盐积累胁迫下厌氧正渗透MBR混合液性质的响应特性

Response Characteristics of Anaerobic Forward Osmosis MBR Mixtures to Salt Stressful Accumulation

厌氧正渗透膜生物反应器(AnOMBR)是一种将正渗透膜过程与厌氧生物处理结合的新型污水处理技术,近年来备受关注。然而盐积累是其面临的主要挑战。为此,本研究考察AnOMBR在高盐度的冲击下污泥混合液性质的变化情况。结果表明,反应器运行7 d后,盐积累现象严重,电导率上升到接32 mS/cm,导致初始水通量从14 L/(m^(2)·h)降至3 L/(m^(2)·h)。反应器对TOC和TP的去除效果较好,但氨氮去除效率低于TOC和TP。当反应器内盐浓度胁迫性增长时,混合液中SMP和EPS浓度均有增加,同时EEM荧光谱图中SMP和EPS主要响应峰均为色氨酸和色氨酸/酚物质,EPS响应峰受盐度影响明显强于SMP。

The characteristics of Anaerobic Forward osmosis membrane bioreactor(AnOMBR) mixing fluid under the impact of high salinity are studied. The results show that the initial water flux decreases from 14 L/(m^(2)·h) to 3 L/(m^(2)·h) after 7 days of forward osmosis membrane operation. The removal efficiency of TOC and TP in the reactor was good, but the removal efficiency of ammonia nitrogen was lower than that of TOC and TP. With the increase of salt concentration stress in the reactor, both SMP and EPS were significantly affected. In the EEM fluorescence spectra, the main response peaks of SMP and EPS were basically the same, but the response peak intensity of EPS was significantly stronger than that of SMP. At the same time, SMP and EPS concentrations were significantly increased at 7 d compared with 0 d.