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.

中文翻译：

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微泡臭氧化系统中过量污泥减少过程中溶解有机物的变化。

污水污泥是废水处理厂的主要副产品，通过减量化过程可以再利用约30％的易于生物降解的有机物，这也可以减少处置费用。在这项研究中，微泡臭氧化（MB-O3）用于提高污泥溶解的氧化效率。在160 mgO3 / gSS下，最大混合液悬浮固体（MLSS）减少率为37.5％，蛋白质和多糖含量分别增加到31.6和138.6 mg / L。提出污泥中的芳香蛋白和可溶性微生物被MB-O3优先氧化，溶解态有机物（主要是腐殖酸样物质）的分解表现出低的可降解性，这是由于荧光激发-发射光谱与荧光区域积分相结合而引起的。MB-O3可以提高沉降性，但由于粒径从61.7μm减小到47.5μm，因此在低剂量（<160 mgO3 / gSS）下污泥的脱水性降低。MB-O3通过改善所产生的自由基，在减少污泥的质量方面具有良好的性能。