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Cultivation of Chlorella Vulgaris Using Airlift Photobioreactor Sparged with 5%CO2-Air as a Biofixing Process
زراعة الكلوريلا فيلغارس في مفاعل الايرلفت مع ضخ خليط 5 %- CO2هواء كعملية تثبيت بايلوجية

Authors: Mahmood Khazzal Hummadi AL-Mashhadani محمود خزعل حمادي --- Entisar Mohsin Khudhair انتصار محسن خضير
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2017 Volume: 23 Issue: 4 Pages: 22-41
Publisher: Baghdad University جامعة بغداد

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Abstract

The present paper addresses cultivation of Chlorella vulgaris microalgae using airlift photobioreactor that sparged with 5% CO2/air. The experimental data were compared with that obtained from bioreactor aerated with air and unsparged bioreactor. The results showed that the concentration of biomass is 0.36 g l-1 in sparged bioreactor with CO2/air, while, the concentration of biomass reached to 0.069 g l-1 in the unsparged bioreactor. They showed also that aerated bioreactor with CO2/air gives more biomass production even the bioreactor was aerated with air. This study proved that application of sparging system for cultivation of Chlorella vulgaris microalgae using either CO2/air mixture or air has a significant growth rate, since the bioreactors become more thermodynamically favorable and provide impetus for a higher level of production.

البحث الحالي يتناول دراسة زراعة طحالب الكلوريلا فيلغارس باستخدام مفاعل حيوي ضوئي الايرليفت بتهوية خليط من 5٪ CO2 / الهواء. وتم مقارنة البيانات التجريبية مع التي تم الحصول عليها من مفاعل حيوي ضخ مع الهواء النقي فقط ومفاعل حيوي اخر بدون تهويه. النتائج أظهرت أن تركيز الكتلة الحيوية هو 0.36 g l-1 في مفاعل حيوي مع خليط من CO2 / الهواء، في حين، تركيز الكتلة الحيوية وصلت إلى g l-1 0.069 في مفاعل حيوي بدون تهوية. هذه النتائج اثبتت أن مفاعل حيوي التي ضخ اليه خليط من CO2 / الهواء يعطي مزيدا من إنتاج الكتلة الحيوية من الزراعة في مفاعل حيوي ضخ اليه الهواء فقط .أثبتت هذه الدراسة أن تطبيق نظام التهوية لتفعيل نمو طحالب الكلوريلا فيلغارس باستخدام خليط من CO2 / الهواء أو الهواء النقي فقط يعطي معدل نمو كبير، لأن المفاعلات الحيوية تصبح أكثر ملاءمة للديناميكية الحرارية وتوفر حافزا لمستوى أعلى من الإنتاج.


Article
Experimental Study for Commercial Fertilizer NPK (20:20:20+TE N: P: K) in Microalgae Cultivation at Different Aeration Periods

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Abstract

Recently, microalgae have become a promising source in the production of biofuel. However, the cost of production is still the main obstacle to develop of this type of source. Although there are many extensive studies on the requirements provided for the cultivation of the microalgae, the study of the process, via the variables that affect the cultivation of microalgae, being still one of the important tasks to improve the production of biofuel. The present article is a serious attempt to investigate of use commercial fertilizer NPK (20:20:20+TE N: P: K) as considered a cheap nutrient medium in growth Chlorella vulgaris by comparison with traditional nutrient (Chu.10 medium). In addition, the current study addresses effect of different sparging periods of filtered air on the microalgae production. The experimental data showed that the use of the NPK fertilizer as cultivation medium in Chlorella vulgaris culture gives more growth rate of microalgae than that produced if the cultivation process was operated with Chu.10 medium. For example the maximum biomass concentration reaches to 0.3249 g L-1 when cultivated in NPK fertilizer, whereas reached to 0.212 g L-1 for cells cultivated in Chu.10 medium. In addition, the results proved that the aeration system in the cultivation can plays an important role in the activity of the microalgae with NPK medium, since it creates a convenient environment with low concentration of oxygen in the medium. The study showed that increasing aeration period for such a type of microalgae increases the growth rate.

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