Navigation Links
New tech removes air pollutants, may reduce energy use in animal ag facilities
Date:1/4/2012

Researchers from North Carolina State University and West Virginia University have developed a new technology that can reduce air pollutant emissions from some chicken and swine barns, and also reduce their energy use by recovering and possibly generating heat.

Specifically, the research team designed, built, and evaluated a proof-of-concept unit that incorporates a biofilter and a heat exchanger to reduce ammonia emissions from livestock barns, while also tempering or heating up the fresh air that is pumped into the barns.

The pollution removal component utilizes a biofiltration mechanism, in which polluted air is passed through an organic medium, such as compost or wood chips, that contains bacteria. Those bacteria interact with the pollutants and break them down into harmless or less harmful constituents. Biofiltration also allows recycling of nitrogen because when the "spent" medium is applied on cropland, the nitrogen becomes available to the crops. However, biofiltration also introduces additional costs for animal agriculture operations. The researchers hope to defray those costs by reducing an operation's energy consumption.

Here's how their prototype works: warm, polluted air from the livestock facility enters the biofilter, and some of the heat is transferred to the heat exchanger. When fresh air from outside is pumped into the building, it passes over the heat exchanger, warming it up.

The prototype not only helps recover heat from the facility, it also produces its own heat. This heat is generated within the biofilter when heat-producing biochemical reactions occur for example, when the ammonia is converted into nitrate by bacteria. The heat from the biofilter is also routed to the heat exchanger.

Maintaining the appropriately high temperature is important for chicken and swine operations, because it is essential for rearing chicks and piglets to maturity.

"The technology is best suited for use when an operation wants to vent a facility that has high ammonia concentrations, and pump in cleaner air in preparation for a fresh batch of chicks or piglets particularly in cold weather. It is also suitable for use when supplemental heat is required for raising the young animals," says Dr. Sanjay Shah, an associate professor of biological and agricultural engineering at NC State and lead author of a paper describing the research. For this to be feasible, it would be necessary to replace a couple of the conventional cold weather ventilation fans with higher-pressure fans. Shah explains that the technology is not compatible with summer ventilation using tunnel-fans, because of the high cost and choking effect on the fans.

Shah says the researchers focused on ammonia removal because: it is released from chicken and swine houses in large quantities; it contributes to nutrient loading problems such as hypoxia; it is an indirect contributor to greenhouse gases (GHGs) because it can break down in to the potent GHG nitrous oxide in the ground; and because it is a precursor to very fine particulate matter, which contributes to haze and public health problems, such as asthma.

Researchers showed that their design is effective under real-world conditions, operating their prototype in a 5,000-bird chicken house. The prototype removed up to 79 percent of ammonia and reduced the energy needed to maintain the necessary temperature in the facility recovering as much as 8.3 kilowatts of heat.

"We plan to continue working to improve the system design in order to make it even more efficient," Shah says.


'/>"/>
Contact: Matt Shipman
matt_shipman@ncsu.edu
919-515-6386
North Carolina State University
Source:Eurekalert

Related biology news :

1. Novel device removes heavy metals from water
2. Artificial enzyme removes natural poison
3. Gene-based stem cell therapy specifically removes cell receptor that attracts HIV
4. IAEA removes dangerous radioactive sources from Lebanon
5. Hydrogen sulfide reduces glucose-induced injury in kidney cells
6. Researchers discover a way to significantly reduce the production costs of fuel cells
7. 3-year study identifies key interventions to reduce maternal, newborn and child deaths
8. Benefits abound with recently patented system that reduces phosphorus in wastewater
9. Neiker-Tecnalia sets up a mobile laboratory to reduce the environmental impact of farms
10. Eating fish reduces risk of Alzheimers disease
11. Reduced bone density, stunted growth in turtles exposed to common chemical
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/1/2016)... ( www.wocketwallet.com ) announces the launch of a new video featuring singer, ... Las Vegas , where Joey appeared at the Wocket booth to ... , where Joey appeared at the Wocket booth to meet and greet ... the Consumer Electronics Show (CES2016) in Las Vegas , ... --> --> The video is ...
(Date:1/25/2016)... , Jan. 25, 2016   Unisys Corporation (NYSE: ... at John F. Kennedy (JFK) International Airport, New York ... (CBP) identify imposters attempting to enter the United ... belong to them. pilot testing of the system ... at three terminals at JFK during January 2016. --> ...
(Date:1/22/2016)... Jan. 22, 2016 ... of the "Global Biometrics Market in ... offering. --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) ... "Global Biometrics Market in Retail Sector 2016-2020" ... --> Research and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ...
Breaking Biology News(10 mins):
(Date:2/11/2016)... 11, 2016  Neurocrine Biosciences, Inc. (NASDAQ: NBIX ) today ... 31, 2015. --> --> ... loss of $29.3 million, or $0.34 loss per share, compared to ... for the same period in 2014. For the year ended December ... or $1.05 loss per share, as compared to a net loss ...
(Date:2/11/2016)...  Spectra BioPharma Selling Solutions (Spectra) is a ... companies the experience, expertise, operational delivery and customer ... teams. Created in concert with industry leading commercial ... and tactical needs of its clients by providing ... personal and non-personal promotion. --> ...
(Date:2/11/2016)... February 11, 2016 ... or "Company") (OTCQB: PSID), a life sciences company ... its Thermomedics subsidiary, which markets the Caregiver® FDA-cleared ... plan in January 2016, including entering into agreements ... monthly sales growth, and establishing several near-term pipeline ...
(Date:2/11/2016)... ... 2016 , ... Global Stem Cells Group, has ... The new facility will provide advanced protocols and state-of-the-art techniques in cellular medicine, ... , The new GSCG clinic is headed by four prominent Ecuadorian physicians, including ...
Breaking Biology Technology: