Microalgae community shifts during the biogas upgrading in an alkaline open photobioreactor

Abstract

The alkaline conditions enhance the CO absorption from biogas and could optimize specialized microalgae communities in the open photobioreactor. Denaturing gradient gel electrophoresis fingerprinting and richness index comparison are useful methods for the evaluation of microalgae community shifts and photosynthetic activity performance, particularly in systems intended for CO removal from biogas where the CO assimilation potential can be related to the microbial richness.

Impact of the algal-bacterial community structure, physio-types and biological and environmental interactions on the performance of a high rate algal pond treating biogas and wastewater

“…S3). It has been previously reported that algal biomass activity is proportional to the pond temperature up to an optimum, above which, increasing algal respiration and photorespiration reduces the overall biomass productivity [11,20]. However, no significant difference at p < 0.05 between the average temperatures recorded from April to October was observed in this study (Table 1, mmc: Fig.…”

“…Thus, the slight pH seasonal variations did not have a statistically significant effect on the algal and prokaryotic community (p < 0.15 and p < 0.75, respectively). The algal community was mainly composed of freshwater chlorophyte genera that can tolerate pH values up to 10.6-11, such as Chlorella, Scenedesmus and Desmodesmus [11]. However, the impact of the other environmental conditions on the metabolism of microalgae resulted in C. vulgaris as the dominant species in the HRAP.…”

“…Wastewater treatment is affected through the removal capacity of N and P and ultimately digestate loading rate. Biogas upgrading efficiency is affected through pH and dissolved oxygen in the cultivation broth [1,11]. Algae are involved in the production of O 2 , consumption of CO 2 and nutrient removal via photosynthesis, while bacteria are in charge of the fixation and regeneration of inorganic nutrients (NH 3 , PO 4 3− , and H 2 S oxidation), consumption of organic matter and production of vitamins and siderophores [2,8].…”

Wastewater from maize lime‐cooking as growth media for alkaliphilic microalgae–cyanobacteria consortium to reduce chemical oxygen demand and produce biomass with high protein content

“…and Pseudanabaena sp. reported by Granada-Moreno et al (2017) was used for all the experiments. AMC was grown in mineral salt medium (MSM) containing (g/L) Na 2 CO 3 (4.03), NaHCO 3 (13.61), NaCl (1), K 2 HPO 4 (1), K 2 SO 4 (1), CaCl 2 Á2H 2 0 (0.4), KNO 3 (2.53) and MgCl 2 Á6H 2 O (0.203) according to de los de los Cobos-Vasconcelos et al (2016), and 2 mL/L of micronutrient solution as reported by Sorokin et al (2001).…”

Integral (VOCs, CO2, mercaptans and H2S) photosynthetic biogas upgrading using innovative biogas and digestate supply strategies

“…At this point, it is worth to highlight that during the upgrading of gas streams using microalgal-bacterial cultures, all microorganisms involved are subjected to dynamic changes depending on the operational conditions, the time of exposure to gas contaminants and nutrients supply [15]. Therefore, the ad-hoc control of microalgae biomass composition during the photosynthetic biogas upgrading can enhance the economic sustainability of the process by producing a biomass feedstock with a tailored valorization potential.…”