Navigation Links
Device traps, disables harmful bacteria

A team of engineers from Washington University in St. Louis and the University of Colorado at Boulder has removed bioaerosols -- airborne biological particulate matter -- from the air of a hospital therapy pool using a new generation of hybrid filters.

The bioaerosols identified in the unnamed Midwestern hospital pool had sickened nine lifeguards who had become ill with hypersensitivity pneumonitis, a lung condition that mimics pneumonia symptoms. This forced the pool to shut down. It is now reopened.

Lars T. Angenent, Ph.D., Washington University assistant professor of chemical engineering, and the Colorado engineers mounted three high-efficiency particulate air (HEPA) ultraviolet (UV) air filters on the ceiling of the pool room. They compared concentrations of total bacteria, culturable bacteria and airborne endotoxin -- a poison present in gram-negative bacterial cell walls that can cause severe inflammatory responses -- with and without the air filters operating under similar conditions. They compared the performance of the filters twice, one year apart, and found that the filters reduced concentrations of culturable bacteria by 69 and 80 percent during monitoring periods executed in respective years. The filters reduced concentrations of total bacteria by 12 and 76 percent, respectively, over the same span. But the filters did not affect airborne endotoxin concentrations.

"This specific filter has a blower that takes a high volume of air and puts it through a filter that screens bacteria and even smaller particles," said Angenent, a member of Washington University's Environmental Engineering Science Program. " And after the filter there is UV light; if something passes through the filter, the UV zaps it. It's a combination approach that appears very effective. The bacterium that had been causing illness was Mycobacterium avium, which can make immunocompromised people ill, and since a lot of elderly use therapy pools, that's a concern. How ever, since using the filters, no one has gotten sick."

The researchers also tested the hybrid filters in an environmentally controlled laboratory chamber to come up with the air-exchange rate for the therapy pool assays, among other parameters.

The researchers published their results in the Feb. 2005 issue of the Journal of Air & Waste Management Association. The study was supported by funds and equipment provided by Honeywell, Inc., UlraViolet Devices, Inc., and the National Science Foundation.

Angenent's collaborators are: Elmira Kujundicz, David A. Zander, and Mark Hernandez, of the University of Colorado Department of Civil, Environmental, and Architectural Engineering; and David E. Henderson and Shelly L. Miller, of the Department of Mechanical Engineering, University of Colorado.

Bioaerosols pose a threat to public health through infectious and toxic diseases. Today there are increased settings where people gather and can be affected by such bioaerosols. Among these "high-exposure environments" are correctional facilities, homeless shelters, healthcare facilities, and public transit systems. Additionally, the advent of hot tubs, hospital therapy pools and other warm-water leisure and therapy pools, many bioaerosols researchers believe, creates harbors that enhance the aerosolization of microorganisms, including strains of Legionella and Mycobacterium, that can cause diseases such as "lifeguard lung."

"The results of this study suggest that a reasonable reduction in bioaerosol concentrations can be achieved by installing this new generation of hybrid air filters," the authors conclude. "Engineering control methods must be balanced with constraints such as occupant comfort, economic factors, and building management strategies to ensure that the health risks associated with bioaerosol exposure are as low as practical."


Source:Washington University in St. Louis

Related biology news :

1. Implanted Devices Detect High-Risk Heart Failure Patients
2. Team Invents Device For Weighing Individual Molecules
3. Device effective in zapping the pain out of migraines
4. Studies reveal how plague disables immune system, and how to exploit the process to make a vaccine
5. How HIV disables the cells call for help
6. HIV accessory protein disables host immunity via receptor-protein intermediary
7. Scientists ID molecular switch in liver that triggers harmful effects of saturated and trans fats
8. Health of Acehnese reefs in the wake of the tsunami shows human impacts more harmful
9. UCSD study finds anthrax toxins also harmful to fruit flies
10. DNA gene vaccine protects against harmful protein of Alzheimers disease
11. Biobullets fight harmful mussels
Post Your Comments:

(Date:11/9/2015)... 2015  Synaptics Inc. (NASDAQ: SYNA ), the ... entry into the automotive market with a comprehensive and ... of consumer electronics human interface innovation. Synaptics, industry-leading touch ... the automotive industry and will be implemented in numerous ... , Japan , and ...
(Date:10/29/2015)... , Oct. 29, 2015 Daon, a global ... it has released a new version of its ... North America have already installed ... also includes a FIDO UAF certified server component ... preparing to activate FIDO features. These customers include some ...
(Date:10/27/2015)... Oct. 27, 2015 In the present market ... concern for various industry verticals such as banking, healthcare, ... the growing demand for secure & simplified access control ... such as hacking of bank accounts, misuse of users, ... such as PC,s, laptops, and smartphones are expected to ...
Breaking Biology News(10 mins):
(Date:11/30/2015)... 30, 2015  AbbVie, is introducing Good Morning ... a daily routine for managing the life-long condition of ... affect the way the body absorbs it so resources ... daily routine are important. The goal of the new ... manage their hypothyroidism by establishing a daily routine, spirit ...
(Date:11/30/2015)... , Nov. 30, 2015  Northwest Biotherapeutics (NASDAQ: ... developing DCVax® personalized immune therapies for solid tumor cancers, ... an additional independent director, and the Company welcomes ... allegations in a recent anonymous internet report on NW ... initiatives. Linda Powers stated, "We agree ...
(Date:11/30/2015)... N.J. and PETACH TIKVAH, Israel ... (NASDAQ: BCLI ), a leading developer of adult ... wholly-owned subsidiary, Brainstorm Cell Therapeutics Ltd., has been awarded an ... Office of the Chief Scientist (OCS). This grant, the ... Brainstorm for 2015 activities to approximately $1.8 million (approximately NIS7 ...
(Date:11/27/2015)... 2015 /PRNewswire/--  Mallinckrodt plc (NYSE: MNK ), ... has closed the sale of its global contrast media ... Euronext) in a transaction valued at approximately $270 million. ... a total of approximately 1,000 employees spread across the ... Louis area. This entire workforce and the ...
Breaking Biology Technology: