LiCl溶液对4种空调典型霉菌、细菌的抑制研究

为防止空调系统内霉菌、细菌的过度孳生，本文以空调系统内常见的黑曲霉（A. niger）、大肠埃希氏菌（E. coli）、金黄色葡萄球菌（S. aureus）、枯草芽孢杆菌（B. subtilis）为典型霉菌、细菌，基于纸片扩散法药敏试验，研究了空调除湿常用工质LiCl溶液对上述典型菌种的抑制作用及浓度影响规律.结果表明：在常见除湿浓度范围（35%~40%）内，LiCl溶液对上述4种典型菌种均有抑制作用；特别是对A. niger抑制效果最强，在15%的低浓度下即可产生明显抑制；其次为E. coli，而对S. aureus和B. subtilis的抑制相对较弱.此外，所得抑制效果随LiCl溶液浓度的提高而明显增强，特别是对A. niger和E. coli，溶液浓度与抑菌圈直径呈显著的正相关性.

Inhibiting effects of LiCl aqueous solution on four typical molds and bacteria in the air-conditioning system

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.