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Turkish Journal of Biochemistry

Türk Biyokimya Dergisi

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1303-829X
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Effects of geometrical configurations of photobioreactors on the growth of marine benthic diatom Cylindrotheca closterium / Fotobiyoreaktörlerin geometrik konfigürasyonlarının sucul bentik diatom Cylindrotheca closterium üremesi üzerine etkisi

Esra İmamoğlu
  • Corresponding author
  • Ege University Faculty of Engineering, Department of Bioengineering, Bornova, İzmir, Turkey
  • Email:
Published Online: 2016-04-02 | DOI: https://doi.org/10.1515/tjb-2016-0017

Abstract

Objective: For algal biotechnology, the primary barrier is the developing of cost effective photobioreactor operating in a high-efficiency. In this study, the effects of three different types of photobioreactors (bag, flat plate and bubble column) on the growth and sugar production of the diatom Cylindrotheca closterium were simultaneously investigated for 7 days of batch cultivation period.

Methods: The photobioreactors were incubated at 21±2°C under the light intensity of 50 μmol photons m-2s-1 with a 12: 12 h light: dark cycle photoperiod at the air flow rate of 2 L min-1 for 7 days of batch productions. The turbidity (optical density), chlorophyll-a, exopolysaccharide (EPS) content and reducing sugar concentration were measured.

Results: The maximum specific growth rate of 0.29 day−1, which corresponded to the doubling time of 2.40 day, was obtained in the bag photobioreactor cultivation of C. closterium. It was found that the polyethylene bag photobioreactors are suitable for the production of diatoms as a closed photobioreactor.

Conclusion: The key is not only the selection of geometrical configuration of photobioreactor, but also the determination of the light penetration path for cost effective photobioreactor design operating in high efficiency related to the algal productions.

Özet

Amaç: Algal biyoteknoloji icin birincil engel, yuksek verimlilikte calışan duşuk maliyetli fotobiyoreaktor tasarımıdır. Bu calışmada, uc farklı fotobiyoreaktorde (torba, kabarcık kolon ve panel) diatom Cylindrotheca closterium icin ureme ve şeker uretimi 7 gun boyunca incelenmiştir.

Metod: Fotobiyoreaktorlerde 21±2°C sıcaklıkta, 50 μmol photons m-2s-1 ışık şiddeti altında 12: 12 saat aydınlık: karanlık dongusu ile 2 L dak-1 akış hızında 7 gunluk uretimler gercekleştirilmiştir. Optik yoğunluk, klorofil-a, ekzopolisakkarit ve indirgen şeker konsantrasyonları olculmuştur.

Bulgular: C. closterium’un torba fotobiyoreaktorde uretiminde 0.29 gun-1 olarak maksimum buyume hızına ve 2.4 gun olarak ikilenme suresine ulaşılmıştır. Polietilen torba fotobiyoreaktorlerin diatom uretimlerinde daha elverişli olduğu bulunmuştur.

Sonuç: Algal uretimlerde yuksek verimlilikte calışan duşuk maliyetli fotobiyoreaktor tasarımı icin hem fotobiyoreaktorun geometrik konfigurasyon secimi hem de ışık emilim yolunun belirlenmesi onemlidir.

Keywords: Bag; bubble column; Cylindrotheca closterium; flat plate; photobioreactor

Anahtar Kelimeler: Torba; kabarcık kolon; Cylindrotheca closterium; panel; fotobiyoreaktor

About the article

Received: 2015-10-03

Accepted: 2015-12-22

Published Online: 2016-04-02

Published in Print: 2016-04-01



Citation Information: Turkish Journal of Biochemistry, ISSN (Online) 1303-829X, ISSN (Print) 0250-4685, DOI: https://doi.org/10.1515/tjb-2016-0017. Export Citation

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