A novel Phototrophic - Enhanced Biological Phosphorus Removal (Photo-EBPR) system, consisting of a consortium of photosynthetic organisms and polyphosphate accumulating organisms (PAOs), was studied in this work. A sequencing batch reactor was fed with a mixture of acetate and propionate (75%–25%) and subjected to dark/light cycles in order to select a photo-EBPR system containing PAOs and photosynthetic organisms, the latter likely providers of oxygen to the system. The results from the selection period (stage 1) showed that the photo-EBPR culture was capable of performing P release in the dark and P uptake in the presence of light, under limited oxygen concentrations. During the optimization period, the aeration period, which was initially provided at the end of the light phase, was gradually reduced until a non-aerated system was achieved, while the light intensity was increased. After optimization of the operational conditions, the selected consortium of photosynthetic organisms/PAOs showed high capacity of P removal in the light phase in the absence of air or other electron acceptor. A net P removal of 34 ± 3 mg-P/L was achieved, with a volumetric P removal rate of 15 ± 2 mg-P/L.h, and 79 ± 8% of P removal from the system. Also, in limiting oxygen conditions, the P uptake rate was independent of the PHA consumption, which demonstrates that the organisms obtained energy for P removal from light. These results indicated that a photo-EBPR system can be a potential solution for P removal with low COD/P ratios and in the absence of air, prospecting the use of natural sunlight as illumination, which would reduce the costs of EBPR operation regarding aeration.

中文翻译：

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操作策略对光EBPR系统性能的影响

在这项工作中，研究了一种新型的光养-增强生物除磷（Photo-EBPR）系统，该系统由光合生物和聚磷酸盐累积生物（PAO）组成。向顺序批反应器中加入乙酸和丙酸酯（75％–25％）的混合物，并进行暗/亮循环，以选择包含PAO和光合生物的光EBPR系统，后者可能是向系统。选择期（阶段1）的结果表明，光EBPR培养物能够在有限的氧气浓度下在黑暗中释放P和在有光的情况下吸收P。在优化期间，逐渐减少了最初在光照阶段结束时提供的曝气时间，直到实现了非曝气系统，同时增加了光强度。在优化操作条件后，所选的光合生物/ PAO财团在不存在空气或其他电子受体的情况下，在轻相中表现出较高的P去除能力。净磷去除率为34±3 mg-P / L，体积磷去除率为15±2 mg-P / Lh，系统磷去除率为79±8％。同样，在有限的氧气条件下，磷的吸收速率与PHA的消耗量无关，这表明生物体获得了从光中去除P的能量。这些结果表明，光EBPR系统可以作为低COD / P比且在没有空气的情况下去除P的潜在解决方案，从而有望使用自然阳光作为照明，这将降低EBPR在曝气方面的运行成本。