Rapid harvesting of freshwater microalgae using chitosan

Effect of eggshells for the harvesting of microalgae species

“…The maximum separation efficiency (99 § 0.4%) was observed with an eggshell dose of >80 mg/L, whereas the lowest efficiency (50 § 2%), with a dose of 20 mg/L (Figure 4). Thus, the maximum separation efficiency achieved using our experimental design exceeds the 60% reported by Papazi et al [24] in Chlorella minutissima, using a comparatively high dose of chemical coagulants, i.e., 1000 mg/L of Al 2 (SO 4 ) 3 , and incubation time of 6 h. A 99% harvesting efficiency of C. vulgaris similar to that achieved in our experiments was also observed by Rashid et al [8] at pH 6, but using a higher dose (120 mg/L) of chitosan than the 80 mg/L of eggshells applied by us.…”

“…[10,14] The increase in flocculation efficiency at high pH observed by some authors is probably due to some autoflocculation of microalgae, which occurs at pH 10 or even higher. [8,9] As an alternative to the use of eggshells; an increase in the pH by intense microalgae photosynthesis may be considered. In cultures of C. vulgaris, Vandamme et al [21] observed that flocculation occurred when CO 2 supply was interrupted and pH was increased to 9.5 as a result of photosynthesis.…”

“…It has been calculated that up to 20%À30% of the total production costs are due to the biomass recovery stage. [8] Therefore, an efficient/cost effective technique for harvesting of microalgae is required to be developed. This could significantly reduce the input cost of biodiesel production.…”

Sustainable Agriculture in the Arabian/Persian Gulf Region Utilizing Marginal Water Resources: Making the Best of a Bad Situation

“…Coagulation-flocculation could also be used to harvest some microalgae. Bio-based coagulants (e.g., chitosan, poly γ-glutamic acid and rice starch) have been found effective in harvesting freshwater microalgae [104][105][106]. Since the marine microalgae cultures usually have much higher ionic strength compared to that of freshwater cultures, these organic coagulants are often less effective for harvesting marine microalgae; polyvalent metal coagulants (e.g., alum, ferric chloride) are often used to harvest marine microalgae.…”

A Comparative Study on Microalgae Recovery Rates in Response to Different Low Cost Bio-flocculant Applications

“…이에 따라 많은 국가에서는 환경친화적이고 지속 가 능한 새로운 에너지원의 개발에 관심을 돌리고 있다. 신재 생 에너지의 다양한 잠재적인 소스 중에서 가장 관심을 받 고 있는 바이오에너지는 미래의 글로벌 에너지 인프라에 결정적인 역할을 할 것으로 기대된다 (Choi, 2015;Rashid et al, 2013). 가장 일반적으로 사용되는 바이오 연료 중 하나인 바이오 디젤은 상용 가능한 주요 에너지원으로써 현재 가장 이상적인 재활용 에너지원으로 인식되고 있다.…”