Variation of dissolved organic matter during excess sludge reduction in microbubble ozonation system
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RESEARCH ARTICLE
Variation of dissolved organic matter during excess sludge reduction in microbubble ozonation system Zhiyi Sun 1 & Yuxiang Wang 1 & Xiaoliang Chen 2 & Nanwen Zhu 1,3 & Haiping Yuan 1 & Ziyang Lou 1,3,4 Received: 29 April 2020 / Accepted: 9 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 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. Keywords Microbubble ozonation . Sludge solubilization . Dissolved organic matter . EEM-FIR spectrum . Partial size distribution
Introduction Highlights • The maximum MLSS reduction ratio reached to 37.5% by MB-O3. • The Pi,n of aromatic protein and soluble microbial decreased to 1.27% and 25% by EEM-FIR. • MB-O3 promoted sludge sedimentation due to a reduction in particle size from 61.7 to 47.5 μm. Responsible Editor: Philippe Garrigues Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10799-9) contains supplementary material, which is available to authorized users. * Ziyang Lou [email protected] 1
Shanghai Engineering Research Center of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Shanghai Solid Waste Management Center, Shanghai 200235, China
3
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
4
China Institute for Urban Governance, Shanghai Jiao Tong University, Shanghai 200240, China
The production of waste activated sludge (WAS) is continuously increasing in wastewater treatment, and its ultimate disposal still remains as a bottleneck for treatment plants (Guo et al. 2020; Krueger et al. 2020; Qiang et al. 2015). More stringent regulations regarding sludge treatment have given impetus to develop the reduction of excess solids. Ozone has been reported to decompose and mineralize the organic matter in wastewater and was applied to reduce the WAS in th
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