Factorial experimental design to enhance methane production of dairy wastes co-digestion

Factorial design was used to investigate the parameters involved in co-digestion mixture of dairy wastes (from a Moroccan dairy industry) in order to improve methane production of this mixture. Indeed, evaluation of methane yield as a function of three parameters (pH, inoculum and organic load) show...

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Main Authors:	Saaida Lhanafi, Zakaria Anfar, Bouchra Chebli, Mohamed Benafqir, Rachid El Haouti, Youness Azougarh, Mohamed Abbaz, Noureddine El Alem
Format:	Article
Language:	English
Published:	BMC 2018-11-01
Series:	Sustainable Environment Research
Online Access:	http://www.sciencedirect.com/science/article/pii/S2468203917301747

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spelling	doaj-9748bd476d104757adf2e38d87f778ed2020-11-25T03:34:46ZengBMCSustainable Environment Research2468-20392018-11-01286389395Factorial experimental design to enhance methane production of dairy wastes co-digestionSaaida Lhanafi0Zakaria Anfar1Bouchra Chebli2Mohamed Benafqir3Rachid El Haouti4Youness Azougarh5Mohamed Abbaz6Noureddine El Alem7Department of Chemistry, University Ibn Zohr, Agadir 8106, Morocco; Process Engineering and Energy and Environment, University Ibn Zohr, Agadir 80000, Morocco; Corresponding author. Department of Chemistry, University Ibn Zohr, Agadir 8106, Morocco.Department of Chemistry, University Ibn Zohr, Agadir 8106, MoroccoProcess Engineering and Energy and Environment, University Ibn Zohr, Agadir 80000, MoroccoDepartment of Chemistry, University Ibn Zohr, Agadir 8106, MoroccoDepartment of Chemistry, University Ibn Zohr, Agadir 8106, MoroccoDepartment of Chemistry, University Ibn Zohr, Agadir 8106, MoroccoDepartment of Chemistry, University Ibn Zohr, Agadir 8106, MoroccoDepartment of Chemistry, University Ibn Zohr, Agadir 8106, MoroccoFactorial design was used to investigate the parameters involved in co-digestion mixture of dairy wastes (from a Moroccan dairy industry) in order to improve methane production of this mixture. Indeed, evaluation of methane yield as a function of three parameters (pH, inoculum and organic load) showed the correlation between the experimental and statistical data in terms of pH 8 and inoculum 1 (constituted by sludge diluted in 1 L of basal medium of methanogenic bacteria, in addition to formic acid (5 mL L−1), propionic acid (5 mL L−1), lactic acid (5 mL L−1) and micro-nutrient (10 mL L−1)) as optimum parameters. However, a discrepancy was detected about organic load. The interaction between parameters had a positive effect on methane yield because it led to produce experimentally a maximum methane using the higher load (3.44 g VS). These results allow selecting the parameters for the improvement of methane production. Furthermore, the validity of the fitting model to describe and improve the efficiency of dairy wastes co-digestion was investigated. In addition, an abatement of 89% of volatile solids was observed and the mineral solids was increased from 4 to 7.2 g L−1, which is important of digestat value as fertilizer. Keywords: Factorial design, Co-digestion, Dairy wastes, Improvement, Methane productionhttp://www.sciencedirect.com/science/article/pii/S2468203917301747
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Saaida Lhanafi Zakaria Anfar Bouchra Chebli Mohamed Benafqir Rachid El Haouti Youness Azougarh Mohamed Abbaz Noureddine El Alem
spellingShingle	Saaida Lhanafi Zakaria Anfar Bouchra Chebli Mohamed Benafqir Rachid El Haouti Youness Azougarh Mohamed Abbaz Noureddine El Alem Factorial experimental design to enhance methane production of dairy wastes co-digestion Sustainable Environment Research
author_facet	Saaida Lhanafi Zakaria Anfar Bouchra Chebli Mohamed Benafqir Rachid El Haouti Youness Azougarh Mohamed Abbaz Noureddine El Alem
author_sort	Saaida Lhanafi
title	Factorial experimental design to enhance methane production of dairy wastes co-digestion
title_short	Factorial experimental design to enhance methane production of dairy wastes co-digestion
title_full	Factorial experimental design to enhance methane production of dairy wastes co-digestion
title_fullStr	Factorial experimental design to enhance methane production of dairy wastes co-digestion
title_full_unstemmed	Factorial experimental design to enhance methane production of dairy wastes co-digestion
title_sort	factorial experimental design to enhance methane production of dairy wastes co-digestion
publisher	BMC
series	Sustainable Environment Research
issn	2468-2039
publishDate	2018-11-01
description	Factorial design was used to investigate the parameters involved in co-digestion mixture of dairy wastes (from a Moroccan dairy industry) in order to improve methane production of this mixture. Indeed, evaluation of methane yield as a function of three parameters (pH, inoculum and organic load) showed the correlation between the experimental and statistical data in terms of pH 8 and inoculum 1 (constituted by sludge diluted in 1 L of basal medium of methanogenic bacteria, in addition to formic acid (5 mL L−1), propionic acid (5 mL L−1), lactic acid (5 mL L−1) and micro-nutrient (10 mL L−1)) as optimum parameters. However, a discrepancy was detected about organic load. The interaction between parameters had a positive effect on methane yield because it led to produce experimentally a maximum methane using the higher load (3.44 g VS). These results allow selecting the parameters for the improvement of methane production. Furthermore, the validity of the fitting model to describe and improve the efficiency of dairy wastes co-digestion was investigated. In addition, an abatement of 89% of volatile solids was observed and the mineral solids was increased from 4 to 7.2 g L−1, which is important of digestat value as fertilizer. Keywords: Factorial design, Co-digestion, Dairy wastes, Improvement, Methane production
url	http://www.sciencedirect.com/science/article/pii/S2468203917301747
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Factorial experimental design to enhance methane production of dairy wastes co-digestion

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