[Monitoring of aerosol microorganisms in the air of hospital sewage treated by membrane biological reactor].
OBJECTIVE
To monitor aerosols exhaling into the air from the process of hospital sewage treated by membrane biological reactor (MBR).


METHODS
The aerosol microorganisms under negative pressure, normal pressure and partially open status of MBR a hospital sewage treatment station were determined, and were emphasized on their quantity and particle size distribution using Andersen sampler.


RESULTS
Under negative pressure status, the average concentrations of the bacteria and fungi in the workshop, were lower than those of normal pressure and partially open status. Obviously, the bacteria concentrations (388 CFU/m3) in the air treated by high efficiency air filter were lower than the bacteria concentration (8039 CFU/m3) in the off-gas without treatment, the removal rates were up to 95.2%.


CONCLUSIONS
Under negative pressure status, the off-gas of MBR treated by high efficiency air filter could lead to secondary pollution to ambient air.
Nie
Xiao
X
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China. niexiao1205@126.com
Tang
Mengmeng
M
Gu
Ping
P
D000336:Aerosols / Q000032:analysis*; D000391:Air Microbiology; D000397:Air Pollution / Q000032:analysis; D019149:Bioreactors; D004784:Environmental Monitoring / Q000379:methods; D006761:Hospitals; D008567:Membranes, Artificial; D012722:Sewage / Q000382:microbiology / Q000821:virology; D014865:Waste Disposal, Fluid / Q000379:methods*
D000336:Aerosols; D008567:Membranes, Artificial; D012722:Sewage