Improving biogas production performance of dairy activated sludge via ultrasound disruption prior to microwave disintegration | Zendy

Mahmood Al Ramahi | Zendy; Gábor KeszthelyiSzabó | Zendy; Sándor Beszédes | Zendy

Open Access

Improving biogas production performance of dairy activated sludge via ultrasound disruption prior to microwave disintegration

Author(s) -

Mahmood Al Ramahi,

Gábor KeszthelyiSzabó,

Sándor Beszédes

Publication year - 2020

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.216

Subject(s) - biogas , biogas production , microwave , lysis , ultrasound , activated sludge , pulp and paper industry , waste management , ultrasound energy , materials science , environmental science , chemistry , anaerobic digestion , environmental engineering , sewage treatment , medicine , methane , biochemistry , physics , organic chemistry , quantum mechanics , engineering , radiology

In this study, ultrasound disruption was employed to enhance the efficiency of microwave disintegration of dairy sludge. Results revealed that ultrasound specific energy input of 1,500 kJ/kg TS was found to be optimum with limited cell lysis at the end of the disruption phase. Biodegradability study suggested an enhancement in suspended solids reduction (16%) and biogas production (180 mL/gVS) in floc disrupted (deflocculated) samples when compared to sole microwave pretreatment (8.3% and 140 mL/gVS, respectively). Energy assessment to attain the 15% optimum solubilization revealed a positive net production of 26 kWh per kg sludge in deflocculated samples compared to 18 kWh in flocculated (sole microwave) samples. Thus, ultrasound disruption prior to microwave disintegration of dairy sludge was considered to be a feasible pretreatment technique.

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