An evaluation of lysozyme enzyme and thermal pretreatments on dairy sludge digestion and gas production | Zendy

Shakiba Jafari | Zendy; Moslem Salehiziri | Zendy; Elham Foroozesh | Zendy; Mohammad Javad Bardi | Zendy; Hasan Amini Rad | Zendy

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An evaluation of lysozyme enzyme and thermal pretreatments on dairy sludge digestion and gas production

Author(s) -

Shakiba Jafari,

Moslem Salehiziri,

Elham Foroozesh,

Mohammad Javad Bardi,

Hasan Amini Rad

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.2020.198

Subject(s) - anaerobic digestion , chemistry , volatile suspended solids , chemical oxygen demand , biogas , lysozyme , hydrolysis , activated sludge , pulp and paper industry , biogas production , thermal hydrolysis , total dissolved solids , suspended solids , mixed liquor suspended solids , anaerobic exercise , digestion (alchemy) , food science , waste management , chromatography , sewage treatment , biochemistry , wastewater , environmental science , environmental engineering , sewage sludge treatment , methane , biology , organic chemistry , physiology , engineering

Anaerobic digestion is one of the common methods of managing and stabilizing sludge. However, due to the limitations of the biological sludge hydrolysis stage, anaerobic decomposition is slow and requires a long time. This study evaluated the effects of thermal (80 °C) (TH-PRE) and a combination of thermal with the lysozyme enzyme (LTH-PRE) pretreatments on the enhancement of anaerobic activated sludge digestion. Response surface methodology was implemented to optimize enzyme pretreatment conditions (enzyme and mixed liquid suspended solids concentration). The results showed that both pretreatment methods increase soluble chemical oxygen demand (COD) and reduces total and volatile suspended solids (VSS), and phosphate concentration. The COD removal rate in LTH-PRE and TH-PRE was 95% and 81%, respectively. The value of VSS reduction in LTH-PRE and TH-PRE was 41% and 31%, more than the control operation, respectively. The biogas production in LTH-PRE and in TH-PRE also increased by 124% and 96%, respectively.

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