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J Korean Soc Environ Eng > Volume 37(8); 2015 > Article
J Korean Soc Environ Eng 2015;37(8): 441-449. doi: https://doi.org/10.4491/KSEE.2015.37.8.441
금속이온에 의한 조류 응결에 관한 연구
박영재1, 이상수2, 조혜륜3
1호서대학교 생명공학전공
2배재대학교 생명공학과
3한국원자력연구원 원자력화학연구부
Studies on the Flocculation of Algae with Metal Ions
Yeong Jae Park1, Sang Soo Lee2, Hye Ryun Cho3
1Department of Biotechnology, Hoseo University
2Department of Life Science and Technology, Pai Chai University
3Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute
Corresponding author  Yeong Jae Park ,Tel: 041-540-9641, Fax: 041-540-6231, Email: nyjpark@naver.com
Received: July 7, 2015;  Revised: August 12, 2015;  Accepted: August 24, 2015.  Published online: August 31, 2015.
Studies on the flocculation of algae using various metal ions were carried out by measurements of optical density(OD) and zeta potential. Cyanobacteria were used as algaes. Flocculation efficiencies of cyanobacteria by an addition of metal ions were determined from OD values, and the effect of metal ions was greater in the order of Al3+ > La3+ > Ho3+ > Fe2+ > Ca2+. Especially for trivalent metal ions, percentages of metal removed from cyanobacteria solutions on flocculation were measured, showing the same order as in flocculation efficiencies. Zeta potentials of cyanobacteria alone were measured with increasing the concentration, found to be all negative voltages, and were increased with increasing the concentration. The effect of pH on zeta potential of cyanobacteria solution was investigated. Below pH 5.5, the zeta potentials were steeply decreased with increasing pH, whereas in the range of 5.5 ≤ pH ≤ 10 they were almost constant (-46±1 mV) even with increasing pH. At a constant concentration of cyanobacteria (A730=0.25), an increase in concentration of metal ions caused an increase in zeta potential of cyanobacteria solution, showing that the effect was greater in the order of Al3+ > Ho3+ > La3+ ≫ Mg2+ ≥ Ca2+ ≫ K+. At a constant metal concentration, zeta potentials were measured with increasing cyanobacteria concentration, showing that zeta potentials for K+, Mg2+ and Ca2+ ions were negligibly changed, whereas those of Ho3+ and La3+ ions were decreased. Moreover, the effect of Ho3+ ion on decreasing zeta potential was smaller than that of La3+ ion. Al3+ ions showed quite a different behavior that with increasing cyanobacteria concentration the zeta potentials increased and decreased thereafter. Hydrolysis of Al3+ ions caused a difficulty to investigate coagulation or flocculation of cyanobacteria by measurement of zeta potentials.
Key Words: Algae, Cyanobacteria, Coagulation, Flocculation, Zeta Potential
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