Disintegration as a key-step in pre-treatment of surplus activated sludge

This study has been carried out to investigate the effect of microwave, alkalization and freezing on surplus activated sludge disintegration (release of organic/inorganic substances into the supernatant) and mesophilic fermentation. After applying pre-treatments, chemical oxygen demand increased by...

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Bibliographic Details
Published in:Journal of water chemistry and technology 2017, Vol.39 (1), p.47-55
Main Authors: Machnicka, A., Nowicka, E., Grübel, K.
Format: Article
Language:English
Subjects:
Activated sludge
Ammonium
Anaerobic digestion
Aquatic Pollution
Biogas
Biological Methods of Water Treatment
Carbohydrates
Chemical oxygen demand
Earth and Environmental Science
Environment
Fermentation
Freezing
Industrial Chemistry/Chemical Engineering
Microwave radiation
Microwaves
Sewage sludge
Sludge
Sludge digestion
Studies
Waste Water Technology
Water Industry/Water Technologies
Water Management
Water Pollution Control
Water Quality/Water Pollution
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Summary:This study has been carried out to investigate the effect of microwave, alkalization and freezing on surplus activated sludge disintegration (release of organic/inorganic substances into the supernatant) and mesophilic fermentation. After applying pre-treatments, chemical oxygen demand increased by 7–35 times, disintegration degree was 35–47%, proteins by 5–25, carbohydrates by 2–3, phosphates 7–22 and ammonium by 3–16 times. Disintegration by microwave, alkalization and freezing has a positive effect on the rate of sludge anaerobic digestion. Biogas production increased by: 62; 49 and 58%, for microwave radiation, alkalization and freezing, respectively. The conducted research shows that the application of disintegration as a pre-treatment of surplus activated sludge is an effective method, allowing for practical using sewage sludge.
ISSN:1063-455X
1934-936X
DOI:10.3103/S1063455X17010088