开展了H2O2/O3灭活隐孢子虫(Cryptosporidium parvum)的研究。考察了H2O2和O3投加比例、过氧化氢作用效果、无机金属离子等因素的影响。结果表明,H2O2/O3协同技术具有最佳的灭活效果,H2O2的投加不仅降低了药剂(O3)的初始浓度(投量2.0mg/L),而且缩短了灭活时间(7.0 min),达到理想的灭活效果(灭活率99.0%以上)时,H2O2/O3摩尔比为0.8;同时考察了水中常见离子对H2O2/O3灭活效果的影响,低浓度的Ca2+,Mg2+和Cu2+等二价金属离子均对灭活起到一定促进作用,一价离子Na+对灭活无明显的作用,而NO-3,HCO-3和Cl-在一定范围内抑制了H2O2/O3对隐孢子虫的灭活。
Abstract
In order to research the synergistic effect of H2O2/O3 inactivating Cryptosporidium parvum in water, factors including the proportions of H2O2 and O3, the effect of hydrogen peroxide, and the inorganic metal ion were investigated by using fluorescence staining method. It could achieve the desired inactivation of Cryptosporidium parvum(inactivation rate above 99.0%). H2O2 not only reduces the initial concentration of bactericide (O3 dosage of 2.0 mg/L), but also shortens the sterilizing time (7.0 min). The best H2O2/O3 molar ratio is 0.8. Common ions in water, such as divalent metal ions Ca2+, Mg2+ and Cu2+ play catalytic roles in the inactivation, while Na+ has no obvious effect on the inactivation, and NO-3, HCO-3 and Cl- restrain the inactivation of Cryptosporidium parvum to some extent.
关键词
隐孢子虫 /
H2O2/O3 /
饮用水 /
灭活
Key words
Cryptosporidium parvum;H2O2/O3 /
drinking water /
inactivation
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基金
广东省自然科学基金(S2012040007855)
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