室内微风扰动下墙面霉斑表面扩散范围研究

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (1603 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract This study experimentally investigated the diffusion range of mold spots on moldy walls under the disturbance of indoor breeze airflow. A mold-release experimental bench was designed to focus on the most commonly used plaster-gypsum building materials on indoor walls. The experiment varied airflow conditions such as airflow speeds (0.2~1.0m/s), airflow angles (0°~90°), temperatures (18℃~30℃), and relative humidity (35%~75%) to understand their impact on mold contamination. The results showed that, even when disturbed by the breeze airflow for a short time (10min), the mold spots on the wall surface had strong contamination diffusion, and their diffusion range could be up to 29 times the diameter of the original mold spots themselves. The diffusion area was seriously contaminated, and the concentration of the molds could be as high as 10CFU/cm². The range of the surface diffusion of the mold spots increased with the decrease of the relative humidity, the increase of the wind speed, and the reduction of the airflow angle to the wall. The effect of temperature on the release of mold pollutants was weak. The results of the hierarchical analysis showed that the influence of indoor breeze conditions on the spreading range of mold was ranked as follows: airflow velocity (38.65%) > relative humidity (30.70%) > airflow angle (30.65%); while temperature showed little effect. The results provide valuable insights into controlling the spread of indoor mold contamination, particularly in understanding the effects of indoor breeze conditions.

Key words： mold pollution building environment indoor walls airflow conditions

Received: 31 October 2023

PACS:	X172
	TU834

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	CHEN Yu-zhu
	YANG Zi-li
	WU Jie
	QU Cheng
	WANG Xian-yu
	LIU Xue-lin
	ZHANG Jun-xiang

Cite this article:

CHEN Yu-zhu,YANG Zi-li,WU Jie等. Study on the diffusion range of mold contaminants on wall surfaces under indoor breeze disturbance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3091-3099.

URL:

http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I6/3091

[1] 肖栋天,石发恩.通风空调环境中微生物气溶胶污染及其防治[J].环境科学与技术, 2017,40(8):139-152. Xiao D T, Shi F E. Microbial aerosol pollution in ventilation and air conditioning systems:prevention and control[J]. Environmental Science&Technology, 2017,40(8):139-152.
[2] 王志新,宏丹,鲁雷震,等.比浊法测定硫酸多黏菌素抑制霉菌的条件优化[J].食品与发酵工业, 2020,46(7):21-27. Wang Z, Hong D, Lu L Z, et al. Optimization of conditions for turbidimetric assay of the inhibitory effect of sulphuric acid polymyxin on fungi[J]. Food and Fermentation Industries, 2020,46(7):21-27.
[3] Daisey J M, Angell W J, Apte M G. Indoor air quality, ventilation and health symptoms in schools:An analysis of existing information[J]. Indoor Air, 2003,13(1):53-64.
[4] Park J H, Cox-Ganser J M. NIOSH Dampness and mold assessment tool (DMAT):Documentation and data analysis of dampness and mold-related damage in buildings and its application[J]. Buildings-Basel, 2022,12(8):1075-1092.
[5] Li X, Liu D, Yao J. Aerosolization of fungal spores in indoor environments[J]. Sci. Total Environ., 2022,820:153003.
[6] Krijgsheld P, Bleichrodt R, Van Veluw G J, et al. Development in Aspergillus[J]. Studies in Mycology, 2013,74:1-29.
[7] Reponen T, Singh U, Schaffer C, et al. Visually observed mold and moldy odor versus quantitatively measured microbial exposure in homes[J]. Sci. Total Environ., 2010,408(22):5565-5574.
[8] 卢振.通风空调系统空气微生物传播与消毒控制方法[D].哈尔滨:哈尔滨工业大学, 2009. Lu Z. Methods for controlling the spread and disinfection of airborne microorganisms in ventilation and air conditioning systems.[D]. Harbin:Harbin Institute of Technology, 2009.
[9] 李西安.空调通风管路内黑曲霉孢子的气溶胶化研究[D].大连:大连理工大学, 2022. Li X A. Study on the aerosolization of Aspergillus spores in air conditioning and ventilation ducts.[D]. Dalian:Dalian University of Technology, 2022.
[10] Pasanen A L, Pasanen P, Jantunen M J, et al. Significance of air humidity and air velocity for fungal spore release into the air[J]. Atmospheric Environment Part a-General Topics, 1991,25(2):459-462.
[11] 贾天天.人员走动对室内气流组织的影响研究[D].西安:西安交通大学, 2015. Jia T T. Study on the influence of personnel movement on indoor airflow organization.[D]. Xi'an:Xi'an Jiaotong University, 2015.
[12] EN779-2012 Particulate air filters for general ventilation-determination of the filtration performance[S].
[13] 丁秋霞,王永生.纸面石膏板受潮挠度过大的原因分析及改善措施[J].新型建筑材料, 2011,38(8):12-15. Ding Q X, Wang Y S. Analysis of the reasons for excessive deflection of paper-faced gypsum board due to moisture and improvement measures[J]. New Building Materials, 2011,38(8):12-15.
[14] 赵子恒,杨自力,谷雨倩,等.超声波隔空强化空调除湿溶液灭活黑曲霉[J].中国环境科学, 2023,43(9):4561-4567. Zhao Z H, Yang Z L, Gu Y Q, et al. Ultrasonic enhanced air conditioning dehumidification solution inactivates Aspergillus niger[J]. China Environmental Science, 2023,43(9):4561-4567.
[15] Li X, Wang S, Zhang T, et al. Prediction of aerosolized fungal spores by determining respiratory intensity of the growing colony[J]. Aerosol and Air Quality Research, 2020,20(4):776-786.
[16] GB50176-2016民用建筑热工设计规范[S]. GB 50176-2016 Thermal design code for civil building[S].
[17] Górny R L, Reponen T, Grinshpun S A, et al. Source strength of fungal spore aerosolization from moldy building material[J]. Atmospheric Environment, 2001,35(28):4853-4862.
[18] Yang Z L, Chen L A, Yang C, et al. Portable ultrasonic humidifier exacerbates indoor bioaerosol risks by raising bacterial concentrations and fueling pathogenic genera[J]. Indoor Air, 2022,32(1):12964.
[19] Gopalakrishnan S, Devassikutty A K, Mathew M, et al. Passive release of fungal spores from synthetic solid waste surfaces[J]. Aerosol and Air Quality Research, 2016,16(6):1441-1451.
[20] Gopalakrishnan S, Arigela R, Gupta S K, et al. Dynamic response of passive release of fungal spores from exposure to air[J]. Journal of Aerosol Science, 2019,133:37-48.
[21] Bowen W R, Lovitt R W, Wright C J. Direct quantification of Aspergillus niger spore adhesion to mica in air using an atomic force microscope[J]. Colloid Surf A-Physicochem Eng Asp, 2000,173(1-3):205-210.
[22] Madsen A M. Effects of airflow and changing humidity on the aerosolization of respirable fungal fragments and conidia of Botrytis cinerea[J]. Appl Environ Microbiol, 2012,78(11):3999-4007.
[23] Johansson P, Ekstrand-Tobin A, Svensson T, et al. Laboratory study to determine the critical moisture level for mould growth on building materials[J]. International Biodeterioration&Biodegradation, 2012, 73:23-32.
[24] Sivasubramani S K, Niemeier R T, Reponen T, et al. Assessment of the aerosolization potential for fungal spores in moldy homes[J]. Indoor Air, 2004,14(6):405-412.
[25] Mold Guides. How long does it take for mold to grow?Exploring the Factors and Remediation[EB/OL]. https://www.moldguides.com/how-long-does-it-take-for-mold-to-grow/2023-10-03.
[26] GB4789.15-2016霉菌和酵母计数[S]. GB4789.15-2016 Mold and Yeast Enumeration[S].
[27] 杨薇,邹钺,谷雨倩,等.梅雨时期空调表冷器对送风中真菌气溶胶的影响[J].东华大学学报(自然科学版), 2023,49(3):104-111. Yang W, Zou Y, Gu Y Q, et al. The influence of air conditioning evaporators on fungal aerosols in the air supply during the Meiyu season[J]. Journal of Donghua University (Natural Science Edition), 2023,49(3):104-111.
[28] 谷长城.矩形通风空调管道内尘粒沉降速度的预测[D].西安:西安建筑科技大学, 2006. Gu C C. Prediction of settling velocity of dust particles in rectangular ventilation air conditioning ducts[D]. Xi'an:Xi'an University of Architecture and Technology, 2006.
[29] 方治国,黄闯,楼秀芹,等.南方典型旅游城市空气微生物特征研究[J].中国环境科学, 2017,37(8):2840-2847. Fang Z G, Huang C, Lou X Q, et al. Study on the characteristics of airborne microorganisms in typical tourist cities in the southern area of China[J]. Environmental Science in China, 2017,37(8):2840-2847.