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Enhancement of sludge anaerobic biodegradability by combined microwave-H2O2 pretreatment in acidic conditions

The aim of this study was to increase the sludge disintegration and reduce the cost of microwave (MW) pretreatment. Thermodynamic analysis of MW hydrolysis revealed the best fit with a first-order kinetic model at a specific energy of 18,600 kJ/kg total solids (TS). Combining H 2 O 2 with MW resulte...

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Published in:Environmental science and pollution research international 2016-07, Vol.23 (13), p.13467-13479
Main Authors: Eswari, Parvathy, Kavitha, S., Kaliappan, S., Yeom, Ick-Tae, Banu, J. Rajesh
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description The aim of this study was to increase the sludge disintegration and reduce the cost of microwave (MW) pretreatment. Thermodynamic analysis of MW hydrolysis revealed the best fit with a first-order kinetic model at a specific energy of 18,600 kJ/kg total solids (TS). Combining H 2 O 2 with MW resulted in a significant increment in solubilization from 30 to 50 % at 18,600 kJ/kg TS. The pH of H 2 O 2 -assisted MW-pretreated sludge (MW + H 2 O 2 ) was in the alkaline range (pH 9–10), and it made the sludge unfavorable for subsequent anaerobic digestion and inhibits methane production. In order to nullify the alkaline effect caused by the MW + H 2 O 2 combination, the addition of acid was considered for pH adjustment. H 2 O 2 -assisted MW-pretreated sludge in acidic conditions (MW + H 2 O 2 + acid) showed a maximum methane production of 323 mL/g volatile solids (VS) than others during anaerobic biodegradability. A cost analysis of this study reveals that MW + H 2 O 2 + acid was the most economical method with a net profit of 59.90 €/t of sludge.
doi_str_mv 10.1007/s11356-016-6543-2
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subjects Acids
Alternative energy sources
Anaerobic digestion
Anaerobiosis
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Biodegradation
Biodegradation, Environmental
Biogas
Chemical oxygen demand
Civil engineering
Cost analysis
Dairy industry
Earth and Environmental Science
Ecotoxicology
Energy consumption
Environment
Environmental Chemistry
Environmental Health
Environmental science
Experiments
Hydrogen peroxide
Hydrogen Peroxide - chemistry
Hydrogen-Ion Concentration
Hydrolysis
Investigations
Methane
Methane - metabolism
Microwaves
Oxidation
Performance evaluation
Research Article
Sewage
Sludge
Sludge digestion
Studies
Volatile solids
Waste Disposal, Fluid - methods
Waste Water Technology
Water Management
Water Pollution Control
title Enhancement of sludge anaerobic biodegradability by combined microwave-H2O2 pretreatment in acidic conditions
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