The effect of seed sludge on the selection of a photo-EBPR system.

Autor: Carvalho VCF; UCIBIO-REQUIMTE, Department of Chemistry Faculty of Sciences and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal., Freitas EB; UCIBIO-REQUIMTE, Department of Chemistry Faculty of Sciences and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal., Fradinho JC; UCIBIO-REQUIMTE, Department of Chemistry Faculty of Sciences and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal. Electronic address: j.fradinho@campus.fct.unl.pt., Reis MAM; UCIBIO-REQUIMTE, Department of Chemistry Faculty of Sciences and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal., Oehmen A; UCIBIO-REQUIMTE, Department of Chemistry Faculty of Sciences and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.
Jazyk: angličtina
Zdroj: New biotechnology [N Biotechnol] 2019 Mar 25; Vol. 49, pp. 112-119. Date of Electronic Publication: 2018 Oct 24.
DOI: 10.1016/j.nbt.2018.10.003
Abstrakt: The phototrophic-enhanced biological phosphorus removal system (photo-EBPR) was recently proposed as an alternative photosynthetic process to conventional phosphorus removal. Previous work showed the possibility of obtaining a photo-EBPR system starting from a culture already enriched in polyphosphate accumulating organisms (PAOs). The present work evaluated whether the same could be achieved starting from conventional activated sludge. A sequencing batch reactor inoculated with sludge from a wastewater treatment plant (WWTP) was fed with a mixture of acetate and propionate (75%:25%) and subjected to dark/light cycles to select a photo-EBPR system containing PAOs and photosynthetic organisms, the oxygen providers for the system. The results showed that it is possible to obtain a photo-EBPR system starting from a WWTP sludge, although the process is slower than when started with a sludge already enriched in PAOs. After 15 days of operation, the system could remove 60 ± 2 mg-P/L of phosphorus (approximately 67% of the concentration at the end of dark period) in the light period, from which 13 ± 1 mg-P/L was removed during the phase without external air supply. These results indicate that a photo-EBPR system can be obtained independently of the seed sludge initially used, provided that a suitable operating strategy is implemented, i.e. by imposing conditions that favour the growth and coexistence of PAOs and photosynthetic microorganisms.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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