Simultaneous biogas upgrading and centrate treatment in an outdoors pilot scale high rate algal pond

Posadas, Esther; Marín, David; Blanco, Saúl; Lebrero, Raquel; Muñoz, Raúl

doi:10.1016/j.biortech.2017.01.071

Cited by 102 publications

(55 citation statements)

References 26 publications

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“…On the other hand, during semi-continuous operation, N-NO 2 − increased its concentration, which, however, showed no significant differences between [46]. The N-NO x concentration achieved in this study, and in the mentioned work herein, demonstrate the ability of the photosynthetic system to promote nitrification during the growth of microalgae in anaerobic digestates [46]. Ultimately, the activity of nitrifying bacteria as Nitrosomonas and Nitrobacter explains this increase of NO x concentration [47][48][49].…”

Section: Nitrogen Removalsupporting

confidence: 46%

“…The nitrogen oxides, NO 2 and NO 3 , were not present in the reactor during the batch phase. On the other hand, during semi-continuous operation, N-NO 2 − increased its concentration, which, however, showed no significant differences between [46]. The N-NO x concentration achieved in this study, and in the mentioned work herein, demonstrate the ability of the photosynthetic system to promote nitrification during the growth of microalgae in anaerobic digestates [46].…”

Section: Nitrogen Removalsupporting

confidence: 42%

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Integration of Microalgae Cultivation in a Biogas Production Process from Organic Municipal Solid Waste: From Laboratory to Pilot Scale

et al. 2020

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In this study, the feasibility of integrating microalgae cultivation in a biogas production process that treats the organic fraction of municipal solid waste (OFMSW) was investigated. In particular, the biomass growth performances in the liquid fraction of the digestate, characterized by high ammonia concentrations and turbidity, were assessed together with the nutrient removal efficiency. Preliminary laboratory-scale experiments were first carried out in photobioreactors operating in a continuous mode (Continuous-flow Stirred-Tank Reactor, CSTR), to gain preliminary data aimed at aiding the subsequent scaling up to a pilot scale facility. An outdoor experimental campaign, operated from July to October 2019, was then performed in a pilot scale raceway pond (4.5 m2), located in Arzignano (VI), Italy, to assess the performances under real environmental conditions. The results show that microalgae could grow well in this complex substrate, although dilution was necessary to enhance light penetration in the culture. In outdoor conditions, nitrification by autotrophic bacteria appeared to be significant, while the photosynthetic nitrogen removal was around 12% with respect to the inlet. On the other hand, phosphorus was almost completely removed from the medium under all the conditions tested, and a biomass production between 2–7 g m−2 d−1 was obtained.

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Section: Nitrogen Removalsupporting

confidence: 46%

Section: Nitrogen Removalsupporting

confidence: 42%

Integration of Microalgae Cultivation in a Biogas Production Process from Organic Municipal Solid Waste: From Laboratory to Pilot Scale

et al. 2020

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“…By combining the use of agriculture residue as the feedstock and the integration of a mixed-culture PHA process into an AD-based technology chain, PHA costs could be reduced significantly with respect to PHA benchmark glucose fermentation and axenic-culture processes (Choi and Lee, 1999;Kim, 2000;Reis et al, 2011;Fava et al, 2015). Additionally, GHG saving can be increased by extending the valorisation of the residual CO 2 streams from innovative AD technologies into CO 2 consuming technologies, such as microalgae-based products (Posadas et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

A research challenge vision regarding management of agricultural waste in a circular bio-based economy

Gontard

Sonesson

Birkved

et al. 2018

Critical Reviews in Environmental Science and Technology

241

127

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Agricultural waste is a huge pool of untapped biomass resources that may even represent economic and environmental burdens. They can be converted into bioenergy and bio-based products by cascading conversion processes, within circular economy, and should be considered residual resources. Major challenges are discussed from a transdisciplinary perspective, focused on Europe situation. Environmental and economic consequences of agricultural residue management chains are difficult to assess due to their complexity, seasonality and regionality. Designing multi-criteria decision support tools, applicable at an early-stage of research, is discussed. Improvement of Anaerobic Digestion (AD), one of the most mature conversion technologies, is discussed from a technological point of view and waste feedstock geographical and seasonal variations. Using agricultural residual resources for producing high-value chemicals is a considerable challenge analysed here, taking into account innovative eco-efficient and cost-effective cascading conversion processes (bio-refinery concept). Moreover, the promotion of agricultural residuesbased business is discussed through industrial ecology, to promote synergy, on a local basis, between different agricultural and industrial value chains. Finally, to facilitate a holistic approach and optimise materials and knowledge flows KEY WORDS Agriculture; waste; eco-design; biogas; bio-based materials; circular economy CONTACT Nathalie Gontard nathalie.gontard@inra.fr UMR 1208 IATE Agro-Polymer Engineering and Emerging Technologies,

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“…1,2 Removal performances of total organic carbon, nitrogen, and phosphorus ranging from 75% to 100% have been consistently recorded in microalgal-bacterial systems treating centrate. [3][4][5][6] These processes are based on the aerobic oxidation of organic matter by heterotrophic bacteria, which produce carbon dioxide (CO 2 ) that is taken up by microalgae. Thus, microalgal photosynthesis generates the oxygen (O 2 ) required for chemical oxygen demand (COD) removal.…”

Section: Introductionmentioning

confidence: 99%

Microalgal–bacterial aggregates with flue gas supply as a platform for the treatment of anaerobic digestion centrate

Vital‐Jácome

Díaz‐Zamorano

Cuautle-Marín

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Centrate treatment using microalgal-bacterial processes might be limited by the hydraulic retention time (HRT) required to achieve satisfactory chemical oxygen demand (COD) and nutrients removal. Moreover, the poor settling of microalgal biomass still limits the technical and economic performance of microalgal-bacterial processes. In this work, the performance of microalgal-bacterial aggregates (MABAs) supplied with flue gas was investigated as an effective strategy to improve the treatment of centrate from anaerobic digestion of winery wastewater. RESULTS: MABAs supplied with flue gas achieved maximum soluble COD, N-NO 3− , P-PO 4 3− and N-NH 4 + removal efficiencies of 95%, 94%, 100%, and 100%, respectively, in five-fold centrate dilution within 7 days of operation. Centrate turbidity or its components did not hinder the performance of the MABAs under the conditions tested and no aggregates were formed in controls without MABAs inoculation. The mean diameter of the MABAs after centrate treatment was the same or even larger than that of the aggregates of the inoculum. Scanning electron microscopy analyses showed that the liquid medium composition influenced the structure and the type of microalgae cells established in the MABAs. CONCLUSION: MABAs-based centrate treatment supported by flue gas is a promising technology for improving COD and nutrients removal from centrate as well as further biomass harvesting.

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Simultaneous biogas upgrading and centrate treatment in an outdoors pilot scale high rate algal pond

Abstract: 12The bioconversion of biogas to biomethane coupled to centrate treatment was evaluated

Cited by 102 publications

References 26 publications

Integration of Microalgae Cultivation in a Biogas Production Process from Organic Municipal Solid Waste: From Laboratory to Pilot Scale

Integration of Microalgae Cultivation in a Biogas Production Process from Organic Municipal Solid Waste: From Laboratory to Pilot Scale

A research challenge vision regarding management of agricultural waste in a circular bio-based economy

Microalgal–bacterial aggregates with flue gas supply as a platform for the treatment of anaerobic digestion centrate

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