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Effect of lysozyme combined with hydrothermal pretreatment on excess sludge and anaerobic digestion
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Effect of lysozyme combined with hydrothermal pretreatment on excess sludge and anaerobic digestion
Anaerobic digestion(AD)is widely employed for sludge stabilization and waste reduction.However,the slow hydrolysis process hinders methane production and leads to prolonged sludge issues.In this study,an efficient and eco-friendly lysozyme pre-treatment method was utilized to address these challenges.By optimizing lysozyme dosage,hydrolysis and cell lysis were maximized.Furthermore,lysozyme combined with hydrothermal pretreat-ment enhanced overall efficiency.Results indicate that:(1)When lysozyme dosage reached 90 mg/g TS after 240 min of pretreatment,SCOD,soluble polysaccharides,and protein con-tent reached their maxima at 855.00,44.09,and 204.86 mg/L,respectively.This represented an increase of 85.87％,365.58％,and 259.21％compared to the untreated sludge.Three-dimensional fluorescence spectroscopy revealed the highest fluorescence intensity in theⅣ region(soluble microbial product),promoting microbial metabolic activity.(2)Lysozyme combined with hydrothermal pretreatment significantly increased SCOD,soluble proteins,and polysaccharide release from sludge,reducing SCOD release time.Orthogonal experi-ments identified Group 3 as the most effective for SCOD and soluble polysaccharide re-lease,while Group 9 released the most soluble proteins.The significance order of factors influencing SCOD,soluble proteins,and polysaccharide release is hydrothermal tempera-ture＞hydrothermal time＞enzymatic digestion time.(3)The lysozyme-assisted hydrother-mal pretreatment group exhibited the fastest release and the highest SCOD concentration of 8,135.00 mg/L during anaerobic digestion.Maximum SCOD consumption and cumula-tive gas production increased by 95.89％and 130.58％,respectively,compared to the control group,allowing gas production to conclude 3 days earlier.
Excess sludgeLysozymeHydrothermal pre-treatmentAnaerobic digestionGas production
Xiuqin Cao、Songyue Li、Chaolei Liu
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School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China
Key Laboratory of Urban Storm water System and Water Environment(Ministry of Education),Beijing University of Civil Engineering and Architecture,Beijing 100044,China
Excess sludge Lysozyme Hydrothermal pre-treatment Anaerobic digestion Gas production
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