| 1. |
- Goswami, Rahul Kumar, et al.
(författare)
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Multifaceted application of microalgal biomass integrated with carbon dioxide reduction and wastewater remediation : A flexible concept for sustainable environment
- 2022
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Ingår i: Journal of Cleaner Production. - : Elsevier. - 0959-6526 .- 1879-1786. ; 339
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Forskningsöversikt (refereegranskat)abstract
- Microalgae are ubiquitous, diverse, and photosynthetic organisms in nature and have prominent applications in carbon dioxide (CO2) mitigation and wastewater remediation. This review has compiled the recent trends in the potential application of microalgae for wastewater treatment and combating CO2 emissions and multifaceted use of its biomass for the co-production of bioenergy and human health products. In specific, this review critically addressed; (a) global scenario of carbon footprint and wastewater remediation and concept of circular bioeconomy, (b) approaches of sterile and non-sterile cultivation of microalgae, (c) state-of-art biorefinery especially for harvesting of algal biomass, d) details of microalgal high-value compounds (HVAC) such as lipids, fatty acids, carbohydrates, carotenoids, sterols, and polyphenolic compounds, (e) recent biomass to biofuel strategies, and (f) market analysis, recent challenges and future progress. The review establishes that the microalgae can simultaneously treat different types of wastewater, recover nutrients/metals, and mitigate CO2 from flue gas via its biofixation ability. The flocculation method is found to be best for harvesting the algal biomass. The non-sterile cultivated biomass can be utilized for biofuels production, and sterile biomass can be used to produce HVAC compounds that have significant application in human health.
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| 2. |
- Goswami, Rahul Kumar, et al.
(författare)
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Current perspective on wastewater treatment using photobioreactor for Tetraselmis sp. : an emerging and foreseeable sustainable approach
- 2022
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Ingår i: Environmental Science and Pollution Research. - : Springer. - 0944-1344 .- 1614-7499. ; 29:41, s. 61905-61937
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Forskningsöversikt (refereegranskat)abstract
- Urbanization is a revolutionary and necessary step for the development of nations. However, with development emanates its drawback i.e., generation of a huge amount of wastewater. The existence of diverse types of nutrient loads and toxic compounds in wastewater can reduce the pristine nature of the ecosystem and adversely affects human and animal health. The conventional treatment system reduces most of the chemical contaminants but their removal efficiency is low. Thus, microalgae-based biological wastewater treatment is a sustainable approach for the removal of nutrient loads from wastewater. Among various microalgae, Tetraselmis sp. is a robust strain that can remediate industrial, municipal, and animal-based wastewater and reduce significant amounts of nutrient loads and heavy metals. The produced biomass contains lipids, carbohydrates, and pigments. Among them, carbohydrates and lipids can be used as feedstock for the production of bioenergy products. Moreover, the usage of a photobioreactor (PBR) system improves biomass production and nutrient removal efficiency. Thus, the present review comprehensively discusses the latest studies on Tetraselmis sp. based wastewater treatment processes, focusing on the use of different bioreactor systems to improve pollutant removal efficiency. Moreover, the applications of Tetraselmis sp. biomass, advancement and research gap such as immobilized and co-cultivation have also been discussed. Furthermore, an insight into the harvesting of Tetraselmis biomass, effects of physiological, and nutritional parameters for their growth has also been provided. Thus, the present review will broaden the outlook and help to develop a sustainable and feasible approach for the restoration of the environment.
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| 3. |
- Goswami, Rahul Kumar, et al.
(författare)
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Development of economical and sustainable cultivation system for biomass production and simultaneous treatment of municipal wastewater using Tetraselmis indica BDUG001
- 2023
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Ingår i: Environmental technology. - : Taylor & Francis. - 0959-3330 .- 1479-487X.
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Tidskriftsartikel (refereegranskat)abstract
- Microalgal-based bioprocess offers several advantages including wastewater reclamations, therefore present study assessed the usability of the combination of untreated municipal sewage wastewater (UTMSWW) and secondary treated municipal sewage wastewater (STSWW) for nutrient removal and recovery by Tetraselmis indica (T. indica) BDUG001. The present study optimized the additional nutrient supplementations (e.g. ASN-III) percentage and day-night cycle, pH and pH with aeration for monitoring high-rate biomass production and nutrient recovery. The study results showed that the combination of 75% UTMSWW + 25% ASN-III supported maximum biomass production (2.65 ± 0.07 g/L). In the optimized day-night cycle (12:12 h), T. indica BDUG001 showed improved biomass production (2.75 ± 0.07 g/L), biomass productivity (165.63 ± 4.42 mg/L/d), and photosynthetic pigments production. Under optimized pH∼ 7.0 with aeration, maximum total nitrate (TN) removal efficiency (87.67 ± 3.08–91.55 ± 1.92%) was observed, while COD and TP removal was maximum at pH ∼ 9.0. The maximum biomass production (2.35 ± 0.07–2.77 ± 0.04 g/L) with biomass productivity (93.75 ± 167.19 ± 2.21 mg/L/d) and lipid content (42.98 ± 1.86–47.85 ± 0.21% DCW) were also at pH 7.0. with aeration. The present study verified the utilization of UTMSWW with the combination of conventional medium, optimized day-night cycle, pH with aeration along with designing low-cost PBR. It was the ideal system for the cultivation of T. indica BDUG001 for the recovery of nutrients from wastewater, production of biofuels and value-added feedstock.
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| 4. |
- Mehariya, Sanjeet, et al.
(författare)
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Integrated approach for wastewater treatment and biofuel production in microalgae biorefineries
- 2021
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Ingår i: Energies. - : MDPI. - 1996-1073. ; 14:8
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Forskningsöversikt (refereegranskat)abstract
- The increasing world population generates huge amounts of wastewater as well as large energy demand. Additionally, fossil fuel’s combustion for energy production causes the emission of greenhouse gases (GHG) and other pollutants. Therefore, there is a strong need to find alternative green approaches for wastewater treatment and energy production. Microalgae biorefineries could represent an effective strategy to mitigate the above problems. Microalgae biorefineries are a sustainable alternative to conventional wastewater treatment processes, as they potentially allow wastewater to be treated at lower costs and with lower energy consumption. Furthermore, they provide an effective means to recover valuable compounds for biofuel production or other applications. This review focuses on the current scenario and future prospects of microalgae biorefineries aimed at combining wastewater treatment with biofuel production. First, the different microalgal cultivation systems are examined, and their main characteristics and limitations are discussed. Then, the technologies available for converting the biomass produced during wastewater treatment into biofuel are critically analyzed. Finally, current challenges and research directions for biofuel production and wastewater treatment through this approach are outlined.
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| 5. |
- Mehariya, Sanjeet, et al.
(författare)
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Microalgae for high-value products : A way towards green nutraceutical and pharmaceutical compounds
- 2021
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Ingår i: Chemosphere. - : Elsevier. - 0045-6535 .- 1879-1298. ; 280
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Tidskriftsartikel (refereegranskat)abstract
- Microalgae is a renewable bioresource with the potential to replace the conventional fossil-based industrial production of organic chemicals and pharmaceuticals. Moreover, the microalgal biomass contains carotenoids, vitamins, and other biomolecules that are widely used as food supplements. However, the microalgal biomass production, their composition variations, energy-intensive harvesting methods, optimized bio-refinery routes, and lack of techno-economic analysis are the major bottleneck for the life-sized commercialization of this nascent bio-industry. This review discusses the microalgae-derived key bioactive compounds and their applications in different sectors for human health. Furthermore, this review proposes advanced strategies to enhance the productivity of bioactive compounds and highlight the key challenges associated with a safety issue for use of microalgae biomass. It also provides a detailed global scenario and market demand of microalgal bioproducts. In conclusion, this review will provide the concept of microalgal biorefinery to produce bioactive compounds at industrial scale platform for their application in the nutraceutical and pharmaceutical sector considering their current and future market trends.
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