College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China.
River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
Environ Sci Pollut Res Int. 2021 Jan;28(3):2779-2790. doi: 10.1007/s11356-020-10596-4. Epub 2020 Sep 6.
The characteristics of dissolved organic matter (DOM) formed in aerobic and anaerobic digestion of waste-activated sludge (WAS) after ozone pretreatment were investigated with three ozone dosages (4.72, 10.96, and 13.8 mg O/min) and four ozonation times (0, 10, 20, and 30 min) using six aerobic and six anaerobic digestion reactors. High decreasing rate of volatile suspended solid/total suspended solid indicated enhanced destruction of volatile solids and efficient sludge reduction. The results of TOC and UV absorbance indicated that increasing ozone dosage and time significantly enhanced hydrolysis and degradation of DOM. Data analysis with a first-order sequential reaction model revealed that, for aerobic digestion, k increased in the range of 0.00049-0.00154 day; and for anaerobic digestion of WAS, k increased in the range of 0.00302-0.00796 day and k increased in the range of 0.24910-0.54548 day. Detailed analysis of the composition of DOM showed that ozone pretreatment increased irreversible membrane resistance (IMR) and enhanced the breakdown of large DOM molecules, the formation of aromatic proteins, and tryptophan- and tyrosine-aromatic amino acids, as well as the accumulation of humic acid- and fulvic acid-like substances.
研究了经臭氧预处理的好氧和厌氧消化废活性污泥（WAS）中形成的溶解有机物（DOM）的特性。采用六个好氧和六个厌氧消化反应器，用三种臭氧剂量（4.72、10.96 和 13.8 mg O/min）和四种臭氧氧化时间（0、10、20 和 30 min）进行了实验。挥发性悬浮固体/总悬浮固体的高降低率表明挥发性固体的破坏增强和有效的污泥减少。TOC 和 UV 吸光度的结果表明，增加臭氧剂量和时间可显著增强 DOM 的水解和降解。使用一阶顺序反应模型进行数据分析表明，对于好氧消化，k 的范围为 0.00049-0.00154 天；对于 WAS 的厌氧消化，k 的范围为 0.00302-0.00796 天，k 的范围为 0.24910-0.54548 天。对 DOM 组成的详细分析表明，臭氧预处理增加了不可逆膜阻力（IMR），并增强了大 DOM 分子的分解、芳香蛋白质和色氨酸和酪氨酸芳香族氨基酸的形成，以及腐殖酸和富里酸类物质的积累。
