Influence of Organic Loading Rate on the Process Imbalance of Anaerobic Digestion with Food Waste

The use of volatile fatty acids (VFAs) as process indicators in biogas reactors treating Food Waste (FW) was studied. The aim of this work was to determine a reliable parameter which could be used as an indicator of process imbalance during anaerobic digestion of FW in the continuously stirred tank reactors (CSTR) anaerobic reactor. It can be concluded from this that not only VFAs concentrations are indicator for process imbalance during anaerobic digestion of FW, but also VFAs changes constitute the most important indicators of early warning of process imbalances.

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Single-Stage and Two-Stage Anaerobic Digestion of Food Waste: Effect of the Organic Loading Rate on the Methane Production and Volatile Fatty Acids

Water Air & Soil Pollution ◽

10.1007/s11270-021-05064-9 ◽

2021 ◽

Vol 232 (3) ◽

Author(s):

Brayan Alexis Parra-Orobio ◽

Mariano Nicolas Cruz-Bournazou ◽

Patricia Torres-Lozada

Keyword(s):

Fatty Acids ◽

Anaerobic Digestion ◽

Food Waste ◽

Methane Production ◽

Volatile Fatty Acids ◽

Loading Rate ◽

Single Stage ◽

Organic Loading Rate ◽

Organic Loading ◽

Two Stage

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Adjusting Organic Load as a Strategy to Direct Single-Stage Food Waste Fermentation from Anaerobic Digestion to Chain Elongation

Processes ◽

10.3390/pr8111487 ◽

2020 ◽

Vol 8 (11) ◽

pp. 1487

Author(s):

Vicky De Groof ◽

Marta Coma ◽

Tom C. Arnot ◽

David J. Leak ◽

Ana B. Lanham

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Loading Rate ◽

Biogas Production ◽

Single Stage ◽

Stirred Tank ◽

Chain Elongation ◽

Organic Loading Rate ◽

Organic Loading ◽

Operating Strategy

Production of medium chain carboxylic acids (MCCA) as renewable feedstock bio-chemicals, from food waste (FW), requires complicated reactor configurations and supplementation of chemicals to achieve product selectivity. This study evaluated the manipulation of organic loading rate in an un-supplemented, single stage stirred tank reactor to steer an anaerobic digestion (AD) microbiome towards acidogenic fermentation (AF), and thence to chain elongation. Increasing substrate availability by switching to a FW feedstock with a higher COD stimulated chain elongation. The MCCA species n-caproic (10.1 ± 1.7 g L−1) and n-caprylic (2.9 ± 0.8 g L−1) acid were produced at concentrations comparable to more complex reactor set-ups. As a result, of the adjusted operating strategy, a more specialised microbiome developed containing several MCCA-producing bacteria, lactic acid-producing Olsenella spp. and hydrogenotrophic methanogens. By contrast, in an AD reactor that was operated in parallel to produce biogas, the retention times had to be doubled when fed with the high-COD FW to maintain biogas production. The AD microbiome comprised a diverse mixture of hydrolytic and acidogenic bacteria, and acetoclastic methanogens. The results suggest that manipulation of organic loading rate and food-to-microorganism ratio may be used as an operating strategy to direct an AD microbiome towards AF, and to stimulate chain elongation in FW fermentation, using a simple, un-supplemented stirred tank set-up. This outcome provides the opportunity to repurpose existing AD assets operating on food waste for biogas production, to produce potentially higher value MCCA products, via simple manipulation of the feeding strategy.

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Effects of temperature, proportion and organic loading rate on the performance of anaerobic digestion of food waste

Biotechnology Reports ◽

10.1016/j.btre.2020.e00503 ◽

2020 ◽

Vol 27 ◽

pp. e00503

Author(s):

Jandir Pereira Blasius ◽

Ronan Cleber Contrera ◽

Sandra Imaculada Maintinguer ◽

Marcus Cesar Avezum Alves de Castro

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Loading Rate ◽

Organic Loading Rate ◽

Organic Loading ◽

Effects Of Temperature

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Volatile fatty acids production from food waste: Effects of pH, temperature, and organic loading rate

Bioresource Technology ◽

10.1016/j.biortech.2013.06.025 ◽

2013 ◽

Vol 143 ◽

pp. 525-530 ◽

Cited By ~ 230

Author(s):

Jianguo Jiang ◽

Yujing Zhang ◽

Kaimin Li ◽

Quan Wang ◽

Changxiu Gong ◽

...

Keyword(s):

Fatty Acids ◽

Food Waste ◽

Volatile Fatty Acids ◽

Loading Rate ◽

Organic Loading Rate ◽

Organic Loading ◽

Effects Of Ph

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Two-phase Anaerobic Digestion of Food Waste Leachate Due to Organic Loading Rate at Thermophilic and Mesophilic Temperature

Journal of Korean Society of Water Science and Technology ◽

10.17640/kswst.2019.27.4.3 ◽

2019 ◽

Vol 27 (4) ◽

pp. 3-13

Author(s):

Hye-Lin Park ◽

Jun-Gyu Park ◽

Eui-Hwan Hong ◽

Hang-Bae Jun

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Loading Rate ◽

Organic Loading Rate ◽

Organic Loading ◽

Two Phase ◽

Food Waste Leachate ◽

Mesophilic Temperature ◽

Waste Leachate

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Potential production of struvite from the anaerobic digestion of food waste: analysis in one-phase and two-phase configurations

Water Science & Technology ◽

10.2166/wst.2021.299 ◽

2021 ◽

Author(s):

Brayan Alexis Parra-Orobio ◽

Andrea Pérez-Vidal ◽

Patricia Torres-Lozada

Keyword(s):

Anaerobic Digestion ◽

Food Waste ◽

Loading Rate ◽

Organic Amendments ◽

Organic Loading Rate ◽

Type B ◽

Organic Loading ◽

Regulatory Requirements ◽

Potential Production ◽

Two Phase

Abstract Anaerobic digestion (AD) of food waste (FW) has been gaining more interest as it has potential for the production of organic amendments with high struvite (NH4MgPO4·6H2O) content, which is a nutrient of great interest in sustainable agriculture. In this study, the influence of AD of FW in one- and two-phase configurations on methane production and the potential for struvite formation using digestate, was evaluated. It was found that the two-phase is a more efficient as its organic loading rate is 18% higher than that of one-phase configuration. In addition, the two-phase yielded a higher methane content in biogas (>60%) and a higher organic matter transformation in each of the AD stages (>20%); further, the digestate complied with the regulatory requirements for the use of organic amendments, thereby being deemed as a Type-B material with a struvite precipitation potential, exceeding 80%, as opposed to the digestate from one-phase configuration, which may represent a revenue of up to US$ 26,505 per year.

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