天然砂与修饰砂对病毒的吸附与去除

Adsorption and Removing of Virus by Sand and Modified Sand with Metallic Hydroxide

分别在不同pH、含有不同金属阳离子及腐殖酸的脱氯自来水与蒸馏水中,研究了砂与金属氢氧化物修饰砂吸附与去除Polivirus 1(PV1)和Bacteroides fragilis phage(B.fp)的不同效果。结果显示,天然砂吸附病毒效率随水体pH的降低而增加,但当砂表面经氢氧化铝、氢氧化铁沉积修饰后,却在中性pH具有较高的吸附率。金属阳离子可促进天然砂吸附病毒,并随其浓度和价态的增加而增加,但对修饰砂作用不明显。腐殖酸对砂及修饰砂吸附病毒的影响也不同,修饰砂吸附病毒不受腐殖酸的存在及其浓度影响,而天然砂会因腐殖酸的存在及其浓度的提高而降低吸附病毒效率。在任一实验条件下,砂与修饰砂在自来水中的吸附病毒效率高于在蒸馏水中的吸附效率,扫描电镜观察显示砂与修饰砂具有明显不同的表面结构特征,这是两者具有不同吸附效率的基础。从砂与修饰砂吸附PV1的效率高于B.fp的现象说明B.fp是一个更为合适的病毒去除指示生物。本实验结果表明了金属氢氧化物修饰砂可为传统的净水工艺提供高效的病毒去除过滤介质与途径。

The efficiency of adsorption and removing Poliovirus 1(PV1) and bacteroides fragilis phage(B.fp) by nature and modified sand in the conditions of different environment pH, various mental salts and concentration variation, exist of humic acid in tap and distilled water were studied in this paper. The results showed: the lower pH of the water sample, the higher efficiency of natural sand adsorbed viruses. When natural sand was modified by hydroxide aluminum and hydroxide iron sinked to the sand surface and accumulated, the ability of modified sand absorption viruses was higher in neutral pH. Natural sand adsorbed viruses increasing with the presence of metal cations, their contents and valence, but this positive role was not clear to modified sand adsorption viruses. The humic acid also had different influence regulation to natural and modified sand adsorbed viruses. Modified sand was not affected by humic acid, but natural sand adsorbed viruses would be reduced due to humic acid. The reason why the two kinds of sand had different ability adsorbed viruses may be due to the obviously different sand surface construction according to viewing the scanning electron microscope. The ability of natural and modified sand adsorb viruses was higher in distilled water than that in tap water at any experiment conditions. The results of these experiments showed the modified sand by metal hydroxide can provide a higher viruses removing efficiency way for the traditional drinking water treatment craft. The results also showed that the abilities of natural sand and modified sand adsorbed PV1 were higher than that of B.fp at any conditions of adsorption, in other words, the rate of removing PV1 was faster than B.fp. This behavior demonstrates that B.fp is a more suitable index creature used indicates virus抯 inactivation.