Article
Energy & Fuels
Jayati Trivedi, Deepti Agrawal, Neeraj Atray, Anjan Ray
Summary: The present study optimized nitrate concentration in a flat panel photobioreactor to achieve high lipid accumulation of Scenedesmus obliquus CCAP 276/3A and a FAME profile suitable for biodiesel production. The results showed that Scenedesmus obliquus CCAP 276/3A is a suitable feedstock for biodiesel production, and provided important insights into enhancing lipid production in algae.
Article
Environmental Sciences
Zhipeng Zhen, Ran Cai, Muhammad Salam, Jianmei Hu, Bing Yang, Mengzi Liu, Hong Li, Bingran Tang
Summary: This study systematically investigated the effects of biodegradable microplastics on the growth and competition of Microcystis aeruginosa and Scenedesmus obliquus. The results showed that microplastic addition promoted the growth of M. aeruginosa but reduced its toxin-producing capability, weakening its competitive advantage over S. obliquus.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Environmental Sciences
Junzhi Liu, Jinye Yin, Yaming Ge, Houfeng Han, Mei Liu, Feng Gao
Summary: This study aimed to evaluate the growth and lipid productivity improvement of Scenedesmus obliquus using mixotrophic cultivation with sodium acetate added to actual municipal wastewater. The results demonstrated that the addition of NaAc significantly enhanced algal growth, lipid productivity, and nutrient removal efficiency, indicating the feasibility of using organic carbon-supplemented AMW for microalgae-based lipid production and nutrient recycling.
Article
Environmental Sciences
Liang Guo, Qirui Wu, YenJung Sean Lai, Everett Eustance, Bruce E. Rittmann
Summary: Microalgal-based processes show promise in addressing phosphorus recovery from wastewater and biofuel production. This study investigated the impact of phosphorus supply on microalgal growth, lipid yield, and phosphorus distribution for Scenedesmus during nitrogen starvation. Extracellular polymeric substances and intracellular polymeric substances were the main storages for inorganic phosphorus and organic phosphorus, respectively. Under low phosphorus supply, the main phosphorus pool for microalgae was extracellular polymeric substances, while high phosphorus concentrations stored most phosphorus in intracellular polymeric substances. High orthophosphate concentration stimulated rapid phosphorus uptake and promoted its transformation to organic phosphorus during biomass synthesis. The highest phosphorus content in microalgal biomass was 6.5% of dry weight at a phosphorus concentration of 113 mg/L, while the organic phosphorus content was 4.9% of dry weight. High phosphate-P availability enhanced microalgal biomass synthesis, lipid production, and phosphorus accumulation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Sherif Ishola Mustapha, Usman Aliyu Mohammed, Ismail Rawat, Faizal Bux, Yusuf Makarfi Isa
Summary: This study investigates the effects of nutrient stressing on the yield and quality of bio-oil produced from microalgae thermal conversion. The results show that nutrient stressing can enhance the bio-oil yield and improve its quality. Additionally, a predictive model based on artificial neural network is developed for bio-oil yield prediction.
Article
Engineering, Chemical
Matheus Lopes Amorim, Jimmy Soares, Bruno Bezerra Vieira, Mauricio de Oliveira Leite, Dilson Novais Rocha, Pedro Eleuterio Aleixo, Javier Hernan Heredia Falconi, Maurilio de Lucas Xavier Junior, Luiz Fernando Teixeira Albino, Marcio Aredes Martins
Summary: The study evaluated algae farming and biomass biorefining on a pilot scale for producing protein concentrate and crude lipids, showing efficient extraction processes and essential amino acid composition in the protein concentrate. The protein concentrate-based feed demonstrated similar ingestion in broilers compared to control group, but with lower energy efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Ecology
Samridhi Rana, Arun Kumar
Summary: This study investigated the toxic effect of ZnO and CuO nanoparticles on freshwater microalgae. The results showed that the presence of a mixture of nanoparticles caused structural damage to the algae. In addition, the toxicity of the nanoparticles differed based on their concentration, with CuO nanoparticles showing the highest toxicity at low concentration and the mixture of nanoparticles showing antagonistic effects on the dry cell weight of the algae.
Article
Green & Sustainable Science & Technology
Sherif Ishola Mustapha, Ismail Rawat, Faizal Bux, Yusuf Makarfi Isa
Summary: The pyrolysis of nutrient-stressed Scenedesmus obliquus microalgae over various supported metal catalysts showed promotion of aromatization and acid ketonization of bio-oils. Among the catalysts, Co/Fe3O4-HZSM-5 performed the best in enhancing bio-oil quality and yield, with the lowest nitrogen content, highest bio-oil yield, and HHV value similar to crude petroleum.
Article
Multidisciplinary Sciences
Noura El-Ahmady El-Naggar, Ragaa A. Hamouda, Ghada W. Abou-El-Souod
Summary: Microalgae have diverse applications, with the most important one being the biological treatment of wastewater. This study investigated the factors that have the most significant impact on the simultaneous decolorization of methyl red and lipid production by the microalgae Scenedesmus obliquus. The results showed that microalgae can effectively remove dyes and produce renewable fuels such as biodiesel.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Harshita Singh, Swagatika Rout, Debabrata Das
Summary: This study focused on biohydrogen production from microalgal biomass and valorization of dark fermentation effluent through biomethanation, achieving a total substrate energy recovery of 30%.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Environmental Sciences
Yingying Yang, Jiamin Zhao, Meijing Song, Jiayu Yu, Xiao Yu, Biao Ding, Xiurong Chen
Summary: The coal-to-gas process produces carbon dioxide, leading to global warming, and its wastewater treatment results in highly organically toxic sludge. Scenedesmus obliquus is a promising solution to these environmental issues, with a focus on its photosynthetic pigments. The optimal CO2 concentration for the growth of Scenedesmus obliquus was found to be 30% after increasing the CO2 concentration from 0.05% to 100%. The cultivation of Scenedesmus obliquus resulted in the accumulation of photosynthetic pigments and a significant reduction in the organic toxicity of the sludge extract.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Hakimeh Mansouri, Sahar Ebrahim Nezhad, Hesam Kamyab, Shreeshivadasan Chelliapan, Irina Kirpichnikova
Summary: The mixotrophic growth of microalgae, specifically using acetate and pyruvate as carbon sources, has been found to significantly increase the biomass and biochemical parameters of Scenedesmus obliquus. Aeration has different effects on mixotrophic cultures, with acetate leading to a decline in biomass and biochemical parameters, while pyruvate showing enhancement effects. The fatty acid composition of the algae also changes under different growth conditions.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Environmental Sciences
Xiaojie Tu, Pingping Xu, Yuxuan Zhu, Wujuan Mi, Yonghong Bi
Summary: This study examined the binding mechanism between cadmium ions and algal organic matter (AOM). It was found that the accumulation rate of Cd2+ reached 40% at low concentrations while it was only about 10% at high concentrations. The AOM contained different protein and peptide components, and their changes during Cd2+ binding were observed. These findings provide deep insights into the interaction mechanism between AOM and Cd2+ in aquatic environments.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Biotechnology & Applied Microbiology
Mei Zhang, Hualong Wang, Feng Chen
Summary: This study investigated the molecular response of microalga Scenedesmus obliquus HTB1 to high CO2 levels. The results showed that HTB1 can quickly adapt to 10% CO2 within 12 hours and exhibit functional responses related to photosynthesis, carbon metabolism, and nitrogen assimilation.
MICROBIAL BIOTECHNOLOGY
(2023)
Article
Environmental Sciences
Xiangmeng Ma, Xin Yan, Jinjie Yao, Simi Zheng, Qun Wei
Summary: Microalgal biofilm with luffa sponge carrier exhibited the highest efficiency in removing cadmium from aqueous solution, showing increased tolerance towards higher Cd2+ concentrations. The study suggests that a microalgal biofilm with a biological carrier system is efficient, cost-effective, and can enhance cadmium removal in advanced wastewater treatment and microalgae harvesting processes.
