宁夏回族自治区2011年公共场所集中空调通风系统卫生状况调查分析

Analysis on Quality of Central Air-conditioning Ventilation System at Public Places in Ningxia in 2011

目的掌握宁夏回族自治区公共场所集中空调通风系统卫生状况。方法 2011年8—9月,从宁夏回族自治区5个地级市随机抽取50家空调使用单位的50套集中空调通风系统,按照《公共场所集中空调通风系统卫生规范》,采集风管内表面积尘300份,检测积尘量、细菌总数、真菌总数;采集冷却塔冷却水44份,检测嗜肺军团菌。结果 50家监测单位,合格36家,合格率为72.0%。风管内表面积尘量合格率98.0%;真菌总数合格率96.7%;细菌总数合格率84.0%;冷却水嗜肺军团菌的样品合格率100.0%。结论宁夏回族自治区公共场所集中空调通风系统存在不同程度的污染,应定期对公共场所集中空调系统进行清洗消毒,加强监督监测。

Objectives To investigate the hygienic status of central air-conditioning ventilation system at some public places in Ningxia. Methods Fifty central air-conditioning ventilation systems from 5 districts of Ningxia were selected randomly. A total of 300 samples from the inside surface of air ducts were collected in August to September in 2011 and the dust weight, total bacteria count and total fungi count of samples were detected. Legionella bacteria in 44 samples of cooling water were also detected. Samples were collected and tested according to the Health Standard for Centralized Air-conditioning System at Public Places. Results The qualified rate for these 50 central air-conditioning systems was 72.0%. The qualified rates for dust weight, total bacteria count and total fungi count on the inside surface of air ducts were 98.0% ,84.0% and 96.7% respectively. And the qualified rate for legionella bacteria in cooling water was 100%. Conclusions There were some degrees of contamination in part of central air-conditioning and ventilation systems in Ningxia. Control measures of cleaning and disinfection should be conducted regularly, and the supervision on hygienic management should be strengthened.