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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12225

Title: Simulation of two-dimensional attainable regions and its application to model digester structures for maximum stability of anaerobic treatment process
Authors: Neba, F. Abunde
Asiedu, Nana Yaw
Addo, Ahmad
Morken, John
Østerhus, Stein W.
Seidu, Razak
Keywords: Attainable regions
Low-rate digesters
Performance targets
Digester structures
Process stability
Issue Date: Jul-2019
Publisher: Water Research
Citation: Water Research,
Abstract: Unlike high-rate anaerobic digesters that employ some mechanism to retain microbial sludge mass, lowrate systems use sufficiently long hydraulic retention times to ensure process stability, which becomes economically unattractive for treating large quantities of waste. This study presents the use of attainable region to develop a new strategy to enhance the stability of low-rate digesters. By considering three digestion cases, diary manure only (batch 1) or diary manure with granular (batch 2) or lagoon (batch) sludge as innoculum, the following findings were obtained. (1) For a given concentration of volatile acids in an anaerobic digester, higher concentrations of methanogenic archae can be attained using a digester structure (combination of different digesters) as opposed to single digester. (2) For a given digested substrate, a change in the source of inoculum results in a change in the limits of achievability by the system (attainable limits for batches 1, 2 and 3 were 46.486(g/L)2 , 5.562(g/L)2 and 0.551(g/L)2 , which resulted in performance improvements of 118.604%,175.627% and 200.436% respectively), and hence optimal digester structure. The evidence from this study suggests that the technique can be used to simultaneously improve process stability, define performance targets and propose digester structures required to achieve a given target.
Description: This article is published in Water Research and also available at https://doi.org/10.1016/j.watres.2019.114891
URI: 10.1016/j.watres.2019.114891
Appears in Collections:College of Engineering

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