Just Suspended Speed for Solid Particle Transport in TorusReactor

Alouache, Ali; Selatnia, A.; Halet, Farid; Lefkir, Abdelouahab; Sayah, Houssem Eddine; Nadjemi, Boubekeur

doi:10.1007/978-3-319-99867-1_152

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“…In OPG reactors, the optimal photochemical capacity determined via POE experiments and dependent on growth irradiances can be lessened by variable particle flow within the reactor. , The mixing speed influences the frequency of “OPGs to see light” events , and longer exposures to supra saturating irradiances generally above 1000–1200 μmol m –2 s –1 can result in photoinhibition. ,, Extended periods in the dark facilitate recovery from photoinhibition but can also lead to elevated respiration. ,, Self-shading effects resulting from particle interaction in relation to the optical path also depend on the size and biomass concentrations (Figure ). A priori, the bulk-fluid mixing pattern is a function of reactor size, impeller design, and mixing intensity.…”

Section: Resultsmentioning

confidence: 99%

Section: Source Of Oxygenic Photogranules (Opgs)mentioning

confidence: 99%

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In Vivo Evaluation of Oxygenic Photogranules’ Photosynthetic Capacity by Pulse Amplitude Modulation and Phototrophic–Irradiance Curves

et al. 2021

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The commingled microbial moiety of oxygenic photogranules (OPGs) facilitates aeration-free wastewater treatment. Embedded in an extracellular polymeric substances (EPS) matrix, microbial producers and consumers of oxygen occupying granular niches exchange substrates among themselves and with the bulk fluid. An assessment of the OPG's phototrophic potential or functional capacity may require combining different photoactivity signals. The photosynthetic capacity was evaluated using photosynthetic oxygen evolution (POE) and chlorophyll fluorescence (rapid light curves, RLC) measurements using OPGs grown at different light intensities.. A maximum oxygen generating capacity for optimal OPGs and reactor conditions was determined to be 284.4 mg O 2 g VSS −1 h −1 The OPGs exhibited photoelasticity, with higher photosynthetic capacity in high light (HL) compared to that in low light (LL) adapted samples. Saturation irradiances before the onset of photoinhibition for LL and HL samples were 1000 and 1200 μmol m −2 s −1 , respectively using POE signals, and 478 μmol m −2 s −1 and 611 μmol m −2 s −1 using RLC signals. Moreover, HL adapted samples had higher nonphotochemical quenching rates which allude to the OPG's photoelastic potential. The correlation coefficients (κ) between POE and RLCs were lower than reported values for pure microbial cultures reflecting the enhanced contribution from different photosynthetic clades with a variety of light-harvesting pigments present in OPGs. In an OPG reactor, the photochemical activity can be influenced by the granular size, granular ecology, and reactor operation metrics related to irradiance interactions such as mixing, self-shading, light intensity, photoperiods, and reactor depth. This presents opportunities for design of intensive wastewater resource recovery using phototrophic granular biomass.

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