Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland.
Finnish Institute of Occupational Health, Työterveyslaitos, Finland.
Ann Work Expo Health. 2019 Feb 16;63(2):242-255. doi: 10.1093/annweh/wxy096.
To shorten the time for airborne dust concentration to be reduced to a lower level after a renovation task has been completed, a short-term water misting method was assessed. A short-term water misting method is based on low water consumption to avoid harmful wetting of materials. The method is considered similar to a general ventilation method that dilutes work-generated airborne dust concentrations. Thus, short-term misting is not intended to replace the source control measures.
Airborne dust removal by the short-term water misting performed after dust generation was evaluated in a controlled laboratory settings by comparing PM10 decay and inhalable dust concentrations between a control and misting tests (average water flow = 0.22 l min-1) of 2 and 4 min. A portable handheld misting device was used. The practicability and effectiveness of the misting technique as a supplementary control measure was verified in the three field cases.
In laboratory tests, reductions in airborne PM10 and inhalable dust were 30% and 28%, avoiding condensation of water to surfaces. In the field, inhalable dust concentrations were reduced by 86-95% after an hour from the misting, whereas ventilation alone was calculated to dilute dust concentrations by 18-39%. Average clean air delivery rates varied from 0.03 to 0.07 m3 s-1.
Short-term misting after a dust-generating task is an effective measure to control the airborne dust after dust-producing tasks in environments where an effective air exchange for dust removal is not a feasible alternative. The information obtained from the study is beneficial to construction and renovation project management personnel and field practitioners.
为了缩短装修任务完成后空气中粉尘浓度降至较低水平所需的时间，评估了一种短期水雾法。短期水雾法基于低耗水量，以避免材料受到有害浸湿。该方法被认为类似于稀释作业产生的空气中粉尘浓度的一般通风方法。因此，短期喷雾并不旨在替代源头控制措施。
在受控实验室环境中，通过比较对照和喷雾测试（平均水流量= 0.22 l min-1）中 PM10 衰减和可吸入粉尘浓度，评估了短期水雾法在粉尘产生后对空气中粉尘的去除效果。使用了一种便携式手持式喷雾装置。在三个现场案例中验证了喷雾技术作为补充控制措施的实用性和有效性。
在实验室测试中，避免了表面凝结，空气中的 PM10 和可吸入粉尘的减少率分别为 30%和 28%。在现场，喷雾后一小时内可吸入粉尘浓度降低了 86-95%，而单独通风计算的粉尘浓度稀释率为 18-39%。平均清洁空气输送率从 0.03 到 0.07 m3 s-1 不等。
在产生粉尘的任务之后进行短期喷雾是一种有效的措施，可以控制在去除粉尘的有效空气交换不可行的环境中，在产生粉尘的任务之后空气中的粉尘。从研究中获得的信息对建筑和装修项目管理人员和现场从业者有益。
