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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Barati Rashvanlou Reza; FARZADKIA MAHDI; Moserzadeh Abbas Ali

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF HEALTH AND ENVIRONMENT Year:2021 | Volume:14 | Issue:1 Page(s): 115-128

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Information Journal Paper

Title

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

Author(s)

Barati Rashvanlou Reza | FARZADKIA MAHDI | Moserzadeh Abbas Ali | Issue Writer Certificate

Keywords

Municipal wastewaterQ1

FatQ1

Oil and greaseQ1

Lipase enzymeQ1

Ultrasonic and anaerobic digesterQ1

Abstract

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.

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APA: Copy

Barati Rashvanlou, Reza, FARZADKIA, MAHDI, & Moserzadeh, Abbas Ali. (2021). Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion. IRANIAN JOURNAL OF HEALTH AND ENVIRONMENT, 14(1 ), 115-128. SID. https://sid.ir/paper/409811/en

Vancouver: Copy

Barati Rashvanlou Reza, FARZADKIA MAHDI, Moserzadeh Abbas Ali. Evaluation of pre-treatment efficiency of fats, oils and greases using low frequency ultrasonic waves to accelerate the process of anaerobic digestion. IRANIAN JOURNAL OF HEALTH AND ENVIRONMENT[Internet]. 2021;14(1 ):115-128. Available from: https://sid.ir/paper/409811/en

IEEE: Copy

Reza Barati Rashvanlou, MAHDI FARZADKIA, and 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,” IRANIAN JOURNAL OF HEALTH AND ENVIRONMENT, vol. 14, no. 1 , pp. 115–128, 2021, [Online]. Available: https://sid.ir/paper/409811/en

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