【作者单位】1 College of Environmental Science and Engineering, Donghua University, Shanghai; 201620, China (2 Department of Radiology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai; 201620, China (3 Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing; 100029, China
【摘要】To prevent the excessive growth of molds and bacteria in the air-conditioning system (ACs), the inhibiting effects on common molds and bacteria in ACs of LiCl aqueous solution, a widely-used liquid desiccant in the ACs, were investigated in detail with the disk diffusion method. The four typical molds and bacteria, i.e., Aspergillus niger (A. niger), Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis), were selected for the study. LiCl solution was found to show significant inhibiting effects on the four microbes under the usual concentration range (35%~40%) for air dehumidification. In particular, the most potent effect was on the A. niger, on which significant inhibiting effects were observed with the desiccant solution at a low concentration (merely 15%), followed by the gram-negative bacteria E. coli. In contrast, inhibiting effects on S. aureus and B. subtilis, the gram-positive bacteria, were relatively weaker. Furthermore, a positive correlation was found between the LiCl solution's concentration and the diameter of inhibition zones of A. niger and E. coli, which indicated stronger inhibiting effects with the rising concentration of the LiCl solution.