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JDS International Seminar
Effects of Nano-Bubble Water on Biogas Production from Anaerobic Digestion of Lignin Student name: Ho Thi Hang Supervisor: Zhang Zhenya Lei Zhongfang Tsukuba, January 2018
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Contents Background Objective Methodology Results Conclusions
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Environmental pollution from burning lignocellulosic wastes
Background Objective Methodology Results Conclusions Environmental pollution from burning lignocellulosic wastes Viet Nam is a country has abundant lignocellulose wastes (about 76 million tons of crop straws per year) Global warming
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Anaerobic digestion (AD) technology
Background Objective Methodology Results Conclusions Anaerobic digestion (AD) technology
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Difficulty in AD of lignocellulosic wastes
Background Objective Methodology Results Conclusions Difficulty in AD of lignocellulosic wastes Lignin is one of the major barriers to degradation of lignocellulosic materials (Mussatto et al., 2008)
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Methods used for the enhancement of AD of lignocellulosic wastes
Background Objective Methodology Results Conclusions Methods used for the enhancement of AD of lignocellulosic wastes Kinds of pretreatment before anaerobic digestion: Physical pretreatment Chemical pretreatment Biological pretreatment
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Background Objective Methodology Results Conclusions Nano-bubbles Miniature gas bubbles in liquid with <200 nm in diameter Remain stable in water for a long time Generate highly reactive free radicals Schematic diagram showing macro, micro and nanobubbles (Takahashiet al., 2007b)
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Nano-bubbles application
Background Objective Methodology Results Conclusions Nano-bubbles application Nano-bubble water can enhance organics degradation (Ashutosh et al., 2011)
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Objective of this study
Background Objective Methodology Results Conclusions Objective of this study To investigate the effect of nanobubbles in AD of lignin
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Background Objective Methodology Results Conclusions Anarobic digester
Biogas Anarobic digester Digested sludge Nanobubble water Lignin Acetic acid
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Experimental design DW CO2 N2 Background Objective Methodology Results
Conclusions Experimental design DW CO2 N2 Inoculum + DW Medium Inoculum + CO2-NBW Medium Inoculum + N2-NBW Medium Inoculum:Digested Sludge; Medium: 90% acetic acid + 10% lignin (based on TOC) DW: deionized water NBW: nanobubble water TOC: total organic carbon
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Composition of the medium Nutrients/mineral/buffer
Concentration (mg/l) TOC (lignin, acetic acid) 2000 EDTA 789 KH2PO4 220 Na2HPO4 860 H3BO4 40 ZnCl2 320 CuCl2 6.3 MnCl24H2O 45.5 CoCl26H2O 54.72 NiCl26H2O 11.409 NaCl 300 MgSO47H2O 121.24 CaCl2.H2O 110 NH4Cl L-Cysteine 103.55 Yeast-extract 500 NaHCO3 4000 FeSO47H2O 98.511 Composition of the medium
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Cumulative biogas production (ml/g-TOCremoval)
Background Objective Methodology Results Conclusions Cumulative biogas production (ml/g-TOCremoval) Nanobubble water addition=> Enhanced biogas production N2-NBW reactor exhibited the highest biogas production
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Cumulative methane production
Background Objective Methodology Results Conclusions Cumulative methane production NBW added reactors produced much higher amount of methane
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Volatile Fatty Acids Concentration
Background Objective Methodology Results Conclusions Volatile Fatty Acids Concentration Almost VFAs are converted into biogas Lignin might be degraded to produce VFAs
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Total Organic Carbon Removal
Background Objective Methodology Results Conclusions Total Organic Carbon Removal TOC removal: 40-50% in all reactors
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Background Objective Methodology Results Conclusions Lignin degradation nanobubble water addition => enhanced lignin degradation N2-NBW reactor achieved a little bit higher lignin degradation
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Addition of NBW has some positive effects on AD of lignin
Background Objective Methodology Results Conclusions Addition of NBW has some positive effects on AD of lignin Enhanced methane production Higher lignin removal Addition of N2-NBW showed a little bit higher biogasification from lignin than CO2-NBW The mechanisms involved need further investigation
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