Isolation and screening of Tetradesmus dimorphus and Desmodesmus asymmetricus from natural habitats in Northwestern Chin
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ORIGINAL ARTICLE
Isolation and screening of Tetradesmus dimorphus and Desmodesmus asymmetricus from natural habitats in Northwestern China for clean fuel production and N, P removal Le Wang 1 & Lei Wang 1 & Habasi Patrick Manzi 1 & Qi Yang 1 & Zhaodi Guo 1 & Yuanzhang Zheng 2 & Xingrong Liu 1 & El-Sayed Salama 1 Received: 7 July 2020 / Revised: 16 September 2020 / Accepted: 24 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Isolation and screening of microalgal species from natural habitats should be a continues work to discover effective species for biofuel generation and wastewater treatment. In the current study, microalgal species namely Tetradesmus dimorphus GEEL-04 and Desmodesmus asymmetricus GEEL-05 were isolated, identified, and assessed for growth kinetics, nutrients removal efficiency, and whole biomass composition. T. dimorphus showed higher growth (1.46 OD680nm) compared with D. asymmetricus (1.16 OD680nm), and both showed 99% total nitrogen and total phosphorous removal. T. dimorphus and D. asymmetricus accumulated higher protein content (40.02 and 45.10%), carbohydrate (31.91 and 24.64%), and lipid (15.41 and 24.16%), respectively. The FTIR spectra absorbance revealed different function groups in microalgal biomass available for biofuel generation. Elemental analysis of microalgal biomass showed high carbon content 50.13% and 43.01% for T. dimorphus and D. asymmetricus, respectively. Thermogravimetric analysis indicated ≥ 80% volatile content in both isolates. The fatty acid composition of both microalgal strains showed high palmitic acid and linoleic acid corresponding to high quality biodiesel. These results indicated that the T. dimorphus and D. asymmetricus could be potential candidates for high biocomponents accumulation and N, P removal. Keywords Microalgae . Desmodesmus asymmetricus . Tetradesmus dimorphus . Biomass . Fatty acids . Biodiesel . N, P removal
1 Introduction The major challenges faced by today’s society are energy security, resource exhaustion, and climate changes and could be addressed by renewable energy production [1]. Biofuels produced from biomasses have several benefits such as regional development, sustainability, greenhouse gas emissions reduction, and agriculture security [2]. Numerous efforts have been put to find a potential feedstock which can easily convert
* Xingrong Liu [email protected] * El-Sayed Salama [email protected]; [email protected] 1
Department of Occupational and Environmental Health, School of Public Health, Lanzhou University, Lanzhou 730000, Gansu Province, People’s Republic of China
2
Department of Molecular Biology, School of Medicine Biochemistry, Indiana University, Indianapolis, IN 46202, USA
to biofuels [3]. The focus has mainly been on plant oils including rapeseed, soybean, sunflower, and safflower oils, which are edible. Although these feedstocks are abundant in nature, there exist social and economic challenges such as food security and cultivation, leading to search for an alternative and susta
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