Model development and simulation for predicting risk of foaming in anaerobic digestion systems

Dalmau, Jordi; Comas, Joaquím; Rodríguez-Roda, Ignasi; Pagilla, Krishna; Steyer, Jean‐Philippe

doi:10.1016/j.biortech.2010.01.056

Cited by 34 publications

(16 citation statements)

References 26 publications

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“…Although the presence of foam causing cells have been identified in virtually all cases of foaming investigated (Kougias et al 2014;Dalmau et al 2010;Marneri et al 2009;Griffin et al 1998), however, the mere presence of foaming bacteria without the presence of the intermediate food source to the cells during AD is unlikely to cause significant foaming event (Ganidi et al 2011;Pagilla et al 1997). Therefore, foaming in conventional AD could be stemmed by rapid removal or degradation of the intermediate biosurfactants, which serve as food source to bacteria cells (Nitschke and Pastore 2006).…”

Section: Introductionmentioning

confidence: 93%

“…Since the presence of foam causing cells cannot be separated from most foaming events (Ganidi et al 2011;Dalmau et al 2010;Heard et al 2008), the main focus of this study was to find out how feed composition, OL, and C/N ratio of the FW could influence foaming events of which foaming cells are already an inherent part of. Table 3 presents the increasing range of alkalinity concentrations in the digestion medium with increase in OL and foaming.…”

Section: Effects Of Intermediate Vfa During Digestionmentioning

confidence: 99%

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Effects of feedstock carbon to nitrogen ratio and organic loading on foaming potential in mesophilic food waste anaerobic digestion

Tanimu

Ghazi

Harun

et al. 2015

Appl Microbiol Biotechnol

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Foaming problem which occurred occasionally during food waste (FW) anaerobic digestion (AD) was investigated with the Malaysian FW by stepwise increase in organic loading (OL) from 0.5 to 7.5 g VS/L. The FW feedstock with carbon to nitrogen (C/N) ratio of 17 was upgraded to C/N ratio of 26 and 30 by mixing with other wastes. The digestion which was carried out at 37 °C in 1-L batch reactors showed that foam formation initiated at OL of 1.5 g VS/L and was further enhanced as OL of feedstock was increased. The digestion foaming reached its maximum at OL of 5.5 g VS/L and did not increase further even when OL was increased to 7.5 g VS/Ld. Increase in the C/N ratio of feedstock significantly enhanced the microbial degradation activity, leading to better removal of foam causing intermediates and reduced foaming in the reactor by up to 60%.

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Section: Introductionmentioning

confidence: 93%

Section: Effects Of Intermediate Vfa During Digestionmentioning

confidence: 99%

Effects of feedstock carbon to nitrogen ratio and organic loading on foaming potential in mesophilic food waste anaerobic digestion

Tanimu

Ghazi

Harun

et al. 2015

Appl Microbiol Biotechnol

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show abstract

“…However, there is no evidence in the literature to support a relationship between digester shape and foam occurrence to date (Dalmau et al 2010). In the United States, the majority of the wastewater treatment plants use cylindrical digesters because they are more cost effective to build.…”

Section: Mixing and Digester Shapementioning

confidence: 99%

“…Egg shaped digesters have a smaller area above the bulk liquid to accumulate foam which allows some researchers to conclude that egg shaped reduces the digesters ability to have excessive foam (Metcalf and Eddy 2003). Mixing and digester shape, which is more effective in an egg shape, potentially play a critical role in the foaming potential of the anaerobic digester (Dalmau et al 2010). More research is needed.…”

Section: Mixing and Digester Shapementioning

confidence: 99%

Foaming Phenomenon in Bench‐Scale Anaerobic Digesters

Siebels

Long

2013

Water Environment Research

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The Madison Metropolitan Sewerage District (The District) in Madison, Wisconsin has been experiencing seasonal foaming in their anaerobic biosolids digesters, which has occurred from mid‐November to late June for the past few years. The exact cause(s) of foaming is unknown. Previous research findings are unclear as to whether applications of advanced anaerobic digestion processes reduce the foaming potential of digesters. The object of this study was to investigate how configurations of thermophilic and acid phase‐thermophilic anaerobic digestion would affect foaming at the bench‐scale level compared to single stage mesophilic digestion for The District. Bench‐scale anaerobic digesters were fed with a 4 to 4.5% by dry weight of solids content blend of waste activated sludge (WAS) and primary sludge from The District. Foaming potential was monitored using Alka‐Seltzer and aeration foaming tests. The bench‐scale acid phase‐thermophilic digester had a higher foaming potential than the bench‐scale mesophilic digester. These results indicate that higher temperatures increase the foaming potential of the bench‐scale anaerobic digesters. The bench‐scale acid phase‐thermophilic digesters had a greater percent (approximately 5 to 10%) volatile solids destruction and a greater percent (approximately 5 to 10%) total solids destruction when compared to the bench‐scale mesophilic digester. Overall, for the full‐scale foaming experienced by The District, it appears that adding an acid phase or switching to thermophilic digestion would not alleviate The District's foaming issues.

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“…Thus, sludge bulking is one of the most studied problems of WWTPs. Predicting sludge bulking is a subject of growing importance around the world such that better understanding of sludge characteristic is improved for a better treatment plants control [9]. In order to identify sludge bulking, a lot of researchers have studied the microbial population and search for the predominant filamentous bacteria responsible to improve the process.…”

Section: Introductionmentioning

confidence: 99%

Prediction of activated sludge bulking based on a self-organizing RBF neural network

Han

Qiao

2012

Journal of Process Control

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Model development and simulation for predicting risk of foaming in anaerobic digestion systems

Cited by 34 publications

References 26 publications

Effects of feedstock carbon to nitrogen ratio and organic loading on foaming potential in mesophilic food waste anaerobic digestion

Effects of feedstock carbon to nitrogen ratio and organic loading on foaming potential in mesophilic food waste anaerobic digestion

Foaming Phenomenon in Bench‐Scale Anaerobic Digesters

Prediction of activated sludge bulking based on a self-organizing RBF neural network

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