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Variation of dissolved organic matter during excess sludge reduction in microbubble ozonation system
- Source :
- Environmental science and pollution research international. 28(5)
- Publication Year :
- 2020
-
Abstract
- Sewage sludge is the major by-product of wastewater treatment plants, and about 30% readily biodegradable organic matters might be reused through the mass reduction process, which could be also reduced the disposal fee. In this study, the microbubble ozonation (MB-O3) was employed to improve the oxidation efficiency for sludge solubilization. At 160 mgO3/gSS, the maximum mixed liquor suspended solids (MLSS) reduction ratio was 37.5% and the protein and polysaccharide contents increased to 31.6 and 138.6 mg/L, respectively. It was proposed that aromatic protein and soluble microbial in sludge were oxidized preferentially by MB-O3, and the dissolved organic matter (DOM) fractions (mainly humic-acid-like substances) exhibited low degradability according to the variations of fluorescence excitation-emission spectrum coupled with fluorescence regional integration. MB-O3 could enhance the settleability, but deteriorate sludge dewaterability at low dosage (< 160 mgO3/gSS) due to a reduction in particle size from 61.7 to 47.5 μm. MB-O3 has a good performance on the mass reduction of sludge through the improvement of the radical generated.
- Subjects :
- chemistry.chemical_classification
Microbubbles
Sewage
Chemistry
Health, Toxicology and Mutagenesis
General Medicine
010501 environmental sciences
Pulp and paper industry
Polysaccharide
Reduction ratio
01 natural sciences
Pollution
Waste Disposal, Fluid
Mixed liquor suspended solids
Ozone
Solubilization
Dissolved organic carbon
Environmental Chemistry
Sewage treatment
Particle size
Sludge
Humic Substances
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 16147499
- Volume :
- 28
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Environmental science and pollution research international
- Accession number :
- edsair.doi.dedup.....150b9361b031f09b19ee6c3e990a9141