Flocculation Characteristics of Microalgae Using Chemical Flocculants

권도연,; 정창규,; 박광범,; 이철균,; 이진원,

doi:10.7841/ksbbj.2011.26.2.143

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…기 응집제의 사용량을 최소화 함으로써 응집제 사용시 발생 되는 pH감소를 최소화할 필요가 있다 [13]. 따라서 본 연구에서는 최소한의 무기 응집제의 사용으로 최대의 응집 효율을 얻기 위해 response surface methodology (RSM)를 이용한 미세조류의 최적 응집조건을 구축하는 연 구개발을 수행하였다.…”

Section: Introductionunclassified

Optimization of Spirogyra Flocculation Using Polyaluminium Chloride

Baek¹,

Choi²

2014

KSBB Journal

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Flocculation is known one of the effective methods for harvesting microalgae. This study was aimed to optimize the flocculation condition for decreasing the amounts of flocculant and obtaining the highest yield of algal biomass. To achieve this goal, it was optimized the flocculant concentration, reaction pH and the concentration of cell density for harvest using response surface methodology (RSM). The flocculation of microalgae, Spirogyra varians, was carried out using inorganic flocculant polyaluminium chloride. By the RSM result, the optimal flocculation condition was calculated 5 ppm of polyaluminum chloride, pH 7.5 and 0.33 of optical cell density at OD 640 . The obtained recovery yield of S. varians was 97.6% at the optimal condition.

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Section: Introductionunclassified

Optimization of Spirogyra Flocculation Using Polyaluminium Chloride

Baek¹,

Choi²

2014

KSBB Journal

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“…6) 응결체를 형성하면 침강 효과가 증가할 것으로 예상하고 이것을 실험적으로 확인하고자 했다. 반면에, 양전하 크기 는 동일하지만 이온반경이 서로 다르고 가수분해가 잘 일 어나지 않는 La 3+ 및 Ho 3+ 금속이온들을 응집제로 사용하 Beer-Lambert 법칙에 의거하여 농도간의 선형적인 관계식에 의하여 농도로 환산한 후 응 결정도를 응결효율로 정의해서 다음과 같은 식에 의하여 계산하였다 8,9).…”

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Studies on the Flocculation of Algae with Metal Ions

Park¹,

Lee²,

Cho³

2015

Journal of Korean Society of Environmental Engineers

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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 Al 3+ > La 3+ > Ho 3+ > Fe 2+ > Ca 2+. 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 Al 3+ > Ho 3+ > La 3+ ≫ Mg 2+ ≥ Ca 2+ ≫ K +. At a constant metal concentration, zeta potentials were measured with increasing cyanobacteria concentration, showing that zeta potentials for K + , Mg 2+ and Ca 2+ ions were negligibly changed, whereas those of Ho 3+ and La 3+ ions were decreased. Moreover, the effect of Ho 3+ ion on decreasing zeta potential was smaller than that of La 3+ ion. Al 3+ ions showed quite a different behavior that with increasing cyanobacteria concentration the zeta potentials increased and decreased thereafter. Hydrolysis of Al 3+ ions caused a difficulty to investigate coagulation or flocculation of cyanobacteria by measurement of zeta potentials.

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“…이전 연구결과에서 Aluminium 계열, Ferric계열의 무기 응집제 사용 시 해양 미세조류 높은 응집 효율을 얻을 수 있었다 [13]. 하지만 Aluminium은 Alzheimer 를 유발하는 것으로 알려져 있다 [14][15][16] 해양 미세조류인 Chlorella ellipsoidea의 경우 이전 연구 에서 응집제 중에서 1 g 당 응집 효율이 가장 높았던 Ferric chloride를 선택하였다 [13].…”

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Flocculation Characteristics of Microalgae Through Combined Flocculants

Kwon¹,

Jung²,

Lee³

et al. 2011

KSBB Journal

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1) In this study, inorganic flocculant with biodegradable polymer flocculant was usedfor microalgae harvest. The aim of this study was to optimize the concentration of inorganic flocculant, the concentration of biodegradable polymer flocculant and reaction volume for decreasing the amounts of flocculant and obtaining the suitable pH range for seawater by response surface methodology. The flocculation of three marine microalgae, Chlorella ellipsoidea, Dunaliella bardawil, and Dunaliella tertiolecta, using inorganic flocculants and biodegradable polymer flocculants was investigated. The results indicated that the optimal flocculant quantity showed 0.1 g/L of ferric chloride, 7.5 g/L of chitosan on Chlorella ellipsoidea. In the case of Dunaliella bardawil, the optimal flocculant quantity showed amount of ferric sulfate more than 0.12 g/L and chitosan more than 0.75 g/L. In the case of Dunaliella tertiolecta, the optimal flocculant quantity showed 1.0 g/L of sodium aluminate, 0.75 g/L of chitosan.

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Flocculation Characteristics of Microalgae Using Chemical Flocculants

Cited by 6 publications

References 17 publications

Optimization of Spirogyra Flocculation Using Polyaluminium Chloride

Optimization of Spirogyra Flocculation Using Polyaluminium Chloride

Studies on the Flocculation of Algae with Metal Ions

Flocculation Characteristics of Microalgae Through Combined Flocculants

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