Synergy in sequential inactivation of Cryptosporidium parvum with ozone/free chlorine and ozone/monochloramine

被引：78

作者：

Rennecker, JL ^{[1
]}

Driedger, AM ^{[1
]}

Rubin, SA ^{[1
]}

Mariñas, BJ ^{[1
]}

机构：

[1] Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA

来源：

WATER RESEARCH | 2000年 / 34卷 / 17期

关键词：

animal infectivity; Crysptosporidium parvum; free chlorine; inactivation kinetics; in-vitro excystation; monochloramine; ozone; synergy; temperature dependence;

D O I：

10.1016/S0043-1354(00)00188-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The main objective of this study was to investigate the inactivation kinetics of Cryptosporidium parvum oocysts with sequential disinfection schemes involving ozone as a primary disinfectant, and free chlorine or monochloramine as a secondary disinfectant. Two types of synergistic effects were observed. Ozone pre-treatment resulted in the removal of the relatively more pronounced initial lag phases observed for monochloramine and hypochlorous acid. An additional and more important synergistic effect was an enhancement in the rate of secondary inactivation with both hypochlorous acid and monochloramine after complete removal of the lag phase by ozone pretreatment. A stronger synergy was observed at a lower temperature. The secondary inactivation rate was 1.1-2.8 (hypochlorous acid) and 2.4-9.2 (monochloramine) times faster than the corresponding post lag-phase primary inactivation rate at respective temperatures of 30-10 degreesC. Consistency between the two viability assessment methods, modified in-vitro excystation and animal infectivity, was demonstrated or shown for both primary inactivation with ozone and secondary inactivation with ozone/monochloramine. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：4121 / 4130

页数：10

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