Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion

Background and Objective: Hydrolysis of fat, oil and grease by ultrasonic waves is a pre-treatment method before anaerobic digestion which can change their physical, chemical and biological properties. The main purpose of this study was to investigate the efficiency of ultrasonic waves to improve th...

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Autores principales:	Reza Barati Rashvanlou, Mahdi Farzadkia, Abbas Ali Moserzadeh
Formato:	article
Lenguaje:	FA
Publicado:	Tehran University of Medical Sciences 2021
Materias:	municipal wastewater fat oil and grease lipase enzyme ultrasonic and anaerobic digester Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/158ddd52f6844a00b40ca467973ab807
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spelling	oai:doaj.org-article:158ddd52f6844a00b40ca467973ab8072021-11-21T04:53:48ZEvaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion2008-20292008-3718https://doaj.org/article/158ddd52f6844a00b40ca467973ab8072021-05-01T00:00:00Zhttp://ijhe.tums.ac.ir/article-1-6521-en.htmlhttps://doaj.org/toc/2008-2029https://doaj.org/toc/2008-3718Background and Objective: Hydrolysis of fat, oil and grease by ultrasonic waves is a pre-treatment method before anaerobic digestion which can change their physical, chemical and biological properties. The main purpose of this study was to investigate the efficiency of ultrasonic waves to improve the hydrolysis process and its use as an auxiliary substrate to increase the efficiency of anaerobic digestion process along with municipal sewage sludge. Materials and Methods: Sampling of fat and oil of the degreasing unit and physical preparation by conducting ultrasonic waves with frequencies of 20 kHz and current density of 0.012-0.14 W/mL within 0-12 min were performed. The efficiency of pretreatment process were performed through tests such as soluble chemical oxygen demand (SCOD), and lipase enzyme activity. In addition, the anaerobic digestion process were evaluated by measuring the TS, VS, VA (volatile acidity), alkalinity, biogas production and biogas methane content. Results: The results showed that the highest increase in the activity of lipase enzyme under ultrasonic effect with a power of 0.1 w/mL was obtained after 8 minutes. Organic loading with 10%, 20% and 40% FOG/MSS ratios: resulted in 55%, 66% and 64% increase in methane production compared to the control samples, respectively. Organic loading over the 40% FOG/MSS caused a limitation in the simultaneous digestion process. Conclusion: The results show that ultrasonic wave pretreatment with optimal power and time can improve the hydrolysis of TFOG while increasing the activity of lipase enzyme and also its use as an auxiliary substrate can enhance digestion performance and make digestion more stable.Reza Barati RashvanlouMahdi FarzadkiaAbbas Ali MoserzadehTehran University of Medical Sciencesarticlemunicipal wastewaterfatoil and greaselipase enzymeultrasonic and anaerobic digesterEnvironmental sciencesGE1-350FAسلامت و محیط, Vol 14, Iss 1, Pp 115-128 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	municipal wastewater fat oil and grease lipase enzyme ultrasonic and anaerobic digester Environmental sciences GE1-350
spellingShingle	municipal wastewater fat oil and grease lipase enzyme ultrasonic and anaerobic digester Environmental sciences GE1-350 Reza Barati Rashvanlou Mahdi Farzadkia Abbas Ali Moserzadeh Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion
description	Background and Objective: Hydrolysis of fat, oil and grease by ultrasonic waves is a pre-treatment method before anaerobic digestion which can change their physical, chemical and biological properties. The main purpose of this study was to investigate the efficiency of ultrasonic waves to improve the hydrolysis process and its use as an auxiliary substrate to increase the efficiency of anaerobic digestion process along with municipal sewage sludge. Materials and Methods: Sampling of fat and oil of the degreasing unit and physical preparation by conducting ultrasonic waves with frequencies of 20 kHz and current density of 0.012-0.14 W/mL within 0-12 min were performed. The efficiency of pretreatment process were performed through tests such as soluble chemical oxygen demand (SCOD), and lipase enzyme activity. In addition, the anaerobic digestion process were evaluated by measuring the TS, VS, VA (volatile acidity), alkalinity, biogas production and biogas methane content. Results: The results showed that the highest increase in the activity of lipase enzyme under ultrasonic effect with a power of 0.1 w/mL was obtained after 8 minutes. Organic loading with 10%, 20% and 40% FOG/MSS ratios: resulted in 55%, 66% and 64% increase in methane production compared to the control samples, respectively. Organic loading over the 40% FOG/MSS caused a limitation in the simultaneous digestion process. Conclusion: The results show that ultrasonic wave pretreatment with optimal power and time can improve the hydrolysis of TFOG while increasing the activity of lipase enzyme and also its use as an auxiliary substrate can enhance digestion performance and make digestion more stable.
format	article
author	Reza Barati Rashvanlou Mahdi Farzadkia Abbas Ali Moserzadeh
author_facet	Reza Barati Rashvanlou Mahdi Farzadkia Abbas Ali Moserzadeh
author_sort	Reza Barati Rashvanlou
title	Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion
title_short	Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion
title_full	Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion
title_fullStr	Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion
title_full_unstemmed	Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion
title_sort	evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion
publisher	Tehran University of Medical Sciences
publishDate	2021
url	https://doaj.org/article/158ddd52f6844a00b40ca467973ab807
work_keys_str_mv	AT rezabaratirashvanlou evaluationofpretreatmentefficiencyoffatsoilsandgreasesusinglowfrequencyultrasonicwavestoacceleratetheprocessofanaerobicdigestion AT mahdifarzadkia evaluationofpretreatmentefficiencyoffatsoilsandgreasesusinglowfrequencyultrasonicwavestoacceleratetheprocessofanaerobicdigestion AT abbasalimoserzadeh evaluationofpretreatmentefficiencyoffatsoilsandgreasesusinglowfrequencyultrasonicwavestoacceleratetheprocessofanaerobicdigestion
_version_	1718419348250427392

Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion

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