1,720,974 research outputs found
Antimicrobial efficacy and longevity of silver+zeolite incorporating preinsulated ducts installed in real healthcare settings.
No full textThe values of microbial growth in the air exiting from the heating, ventilation and air conditioning (HVAC) ducts treated with silver/zeolite have been shown to be lower than those in the air coming out the traditional metal ones. This study aims to verify how long this antimicrobial activity lasts.All the tests were performed according to US ASTM E2180-01 and ISO-JIZ 22196 standards. Samples of aluminum cladding panels of different thickness and incorporating silver-zeolite were tested in order to verify their thickness depending antibacterial activity. The same kind of linings samples were analyzed after a simulated and accelerated ageing process. Ag-zeolite incorporating HVAC duct panels linings were tested after years from their installation, in order to verify the maintenance of their bactericidal power during time.For laminates containing different amounts of silver+Zeolite it was shown that also in panels with minimum thickness tested, the lowest germicidal effect (GE) found was still very good (GE of 5,76 ULog10). After their wearing and tearing the antimicrobial activity tended to increase passing from 7.2081 to 8.29922 LogUnits in panels 80 microns thick. For still hospital working aluminium foils incorporating Silver/Zeolite on panels installed through 2006 and 2008, the antimicrobial action of zeolite was still firmly present even after two years and three years.The germicidal effect standards were maintained even during time on constant values between 7.477 and 7.086 LogUnits. The persistence of bactericidal efficacy of Ag+zeolite treatment in all the materials used for the construction of HVAC ductworks can be confirmed
Contaminazione da Legionella pneumophila della rete idrica ospedaliera e risposta ai più comuni metodi di contaminazione : Shock termico e iperclorazione
No full textAmbedue i sistemi di bonifica risolvevano il problema della presenza di L.pneumophila in una rete idrica ospedaliera per non più di 30gg e quindi il trattamento usato doveva essere ripetut
Casi di legionellosi in Liguria notificati presso il Laboratorio del Centro di Riferimento Regionale nel 2005.
No full textSorveglianza ambientale per la ricerca di Legionella nell’impianto idrico di alcuni reparti ospedalieri.
No full textPresenza di L.pneumophila in riuniti odontoiatrici: risultati di un biennio di attività nella Provincia di Genova
No full textCasi di legionellosi notificati presso il laboratorio del centro di riferimento regionale nel triennio 2007-2008-2009
No full textCasi di legionellosi in Liguria notificati presso il laboratorio del centro di riferimento regionale nel triennio 2007-2008-2009
No full textCorrelation between Legionella contamination in water and surrounding air
No full textWe evaluated Legionella pneumophila contamination of water and surrounding air in a burn care department equipped with bathtubs. In water, the bacterium always aerosolized, but in surrounding air, it diluted itself to such a point that it became undetectable at 1 m or more from the source of emission, which indicated that patients were at low risk of inhaling a dangerous quantity of the microbe
Silver zeolite antimicrobial activity in aluminium heating, ventilation and air conditioning system ducts.
No full textINTRODUCTION:
Air pollution in confined environments is a serious health problem, in that most people spend long periods indoors (in homes, offices, classrooms etc.). Some people (children, the elderly, heart disease patients, asthmatic or allergic subjects) are at greater risk because of their conditions of frailty. The growing use of air-conditioning systems in many public and private buildings aggravates this health risk, especially when these systems are not correctly installed or regularly serviced. The aim of our study was to verify the capacity of Ag+ ions to stop the growth of bacteria and moulds inside the ducts of Heating, Ventilation and Air Conditioning system ducts (HVAC) systems when these ducts were lined with active Ag+ ions zeolite-coated panels.
MATERIAL AND METHODS:
A Y-shaped HVAC model with two branches was used; one branch was made of traditional galvanized iron, as was the whole system, while the other was lined with active Ag+ zeolite-coated polyurethane panels. During the test, samples of dust present inside both ducts were collected and seeded in liquid and solid media to detect bacteria and moulds. The presence of bacteria was also sought in the air emerging from the outlets of both ducts.
RESULTS:
Tests made on samples of particulate collected from the two different ducts revealed a lower total bacterial load in the samples collected from the Ag+ zeolite-coated duct than in the samples from the traditional Zn galvanized duct. In addition, the values of bacterial load found in the air emerging from the Ag+ ions zeolite-lined duct were 5 times lower than those found in the air from the traditional galvanized iron duct.
CONCLUSIONS:
The utilization of Ag+ zeolite-coated panels in air-conditioning systems could improve the quality of the emerging air in comparison with traditional installations in galvanized iron. This innovation could prove particularly advantageous in the event of accidents during the installation of air-conditioning systems or of contaminated aerosols coming from outside
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