Removals of cryptosporidium parvum oocysts and cryptosporidium-sized polystyrene microspheres from swimming pool water by diatomaceous earth filtration and perlite-sand filtration.

Autor:	Lu P; Department of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China E-mail: lupingcumt@126.com; Civil and Environmental Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223, USA., Amburgey JE; Civil and Environmental Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223, USA., Hill VR; Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases, Waterborne Disease Prevention Branch, Atlanta, GA 30329, USA., Murphy JL; Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases, Waterborne Disease Prevention Branch, Atlanta, GA 30329, USA., Schneeberger CL; Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases, Waterborne Disease Prevention Branch, Atlanta, GA 30329, USA., Arrowood MJ; Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases, Waterborne Disease Prevention Branch, Atlanta, GA 30329, USA., Yuan T; Department of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China E-mail: lupingcumt@126.com; JiangSu Collaborative Innovation Center for Building Energy Saving and Construct Technology, Xuzhou 221116, China.
Jazyk:	angličtina
Zdroj:	Journal of water and health [J Water Health] 2017 Jun; Vol. 15 (3), pp. 374-384.
DOI:	10.2166/wh.2017.221
Abstrakt:	Removal of Cryptosporidium-sized microspheres and Cryptosporidium parvum oocysts from swimming pools was investigated using diatomaceous earth (DE) precoat filtration and perlite-sand filtration. In pilot-scale experiments, microsphere removals of up to 2 log were obtained with 0.7 kg·DE/m 2 at a filtration rate of 5 m/h. A slightly higher microsphere removal (2.3 log) was obtained for these DE-precoated filters when the filtration rate was 3.6 m/h. Additionally, pilot-scale perlite-sand filters achieved greater than 2 log removal when at least 0.37 kg/m 2 of perlite was used compared to 0.1-0.4 log removal without perlite both at a surface loading rate of 37 m/h. Full-scale testing achieved 2.7 log of microspheres and oocysts removal when 0.7 kg·DE/m 2 was used at 3.6 m/h. Removals were significantly decreased by a 15-minute interruption of the flow (without any mechanical agitation) to the DE filter in pilot-scale studies, which was not observed in full-scale filters. Microsphere removals were 2.7 log by perlite-sand filtration in a full-scale swimming pool filter operated at 34 m/h with 0.5 kg/m 2 of perlite. The results demonstrate that either a DE precoat filter or a perlite-sand filter can improve the efficiency of removal of microspheres and oocysts from swimming pools over a standard sand filter under the conditions studied.
Databáze:	MEDLINE
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