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1. Current Bottlenecks and Challenges of the Microalgal Biorefinery

Author:
Gifuni, Imma; Pollio, Antonino; Safi, Carl; Marzocchella, Antonio; Olivieri, Giuseppe
Source:
Trends in biotechnology 2019 v.37 no.3 pp. 242-252
ISSN:
0167-7799
Subject:
algae culture,   etc   ; biorefining; feedstocks; lipids; microalgae;     Show all 5 Subjects
Abstract:
... Microalgae are increasingly considered as sources of renewable feedstocks for industrial production, and microalgae production now focuses on the multiproduct microalgal biorefinery. However, such a biorefinery presents several bottlenecks that are mainly associated with downstream processes. This reduced downstream efficiency results from unsolved problems related to the culture strategy for the ...
DOI:
10.1016/j.tibtech.2018.09.006

2. Cultivation of Chlorella pyrenoidosa in anaerobic wastewater: The coupled effects of ammonium, temperature and pH conditions on lipids compositions

Author:
Zhao, Xian-Chao; Tan, Xiao-Bo; Yang, Li-Bin; Liao, Jian-Yu; Li, Xiao-Yong
Source:
Bioresource technology 2019 v.284 pp. 90-97
ISSN:
0960-8524
Subject:
algae culture,   etc   ; Chlorella pyrenoidosa; ammonia; ammonium; microalgae; pH; temperature; wastewater;     Show all 8 Subjects
Abstract:
... Anaerobic wastewater potentially was an ideal medium for cultivating microalgae. The coupled effect of ammonium, temperature and pH on lipids accumulation was a core issue during algal culture using anaerobic wastewater. Therefore, their combined effects on Chlorella pyrenoidosa culture and lipids accumulation in anaerobic effluent were investigated. Free ammonia induced from the rising pH and tem ...
DOI:
10.1016/j.biortech.2019.03.117

3. Influence of successive and independent arrangement of Kenics mixer units on light/dark cycle and energy consumption in a tubular microalgae photobioreactor

Author:
Qin, Chao; Wu, Jing
Source:
Algal research 2019 v.37 pp. 17-29
ISSN:
2211-9264
Subject:
algae culture,   etc   ; energy; fluid mechanics; microalgae; mixers; photobioreactors;     Show all 6 Subjects
Abstract:
... The design of mixers in tubular photobioreactors is a key part to reduce the cost of microalgal culture. There have been several investigations of the static Kenics mixer in tubular photobioreactors, but how to use it efficiently has been rarely reported. In this work, the efficiency of light/dark cycle enhancement, defined as the ratio of the dimensionless increment of light/dark cycle frequency ...
DOI:
10.1016/j.algal.2018.09.020

4. Correction to: High-value biomass from microalgae production platforms: strategies and progress based on carbon metabolism and energy conversion

Author:
Sun, Han; Zhao, Weiyang; Mao, Xuemei; Li, Yuelian; Wu, Tao; Chen, Feng
Source:
Biotechnology for biofuels 2018 v.11 no.1 pp. 254
ISSN:
1754-6834
Subject:
algae culture,   etc   ; biomass; carbon metabolism; energy conversion;     Show all 4 Subjects
Abstract:
... Following publication of this article [1] the authors noted that there is a redundant icon in Fig. 1. A replacement can be found in Fig. 1. ...
DOI:
10.1186/s13068-018-1253-2

5. Model predictive control coupled with economic and environmental constraints for optimum algal production

Author:
Juneja, Ankita; Murthy, Ganti S.
Source:
Bioresource technology 2018 v.250 pp. 556-563
ISSN:
0960-8524
Subject:
algae culture,   etc   ; biofuels; microalgae; models; ponds; temperature;     Show all 6 Subjects
Abstract:
... Algae production process is a key cost center in production of biofuels/bioproducts from microalgae. Decline in the growth of algae in outdoor ponds during non-optimal conditions is one of the hurdles for achieving consistently high algal production rates. An optimal controller can be used to overcome this limitation and provide reliable growth in outdoor conditions. A model predictive controller ...
DOI:
10.1016/j.biortech.2017.11.047

6. Continuous cultivation of Arthrospira platensis for phycocyanin production in large-scale outdoor raceway ponds using microfiltered culture medium

Author:
Yu, Jiajia; Hu, Hancui; Wu, Xiaodan; Wang, Congchun; Zhou, Ting; Liu, Yuhuan; Ruan, Roger; Zheng, Hongli
Source:
Bioresource technology 2019 v.287 pp. 121420
ISSN:
0960-8524
Subject:
algae culture,   etc   ; Arthrospira platensis; bacteria; biomass production; culture media; microalgae; microbial communities; microfiltration; photosynthesis; phycocyanin; ponds;     Show all 11 Subjects
Abstract:
... In the present study, the effect of filtrating algal culture medium for reuse by using microfiltration membranes on microalgal growth, microbiological contamination, and phycocyanin production of Arthrospira platensis was investigated. Results showed that microfiltered culture medium affected microalgal growth, microbiological contamination, and phycocyanin production of A. platensis significantly ...
DOI:
10.1016/j.biortech.2019.121420

7. Continuous non-destructive hydrocarbon extraction from Botryococcus braunii BOT-22

Author:
Mehta, Preeti; Jackson, Brent A.; Nwoba, Emeka G.; Vadiveloo, Ashiwin; Bahri, Parisa A.; Mathur, Anshu S.; Moheimani, Navid R.
Source:
Algal research 2019 v.41 pp. 101537
ISSN:
2211-9264
Subject:
algae culture,   etc   ; Botryococcus braunii; biofuels; biomass; cost effectiveness; culture flasks; microalgae; oils; solvents; toxicity; viability;     Show all 11 Subjects
Abstract:
... In-situ extraction of microalgal oil without cell destruction has been proposed as a cost-effective alternative solution for the production of algal biofuel. This study examines the viability and efficiency of n-dodecane in both column and shake flask systems for the continuous extraction of botryococcene from Botryococcus braunii (BOT-22). Botryococcene from B. braunii was found to be non-destruc ...
DOI:
10.1016/j.algal.2019.101537

8. Self-rotary propellers with clockwise/counterclockwise blades create spiral flow fields to improve mass transfer and promote microalgae growth

Author:
Kumar, Santosh; Cheng, Jun; Guo, Wangbiao; Ali, Kubar Ameer; Song, Yanmei
Source:
Bioresource technology 2019 v.286 pp. 121384
ISSN:
0960-8524
Subject:
algae culture,   etc   ; Arthrospira platensis; biomass; mass transfer; microalgae; mixing; photochemistry; ponds; propellers; shear stress; trichomes;     Show all 11 Subjects
Abstract:
... In this work, self-rotary propellers (SRPs) with clockwise/counterclockwise blades were investigated to create spiral flow fields without external power to strengthen gas-liquid mixing and promote microalgal growth in an open raceway pond. The rotational flow around the propellers and spiral flow between the propellers generated extensive wall shear stress in three dimensions. Four-clockwise blade ...
DOI:
10.1016/j.biortech.2019.121384

9. The reclassification of 37 strains from The Mosonmagyaróvár Algal Culture Collection, Hungary, which were previously identified as Anabaena (Cyanobacteria, Nostocaceae)

Author:
Horváth, N.; Katona, S.; Berthold, D.E.; Molnár, Z.; Bálint, P.; Ördög, V.; Pap, B.; Maróti, G.; Bánáti, F.; Szenthe, K.; Vörös, L.; Kilgore, C.; Laughinghouse, H.D.
Source:
South African journal of botany 2019 v.123 pp. 333-340
ISSN:
0254-6299
Subject:
algae culture,   etc   ; Anabaena; Nostoc; freshwater; phylogeny; ribosomal RNA; species identification; taxonomic revisions; Hungary;     Show all 9 Subjects
Abstract:
... Study on 37 MACC isolates previously identified as “Anabaena,” a freshwater filamentous heterocytous taxon, were carried out using the 16S rRNA. The study found that most of the strains were misidentified at genus level. Three clusters of phylogenetically and morphologically similar taxa were identified. The previous determinations were amended with their new taxonomic classifications (partly due ...
DOI:
10.1016/j.sajb.2019.03.014

10. Bacterial community enhances flocculation efficiency of Ettlia sp. by altering extracellular polymeric substances profile

Author:
Vu, Chau Hai Thai; Chun, Seong-Jun; Seo, Seong-Hyun; Cui, Yingshun; Ahn, Chi-Yong; Oh, Hee-Mock
Source:
Bioresource technology 2019 v.281 pp. 56-65
ISSN:
0960-8524
Subject:
algae culture,   etc   ; Ettlia; axenic culture; bacteria; bacterial communities; biomass; flocculation; microscopy; polymers; quantitative analysis;     Show all 10 Subjects
Abstract:
... This study examined the effects of a bacterial community and extracellular polymeric substances (EPS) on Ettlia sp. flocculation. The growth rate, flocculation efficiency (FE), bacterial community, and EPS profile of axenic and xenic Ettlia cultures were monitored during 46 days of cultivation. For the xenic culture, with a great abundance of growth-promoting and flocculation-inducing bacteria, th ...
DOI:
10.1016/j.biortech.2019.02.062

11. Design scenario analysis for porous substrate photobioreactor assemblies

Author:
Li, Tong; Podola, Björn; Schultze, Larissa K. P.; Melkonian, Michael
Source:
Journal of applied phycology 2019 v.31 no.3 pp. 1623-1636
ISSN:
0921-8971
Subject:
algae culture,   etc   ; Haematococcus pluvialis; astaxanthin; biofilm; light intensity; mathematical models; photobioreactors; prediction; solar radiation;     Show all 9 Subjects
Abstract:
... For commercial-scale production of microalgae, in the recent years, biofilm bioreactors have been proven to solve some of major technical problems in this field. Among different approaches, porous substrate photobioreactor (PSBR) is one of the most promising bioreactor types. However, before the actual construction of such a system and application, various design parameters need to be determined. ...
DOI:
10.1007/s10811-018-1700-2

12. Heterotrophic microalgae production on food waste and by-products

Author:
Ende, Stephan S. W.; Noke, Anja
Source:
Journal of applied phycology 2019 v.31 no.3 pp. 1565-1571
ISSN:
0921-8971
Subject:
algae culture,   etc   ; bioavailability; byproducts; carbon; chemical composition; energy; food waste; industrial wastes; microalgae; molasses; production costs;     Show all 11 Subjects
Abstract:
... The present review provides an overview of the latest research on microalgae production techniques based on carbon instead of light as energy source. The independence of light in mixotrophic and heterotrophic cultivation considerably reduces production costs and space compared to autotrophic production. Hence, this production technique may play a key role to meet future increasing food and feed de ...
DOI:
10.1007/s10811-018-1697-6

13. Heterotrophic cultivation of T. obliquus under non-axenic conditions by uncoupled supply of nitrogen and glucose

Author:
Di Caprio, Fabrizio; Altimari, Pietro; Iaquaniello, Gaetano; Toro, Luigi; Pagnanelli, Francesca
Source:
Biochemical engineering journal 2019 v.145 pp. 127-136
ISSN:
1369-703X
Subject:
algae culture,   etc   ; bacteria; bacterial contamination; biomass production; glucose; microalgae; nitrates; nitrogen;     Show all 8 Subjects
Abstract:
... A fed-batch strategy is proposed to produce microalgae biomass under non-axenic heterotrophic conditions. The strategy induces the alternation of N-deplete (Glucose-replete) and N-replete (Glucose-deplete) cultivation phases by the periodic and uncoupled supply of glucose and NO3− to the culture. Cultivation of the microalga T. obliquus with this strategy reduced the ratio of the bacteria to micro ...
DOI:
10.1016/j.bej.2019.02.020

14. Cultivation of Chlorella vulgaris in sludge extracts: Nutrient removal and algal utilization

Author:
Wang, Lu; Addy, Min; Lu, Qian; Cobb, Kirk; Chen, Paul; Chen, Xiurong; Liu, Yuhuan; Wang, Hualin; Ruan, Roger
Source:
Bioresource technology 2019 v.280 pp. 505-510
ISSN:
0960-8524
Subject:
algae culture,   etc   ; Chlorella vulgaris; algae; biomass; harvesting; nutrients; saturated fatty acids; sludge; unsaturated fatty acids;     Show all 9 Subjects
Abstract:
... In order to utilize the excess sludge and reduce the cost of algal cultivation, Chlorella vulgaris was cultivated in increasing proportions of sludge extracts for simultaneous nutrients removal and algal utilization. Results showed that C. vulgaris cultivated in the 100% sludge extract gained the highest total biomass (33.98 ± 0.30 × 106 cells/mL) and showed good results in TOC (absolute value 175 ...
DOI:
10.1016/j.biortech.2019.02.017

15. Microalgal lipids production and nutrients recovery from landfill leachate using membrane photobioreactor

Author:
Chang, Haixing; Fu, Qian; Zhong, Nianbing; Yang, Xin; Quan, Xuejun; Li, Shuo; Fu, Jingwei; Xiao, Chao
Source:
Bioresource technology 2019 v.277 pp. 18-26
ISSN:
0960-8524
Subject:
algae culture,   etc   ; biomass; combustion; landfill leachates; linolenic acid; microalgae; nutrients; phosphates; photobioreactors;     Show all 9 Subjects
Abstract:
... The aim of this work was to realize high-efficiency nutrients recovery from landfill leachate (LL) for microalgal lipids production. Negative effects of LL on microalgal lipid synthesis was revealed and a scalable membrane-based tubular photobioreactor (SM-PBR) was proposed to offset these negative effects. Microalgal biomass concentration was improved from 0 g/L in the traditional PBR to 2.13 g/L ...
DOI:
10.1016/j.biortech.2019.01.027

16. Molecular taxonomic evaluation of 40 Anabaena and 40 Nostoc isolates from the third largest European soil microalgal culture collection

Author:
Makra, N.; Gell, G.; Juhász, A.; Soós, V.; Kiss, T.; Molnár, Z.; Ördög, V.; Vörös, L.; Balázs, E.
Source:
South African journal of botany 2019
ISSN:
0254-6299
Subject:
algae culture,   etc   ; Anabaena; Nostoc; algorithms; monophyly; nucleotide sequences; paraphyly; ribosomal RNA; soil; taxonomy;     Show all 10 Subjects
Abstract:
... The taxonomy of genera Anabaena and Nostoc is very controversial. They are typically paraphyletic within phylogenetic trees and show similar morphological characters. Our study aimed to determine the taxonomic relationships among Anabaena and Nostoc isolates of the Mosonmagyaróvár Algal Culture Collection (MACC) using 16S rRNA and rbcLX gene sequences. We concluded on the basis of the number of un ...
DOI:
10.1016/j.sajb.2019.03.008

17. Characterization of bubble column photobioreactors for shear-sensitive microalgae culture

Author:
López-Rosales, Lorenzo; Sánchez-Mirón, Asterio; Contreras-Gómez, Antonio; García-Camacho, Francisco; Battaglia, Francine; Zhao, Lei; Molina-Grima, Emilio
Source:
Bioresource technology 2019 v.275 pp. 1-9
ISSN:
0960-8524
Subject:
algae culture,   etc   ; Miozoa; algae; carbon dioxide; energy; headspace analysis; hydrodynamics; liquids; mass transfer; photobioreactors;     Show all 10 Subjects
Abstract:
... The shear-sensitive marine algal dinoflagellate Karlodinium veneficum was grown in a cylindrical bubble column photobioreactor with an internal diameter of 0.044 m. Initial liquid height varied from 0.5 to 1.75 m, superficial gas velocities from 0.0014 to 0.0057 ms−1, and nozzle diameter from 1 to 2.5 mm. Computational fluid dynamics was used to characterize the flow hydrodynamics and energy dissi ...
DOI:
10.1016/j.biortech.2018.12.009

18. Enhancing algal biomass and lipid production through bacterial co-culture

Author:
Berthold, David Erwin; Shetty, Kateel G.; Jayachandran, Krishnaswamy; Laughinghouse, H. Dail; Gantar, Miroslav
Source:
Biomass and bioenergy 2019 v.122 pp. 280-289
ISSN:
0961-9534
Subject:
algae culture,   etc   ; Characium; Pseudomonas; algae; bacteria; biofuels; biomass production; biotechnology; coculture; filtrates; fossil fuels; freshwater; lipids;     Show all 13 Subjects
Abstract:
... Renewable energies, such as biofuels from algae, are a promising approach to deviate from fossil fuels. Mass algae cultivation requires better control over algae culture including taking advantage of co-cultivation with growth and lipid-promoting microorganisms. Integrating co-cultures into algal biotechnology can be beneficial in achieving enhanced yields and reduced expenditures. This work uses ...
DOI:
10.1016/j.biombioe.2019.01.033

19. Modeling the impact of rotifer contamination on microalgal production in open pond, photobioreactor and thin layer cultivation systems

Author:
Deruyck, Bert; Thi Nguyen, Kim Hue; Decaestecker, Ellen; Muylaert, Koenraad
Source:
Algal research 2019 v.38 pp. 101398
ISSN:
2211-9264
Subject:
algae culture,   etc   ; Rotifera; biomass; carrying capacity; microalgae; models; photobioreactors; population density; population dynamics;     Show all 9 Subjects
Abstract:
... Contamination of microalgal cultures by rotifers is known to cause large losses in productivity. The factors that control population dynamics of rotifers in microalgal cultures were studied in controlled contamination experiments in laboratory cultures. These experiments revealed that rotifer growth rates increase with microalgae biomass at low rotifer population densities and declines with rotife ...
DOI:
10.1016/j.algal.2018.101398

20. Monoalgal and mixed algal cultures discrimination by using an artificial neural network

Author:
Franco, B.M.; Navas, L.M.; Gómez, C.; Sepúlveda, C.; Acién, F.G.
Source:
Algal research 2019 v.38 pp. 101419
ISSN:
2211-9264
Subject:
algae culture,   etc   ; Arthrospira platensis; Nostoc; Scenedesmus; absorbance; absorption; microalgae; neural networks;     Show all 8 Subjects
Abstract:
... In this paper, a rapid methodology to elucidate microalgae species in suspensions has been developed and validated. To do this, microalgae spectral signatures from light absorption measurements of different algal species were analysed through an artificial neural network (ANN) in order to describe and classify them. Four important species were used: Nostoc sp., Scenedesmus almeriensis, Spirulina p ...
DOI:
10.1016/j.algal.2019.101419