| UV和H2 O2联合消毒灭活饮用水中大肠杆菌研究 |
| 摘要点击 4356 全文点击 1559 投稿时间：2012-09-29 修订日期：2012-11-30 |
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| 中文关键词 紫外线 H2 O2 消毒 大肠杆菌 灭活效果 |
| 英文关键词 UV hydrogen peroxide disinfection E. coli inactivation effect |
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| 中文摘要 |
| 以大肠杆菌为研究对象,对单独紫外线(UV)、H2 O2及两者不同组合方式的灭活效果进行了分析. 结果表明,单独H2 O2对大肠杆菌基本无灭活效果,加入浓度为20 mg·L-1的H2 O2接触时间为30 min时,灭活率仅为0.02个对数级; 单独UV工艺可在一定程度上灭活大肠杆菌,紫外线剂量为10 mJ·cm-2时,灭活率可达到4.51个对数级. 紫外线和H2 O2联合消毒在一定程度上提高了消毒效果,且不同的组合方式对灭活效果有很大的影响. 先UV后H2 O2消毒效果优于先H2 O2后UV,当紫外线剂量为5 mJ·cm-2时,加入H2 O2分别反应2.5、5、10、20 min后,两者的灭活率分别较单独UV消毒增加0.09、0.35、0.38、0.68和0.01、0.07、0.14、0.53个对数级. 而UV与H2 O2同时消毒效果优于UV与H2 O2顺序消毒,当紫外线剂量为5 mJ·cm-2时,加入H2 O2反应20 min后,灭活率较UV-H2 O2和H2 O2-UV工艺分别增加了0.43和0.58个对数级. 随着紫外线强度的增加,大肠杆菌的灭活效果不断提高. |
| 英文摘要 |
| The inactivation effect of E. coli with both UV irradiation and hydrogen peroxide disinfection individually and in different combination modes was investigated. The results showed that hydrogen peroxide alone caused hardly any inactivation of E. coli. Only 0.02 lg inactivation was achieved by hydrogen peroxide with concentration of 20 mg·L-1 and contact time of 30 min. UV irradiation was able to inactivate E. coli to a certain extent. The inactivation reached 4.51 lg at a UV dose of 10 mJ·cm-2. The combination of UV and H2 O2 could significantly improve the inactivation effect and the different combination modes affected the inactivation effect. The inactivation effect of UV-H2 O2 was better than that of H2 O2-UV. The inactivation was increased by 0.09, 0.35, 0.38, 0.68 lg and 0.01, 0.07, 0.14, 0.53 lg when compared to the treatment with solely UV irradiation, respectively, at UV dose of 5 mJ·cm-2 with hydrogen peroxide at contact time of 2.5, 5, 10, 20 minutes. UV/H2 O2 achieved better results than sequential disinfection. The inactivation was enhanced by 0.43 lg and 0.58 lg when compared to UV-H2 O2and H2 O2-UV, respectively, at UV dose of 5 mJ·cm-2 with hydrogen peroxide at contact time of 20 minutes. The inactivation of E. coli increased with the enhancement of UV radiation intensity. |
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