Pilot study on control of phytoplankton by zooplankton coupling with filter-feeding fish in surface water.
A pilot-scale facility was originally designed to control phytoplankton in algae-laden reservoir water characterized by summer cyanobacteria blooms (mainly Microcystis flos-aquae). The system made good use of the different food habits of Daphnia magna and silver carp. Zooplankton (Daphnia magna), filter-feeding fish (silver carp), and zooplankton (Daphnia magna) were stocked in three separated tanks in sequence, respectively. Thus, single-cell phytoplankton and some Microcystis flos-aquae in small size were first grazed by Daphnia magna in the first tank, and in the second tank phytoplankton larger than 10 microm were filtered by silver carp, and the concentration of the remaining phytoplankton was further reduced to a rather low level by Daphnia magna in the third tank. The results showed that the system had good removal efficiencies of phytoplankton and chlorophyll a, 86.85% and 59.41%, respectively, and permanganate consumption (COD(Mn)) and turbidity were lowered as well. A high phytoplankton removal efficiency and low cost indicated that the system had a good advantage in pre-treating algae-laden source water in drinking water works.
Ma
Hua
H
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, PO Box 2650, Harbin 150090, China. water_mh@163.com
Cui
Fuyi
F
Liu
Zhiquan
Z
Fan
Zhenqiang
Z
D000818:Animals; D002347:Carps / Q000502:physiology*; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D003621:Daphnia / Q000502:physiology*; D056890:Eukaryota / Q000166:cytology / Q000302:isolation & purification; D005247:Feeding Behavior / Q000502:physiology*; D005374:Filtration; D017895:Manganese Compounds / Q000378:metabolism; D046931:Microcystis / Q000166:cytology / Q000302:isolation & purification; D009391:Nephelometry and Turbidimetry; D010087:Oxides / Q000378:metabolism; D010100:Oxygen / Q000302:isolation & purification; D010839:Phytoplankton / Q000166:cytology / Q000302:isolation & purification*; D010865:Pilot Projects; D011235:Predatory Behavior / Q000502:physiology; D013499:Surface Properties; D018508:Water Purification / Q000379:methods*; D015048:Zooplankton / Q000502:physiology*
D017895:Manganese Compounds; D010087:Oxides; D002734:Chlorophyll; C048856:permanganic acid; D010100:Oxygen; D000077194:Chlorophyll A