State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China; UNEP-Tongji Institute of Environment for Sustainable Development, Shanghai 200092, People's Republic of China.
Bioresour Technol. 2015 Feb;177:209-16. doi: 10.1016/j.biortech.2014.11.093. Epub 2014 Nov 27.
To better understand the effect of influent nitrogen concentration on granule size and microbial community in a granule-based enhanced biological phosphorus removal system, three influent nitrogen concentrations were tested while carbon concentration was an unlimited factor. The results show that although ammonium and phosphate were well removed in the tested nitrogen concentration range (20-50 mg L(-1)), granule size, the amount of phosphate accumulating organisms (PAOs) and microbial activity were affected significantly. A possible mechanism for the effect of influent nitrogen concentration on granule size is proposed based on the experimental results. The increase in proteins/polysaccharides ratio caused by high influent nitrogen concentration plays a crucial role in granule breakage. The small granule size then weakens simultaneous nitrification-denitrification, which further causes higher nitrate concentration in the effluent and lower amount of PAOs in sludge. Consequently, phosphate concentration in the anaerobic phase decreases, which plays the secondary role in granule breakage.
为了更好地理解进水氮浓度对颗粒状强化生物除磷系统中颗粒大小和微生物群落的影响，在测试了三种进水氮浓度，而碳浓度是一个无限制因素。结果表明，尽管在测试的氮浓度范围内（20-50mg/L）能够很好地去除氨氮和磷酸盐，但颗粒大小、聚磷菌（PAOs）的数量和微生物活性受到了显著影响。根据实验结果，提出了进水氮浓度对颗粒大小影响的可能机制。高进水氮浓度引起的蛋白质/多糖比例增加在颗粒破裂中起着关键作用。较小的颗粒尺寸随后削弱了同步硝化反硝化作用，这进一步导致出水中的硝酸盐浓度更高，污泥中的 PAOs 数量更低。因此，厌氧阶段的磷酸盐浓度降低，这在颗粒破裂中起着次要作用。
