Co-digestion of food waste in municipal wastewater treatment plants: Effect of different mixtures on methane yield and hydrolysis rate constant

Koch, Konrad; Helmreich, Brigitte; Drewes, Jörg E.

doi:10.1016/j.apenergy.2014.10.025

Cited by 175 publications

(64 citation statements)

References 27 publications

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“…This data is in line with literature works on co-digestion, where a 50:50 VS/TS ratio is usually proposed (Mattioli et al, 2014;Koch et al, 2015;Kim et al, 2016;Arnò et al, 2017). The biogas production increases by 151% thanks to codigestion.…”

Section: Sludge Co-digestion With Ofmswsupporting

confidence: 80%

Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Gandiglio

Lanzini

Soto

et al. 2017

Front. Environ. Sci.

104

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The present work provides an overview of technological measures to increase the self-sufficiency of wastewater treatment plants (WWTPs), in particular for the largely diffused activated sludge-based WWTP. The operation of WWTPs entails a huge amount of electricity. Thermal energy is also required for pre-heating the sludge and sometimes exsiccation of the digested sludge. On the other hand, the entering organic matter contained in the wastewater is a source of energy. Organic matter is recovered as sludge, which is digested in large stirred tanks (anaerobic digester) to produce biogas. The onsite availability of biogas represents a great opportunity to cover a significant share of WWTP electricity and thermal demands. Especially, biogas can be efficiently converted into electrical energy (and heat) via high temperature fuel cell generators. The final part of this work will report a case study based on the use of sewage biogas into a solid oxide fuel cell. However, the efficient biogas conversion in combined heat and power (CHP) devices is not sufficient. Self-sufficiency requires a combination of efficient biogas conversion, the maximization the yield of biogas from the organic substrate, and the minimization of the thermal duty connected to the preheating of the sludge feeding the anaerobic digester (generally achieved with pre-thickeners). Finally, the co-digestion of the organic fraction of municipal solid waste (OFMSW) into digesters treating sludge from WWTPs represent an additional opportunity for increasing the biogas production of existing WWTPs, thus helping the transition toward self-sufficient plants.

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Section: Sludge Co-digestion With Ofmswsupporting

confidence: 80%

Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Gandiglio

Lanzini

Soto

et al. 2017

Front. Environ. Sci.

104

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“…Activated sludge samples from a WWTP in Garching, Germany, next to the Technical University of Munich (TUM), were collected from the denitrifying basin, which receives clarified nitraterich effluent from an upstream trickling filter (38). Biofilm carriers from the WWTP in Kempten, Germany, were collected from the deammonification basin (22).…”

Section: Methodsmentioning

confidence: 99%

Unexpected Diversity and High Abundance of Putative Nitric Oxide Dismutase (Nod) Genes in Contaminated Aquifers and Wastewater Treatment Systems

Zhu

Bradford

Huang

et al. 2017

Appl Environ Microbiol

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It has recently been suggested that oxygenic dismutation of NO into N 2 and O 2 may occur in the anaerobic methanotrophic "Candidatus Methylomirabilis oxyfera" and the alkane-oxidizing gammaproteobacterium HdN1. It may represent a new pathway in microbial nitrogen cycling catalyzed by a putative NO dismutase (Nod). The formed O 2 enables microbes to employ aerobic catabolic pathways in anoxic habitats, suggesting an ecophysiological niche space of substantial appeal for bioremediation and water treatment. However, it is still unknown whether this physiology is limited to "Ca. Methylomirabilis oxyfera" and HdN1 and whether it can be coupled to the oxidation of electron donors other than alkanes. Here, we report insights into an unexpected diversity and remarkable abundance of nod genes in natural and engineered water systems. Phylogenetically diverse nod genes were recovered from a range of contaminated aquifers and N-removing wastewater treatment systems. Together with nod genes from "Ca. Methylomirabilis oxyfera" and HdN1, the novel environmental nod sequences formed no fewer than 6 well-supported phylogenetic clusters, clearly distinct from canonical NO reductase (quinoldependent NO reductase [qNor] and cytochrome c-dependent NO reductase [cNor]) genes. The abundance of nod genes in the investigated samples ranged from 1.6 ϫ 10 7 to 5.2 ϫ 10 10 copies · g Ϫ1 (wet weight) of sediment or sludge biomass, accounting for up to 10% of total bacterial 16S rRNA gene counts. In essence, NO dismutation could be a much more widespread physiology than currently perceived. Understanding the controls of this emergent microbial capacity could offer new routes for nitrogen elimination or pollutant remediation in natural and engineered water systems.IMPORTANCE NO dismutation into N 2 and O 2 is a novel process catalyzed by putative NO dismutase (Nod). To date, only two bacteria, the anaerobic methaneoxidizing bacterium "Ca. Methylomirabilis oxyfera" and the alkane-oxidizing gammaproteobacterium HdN1, are known to harbor nod genes. In this study, we report efficient molecular tools that can detect and quantify a wide diversity of nod genes in environmental samples. A surprisingly high diversity and abundance of nod genes were found in contaminated aquifers as well as wastewater treatment systems. This evidence indicates that NO dismutation may be a much more widespread physiology in natural and man-made environments than currently perceived. The molecular tools presented here will facilitate further studies on these enigmatic microbes in the future.KEYWORDS nitric oxide (NO) dismutation, NO dismutase, oxygenic denitrification,

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“…However, due to their limited duration and mode of operation, batch tests are less suitable to provide information regarding possible positive or negative synergistic effects due to mixing of different substrates (VDI 4630, 2006). Nevertheless, Koch et al (2015b) reported that although batch tests are limited in assessing synergistic effects on methane yield, they are suitable to evaluate changes on degradation kinetics and the formation of methane. Using batch tests, Labatut et al (2011) observed changes in the specific methane yield (SMY) in co-digestion of several substrates in relation to the weighted average of the individual substrates' SMY and reported both synergistic and antagonistic effects.…”

Section: Introductionmentioning

confidence: 99%

“…According to Koch et al (2015b), co-digestion of raw sludge with food waste is recommended up to a ratio of 12% (w/w) or 35% (based on volatile solids, VS), respectively. Co-digestion can result not only in a higher methane yield (which is just caused by the higher methane yield of food waste compared to raw sewage sludge), but also in an accelerated methane production.…”

Section: Introductionmentioning

confidence: 99%

Co-digestion of food waste in a municipal wastewater treatment plant: Comparison of batch tests and full-scale experiences

Koch

Plabst

Schmidt³

et al. 2016

Waste Management

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128

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Co-digestion of food waste in municipal wastewater treatment plants: Effect of different mixtures on methane yield and hydrolysis rate constant

Cited by 175 publications

References 27 publications

Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Unexpected Diversity and High Abundance of Putative Nitric Oxide Dismutase (Nod) Genes in Contaminated Aquifers and Wastewater Treatment Systems

Co-digestion of food waste in a municipal wastewater treatment plant: Comparison of batch tests and full-scale experiences

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