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Environmental Engineering Research 2009;14(4): 220-225. DOI: https://doi.org/10.4491/eer.2009.14.4.220
Fundamental Structure in Simultaneous Removal for Phytoplankton and Nutrient Salt in Lakes
Tatsuhiro Seki1, Yuuichi Ishii2, Toshio Ishii1, and Kazuo Taki1
1Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino-shi, Chiba 275-8588, Japan
2National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba-shi, Ibaraki 305-8506, Japan
Corresponding Author: Kazuo Taki ,Tel: +81-47-478-0452, Fax: +81-47-478-0452, Email: taki.kazuo@it-chiba.ac.jp
Received: June 8, 2009;  Accepted: October 9, 2009.
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The water quality in eutrophic lakes is affected by serious problems, such as abnormal increasing of Cyanobacteria. The purpose of this study was to investigate the possibility of a modified flotation system using a hybrid technique formed by chemical compounds and an electrostatic bridge. Therefore, experiments using the hybrid technique were performed to measure the zeta potential value on the phytoplankton surface and the removal efficiencies of phytoplankton, ammonia nitrogen, nitrate nitrogen and phosphoric acid. The results were as follows: Firstly, the zeta potential of M.aeruginosa was observed to approach charge neutralization due to adhesion of magnesium hydroxide precipitate on the phytoplankton surface in the pH range 10.5 to 11. Secondly, the concentration of chlorophyll-a decreased from about 150 to 20 μg/L, with a maximum removal efficiency of 84% due to coagulation with pH values higher than 10. Thirdly, the NH4-N concentration was observed to decrease from 0.62 to 0.54 mg-N/L (13%), and the PO4-P concentration, which is a limiting factor to the formation of algae blooms, decreased from 0.27 to 0.02 mg-P/L (92%). These findings suggest that the modified flotation system can be applied for the purification of the raw water of numerous lakes containing high phytoplankton populations and elevated pH.
Keywords: Flotation process | Magnesium compounds | Micro-bubble | Microcystis aeruginosa | Nutrient salt | Zeta potential
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