UV dosimetry for solar water disinfection (SODIS) carried out in different plastic bottles and bags
UV dosimetry for solar water disinfection (SODIS) carried out in different plastic bottles and bags
复制标题
在不同塑料瓶和塑料袋中进行太阳能水消毒(SODIS)的紫外线剂量测定
DOI:
10.1016/j.snb.2014.11.031
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Lawrie K
中科院分区:
文献类型:
--
作者:
Lawrie K
Solar water disinfection (SODIS) is a well-established inexpensive means of water disinfection in developing countries, but lacks an indicator to illustrate its end-point. A study of the solar UV dosage required for SODIS, in order to achieve a bacteria concentration below the detection limit for:Escherichia coli,Enterococcusspp. andClostridium perfringens, in water in PET bottles, PE and PE/EVA bags showed disinfection to be most efficient in PE bags, with a solar UV (290–385 nm) dose of 389 kJ m−2required. In parallel to the disinfection experiments, a range of polyoxometalate, semiconductor photocatalysis and photodegradable dye-based solar UV dosimeter indicators were tested under the same solar UV irradiation conditions. All three types of dosimeter produced indicators that largely and significantly change colour upon exposure to 389 kJ m−2solar UV; further indicators are reported which change colour at higher doses and hence would be suitable for the less efficient SODIS containers tested. All indicators tested were robust, easy to use and inexpensive so as not to add significantly to the attractive low cost of SODIS. Furthermore, whilst semiconductor photocatalyst and photodegradable dye based indicators are disposable, one-use systems, the polyoxometalate based indicators recover colour in the dark overnight, allowing them to be reused, and hence further decreasing the cost of using indicators during the implementation of the SODIS method.
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