To understand the mechanism of enhanced nitrogen removal by photo-sequencing batch reactors (photo-SBRs), which incorporated microalgal photosynthetic oxygenation into the aerobic phases of a conventional cycle, this study performed comprehensive analysis of one-cycle dynamics. Under a low aeration intensity (about 0.02 vvm), a photo-SBR, illuminated with light at 92.27 μ·mol·m⁻²·s⁻¹, could remove 99.45% COD, 99.93% NH₄⁺-N, 90.39% TN, and 95.17% TP, while the control SBR could only remove 98.36% COD, 83.51% NH₄⁺-N, 78.96% TN, and 97.75% TP, for a synthetic domestic sewage. The specific oxygen production rate (SOPR) of microalgae in the photo-SBR could reach 6.63 fmol O₂·cell⁻¹·h⁻¹. One-cycle dynamics shows that the enhanced nitrogen removal by photo-SBRs is related to photosynthetic oxygenation, resulting in strengthened nitrification, instead of direct nutrient uptake by microalgae. A too high light or aeration intensity could deteriorate anoxic conditions and thus adversely affect the removal of TN and TP in photo-SBRs.

为了了解通过光测序间歇反应器（photo-SBRs）去除氮的机制，该反应器将微藻类的光合作用氧合到了常规循环的好氧相中，这项研究对一循环动力学进行了综合分析。在低曝气强度（约0.02 vvm）下，用92.27μ·mol·m ^-2 ·s ^-1的光照射的光SBR可以去除99.45％的COD，99.93％的NH ₄ ⁺ -N，90.39％的TN对于合成生活污水，对照SBR只能去除98.36％的COD，83.51％的NH ₄ ⁺ -N，78.96％的TN和97.75％的TP。光SBR中微藻的比氧产生率（SOPR）可以达到6.63 fmol O ₂ ·cell^-1 ·h ^-1。一周期动力学表明，光SBR去除氮的增加与光合氧化有关，导致硝化作用增强，而不是微藻直接吸收养分。太高的光强度或曝气强度可能会使缺氧条件恶化，从而对光SBR中TN和TP的去除产生不利影响。