title: Eutrophic water purification efficiency using a combination of hydrodynamic cavitation and ozonation on a pilot scale.
abstract: This paper presents the purification of eutrophic water using a combination of hydrodynamic cavitation (HC) and ozonation (O3) at a continuous flow of 0.8 m(3) h(-1) on a pilot scale. The maximum removal rate of chlorophyll a using O3 alone and the HC/O3 combination was 62.3 and 78.8%, respectively, under optimal conditions, where the ozone utilization efficiency was 64.5 and 94.8% and total energy consumption was 8.89 and 8.25 kWh m(-3), respectively. Thus, the removal rate of chlorophyll a and the ozone utilization efficiency were improved by 26.5% and 46.9%, respectively, by using the combined technique. Meanwhile, total energy consumption was reduced by 7.2%. Turbidity linearly decreased with chlorophyll a removal rate, but no linear relationship exists between the removal of COD or UV254 and chlorophyll a. As expected, the suction-cavitation-assisted O3 exhibited higher energy efficiency than the extrusion-cavitation-assisted O3 and O3 alone methods.
authors.affiliation: Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of China, Jiangwangmiao Str 8, 210042, Nanjing, China.
authors.forename: Wei-Xin
authors.initials: WX
authors.lastname: Li
authors.forename: Chuan-Dong
authors.initials: CD
authors.lastname: Tang
authors.forename: Zhi-Lin
authors.initials: ZL
authors.lastname: Wu
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Wang
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhao
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Cravotto
mesh_terms: D002734:Chlorophyll / Q000031:analogs & derivatives; D000077194:Chlorophyll A; D005068:Eutrophication / Q000502:physiology*; D057446:Hydrodynamics; D010126:Ozone; D010865:Pilot Projects; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D002734:Chlorophyll; C085815:chlorophyll a'; D010126:Ozone; D000077194:Chlorophyll A