Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion

Biogas is one type of renewable energy that can be produced from substrates in the form of industrial waste. Biogas formation is a complex series of biochemical processes and involves many types of anaerobic micro-organisms. In an anaerobic digester, synthropic reactions are considered to be the...

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Main Authors:	Sinaga, Nazar, Mel, Maizirwan, Pakpahan, Rezeki, Che Sidik, Nor Azwadi
Format:	Article
Language:	English
Published:	Akademia Baru 2017
Subjects:	TP Chemical technology TP248.13 Biotechnology
Online Access:	http://irep.iium.edu.my/62109/ http://irep.iium.edu.my/62109/ http://irep.iium.edu.my/62109/1/ARBBV1_N1_P26_43.pdf

id	iium-62109
recordtype	eprints
spelling	iium-621092018-02-20T04:07:39Z http://irep.iium.edu.my/62109/ Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion Sinaga, Nazar Mel, Maizirwan Pakpahan, Rezeki Che Sidik, Nor Azwadi TP Chemical technology TP248.13 Biotechnology Biogas is one type of renewable energy that can be produced from substrates in the form of industrial waste. Biogas formation is a complex series of biochemical processes and involves many types of anaerobic micro-organisms. In an anaerobic digester, synthropic reactions are considered to be the process steps that limit the formation of this biogas. This study aims to study the effect of volatile fatty acid substrate concentration (VFA) on the biogas production rate in a digester tank equipped with Rushton Impeller 6 bladed type mixer, which is rotated at a constant speed of 100 rpm. The simulations were performed in 3 dimensions under transient conditions using computational fluid dynamic (CFD) methods that are tied to the equilibrium equations of the synthropic reaction population (acetogenesis and methanogenesis) in the stirred reactor. This simulation uses a 3-phase Eulerian model and a k-epsilon RNG turbulence model to solve the momentum equation, species transport and population balance equation. The preferred solution method is PC-SIMPLE with First Order Upwind discretization. In this study 8 variations of substrate concentration were simulated. The validation results of the previous research showed very close results, with the difference is less than 1%. Hence, the VFA degradation process occurs efficiently and the VFA concentration profile in the 3-phase system is a heterogeneous flow pattern, so it is concluded that the calculation model used can be used to predict the biogas production rate quite well. Based on the simulation results of 8 types of VFA substrate concentrations observed after 70 seconds, it was found that the production and concentration of methane in biogas varied between 17.62% (variation-6) to 22.96% (variation-5). The biogas production varies between 0.61 g/l (reference model) to 0.95 g/l (variation-3). With this investigation, it can be done by simulation to get optimal mixer design, according to the type of substrate used and operating conditions of the digester. Akademia Baru 2017-12 Article PeerReviewed application/pdf en http://irep.iium.edu.my/62109/1/ARBBV1_N1_P26_43.pdf Sinaga, Nazar and Mel, Maizirwan and Pakpahan, Rezeki and Che Sidik, Nor Azwadi (2017) Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion. Journal of Advanced Research in Biofuel and Bioenergy, 1 (1). pp. 26-43. ISSN 2600-8459 http://www.akademiabaru.com/doc/ARBBV1_N1_P26_43.pdf
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TP Chemical technology TP248.13 Biotechnology
spellingShingle	TP Chemical technology TP248.13 Biotechnology Sinaga, Nazar Mel, Maizirwan Pakpahan, Rezeki Che Sidik, Nor Azwadi Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion
description	Biogas is one type of renewable energy that can be produced from substrates in the form of industrial waste. Biogas formation is a complex series of biochemical processes and involves many types of anaerobic micro-organisms. In an anaerobic digester, synthropic reactions are considered to be the process steps that limit the formation of this biogas. This study aims to study the effect of volatile fatty acid substrate concentration (VFA) on the biogas production rate in a digester tank equipped with Rushton Impeller 6 bladed type mixer, which is rotated at a constant speed of 100 rpm. The simulations were performed in 3 dimensions under transient conditions using computational fluid dynamic (CFD) methods that are tied to the equilibrium equations of the synthropic reaction population (acetogenesis and methanogenesis) in the stirred reactor. This simulation uses a 3-phase Eulerian model and a k-epsilon RNG turbulence model to solve the momentum equation, species transport and population balance equation. The preferred solution method is PC-SIMPLE with First Order Upwind discretization. In this study 8 variations of substrate concentration were simulated. The validation results of the previous research showed very close results, with the difference is less than 1%. Hence, the VFA degradation process occurs efficiently and the VFA concentration profile in the 3-phase system is a heterogeneous flow pattern, so it is concluded that the calculation model used can be used to predict the biogas production rate quite well. Based on the simulation results of 8 types of VFA substrate concentrations observed after 70 seconds, it was found that the production and concentration of methane in biogas varied between 17.62% (variation-6) to 22.96% (variation-5). The biogas production varies between 0.61 g/l (reference model) to 0.95 g/l (variation-3). With this investigation, it can be done by simulation to get optimal mixer design, according to the type of substrate used and operating conditions of the digester.
format	Article
author	Sinaga, Nazar Mel, Maizirwan Pakpahan, Rezeki Che Sidik, Nor Azwadi
author_facet	Sinaga, Nazar Mel, Maizirwan Pakpahan, Rezeki Che Sidik, Nor Azwadi
author_sort	Sinaga, Nazar
title	Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion
title_short	Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion
title_full	Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion
title_fullStr	Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion
title_full_unstemmed	Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion
title_sort	influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion
publisher	Akademia Baru
publishDate	2017
url	http://irep.iium.edu.my/62109/ http://irep.iium.edu.my/62109/ http://irep.iium.edu.my/62109/1/ARBBV1_N1_P26_43.pdf
first_indexed	2023-09-18T21:28:03Z
last_indexed	2023-09-18T21:28:03Z
_version_	1777412324533993472

Influence of volatile fatty acid concentration on biogas production in synthropic anaerobic digestion

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