Ultrasonic pretreatment and subsequent anaerobic digestion under different operational conditions

Bioresource Technology
Onur Güven Apul, F Dilek Sanin

Abstract

In this study ultrasonic pretreatment was investigated in order to improve anaerobic digestion. First, the most effective sonication time was selected during the preliminary studies conducted on waste activated sludge samples. Then the optimal time selected was confirmed running batch anaerobic reactors. In the last part of the experiments, the effect of sonication was investigated for different operational conditions of semi-continuous digesters. Preliminary studies showed 15 min of sonication increased 50 mg/L initial soluble COD concentration up to a value of 2500 mg/L. Batch anaerobic digester results indicated that the increased soluble substrate improved anaerobic biodegradability concurrently, again with the maximal improvement observed for 15 min of sonication. Results from semi-continuous reactors indicated that at SRT of 15 days and OLR of 0.5 kg/m(3) d, ultrasonic pretreatment improved the daily biogas production, methane production and volatile solids reduction significantly when compared to control system. During the operation of reactors at 7.5 days of SRT, pretreatment helped to keep the reactors working. A simple economical analysis of the system was performed using the data obtained during the laboratory study.

Citations

Jun 2, 2014·Ultrasonics Sonochemistry·Nilgun Ayman Oz, Alev Cagla Uzun
May 29, 2012·Waste Management·My CarlssonFernando Morgan-Sagastume
Jun 7, 2011·Bioresource Technology·C M BragugliaG Mininni
Jan 19, 2015·Ultrasonics Sonochemistry·Martin PetkovšekMatevž Dular
May 18, 2020·Environmental Science and Pollution Research International·Afamia I KouziMerja H Kontro
Mar 12, 2020·Environmental Science and Pollution Research International·Emrehan Berkay ÇelebiF Dilek Sanin
Jul 21, 2021·Biotechnology for Biofuels·Kehinde Oladoke OlatunjiOyetola Ogunkunle

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