微电流协同氯对水中肠道病毒灭活效果的实验研究

【作者】 王福元；

【导师】 张进；

【作者基本信息】 第四军医大学 ， 劳动卫生与环境卫生学， 2001， 硕士

【摘要】 实验观察了微电流与低水平游离氯对大肠杆菌噬菌体f₂（f₂）和脊髓灰质炎Ⅰ型病毒（PV1）的协同消毒效果，及消毒后病毒感染性、抗原性及超微结构的改变，以期为研究电氯协同消毒饮水的机理和研制协同消毒装置提供线索。 消毒实验分为恒稳微电流(0.4～1.2 mA·cm^-2)、游离氯(0.1～0.3mg·L^-1)及电氯协同三组，每组分数个不同处理水平，分别处理大肠杆菌噬菌体f₂和脊灰病毒纯培养物污染的水样，消毒时间为5、10、30min。用Berenbaum方法判断电流和氯是否具有协同效应，比较灭活率K值（K=-LogN_t/N₀）来评价协同消毒效果。用透射电镜（TEM）观察病毒颗粒形态结构变化，用病毒酶联细胞免疫试验（VELCIA）和蚀斑形成试验（PFUA）观察协同消毒后PV1抗原性和感染性的变化。结果表明： （1）单独电流达到0.4mA·cm^-2时出现弱的灭活作用，灭活作用有一 定的时效和量效关系；游离氯0.1～0.3mg·L^-1对所试微生物在一定作用 时间内的灭活能力也有限。 （2）电流密度0.4～1.2mA·cm^-2协同游离氯0.2mg·L^-1处理水样后，灭 活率比单独使用氯高，随电流密度增加灭活率提高，对f₂电流密度达 到0.6mA·cm^-2或对PV1电流密度达到1.2mA·cm^-2时，微电流与氯有协 同作用，且与单独氯比较灭活率K值有显著差别（p＜0.05）。 （3）在有机物浓度低、pH值低、硬度高的水样中电氯协同消毒效果好。 （4）微电流、氯及二者协同对f₂与PV1灭活率相似，无显著性差异。 （5）TEM结果发现，单独电流处理后f₂、PV1颗粒形态结构基本未发 生变化，单独氯、电氯协同处理后部分病毒颗粒的衣壳内密度下降，微 电流作用后病毒颗粒由集聚趋向分散。 （6）电氯协同可增强氯对PV1感染性灭活，但对抗原未发现明显灭活 作用。更多还原

【Abstract】 This study observed synergetic inactivation efficacy for polioviruses I type and coliphage f2 by low amperage direct currenet (DC) and free chlorine (FC), and seek for change of infectivity, antigenicity and ultrastructure after virus was treated, moreover provided envidence for reserching mechanism of synergetic disinfection and desiging installation of synergetic disinfection.There were three groups treated by DC and FC and DC in combination with FC, and each group was divided into different levels. Water samples polluted f2 and PV1 exposed to DC and FC and DC in combination with FC for 5,10 and 30 minutes. Whether DC and FC were synergetic or not was decided by Berenbaum’s method, and inactivation efficacy was estimated by comparing inactivation rates K value, meanwhile infectivity and antigenity were detected through Plaque Forming Unit Assay(PFUA) and Virus Enzyme-Linked Cell Immunoassay (VELCIA). Morphologic changes were observed under trasmission electron microscope (TEM). The results indicated:(1) Weak effect of inactivation could be observed on 0.4 mA ?cm-2 or above, and the inactivation efficacy was also enhanced with increasing exposure time or DC density; The effect of inactivation for experimental virus by chlorine containing 0.1-0.3 mg ?L"’ could not reach to the sanitation request of disinfection for drinking water.(2) The inactivation rates was higher by 0.4-1.2 mA ?cm-2 DC in combination with 0.2mg ?L-1 than FC alone, and enhanced with increasing DC. The inactivation rates K value of DC reaching to 0.6 mA ?cm-2 for f, or DC reaching to 1.2 mA ?cm-2 for PV1 in combination with FC was significant difference in comparison with FC alone (p<0.05), and inactivation effect of DC in combination FC was synergetic.(3) DC alone or DC in combination with FC producted better effect for water samples of low pH, high hardness and few organism .(4) Inactivation rates for f2 and PV1 treated by DC, FC and DC in combination with FC was samilar, and there were no significant difference.(5) Capsule of virus was not found change after treated by DC, FC and DC in combination with FC under TEM, and inner density of viral grain was partly cut down by FC alone or FC in combination with DC. Viral gathering grain tended to deconcentration after treated by DC.(6) The inactivation of PVI infectivity was increased after synergetic disinfection, but inactivation of PVI antigencity was no change.更多还原