patient’s goals, ... technology has enabled doctors to administer higher doses of radiation to prostate ...
(Date:5/2/2016)... ... 02, 2016 , ... Meister Media Worldwide launches its new ... added functionality give the agricultural world a taste of Meister Media Worldwide’s full ... – from precision farming via satellites and Unmanned Aerial Vehicles (UAVs) to indoor ...
Breaking Biology Technology: