Experimental study on inactivation of microorganism in aqueous solution using ultrasound - 文章详情页

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To　discuss　the　mechanism　of　ultrasonic　sterilization　and　provide　technical　support　for　the　ultrasonic　treatment　for　sludge　disposal,　the　effects　of　ultrasound　power　(250-1500　W)　and　frequencies　(25　and　40　kHz)　on　the　inactivation　rate　of　coliform,　cavitation　intensity　and　production　of　hydroxyl　radicals　were　investigated　with　the　simulated　aqueous　solution.　The　mechanism　of　inactivation　was　preliminarily　discussed.　Results　showed　that　under　the　same　ultrasound　time　and　frequency,　the　inactivation　rate　of　coliform　gradually　increased　with　the　increases　of　ultrasound　power　lower　than　1250　W　and　then　almost　the　same.　The　frequency　of　40　kHz　showed　more　superiority　than　25　kHz　under　the　same　ultrasound　time　and　power.　Cavitation　intensity　and　production　of　hydroxyl　radicals　displayed　similarity　as　the　inactivation　rate　did,　therefore,　the　inactivation　rate　increased　with　the　increases　of　cavitation　intensity　and　production　of　hydroxyl　radicals.　Although　the　effect　of　hydroxyl　radicals　was　weak,　the　oxidation　of　hydroxyl　radicals　did　play　a　role　in　the　sterilization　that　was　identified　by　adding　masking　agents　of　sodium　bicarbonate　(NaHCO3)　into　the　simulated　water.　©,　2015,　Beijing　University　of　Technology.　All　right　reserved.

关键词：

Hydroxyl radical; Inactivation; Intensity of cavitation; Masking agent; Ultrasound

作者机构：

[ 1 ] [Yang, Y.-L.]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
[ 2 ] [Ma, C.-H.]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
[ 3 ] [Li, X.]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
[ 4 ] [Zhou, Z.-W.]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
[ 5 ] [Wang, X.-N.]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
[ 6 ] [Li, H.-L.]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
[ 7 ] [Xu, H.-Y.]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China

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