Design and Operational Considerations to Avoid Excessive Anaerobic Digester Foaming

Massart, Neil; Bates, Roderick W.; Corning, Blair; Neun, Gary

doi:10.2175/193864706783751267

Cited by 8 publications

(7 citation statements)

References 2 publications

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“…It also appears that the 25 day SRT resulted in a lower foaming potential throughout the study period. This is consistent with studies that indicate that higher organic loading of anaerobic digesters is often associated with greater potential for foaming issues (Pagilla et al, 1997;Bates et al, 2006).…”

Section: Foaming Potentialsupporting

confidence: 91%

“…From the literature and previous microscopic examination of solids during foaming and nonfoaming events, the presence of filamentous organisms has been hypothesized to be associated with foaming (Pagilla et al, 1997 andBates et al, 2006). In order to examine this factor in anaerobic digester foaming, filament counts were conducted on the various bench-scale reactors and feed mixes, as described above.…”

Section: Filament Countsmentioning

confidence: 99%

“…(Pagilla et al, 1997 andBates et al, 2006) Filamentous Organisms One of the causes of foaming listed above is filamentous organisms. The organisms implicated in foaming vary in different climates and seasons.…”

mentioning

confidence: 99%

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Madison Metropolitan Sewerage District Foaming: A Case Study of the Effects of SRT, PAX-18, Microthrix Parvicella, and Extracellular Polymeric Substances

Carroll¹,

Keadle²,

Noguera³

et al. 2013

proc water environ fed

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Anaerobic digester foaming is a common operational problem in wastewater treatment plants. Several factors contribute to foaming. This study focused on filamentous organisms and solids retention time (SRT). PAX-18, which has been used in other facilities for foaming control in activated sludge basins, was added into one treatment train at the facility of study. These solids were digested in a bench-scale anaerobic digester with a 15 day SRT and compared to others that were operated with 10, 15, and 25 day SRTs without PAX-18 treatment. It was not possible to determine if PAX-18 had a significant effect on foaming from study results. The 25 day SRT bench-scale digester had less foaming than the ones with 10 and 15 day SRTs. Higher than average extracellular polymeric substance concentrations and lower than average calcium concentrations were associated with foaming events, but this only indicates correlation, not causality.

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Section: Foaming Potentialsupporting

confidence: 91%

Section: Filament Countsmentioning

confidence: 99%

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Madison Metropolitan Sewerage District Foaming: A Case Study of the Effects of SRT, PAX-18, Microthrix Parvicella, and Extracellular Polymeric Substances

Carroll¹,

Keadle²,

Noguera³

et al. 2013

proc water environ fed

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“…As seen in Table 6, the digesters' OLR varied significantly in 2009 and 2010. Past studies have reported that variations of OLR can also be a source of foaming (Massart et al, 2006). Table 6 indicates that the gas production did not decrease as OLR was increased and mixing was reduced.…”

Section: Mixing Evaluation -Impact Of Reduced Mixing and Increased Olmentioning

confidence: 90%

Case Study of Anaerobic Digester Foaming: Effects of Mixing in Full-Scale Digesters

Miot¹,

Subramanian²,

Klibert³

et al. 2013

proc water environ fed

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Full-scale anaerobic digesters (AD`s) in three different wastewater treatment plants (WWTPs) were compared to study the effects of feeding and mixing on biogas production, total solids (TS) and temperature variation inside the digesters. In the three studies, mixing frequency was significantly reduced in both egg-shaped and cylindrical digesters. Total solids and temperature monitoring along the depth of the digesters illustrated that reducing mixing frequency by up to 75% did not significantly impact digester performance. This study demonstrates that significant energy savings can be accomplished by optimizing digester mixing without compromising performance. Reduced mixing has resulted in significant energy savings to the utilities that participated in the study.

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“…Similarly, diet can influence manure properties that lead to greater methane production potential (Cahn et al, 1998;Masse et al, 2003;Hansen et al, 2007;Jarret et al, 2011) or potentially the stabilization of foam on the surface of the manure (Kougias et al, 2013). For example, Moen (2002) and Massart et al (2006) suggested that these stabilization agents are present in complex feed mixtures (such as fats, oils, greases, and polymers), or they may be intermediate degradation compounds, such as volatile fatty acids, as proposed by Westlund et al (1998).…”

mentioning

confidence: 99%

Impact of Dietary Carbohydrate and Protein Source and Content on Swine Manure Foaming Properties

Weelden¹,

Andersen²,

Kerr³

et al. 2016

Trans. ASABE

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Diet ingredients are thought to contribute to foaming problems associated with swine manure stored in deeppit systems. Two experiments explored the impact of protein and carbohydrate sources and levels in swine diets on the physicochemical properties, methane production potential, and foaming potential of swine manure. The first experiment was specific to protein and evaluated the impact of dietary protein level and source on manure properties, while the second experiment focused on evaluating the impact of different dietary carbohydrate sources on manure foaming properties. Manure from the animals was tested for total and volatile solids, methane production rate and biochemical methane potential, surface tension, foaming capacity and stability, and microbial community structure. No single diet yielded manure with all of the anticipated qualities associated with foaming manure. However, manure collected from pigs fed diets containing soy hulls and distillers dried grains with solubles (DDGS) exhibited higher methane production rates (0.95 Â±0.20 and 0.96 Â±0.20 L CH 4 kg -1 VS, respectively) and biochemical methane potential (322 Â±25 and 269 Â±22 mL CH 4 g -1 VS, respectively) when compared to manure obtained from pigs fed the other diets. Additionally, the results showed that both protein level and source exhibited greater influence over the microbial community than carbohydrate source, with manipulations in the protein diet leading to positive correlations with specific microbial community and higher methane production rates, foaming capacity, and foam stability. In this study, these parameters appeared to be tied to higher levels of corn, or corn protein, in the diet. Although some of the microbial community was explained by diet, this study also demonstrated that factors other than diet have significant influence on microbial community. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. Authors

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Design and Operational Considerations to Avoid Excessive Anaerobic Digester Foaming

Cited by 8 publications

References 2 publications

Madison Metropolitan Sewerage District Foaming: A Case Study of the Effects of SRT, PAX-18, Microthrix Parvicella, and Extracellular Polymeric Substances

Madison Metropolitan Sewerage District Foaming: A Case Study of the Effects of SRT, PAX-18, Microthrix Parvicella, and Extracellular Polymeric Substances

Case Study of Anaerobic Digester Foaming: Effects of Mixing in Full-Scale Digesters

Impact of Dietary Carbohydrate and Protein Source and Content on Swine Manure Foaming Properties

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