Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan, 430065, China.
Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan, 430065, China.
J Environ Manage. 2021 Mar 15;282:111955. doi: 10.1016/j.jenvman.2021.111955. Epub 2021 Jan 13.
This paper investigated the performance of non-aerated microalgal-bacterial granular sludge (MBGS) process in municipal wastewater treatment at different temperatures. Results showed that the 70.5%, 81.9% and 86.1% of chemical oxygen demand (COD) could be removed at 15, 22 and 30 °C, respectively, indicating that a high temperature favored removal of organics due to promoted biomass growth. It was found that most of ammonia-N was removed via microbial assimilation by microalgae and bacteria in granules, with bacterial assimilation being dominant at the lower temperature. The phosphorus removal efficiency of 90.1% was achieved at 22 °C, with the presence of abundant Leptolyngbyales, a potential phosphorus accumulating alga. Chlorophyta grew much faster than Leptolyngbyales at 30 °C in microalgal-bacterial granules. It can be concluded that the contributions of microalgal and bacterial assimilations toward COD, ammonia and P removal appeared to be temperature-dependent, i.e. temperature could alter the symbiotic relationship between microalgae and bacteria. This study would contribute to the application of non-aerated MBGS process in municipal wastewater treatment with seasonal variation of temperature.
本研究考察了不同温度条件下非曝气式微藻-细菌颗粒污泥（MBGS）工艺处理城市污水的效能。结果表明，在 15、22 和 30℃下，COD 的去除率分别达到了 70.5%、81.9%和 86.1%，表明高温有利于有机物的去除，这是由于促进了生物量的生长。研究发现，大部分氨氮是通过微藻和细菌在颗粒中的微生物同化作用去除的，在较低温度下，细菌同化作用占主导地位。在 22℃时，磷的去除效率达到了 90.1%，此时存在丰富的潜在聚磷藻--颤藻。在 30℃时，绿藻在微藻-细菌颗粒中的生长速度明显快于颤藻。可以得出结论，微藻和细菌同化作用对 COD、氨氮和磷去除的贡献似乎是温度依赖性的，即温度可以改变微藻和细菌之间的共生关系。本研究将有助于非曝气式 MBGS 工艺在具有季节性温度变化的城市污水处理中的应用。
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