RETRACTED: Bioflocculation: An alternative strategy for harvesting of microalgae – An overview

Ummalyma, Sabeela Beevi; Gnansounou, Edgard; Sukumaran, Rajeev; Sindhu, Raveendran; Pandey, Ashok; Sahoo, Dinabandhu

doi:10.1016/j.biortech.2017.02.097

Cited by 233 publications

(92 citation statements)

References 91 publications

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“…Ummalyma et al. () studied the algal microenvironment without supplement addition and found a large amount of dissolved organic C in the microalgal environment, which promoted the growth of bacteria.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the metabolites produced by bacteria and algae can also be utilized by microorganisms and microalgae, thus reducing the cost of additional energy sources. Ummalyma et al (2017) studied the algal microenvironment without supplement addition and found a large amount of dissolved organic C in the microalgal environment, which promoted the growth of bacteria.…”

Section: Research Articlementioning

confidence: 99%

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Influence of three microalgal‐based cultivation technologies on different domestic wastewater and biogas purification in photobioreactor

Sun

Gao

et al. 2019

Water Environment Research

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To investigate the effects of different microalgae and culture methods on the purification of domestic wastewater and biogas, Chlorella vulgaris and Scenedesmus obliquus were selected. Three different culture methods (monoculture, microalgal–fungi cocultivation, and microalgal‐activated sludge cocultivation) were used to remove nutrients from four different domestic wastewaters and remove CO2 from raw biogas in a photobioreactor. The results show that the effluent from the centrate of pretreated urban wastewater (WW4) achieved the highest nutrient and CO2 removal efficiency. Cocultivation of C. vulgaris and activated sludge achieved the highest COD, TP, and CO2 removal efficiencies of 79.27%, 81.25%, and 60.39% with WW4, respectively. Cocultivation of C. vulgaris and fungi achieved the highest TN removal efficiency of 78.46% with WW4. The contents of C, N, and P in the microalgal‐activated sludge symbiont after treatment exceeded 50%, 8%, and 0.8%, respectively. Highly economically efficient energy consumption was achieved with WW4 for both C. vulgaris and S. obliquus. Microalgal‐activated sludge cocultivation was identified as the optimal option for the simultaneous purification of wastewater and biogas based on its high pollution and CO2 removal efficiency. This provides a reference for the microalgal‐based purification of actual domestic wastewater and raw biogas. Practitioner points Nutrient and CO2 were efficiently removed by C. vulgaris with activated sludge. CO2 was removed up to 60.4% and was economically viable. Cocultivation of C. vulgaris and fungi could achieve the highest TN removal with WW4.

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Section: Resultsmentioning

confidence: 99%

Section: Research Articlementioning

confidence: 99%

Influence of three microalgal‐based cultivation technologies on different domestic wastewater and biogas purification in photobioreactor

Sun

Gao

et al. 2019

Water Environment Research

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“…Algal suspensions are generally very dilute; therefore increasing the biomass content in the cultivation stage can substantially reduce costs, which is a major advantage for closed and attached growth PBRs compared to open ponds (Fasaei et al, 2018). Advances have been made in harvesting technology, by employing for example cross-flow filtration (Gerardo et al, 2014), cheaper flocculants (' T Lam et al, 2018;Nguyen et al, 2019), bio-flocculants (Ummalyma et al, 2017), microfluidics at lab scale (Kim et al, 2018), and novel techniques such as pulsed electric field, ultrasound, and electroflocculation, that have yet to be demonstrated at industrial scale (Milledge and Heaven, 2013;'T Lam et al, 2018). However, while some harvesting processes can reduce the energy costs -for example filtration has a lower energy requirement compared to centrifugation -they can lead to a higher operating cost (e.g.…”

Section: Algal Cultivationmentioning

confidence: 99%

Emerging Technologies in Algal Biotechnology: Toward the Establishment of a Sustainable, Algae-Based Bioeconomy

et al. 2020

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Mankind has recognized the value of land plants as renewable sources of food, medicine, and materials for millennia. Throughout human history, agricultural methods were continuously modified and improved to meet the changing needs of civilization. Today, our rapidly growing population requires further innovation to address the practical limitations and serious environmental concerns associated with current industrial and agricultural practices. Microalgae are a diverse group of unicellular photosynthetic organisms that are emerging as next-generation resources with the potential to address urgent industrial and agricultural demands. The extensive biological diversity of algae can be leveraged to produce a wealth of valuable bioproducts, either naturally or via genetic manipulation. Microalgae additionally possess a set of intrinsic advantages, such as low production costs, no requirement for arable land, and the capacity to grow rapidly in both large-scale outdoor systems and scalable, fully contained photobioreactors. Here, we review technical advancements, novel fields of application, and products in the field of algal biotechnology to illustrate how algae could present high-tech, low-cost, and environmentally friendly solutions to many current and future needs of our society. We discuss how emerging technologies such as synthetic biology, highthroughput phenomics, and the application of internet of things (IoT) automation to algal manufacturing technology can advance the understanding of algal biology and, ultimately, drive the establishment of an algal-based bioeconomy.

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“…The most common biological separation approach is bioflocculation because the microalga dewatering costs under this technique can be reduced, no chemical costs are involved, and the process requires lower energy consumption. For example, microbial flocculants can be used for this purpose due to their high harvesting efficiency and biodegradability …”

Section: Main Steps That Should Be Considered To Develop Cleaner Techmentioning

confidence: 99%

Microalgae and Clean Technologies: A Review

Souza

Hoeltz

Benitez

et al. 2019

CLEAN Soil Air Water

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The search for clean technologies needs to be continued to offer alternatives for achieving sustainable energy production and a sustainable economy. This concern is particularly related to the demands of both producing enough renewable energy to meet future needs and reducing greenhouse gas (GHG) emissions. Microalgae are recognized for several benefits they offer, and in recent years, the use of life cycle assessment (LCA) to evaluate the benefits resulting from microalgae cultivation, harvesting/dewatering, biomass drying, extraction, and byproduct development has stimulated research in this area. Considering the importance of microalgae and clean technologies and the increasing number of publications on these subjects, this review aims to perform bibliometric mapping of such studies from 2008 to 2018. Web of Science and Scopus databases are used to identify leading trends. Visualization of similarities viewer (VOSviewer) software is applied to analyze the interactions among keywords. The results of this study indicate an association of microalgae and clean technologies and demonstrate that LCA is one of the most common tools used for such analyses. Bibliometric mapping provides relevant data to reinforce this association and understand the main bottlenecks that must be overcome in this field for future progress to be made.

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RETRACTED: Bioflocculation: An alternative strategy for harvesting of microalgae – An overview

Cited by 233 publications

References 91 publications

Influence of three microalgal‐based cultivation technologies on different domestic wastewater and biogas purification in photobioreactor

Influence of three microalgal‐based cultivation technologies on different domestic wastewater and biogas purification in photobioreactor

Emerging Technologies in Algal Biotechnology: Toward the Establishment of a Sustainable, Algae-Based Bioeconomy

Microalgae and Clean Technologies: A Review

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