title: Measuring the effectiveness of a pilot scale bioreactor for removing Microcystis in an outdoor pond system.
abstract: A pilot scale fluidized bed bioreactor to control the cyanobacterium, Microcystis, was tested in an outdoor experimental pond system (28 m3) over a 57 day period. The pond system was inoculated with a wild bloom of Microcystis, and the bioreactor was preinoculated with an oligochaete, Aeolosoma hemprichi, which is known to prey on colonial Microcystis. This and other Microcystis predators such as the rotifer, Philodina erythrophthalma were observed to colonize the bioreactor during the experiment. The bioreactor performance in removing Microcystis was estimated using a mathematical model and a multiple regression analysis of the chlorophyll-a concentration, which was a satisfactory surrogate for the Microcystis cell density in the ponds. The estimated specific decrease in chlorophyll-a concentration due to bioreactor treatment was 0.04 day-1, which was equal to the net removal of 4.3 x 10(11) Microcystis cells day(-1) from the treated pond.
authors.affiliation: Environmental Chemistry Division, National Institute for Environmental Studies (NIES), 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan. itayama@nies.go.jp
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Itayama
authors.forename: Norio
authors.initials: N
authors.lastname: Iwami
authors.forename: Mitsuyo
authors.initials: M
authors.lastname: Koike
authors.forename: Takashi
authors.initials: T
authors.lastname: Kuwabara
authors.forename: Niwooti
authors.initials: N
authors.lastname: Whangchai
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Inamori
mesh_terms: D000818:Animals; D019149:Bioreactors; D002734:Chlorophyll / Q000378:metabolism; D005068:Eutrophication; D005618:Fresh Water; D046931:Microcystis / Q000378:metabolism*; D009835:Oligochaeta; D012403:Rotifera; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D002734:Chlorophyll