Stability studies of thermophilic anaerobic sludges under suboptimal feeding conditions and temperatures

Obaya, M.C; Valdés, E; Ramos, José Gustavo Venâncio da Silva

doi:10.1002/abio.370140213

Cited by 5 publications

(1 citation statement)

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“…Reactor processes are considered stable in the respective FOL (mesophilic: 37 C to 43 C) and (thermophilic: 43 C to 55 C). 73,74 Studies were conducted by Obaya et al, 75 Chae et al, 76 Ahn and Foster, 77 Lau and Fang, 78 and El-Mashad et al, 79 on temperature fluctuations in thermophilic fermenter conditions as well as on mesophilic fermenter conditions by Chae et al, 76 and Ahn and Foster. 77 Good process stability was demonstrated for fluctuations within these temperature limits.…”

Section: Conversion Processesmentioning

confidence: 99%

Options for demand side management in biofuel production: A systematic review

Röder

Gröngröft

Grünewald

et al. 2022

Intl J of Energy Research

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Summary To minimize the emissions from the production of biofuels, one aim is to reduce or completely replace the amount of fossil fuels used for internal process energy. A conceivable solution is the use of volatile renewable energy sources such as solar and wind. The fluctuation of these energy sources in their production inevitably leads to a transformation to flexible power consumption, commonly referred to as demand side management (DSM). In current research, a wide range of processes has been identified to be suitable for DSM application. Although biorefineries have not yet been tested for DSM application, it is noteworthy that many of the DSM suitable processes are employed in biofuel plants. Thus, this contribution offers a comprehensive overview of DSM options drawn from literature with a special focus on process steps, which have been analysed for operational and capacity flexibility and which are found in or are transferable to biorefinery systems. By identifying process steps in biofuel production that can be operated flexibly, this extensive literature study helps to find technical restrictions limiting the overall process flexibility. The scope of this contribution is to create an overview of which processes in biofuel production can be considered for DSM use.

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Section: Conversion Processesmentioning

confidence: 99%

Options for demand side management in biofuel production: A systematic review

Röder

Gröngröft

Grünewald

et al. 2022

Intl J of Energy Research

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Effect of Low Temperatures on the Performance of an Anaerobic Baffled Reactor (ABR)

Nachaiyasit

Stuckey

1997

J. Chem. Technol. Biotechnol.

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The effect of a decrease in operating temperature on the performance of two 10 dm3 anaerobic baffled reactors (ABR) was examined in terms of steady state chemical oxygen demand (COD) removal efficiency. To minimise variations, and have a totally biodegradable feed, a synthetic carbohydrate (sucrose)–protein (meat extract) substrate was used. The reactors were operated at 20 h hydraulic retention time (HRT), 4 g dm−3 COD, and 35°C as a base‐line condition. Because of their different histories, the reactors responded differently to a decrease in operating temperature to 25°C. Reactor 1 remained stable at 97% COD removal, whereas Reactor 2 decreased to 93% removal, but rose to 97% after adding an effluent recycle of 0·25. At 15°C, the efficiency of Reactor 1 dropped to 75%, while the removal of Reactor 2 declined to 83%, and no improvement in efficiency occurred with an effluent recycle at 0·25. At 25°C, the decreased rate of catabolism of the slow‐growing syntrophs and methanogens resulted in a shift of the volatile fatty acids (VFA) peak to the second compartment. However, the biomass present in the reactor prevented VFAs breaking through in the effluent. Nevertheless, at 15°C VFAs were present in the effluent, perhaps due to the lower rates of metabolism and an increase in the Ks for VFAs. Finally, at 15°C part of the increase in the effluent COD was due to the enhanced production of soluble microbial products (SMP), or a decrease in their metabolism, with these compounds constituting some 10% of the inlet COD. © 1997 SCI.

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