Simulation of Microalgal Growth in a Continuous Photobioreactor With Sedimentation and Partial Biomass Recycling

Silva, Carlos Eduardo de Farias; Gris, Barbara; Bertucco, Alberto

doi:10.1590/0104-6632.20160334s20150016

Cited by 4 publications

(3 citation statements)

References 13 publications

(7 reference statements)

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“…However, these algae have some drawbacks. First, their growth rate is low, which creates the problem of their use on an industrial scale [8,9]. To increase the rate of growth, it is necessary to create the optimal temperature, ensure the content of nutrients in the water and provide other favorable conditions.…”

Section: Methodsmentioning

confidence: 99%

Wastewater Treatment With Bioconversion for Motor Fuel Production

Shamanskyi¹,

Boichenko²,

Pavliukh³

2020

ScienceRise

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The object of research: the process of wastewater treatment using bioconversion for subsequent motor fuel production. Investigated problem: improving the efficiency of bioconversion process for biofuel production with simultaneous wastewater treatment by removing nitrogen and phosphorous compounds. The main scientific results: providing the possibility of biofuel production with energy and economic inefficiency. It is done by combining the process of motor biofuel production with the process of treating wastewater from biogenic elements makes it perspective for commercial use. Traditional technology for the production of motor biofuels from microalgae includes cultivation, harvesting, dehydration and drying of biomass, extraction of oils from them and subsequent production of methyl esters and glycerol. Such technology is often not economically effective. It requires significant amount of energy for carrying out all necessary processes. In addition, it requires significant expenditures of water and nutrients. The use of nutrient-rich wastewater as a culture medium for the cultivation of microalgae allows not only to reduce costs, but also to purify wastewater from nitrogen and phosphorus compounds, which makes this process economically effective. The area of practical use of the research results: Sewage and gray water treatment plants. Industrial and agricultural effluents treatment plants. Different types of enterprises, which have wastewater enriched with nitrogen and phosphorous compounds. Innovative technological product: The technology of microalgae cultivation using wastewater as a culture medium. The technology allows effectively purifying used wastewaters from nitrogen and phosphorous compounds with no waste at the end. Scope of the innovative technological product: Improved technology of motor biofuel production with simultaneous wastewater purification, which is economically effective and environmentally safe.

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Section: Methodsmentioning

confidence: 99%

Wastewater Treatment With Bioconversion for Motor Fuel Production

Shamanskyi¹,

Boichenko²,

Pavliukh³

2020

ScienceRise

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“…It can be affirmed that closed reactors are more promising because they have many advantages over open ones. There are many studies on the effectiveness of the use of closed rectors with various microalgae strains [24]. The use of freshwater as a culture medium is their disadvantage.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the photobioreactor operation efficiency in the technological scheme of wastewater treatment

Shamanskyi

Бойченко

Khrutba

et al. 2021

EEJET

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Conventional process schemes of municipal sewage water treatment, advantages, and disadvantages of the methods applied when removing biogenic elements were considered. It was shown that the existing shortcomings cause additional explicit costs and difficulties when disposing of the resulting waste. Low efficiency of the removal processes themselves causing residual concentrations of biogenic elements in the treated sewage water was also shown. A process scheme for treating municipal sewage water was proposed. It includes the use of a photobioreactor of a proposed design for the removal of biogenic elements due to the metabolism of microalgae. It was experimentally shown that the use of Euglena gracilis strain for removal of phosphates in initial concentrations of 4, 7, and 14 mg/dm3 from sewage water is the most efficient way. It makes it possible to reduce these concentrations to residual 0…0.55 mg/dm3 in four days. A 3.75…5.58 times increment of microalgae biomass during this period was also shown. A mathematical model was constructed for calculating the time of staying the sewage water and microalgae mixture in a photobioreactor to achieve the required degree of removal of biogenic elements. Based on the proposed model and experimental studies, the required time of staying in the rector working area was calculated. It was shown that with the use of Euglena gracilis strain but without removal of biogenic elements at previous purification stages (process schemes including only mechanical purification), the time of mixture staying in the working zone was 37.81 hrs. With partial removal of biogenic elements at the stage of biological treatment (0.55 mg/dm3 total nitrogen, 0.91 mg/dm3 ammonium nitrogen, 0.44 mg/dm3 phosphates), this time was reduced to 26.66 hrs. It was found that the use of Euglena gracilis strain instead of Chlorella vulgaris (FC-16) in the removal of phosphates results in a 2-time increase in the process efficiency and a 50 % decrease in time of mixture staying in the working zone. Recommendations for calculating geometric parameters of photobioreactors of the proposed design were given for use in the process schemes

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“…biomass. The choice of investigating Scenedesmus species (Chlorophyta) was motivated by its metabolic versatility that includes the ability to synthesize high amount of lipid (up to 30%) and monounsaturated fatty acids, notably oleic acid (C18:1) that can be converted into biodiesel (Silva et al 2016;Ye et al 2020). To the best of our knowledge, there has been no successful attempt to exploit the use of NTP as an effective inducer of intracellular lipid content in Scenedesmus microalgae cells in the route of algal biofuels.…”

Section: Introductionmentioning

confidence: 99%

Effect of non-thermal plasma process on biomass, lipid, fatty acid and lignocellulosic material of Scenedesmus microalga for biofuel production

Cubas

Moecke

Sousa

et al. 2023

Preprint

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This study assessed the effect of short-period (3 min.) application of non-thermal plasma (NTP) on the synthesis of biomass and lipids in Scenedesmus sp. as well as determine fatty acid content, elemental composition and lignocellulosic material. We also investigated the long-period (10 min.) exposure of microalgal biomass to NTP prior to lipid extraction. After subjecting the Scenedesmus biomass for short-period of plasma process, the maximum lipid productivity (20.6 mg L-1 day-1) was achieved on the fourth day of cultivation, with high percentages of saturated fatty acids notably palmitic acid (C16:0). Results of elemental composition (C, N, O, Na, Mg, Si, K, Ca) in Scenedesmus biomass showed that NTP application does not change these chemical compounds in algal biomass, while the lignocellulosic material such as cellulose content doubled (29.3%) of almost twice the value of the control sample (14.5%), which is associated with depolymerization of the D-glucose units mediated by NTP. After exposing the algal biomass for long-period of NTP as a pre-treatment method, the lipid recovery from Scenedesmus sp. ranged from 15.0 to 32.8% and decreased in the following order NTP (air + argon) ˃ sonication ˃ NTP (argon) ˃ NTP (air) ˃ control. These results suggest that NTP is a promising technology to not only induces lipid synthesis in microalgal cells but also to enhance the lipid recovery prior to lipid extraction, which can be converted into biodiesel. The lignocellulosic material in Scenedesmus biomass delignified by NTP can be also used to obtain second-generation bioethanol.

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Simulation of Microalgal Growth in a Continuous Photobioreactor With Sedimentation and Partial Biomass Recycling

Cited by 4 publications

References 13 publications

Wastewater Treatment With Bioconversion for Motor Fuel Production

Wastewater Treatment With Bioconversion for Motor Fuel Production

Improving the photobioreactor operation efficiency in the technological scheme of wastewater treatment

Effect of non-thermal plasma process on biomass, lipid, fatty acid and lignocellulosic material of Scenedesmus microalga for biofuel production

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