Performance of a Pilot-Scale High-Rate Anaerobic Side-stream Reactor (ASSR) Process: Minimized Sludge Production and Generation of Biogas

Eom, Heonseop; Brennan, Aaron; Watt, Chris; Chon, Dong-Hyun; Park, Chul

doi:10.2175/193864713813674234

Cited by 2 publications

(2 citation statements)

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“…Thus, these observed yields are equivalent to 1.26 and 1.17 g COD/g COD for Reactor 1 and 2, respectively. These values are greater than typical observed yields of activated sludge (0.3–0.5 g COD/g COD), , which implies phototrophic assimilation of CO 2 into the OPG biomass during SBR operation. These results imply that the OPG process has the potential to recover wastewater’s chemical energy (i.e., COD) and solar energy in the form of easily separable granular biomass.…”

Section: Resultsmentioning

confidence: 58%

The Oxygenic Photogranule Process for Aeration-Free Wastewater Treatment

Abouhend

McNair

Kuo-Dahab

et al. 2018

Environ. Sci. Technol.

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124

134

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This study presents the oxygenic photogranule (OPG) process, a light-driven process for wastewater treatment, developed based on photogranulation of filamentous cyanobacteria, nonphototrophic bacteria, and microalgae. Unlike other biogranular processes requiring airlift or upflow-based mixing, the OPG process was operated in stirred-tank reactors without aeration. Reactors were seeded with hydrostatically grown photogranules and operated in a sequencing-batch mode for five months to treat wastewater. The new reactor biomass propagated with progression of photogranulation under periodic light/dark cycles. Due to effective biomass separation from water, the system was operated with short settling time (10 min) with effective decoupling of hydraulic and solids retention times (0.75 d vs 21-42 d). During quasi-steady state, the diameter of the OPGs ranged between 0.1 and 4.5 mm. The reactors produced effluents with average total chemical oxygen demand less than 30 mg/L. Nitrogen removal (28-71%) was achieved by bioassimilation and nitrification/denitrification pathways. Oxygen needed for the oxidation of organic matter and nitrification was produced by OPGs at a rate of 12.6 ± 2.4 mg O/g biomass-h. The OPG system presents a new biogranule process, which can potentially use simple mixing and natural light to treat wastewater.

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Section: Resultsmentioning

confidence: 58%

The Oxygenic Photogranule Process for Aeration-Free Wastewater Treatment

Abouhend

McNair

Kuo-Dahab

et al. 2018

Environ. Sci. Technol.

Self Cite

124

134

View full text Add to dashboard Cite

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“…The photo-trophic biomass in the OPG generates oxygen through photosynthesis for organic oxidation or nitrification and utilizes the carbon dioxide for its growth [160] and can be operated in stirred-tank reactors without aeration [157]. Accordingly, due to photoautotrophic utilization of CO 2 , OPG managed to generate biomass 1.17-1.26 g COD/g COD that are 3-4 times more than the CAG which is 0.3-0.5 g COD/g COD [161,162]. The electricity consumption of the OPG system is 359 Wh m −3 and 269 Wh m −3 is supplied by the combustion of the produced biogas and 90 Wh m −3 by electricity from the grid [160].…”

Section: Ways Forward For Sustainable Cultivation Of Attached Microalgaementioning

confidence: 99%

Assuaging Microalgal Harvesting Woes via Attached Growth: A Critical Review to Produce Sustainable Microalgal Feedstock

et al. 2021

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Third-generation biofuels that are derived from microalgal biomass have gained momentum as a way forward in the sustainable production of biodiesel. Such efforts are propelled by the intention to reduce our dependence on fossil fuels as the primary source of energy. Accordingly, growing microalgal biomass in the form of suspended cultivation has been a conventional technique for the past few decades. To overcome the inevitable harvesting shortcomings arising from the excessive energy and time needed to separate the planktonic microalgal cells from water medium, researchers have started to explore attached microalgal cultivation systems. This cultivation mode permits the ease of harvesting mature microalgal biomass, circumventing the need to employ complex harvesting techniques to single out the cells, and is economically attractive. However, the main bottleneck associated with attached microalgal growth is low biomass production due to the difficulties the microalgal cells have in forming attachment and populating thereafter. In this regard, the current review encompasses the novel techniques adopted to promote attached microalgal growth. The physicochemical effects such as the pH of the culture medium, hydrophobicity, as well as the substratum surface properties and abiotic factors that can determine the fate of exponential growth of attached microalgal cells, are critically reviewed. This review aims to unveil the benefits of an attached microalgal cultivation system as a promising harvesting technique to produce sustainable biodiesel for lasting applications.

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Performance of a Pilot-Scale High-Rate Anaerobic Side-stream Reactor (ASSR) Process: Minimized Sludge Production and Generation of Biogas

Cited by 2 publications

References 0 publications

The Oxygenic Photogranule Process for Aeration-Free Wastewater Treatment

The Oxygenic Photogranule Process for Aeration-Free Wastewater Treatment

Assuaging Microalgal Harvesting Woes via Attached Growth: A Critical Review to Produce Sustainable Microalgal Feedstock

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