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Research articles

ScienceAsia 42(2016): 109-113 |doi: 10.2306/scienceasia1513-1874.2016.42.109

Removing Cryptosporidium-size microspheres with polyaluminium FeCl3

Tao Yuana,b,c, Ping Lub,*

ABSTRACT:     Cryptosporidium is a genus of protozoa that infects swimming pools causing diarrhoea and other illnesses. In this study, the removal of Cryptosporidium-size microspheres from a 10 000 l swimming pool was evaluated under varying conditions to provide a reliable and efficient water treatment technique. The baseline condition without coagulation (widely practised in swimming pools today) showed that treating a pool with microspheres at a density of 4000 microspheres per litre through a 33 cm diameter sand filter at 30 m/h flow rate removes 25% of Cryptosporidium-size microspheres. The filtration followed by polyaluminium FeCl3 (PAFC) coagulation results in 99% microsphere removal over the 168 h experimental period with filter backwashing every 48 h. Additionally, the impact of the flow rate and filter cross-sectional area was also examined.

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a Department of Architecture Equipment and Civil Engineering, Jiangsu Vocational Institute of Architectural Technology, Xuzhou, 221116, China
b Department of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221000, China
c JiangSu Collaborative Innovation Centre for Building Energy Saving and Construct Technology, Xuzhou, 221116, China

* Corresponding author, E-mail: plu@cumt.edu.cn

Received 14 Feb 2015, Accepted 0 0000