Pathak, Santosh

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Engineering Conferences International

Engineering Conferences InternationalECI Digital ArchivesWastewater and Biosolids Treatment and Reuse:Bridging Modeling and Experimental Studies ProceedingsSpring 6-10-2014Comparative study of the mechanisms ofultrasonic, alkaline, and sono-alkaline pretreatmentof industrial biosludgeSantosh PathakNanyang Technological University, SingaporeFollow this and additional works at: http://dc.engconfintl.org/wbtr_iPart of the Environmental Engineering CommonsThis Conference Proceeding is brought to you for free and open access by the Proceedings at ECI Digital Archives. It has been accepted for inclusion inWastewater and Biosolids Treatment and Reuse: Bridging Modeling and Experimental Studies by an authorized administrator of ECI Digital Archives.For more information, please contact franco@bepress.com.Recommended CitationSantosh Pathak, "Comparative study of the mechanisms of ultrasonic, alkaline, and sono-alkaline pretreatment of industrial biosludge"in "Wastewater and Biosolids Treatment and Reuse: Bridging Modeling and Experimental Studies", Dr. Domenico Santoro, TrojanTechnologies and Western University Eds, ECI Symposium Series, (2014). http://dc.engconfintl.org/wbtr_i/11Comparative Study of Ultrasonic, Alkaline, and Sono-Alkaline Pre-treatment on Industrial Secondary Biosludge Santosh Pathak   Advanced Environmental Biotechnology Center Wastewater and Biosolids Treatment and Use Otranto, Italy Introduction Anaerobic digestion AD of biosludge Pretreatment methods   Biosludge solidification   Energy recovery   Low biodegradability    Slow digestion process  Biological, Chemical, Biochemical, Thermal, Physical http://greenislands.se/2012/06/sludge-seminar-in-helsingborg   Feed Biomass   Generated from aerobic industrial wastewater treatment process   Low SCOD/TCOD   High VS/TS   Low Biogas generation during BMP test  Ultrasonication Ultrasonication Alkaline pretreatment Alkaline pretreatment Sludge floc disintegration Rupture cell walls Degrade Intracellular Macromolecule Degrade Extracellular Macromolecule Fermentation Acidogenesis Methanogenesis   Hypothesis Particle size Biomass Stress Index SEC fingerprint, EPS, SCOD Methane generation Sludge floc disintegration Rupture cell walls Degrade Intracellular Macromolecule Degrade Extracellular Macromolecule Fermentation Acidogenesis Methanogenesis Methodology   Process flow Ultrasonic Pretreatment Alkaline pretreatment BMP test Alkali Dosage NaOH/TS Ultrasonication Specific Energy Input 0 KJ/gVS 3 KJ/gVS 6 KJ/gVS 0 g/g 0.1 g/g 0.3 g/g • Pretreatment time 24hrs • Total Volume: 0.12L • Working Volume: 0.08 L • F/M: 1.5 gTCOD/gVSS   Experimental design 1.21 3.68 5.18 0.89 3.87 5.35 1.17 4.34 5.61 0.00 1.00 2.00 3.00 4.00 5.00 6.00 0 gNaOH/g-VS 0.1 gNaOH/g-VS 0.3 gNaOH/g-VS SCOD concentration, g/L Alkaline dosage: SCOD concentration of feed biomass samples after ultrasonic, alkaline, and sono-alkaline pretreatment 0 KJ/g-VS 3 KJ/g-VS 6 KJ/g-VS   SCOD release Results 5.4 58.3 96.8 6.0 50.6 99.2 5.9 59.4 98.1 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 0 gNaOH/g-VS 0.1 gNaOH/g-VS 0.3 gNaOH/g-VS Biomass Stress Index, % Dosage of alkali Biomass stress index of microbes in sludge sample after ultrasonic, alkaline, and sono-alkaline pretreatment 0 KJ/g-VS 3 KJ/g-VS 6 KJ/g-VS   Biomass stress index (BSI) UV280nm detector signals of sludge samples after ultrasonic, alkaline, and sono-alkaline pretreatment   SEC fingerprint 0.0 200.0 400.0 600.0 800.0 1000.0 1200.0 1400.0 1600.0 1800.0 0 5 10 15 20 25 30 CH4 production per unit of sample, mL/L Day Cumulative methane generation from BMP test after ultrasonic, alkaline, and sono-alkaline pretreatment NaOH:0.3,Sonic:6 NaOH:0.3,Sonic:3 NaOH:0.3,Sonic:0 NaOH:0.1,Sonic:6 NaOH:0.1,Sonic:3 NaOH:0.1,Sonic:0 NaOH:0,Sonic:6 NaOH:0,Sonic:3 NaOH:0,Sonic:0 Blank   Methane generation Discussion Conclusions   Alkaline pretreatment could promote the COD and EPS solubilisation, rupture of microbial cells, decompose biomacromolecules, and enhance methane generation. However, it is not efficient to disintegrate large sludge particles   Ultrasonic pretreatment could disintegrate large sludge particles, but has less contribution to stimulate COD and EPS solubilisation, rupture of microbial cells, or decomposition of biomacromolecules. Consequently, it hardly enhances methane generation   Sono-alkaline pretreatment shows similar treatment effect as alkaline treatment with better performance in particles disintegration   The key to enhance methane generation shall be solubilisation of SCOD and EPS, rupture of microbial cells, and decomposition of biomacromolecules. 13 Acknowledgement   Funding agency: Energy Market Authority Singapore through Smart Energy Challenge research funding   Industrial partner: Sembcorp Industries Ltd.   Team members Thank You The Flow of Hope THE POWER OF WATER 

Comparative study of the mechanisms of ultrasonic, alkaline, and sono-alkaline pretreatment of industrial biosludge

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Comparative study of the mechanisms of ultrasonic, alkaline, and sono-alkaline pretreatment of industrial biosludge

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