Advanced Digestion in the UK – Technology Developments and Options for Optimisation of Sludge Assets

Harrison, D.; Cumiskey, A.; Le, M.S.; Mayhew, M.; Assadi, Mahnaz Mazaheri

doi:10.2175/193864704784131572

Cited by 3 publications

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“…Each batch experiment was repeated three times (Experiments 1, 2 and 3) to demonstrate reproducibility of the results obtained. The loading rates selected were based on the full scale digester loading rates and from information on recommended OLR found in the literature for conventional, mesophilic, anaerobic digesters, ranging from 0.5 to 7.2 kg VS m -3 d -1 (Handbooks of UK Wastewater Practice 1996, Water Pollution Control Federation 1996, Brown 2002, Gerardi 2003, Harrison et al 2004, Bolzonella et al 2005, Braguglia et al 2007, Zupan i et al 2008, Cartmell and Chinaglia 2009. The proportion of feed to digested sludge varied for each batch experiment as it was based on the volatile solids content of the feed sludge in order to achieve the required loading.…”

Section: Bench Scale Batch Anaerobic Digestion Rig Operationmentioning

confidence: 99%

The effect of organic loading rate on foam initiation during mesophilic anaerobic digestion of municipal wastewater sludge

Ganidi

Tyrrel

Cartmell

2011

Bioresource Technology

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The impact of increasing organic load on anaerobic digestion foaming was studied at both full and bench scale. Organic loadings of 1.25, 2.5 and 5 kg VS m(-3) were applied to bench-scale digesters. Foaming was monitored at a full scale digester operated in a comparable organic loading range over 15 months. The bench scale batch studies identified 2.5 kg VS m(-3) as a critical threshold for foam initiation while 5 kg VS m(-3) resulted in persistent foaming. Investigation of a full scale foaming event corroborated the laboratory observation that foaming may be initiated at a loading rate of ≥ 2.5 kg VS m(-3). Experimental findings on foam composition and differences in the quality characteristics between foaming and non-foaming sludges indicated that foam initiation derived from the combined effect of the liquid and gas phases inside a digester and that the solids/biomass ultimately stabilized foaming.

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Section: Bench Scale Batch Anaerobic Digestion Rig Operationmentioning

confidence: 99%

The effect of organic loading rate on foam initiation during mesophilic anaerobic digestion of municipal wastewater sludge

Ganidi

Tyrrel

Cartmell

2011

Bioresource Technology

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Anaerobic digestion foaming causes – A review

Ganidi

Tyrrel

Cartmell

2009

Bioresource Technology

193

132

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Anaerobic digestion foaming has been encountered in several sewage treatment plants in the UK. Foaming has raised major concerns for the water companies due to significant impacts on process efficiency and operational costs. Several foaming causes have been identified over the past few years by researchers. However, the supporting experimental information is limited and in some cases absent. The present report aims to provide a detailed review of the current anaerobic digestion foaming problem and to identify gaps in knowledge regarding the theory of foam formation in anaerobic digesters.

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Emerging processes in biosolids treatment, 2005

Kelly¹

2006

Journal of Environmental Engineering and Science

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Achieving Class A treatment over Class B is becoming increasingly desirable. Most emerging new and improved processes are being promoted to meet Class A treatment objectives. Knowledge of these processes is also desirable to allow improved understanding of their current status and suitability. This paper reviews both digestion and reduction technologies and provides examples, advantages, and disadvantages for each. Key words: Class A biosolids treatment; emerging technologies; digestion: hydrolysis, thermophilic, pre-pasteurization; reduction: gasification, fuel from sludge, wet air oxidation, super critical water oxidation, hydrothermal.

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Advanced Digestion in the UK – Technology Developments and Options for Optimisation of Sludge Assets

Cited by 3 publications

References 0 publications

The effect of organic loading rate on foam initiation during mesophilic anaerobic digestion of municipal wastewater sludge

The effect of organic loading rate on foam initiation during mesophilic anaerobic digestion of municipal wastewater sludge

Anaerobic digestion foaming causes – A review

Emerging processes in biosolids treatment, 2005

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