Meng Xianrong, Liu Dongfang, Frigon Matthew
College of Environmental Science and Engineering/Tianjin Key Laboratory of Environmental Remediation and Pollution Control/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Wei Jin Road 94, Tianjin 300071, China E-mail:
Water Sci Technol. 2015;71(7):1026-32. doi: 10.2166/wst.2015.066.
The purpose of this research is to investigate the activated sludge ozonation process. Results revealed that bacteria destruction and cell solubilization were not obvious when ozone dose was lower than 11 mgO₃/gMLSS (MLSS: mixed liquor suspended solids), while pores appeared on the sludge and bacterial disappeared from floc surface. In the range of 11-90 mgO₃/gMLSS, ozone had significant effect on cell permeabilization and disruption. Meanwhile, a large quantity of macromolecules and nutrients were released from bacteria cells. Additionally, efficiency of ozone utilization was low but specific solubilization related to cell lysis was high at this level. Greater than 90 mgO₃/gMLSS, the number of live cells and dead cells were both stable, and the quantity of material in bulk liquid increased slowly. The specific solubilization ratio decreased while the efficiency of ozone utilization began to increase. This indicated that ozone oxidized the macromolecules in the bulk liquid instead of bacteria cells at high ozone dose.
本研究的目的是调查活性污泥臭氧化过程。结果表明，当臭氧剂量低于11mgO₃/gMLSS（MLSS：混合液悬浮固体）时，细菌破坏和细胞溶解并不明显，而污泥上出现孔隙，絮体表面的细菌消失。在11 - 90mgO₃/gMLSS范围内，臭氧对细胞通透化和破坏有显著影响。同时，大量大分子和营养物质从细菌细胞中释放出来。此外，在此水平下臭氧利用效率较低，但与细胞裂解相关的比溶解率较高。大于90mgO₃/gMLSS时，活细胞和死细胞数量均稳定，主体液体中的物质数量缓慢增加。比溶解率下降，而臭氧利用效率开始上升。这表明在高臭氧剂量下，臭氧氧化的是主体液体中的大分子而非细菌细胞。
