2024-03-19T08:05:46Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/532532023-08-24T08:25:50Zcom_10324_1173com_10324_931com_10324_894col_10324_1371
Sepúlveda Muñoz, Cristian Andrés
Hontiyuelo, Gorka
Torres Franco, Andrés Felipe
Muñoz Torre, Raúl
2022-05-05T11:36:26Z
2022-05-05T11:36:26Z
2022
Journal of Water Process Engineering, 2022, vol. 47, 102825
2214-7144
https://uvadoc.uva.es/handle/10324/53253
10.1016/j.jwpe.2022.102825
Nowadays, piggery wastewater (PWW) management still represents an unsolved global environmental problem. Photosynthetic processes have emerged as an innovative biological platform capable of performing a cost-effective treatment of wastewater with a concomitant assimilation of nutrients into biomass. In this work, the performance of a purple phototrophic bacteria photobioreactor (PPB-PBR) coupled with a microalgae-bacteria photobioreactor (MB-PBR) was assessed during the treatment of PWW at an hydraulic retention time (HRT) of 12.2 (stage I) and 6.2 days (stages II–VI) and intensities of near-infrared radiation in the PPB-PBR of 30 W m−2 (stages I–II) and 114 W m−2 (stages III–IV). Maximum removal efficiencies of total dissolved organic carbon (TOC-RE) and total dissolved nitrogen (TN-RE) of 91% and 82%, respectively, were recorded at an HRT of 12.2 days. The decrease in HRT to 6.2 days reduced the TOC-RE and TN-RE in both photobioreactors, but the increase in near-infrared radiation enhanced TOC-RE in the PPB-PBR, contributing to a global carbon recovery of 67% via assimilation in the form of PPB biomass. PPB-PBR was highly efficient in carbon assimilation, while MB-PBR enhanced nitrogen and total suspended solids removals, with a contribution to TN-RE of 63% and a global decrease in TSS of 76%. The culture broth of PPB-PBR was dominated by Rhodopseudomonas sp. up to 54%, supported by the high HRT and the increase in near-infrared radiation, while the sequential MB-PBR favoured the dominance of Mychonastes homosphaera. This work demonstrated, for the first time, the high efficiency of sequentially coupling PPB and microalgae for the treatment of PWW.
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2022 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Atribución 4.0 Internacional
Photosynthetic treatment of piggery wastewater in sequential purple phototrophic bacteria and microalgae-bacteria photobioreactors
info:eu-repo/semantics/article