Anaerobic digestion

Anaerobic digestion − an introduction Source: Judd Water & Wastewater Consultants / YouTube

Anaerobic digestion − an introduction to process design

Anaerobic digestion (AD) is the most extensively employed sludge stabilisation process and, as with most sludge and wastewater unit processes, the design and performance of AD depends on the feed characteristics. Professor Simon Judd explains

Sludge treatment - the anaerobic digestion process

Anaerobic digestion (AD) is the most extensively employed sludge stabilisation process, and generates a methane gas product

Biochemical pathways for converting organic matter to biogas products by anaerobic degestion

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Sludge treatment − how does anaerobic digestion work?

Anaerobic digestion is a multi-step biochemical process comprising hydrolysis, acidogenesis, acetogenesis and methanogenesis

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‘Membrane bioreactor’ (MBR) is a term used to define wastewater treatment processes where a perm-selective membrane is integrated with a suspended growth bioreactor. Find out more

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Challenges to anaerobic digestion in sludge treatment

Two widely recognised operational challenges to anaerobic digestion operation are foaming and over-acidification

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Designing anaerobic digestion systems for sludge treatment

Anaerobic digestion can be a single or multiple tank process, and employ different conditions of stirring and temperature

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Sludge pretreatment for anaerobic digestion

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Anaerobic digester treating sludge on a wastewater treatment plant

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Operating an anaerobic digester for sludge treatm…

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Sludge terms and abbreviations

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A flow diagram showing the fate water flows and heat transfer components of a combined heat and power engine, used to recover waste heat from thermal processes. Two heat streams are generated, a high-grade stream (hot, pressurised steam) and a low-grade stream (heated water), as well as electrical energy.

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Managing anaerobic digestion biogas in sludge tre…

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Flowsheet showing how anaerobic integrates with downstream processes of dewatering and hydrothermal treatment of the digestate stream, along with combined heat and power (CHP) for the biogas, for resource recovery

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Managing anaerobic digestion digestate in sludge …

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Biochemical pathways for nitrogen-containing species. Ammonia is converted to nitrogen either via nitrate (nitrification followed by denitrification), nitrogen oxide (nitritation followed by denitritation) or via the Annamox process.

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Managing anaerobic digestion supernatant in sludg…

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Schematic of intensification of AD by thermal hydrolysis, showing thickening, TH, AD and post-AD DW. Coversion of biogas be CHP engine included.

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Sludge intensification processes increase the sewage sludge solids concentration through thickening/dewatering or the biogas generation by digestion. But at what point do you stop extracting more water from the sludge or enhancing biogas production?

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