Experimental study on microorganism ecological distribution and contamination mechanism in supply air ducts
Experimental study on microorganism ecological distribution and contamination mechanism in supply air ducts
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送风管道微生物生态分布及污染机理实验研究
DOI：
10.1016/j.enbuild.2011.12.025
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发表时间：
2012-04-01
影响因子：
6.7
通讯作者：
Pu, Yueli
中科院分区：
文献类型：
--
作者：
Li, Angui;Liu, Zhijian;Pu, Yueli
为了研究送风管道中微生物的生态分布和污染机理，在不同情况下进行了一系列微生物数量检测和微生物种类鉴定实验。结果表明，在由球菌和芽孢杆菌组成的所有细菌中，革兰氏阳性占56%，革兰氏阴性占44%。检测到的真菌有青霉菌、曲霉、枝孢菌、互交菌、毛霉和木霉，分别占30.1%、17.2%和41.8%。分别为5.6%、2.8%和0.5%，优势真菌为青霉菌、曲霉菌和枝孢菌。送风速度对整个试验装置的粉尘分布有很大影响。微生物数量与沉降尘呈显著正相关，沉降尘增加1倍时，微生物数量最多可增加1 ~ 2倍，细菌相关系数显著高于真菌（R-bacteria > R-fungi）。微生物数量随相对湿度和温度的升高而下降，细菌对相对湿度和温度的敏感性大于真菌（R-bacteria > R-fungi）。正交试验设计表明，温度是影响真菌生长的主要因素，而在送风速度为3.0 m/s时，相对湿度是影响真菌生长的主要因素。爱思唯尔B.V.版权所有
To investigate the microorganism ecological distribution and contamination mechanism in supply air ducts, a series of experiments for testing microbial counts and identifying the microorganism species were conducted under different cases. The results showed that Gram-positive accounted for 56% while Gram-negative for 44% for all bacteria which were made up of Cocci and Bacillus. The detective fungi contained Penicillium, Aspergillus, Cladosporium, Alternaria, Mucor, and Trichoderma, which accounts for 30.1%, 17.2%, 41.8%. 5.6%, 2.8%, 0.5%, respectively and the predominant fungi were Penicillium, Aspergillus and Cladosporium. The supply air velocity had a great influence on the dust distribution in whole test facility. The microorganism counts and deposition dust were positively correlated, when deposition dust increased 1 times, the microorganism counts could maximally increase 1-2 times, and the bacteria correlation coefficient was more significant than fungi (R-bacteria > R-fungi). The microorganism counts declined with relative humidity and temperature increasing, and the bacteria were more susceptible to the relative humidity and temperature than fungi (R-bacteria > R-fungi). Orthogonal experiment design indicated the main factor of the microbial growth was temperature: but at supply air velocity of 3.0 m/s, the relative humidity was the main influence factor to the fungal growth. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.