2024-03-28T10:30:49Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/234542021-06-24T07:35:06Zcom_10324_1173com_10324_931com_10324_894com_10324_31059com_10324_954col_10324_1371col_10324_31061
00925njm 22002777a 4500
dc
Toledo Cervantes, Alma
author
Serejo, Mayara L.
author
Blanco, Saúl
author
Pérez Fernández, Rebeca
author
Lebrero Fernández, Raquel
author
Muñoz Torre, Raúl
author
2016
A pilot high rate algal pond (HRAP) interconnected to an external CO2–H2S absorption column via settled broth recirculation was used to simultaneously treat a synthetic digestate and to upgrade biogas to a bio-methane with sufficient quality to be injected into natural gas grids. An innovative HRAP operational strategy with biomass recirculation based on the control of algal-bacterial biomass productivity (2.2, 4.4 and 7.5 g m− 2 d− 1) via settled biomass wastage was evaluated in order to enhance nutrient recovery from digestate at a constant hydraulic retention time. The influence of the recycling liquid to biogas (L/G) ratio on the quality of the upgraded biogas was assessed. The bio-methane composition under a L/G ratio of 1 (0.4 ± 0.1% CO2, 0.03 ± 0.04% O2, 2.4 ± 0.2% N2 and 97.2 ± 0.2% CH4) complied with the technical specifications of most European bio-methane legislations regardless of the biomass productivity established. The HRAP operational strategy applied allowed increasing the N and P recovery from 19 and 22% to 83 and 100%, respectively, when the biomass productivity was increased from 2.2 to 7.5 g m− 2 d− 1. Finally, the dynamics of microalgae and bacteria population structure were characterized by morphological identification and Denaturing Gradient Gel Electrophoresis analysis.
Algal Research, 2016, Volume 17, pg.46–52
http://uvadoc.uva.es/handle/10324/23454
https://doi.org/10.1016/j.algal.2016.04.017
Algal Research
Photosynthetic biogas upgrading to bio-methane: Boosting nutrient recovery via biomass productivity control