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Solar disinfection of natural waters with modified solar concentrators

机译：用改进的太阳能集中器对天然水进行太阳能消毒

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摘要

Solar water disinfection is a proven method for household purification of drinking water. Compound parabolic collectors (CPCs) have been used to enhance the inactivation rate of microorganisms. In the present study, a modified CPC with a higher concentration ratio of 1.1 was employed to further speed up the process. A large number of tests were conducted with water samples collected from different naturally contaminated water sources of varying characteristics under natural sunlight. Results indicated substantial reduction in exposure time for complete inactivation of indicator organisms, total conforms and Eschehchia coli, in modified CPCs compared with that in PET bottles at different solar intensity conditions. Even with weak solar intensity conditions (average values <400 w/m~2), complete inactivation of test organisms could be achieved in all the test waters including those with high initial concentrations (total conforms - 1.1 × 10~6 MPN/100 mL. and E. coli -1.25× 10~5CFU/mL) within 6 h of exposure when modified CPC was employed. No regrowth of microorganisms was observed in the modified CPC up to 48 h of storage following exposure. The study thus suggests that the use of modified solar concentrators can result in significant reduction in the exposure time required for complete inactivation of naturally occurring microorganisms.
机译：太阳能消毒是一种用于家庭生活饮用水净化的成熟方法。复合抛物线收集器（CPC）已用于提高微生物的灭活率。在本研究中，采用浓度比为1.1的改进的CPC以进一步加快该过程。对在自然阳光下从具有不同特性的不同自然污染水源中收集的水样进行了大量测试。结果表明，与在不同日照强度条件下的PET瓶相比，改性CPC中指示生物，总构象和大肠杆菌完全灭活的暴露时间大大减少。即使在日照强度较弱的条件下（平均值<400 w / m〜2），也可以在包括高初始浓度的所有测试水中使测试生物完全灭活（总量符合-1.1×10〜6 MPN / 100 mL当使用修饰的CPC时，在暴露后6小时内（..和E. coli -1.25×10〜5CFU / mL）。暴露后直至储存48小时，在改良的CPC中均未观察到微生物的再生。因此，研究表明，使用改性的太阳能集中器可以大大减少自然微生物完全失活所需的暴露时间。

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