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Safety assessment of ozone technological process for recirculated cooling water treatment in central air conditioning system in a hospital of Shanghai
Author(s): 
Pages: 2561-2564
Year: Issue:  18
Journal: Occupation and Health

Keyword:  OzoneRecirculated cooling waterCentral air conditioning system;
Abstract: [Objective] To evaluate the application effect and environmental pollution of ozone technological process for recirculated cooling water treatment in central air conditioning system.[Methods] The central air conditioning cooling tower using ozone technology in a hospital of Shanghai was selected as a pilot.The methods from the Hygienic specification of central air conditioning ventilation system in public buildings (WS 394-2012) were applied to perform monitoring and analysis on circulating cooling water quality,sterilization effect and environmental pollution.[Results] After treatment by ozone technological process,the water quality of the cooling tower met national standards,and legionella was not detected in the cooling water despite of background pollution.The total bacteria count was 0~5 CFU/ml and coliform group was not detected.The average concentration of ozone at 1 meter around the cooling tower was 0.25 mg/m3,and the ozone concentration at 5 meters around the cooling tower was close to the background level (0.02 mg/m3).[Conclusion] The application of ozone technological process in central air conditioning water treatment system has satisfactory effect on water quality control and sterilization,and the system would not threaten the public health security of the surrounding environment under normal operation.
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