Flow behavior analysis of Chlorella Vulgaris microalgal biomass

In this research, the effect of solar irradiance on Chlorella vulgaris cultivated in open bioreactors under greenhouse conditions was investigated, as well as of ratio of light intensity in the 420–520 nm range to light in the 580–680 nm range (I420–520/I580–680) and of artificial irradiation provided by red and white LED lamps in a closed flat plate laboratory bioreactor on the growth rate and composition. The increase in solar irradiance led to faster growth rates (μexp) of C. vulgaris under both environmental conditions studied in the greenhouse (in June up to 0.33 d−1 and in September up to 0.29 d−1) and higher lipid content in microalgal biomass (in June up to 25.6% and in September up to 24.7%). In the experiments conducted in the closed bioreactor, as the ratio I420–520/I580–680 increased, the specific growth rate and the biomass, protein and lipid productivities increased as well. Additionally, the increase in light intensity with red and white LED lamps resulted in faster growth rates (the μexp increased up to 0.36 d−1) and higher lipid content (up to 22.2%), while the protein, fiber, ash and moisture content remained relatively constant. Overall, the trend in biomass, lipid, and protein productivities as a function of light intensity was similar in the two systems (greenhouse and bioreactor).

Download Full-text

Study of Chlorella vulgaris sedimentation process

MATEC Web of Conferences ◽

10.1051/matecconf/201824005023 ◽

2018 ◽

Vol 240 ◽

pp. 05023 ◽

Cited By ~ 2

Author(s):

Agnieszka Patyna ◽

Małgorzata Płaczek ◽

Stanisław Witczak

Keyword(s):

Chlorella Vulgaris ◽

Dry Mass ◽

Separation Process ◽

Cultivation Condition ◽

Microalgal Biomass ◽

Algae Biomass ◽

Algae Cultivation ◽

Sedimentation Process ◽

Microalgae Harvesting

The paper reports the results of Chlorella vulgaris sedimentation process including description of cultivation condition of microalgal biomass. The process of algae cultivation was carried out in photobioreactor comprising systems of carbon dioxide supply, mixing and artificial LED illumination. The growth of microalgae was determined alternatively in three ways by measuring the amount of dry mass over time, counting the cells and measurement of optical density by use of a spectrophotometer. Algae biomass with different concentration was subjected to the separation process by gravity. This led to the determination of the characteristic of sedimentation process for different concentrations and cell sizes. The experimental results indicate that sedimentation process offers a tool with a potential application for microalgae harvesting.

Download Full-text

Flow Behavior Analysis of Emc in Molded Underfill (Muf) Encapsulation for Multi Flip-Chip Package

Journal of Physics Conference Series ◽

10.1088/1742-6596/1082/1/012015 ◽

2018 ◽

Vol 1082 ◽

pp. 012015

Author(s):

M.A. Azmi ◽

M.K. Abdullah ◽

M.Z. Abdullah ◽

Z.M. Ariff ◽

M.A. Ismail ◽

...

Keyword(s):

Behavior Analysis ◽

Flip Chip ◽

Flow Behavior

Download Full-text

Graph analysis of network flow connectivity behaviors

TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES ◽

10.3906/elk-1808-148 ◽

2019 ◽

pp. 861-877

Author(s):

HANGYU HU ◽

XUEMENG ZHAI ◽

MINGDA WANG ◽

GUANGMIN HU

Keyword(s):

Behavior Analysis ◽

Network Flow ◽

Graph Mining ◽

Network Flows ◽

Flow Behavior ◽

Edge Weight ◽

Event Identification ◽

Node Ranking ◽

Graph Simplification ◽

Network Event

Graph-based approaches have been widely employed to facilitate in analyzing network flow connectivity behaviors, which aim to understand the impacts and patterns of network events. However, existing approaches suffer from lack of connectivity-behavior information and loss of network event identification. In this paper, we propose network flow connectivity graphs (NFCGs) to capture network flow behavior for modeling social behaviors from network entities. Given a set of flows, edges of a NFCG are generated by connecting pairwise hosts who communicate with each other. To preserve more information about network flows, we also embed node-ranking values and edge-weight vectors into the original NFCG. After that, a network flow connectivity behavior analysis framework is present based on NFCGs. The proposed framework consists of three modules: a graph simplification module based on diversified filtering rules, a graph feature analysis module based on quantitative or semiquantitative analysis, and a graph structure analysis module based on several graph mining methods. Furthermore, we evaluate our NFCG-based framework by using real network traffic data. The results show that NFCGs and the proposed framework can not only achieve good performance on network behavior analysis but also exhibit excellent scalability for further algorithmic implementations.

Download Full-text

Nonideal Flow Behavior Analysis of Atmospheric Thermal Silicon Oxidation Reactors by the Residence Time Distribution Technique

Journal of The Electrochemical Society ◽

10.1149/1.2085993 ◽

1991 ◽

Vol 138 (8) ◽

pp. 2451-2459 ◽

Cited By ~ 3

Author(s):

Ara Philipossian ◽

Kenneth Van Wormer

Keyword(s):

Behavior Analysis ◽

Residence Time ◽

Time Distribution ◽

Residence Time Distribution ◽

Flow Behavior ◽

Silicon Oxidation

Download Full-text

Scaling-up sustainable Chlorella vulgaris microalgal biomass cultivation from laboratory to pilot-plant photobioreactor, towards biofuel

Global NEST Journal ◽

10.30955/gnj.002777 ◽

2018 ◽

Vol 21 (1) ◽

pp. 37-42 ◽

Cited By ~ 1

Keyword(s):

Chlorella Vulgaris ◽

Pilot Plant ◽

Specific Growth ◽

Scaling Up ◽

Microalgal Biomass ◽

Microalgal Cultivation ◽

The Poor ◽

Microalgal Culture ◽

Mode Of Operation ◽

Specific Growth Factor

<p>Unicellular microalgal culture represents a new opportunity for producing significant biofuel quantities in the future along with other specialty products, due to several major advantages microalgae species present when compared to conventional crops, including much faster growth rates, cultivation in a variety of environments and photobioreactor systems, and almost 100% recycling of nutrients. In the current research, the scaling-up of the cultivation of Chlorella vulgaris microalgae to a 4 m3 pilot-plant photobioreactor is examined, compared to the performance of a 25 L automated laboratory bioreactor. Beyond the size and configuration, the main differences of the two bioreactors are the mode of operation, the illumination nature and depth, the temperature, and pH. Specifically, temperature and illumination are naturally varying from day to day and season to season into the pilot-plant photobioreactor that is set inside a greenhouse. The specific growth factor appears to be higher for microalgal cultivation in the laboratory bioreactor. It is also found that the growth kinetics is severely slowed down during the winter months. This is primarily due to the low temperatures and the poor illumination observed during winter.</p>

Download Full-text

Development of an Organic Culture Medium for Autotrophic Production of Chlorella vulgaris Biomass

Applied Sciences ◽

10.3390/app10062156 ◽

2020 ◽

Vol 10 (6) ◽

pp. 2156

Author(s):

Adriana Machado ◽

Hugo Pereira ◽

Margarida Costa ◽

Tamára Santos ◽

Bernardo Carvalho ◽

...

Keyword(s):

Growth Performance ◽

Chlorella Vulgaris ◽

Culture Medium ◽

Bubble Column ◽

Organic Medium ◽

Organic Substrates ◽

Microalgal Biomass ◽

Organic C ◽

Certified Organic ◽

Organic Culture

Microalgal biomass has gained increasing attention in the last decade for various biotechnological applications, including human nutrition. Certified organic products are currently a growing niche market in which the food industry has shown great interest. In this context, this work aimed at developing a certified organic culture medium for the production of autotrophic Chlorella vulgaris biomass. A preliminary assay in 2 L bubble column photobioreactors was performed in order to screen different commercial organic substrates (OS) at a normalized concentration of N (2 mmol L−1). The highest growth performance was obtained using EcoMix4 and Bioscape which showed similar biomass concentrations compared to the synthetic culture medium (control). In order to meet the nutrient needs of Chlorella, both OS underwent elemental analyses to assess their nutrient composition. The laboratory findings allowed the development of a final organic culture medium using a proportion of Bioscape/EcoMix4 (1:1.2, m/m). This organic culture medium was later validated outdoors in 125 L flat panel and 10 m3 tubular flow through photobioreactors. The results obtained revealed that the developed organic medium led to similar microalgal growth performance and biochemical composition of produced biomass, as compared to the traditional synthetic medium. Overall, the formulated organic medium was effective for the autotrophic production of organic C. vulgaris biomass.

Download Full-text