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    Effects of high temperature & pressure pretreatment process on methane production from cyanobacteria
    (2023) Şahan, Murat; Fardinpoor, Mona; Yılmaz, Vedat; Yılmaz , Fatih; Altınay Perendeci, N.
    first_pagesettingsOrder Article Reprints Open AccessArticle Effects of High Temperature & Pressure Pretreatment Process on Methane Production from Cyanobacteria by Murat Şahan 1,Mona Fardinpoor 1,Vedat Yılmaz 2ORCID,Fatih Yılmaz 1ORCID andN. Altınay Perendeci 1,*ORCID 1 Environmental Engineering Department, Engineering Faculty, Akdeniz University, 07070 Antalya, Turkey 2 Environmental Engineering Department, Engineering Faculty, Artvin Çoruh University, 08000 Artvin, Turkey * Author to whom correspondence should be addressed. Fermentation 2023, 9(3), 240; https://doi.org/10.3390/fermentation9030240 Received: 7 February 2023 / Revised: 24 February 2023 / Accepted: 27 February 2023 / Published: 1 March 2023 (This article belongs to the Special Issue Bioresources and Bioenergies Production from Microalgae by Fermentation Technology) Download Browse Figures Review Reports Versions Notes Abstract In this study, Desertifilum tharense cyanobacteria, which has energy generation potential, was firstly isolated from the water sources from Denizli/Turkey, the culture-specific parameters were identified, characterization analyses were performed, and the production in photoreactors under laboratory conditions was performed. D. tharense cyanobacterium was subjected to a high temperature–pressure pretreatment process (HTPP) to increase methane production efficiency, and the pretreatment process was optimized for methane production. D. tharense had a total carbon (C) content of 50.2% and total organic carbon content (TOC) of 48.9%. The biochemical methane potential (BMP) of the raw D. tharense sample was measured as 261.8 mL methane (CH4) per gram of volatile solids (VS). In order to investigate the effects of HTPP and to determine the optimum process conditions, Central Composite Design (CCD) approach-based Response Surface Methodology (RSM) was used. BMP values of the samples treated with HTTP were measured in the range of 201.5–235 mLCH4 gVS?1 and lower than the raw sample. These results revealed that the HTPP is not suitable for the production of biofuel methane from D. tharense. The optimization of the HTPP was carried out by Design Expert software. For maximum BMP production, the software proposed a reaction temperature of 200 °C and a reaction time of 20 min as optimum conditions. With the proposed model, it was estimated that 227.1 mLCH4 g VS?1 methane could be produced under these conditions, and 211.4 mLCH4 g VS?1 methane was produced in the validation experiment. It was determined that D. tharense cyanobacterium could be used as a suitable biomass source for methane production. However, it was not necessary to use the HTTP as a pretreatment process prior to the methane production.
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    Effects of hydrodynamic cavitation-assisted NaoOH pretreatment on biofuel production from cyanobacteria: promising approach
    (Springer, 2021) Fardinpoor, Mona; Perendeci, Nuriye Altınay; Yılmaz, Vedat; Taştan, Burcu Ertit; Yılmaz, Fatih
    Eukaryotic microalgae and prokaryotic cyanobacteria can grow in various water and wastewater types, and both can grow biomass by taking nutrients and converting atmospheric CO2 into useful products. Biofuels obtained by processing this landless grown biomass are defined as “third-generation biofuels”. In this study, the effects of hydrodynamic cavitation (HC)-assisted NaOH pretreatment on methane production from cyanobacteria were investigated. Cyanobacterial biomass was isolated from thermal springs located in the southwest of Turkey (Denizli-Turkey) and identified as Desertifilum tharense. Desertifilum tharense biomass was grown on a laboratory scale, and along with its compositional characteristics, culture-specific parameters were determined. HC-assisted NaOH pretreatment was applied to evaluate optimum process conditions for enhancing methane production from D. tharense. In the experimental design, process parameters of cavitation number (Cv: 0.3-0.7), NaOH concentration (0–4%), solid content (1.5%), reaction time (4h), and reaction temperature (30°C) were combined to reveal the parameter-specific impact of HC pretreatment. The effect of the HC-assisted NaOH pretreatment was further investigated with molecular-bond and surface structure characterization. Along with the energy equivalent of obtained biofuel, energy requirements for cultivation, harvesting, pretreatment, and anaerobic digestion (AD) were calculated to determine the process’s overall energy efficiency. Kinetic parameters of raw and pretreated D. tharense were determined by first-order, cone, modified Gompertz, and reaction curve models. The results revealed that by the application of pretreatment, a 2-35.3% soluble COD increase was achieved, whereas methane production was increased from 241.5 to 290.6 mLCH4 gVS?1. Application of HC with a low Cv of 0.3 boosted methane production up to 20.3% compared to the raw D. tharense.