Flocculation Characteristics of Microalgae Through Combined Flocculants

Abstract

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.

Studies on the Flocculation of Algae with Metal Ions

“…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).…”