Du Shi-Ming, Yu De-Shuang, Bi Chun-Xue, Wang Xiao-Xia, Chen Guang-Hui, Yuan Meng-Fei, Zhen Jian-Yuan, Zhang Fan, Lü Ting-Ting
School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
Huan Jing Ke Xue. 2019 Feb 8;40(2):791-798. doi: 10.13227/j.hjkx.201808090.
In order to realize the simultaneous treatment of low C/N municipal wastewater and high nitrate wastewater, a sequencing batch reactor (SBR), inoculated with activated sludge, was used to initiate the denitrifying phosphorus removal coupled with simultaneous nitrification and endogenous denitrification (DPR-SNED). The anaerobic/anoxic/hypoxic durations and dissolved oxygen (DO) concentration were appropriately controlled, and the nitrogen and phosphorus removal characteristics were examined. The experimental results demonstrated that, in the anaerobic/hypoxia operation mode, with an anaerobic duration of 3 h and DO concentration of 0.5-1.0 mg·L, the simultaneous nitrification of phosphorus removal (SNEDPR) system successfully began in 60 d. The effluent PO-P concentration was below 0.5 mg·L, the nutrient and COD removal efficiencies were stably maintained above 90% and 80%, respectively, and the SNED efficiency and COD efficiency reached 70% and 95%, respectively. When the operation mode was anaerobic/anoxic/hypoxic and nitrate-containing sewage was added at the beginning of the anoxic stage, DPR-SNED was achieved with the effluent PO-P concentration<0.5 mg·L, nutrient and COD removal efficiencies above 88% and 90%, respectively, and SNED efficiency and COD efficiency maintained at 62% and 90%, respectively. After the successful initiation of DPR-SNED, enhanced intracellular carbons storage was achieved by phosphorus-and glycogen-accumulating organisms using the limited carbons in raw municipal wastewater to provide sufficient carbon sources for subsequent nutrient removal. In addition, the endogenous partial denitrification ensured the efficient nitrogen removal performance of the DPR-SNED system at low C/N conditions (average 4).
为实现低C/N城市污水与高硝酸盐废水的同步处理，采用接种活性污泥的序批式反应器（SBR）启动反硝化除磷耦合同步硝化与内源性反硝化（DPR-SNED）。适当控制厌氧/缺氧/好氧时长和溶解氧（DO）浓度，并考察氮磷去除特性。实验结果表明，在厌氧/缺氧运行模式下，厌氧时长为3 h，DO浓度为0.5-1.0 mg·L时，同步硝化除磷（SNEDPR）系统在60 d内成功启动。出水PO-P浓度低于0.5 mg·L，营养物和COD去除效率分别稳定维持在90%和80%以上，SNED效率和COD效率分别达到70%和95%。当运行模式为厌氧/缺氧/好氧且在缺氧阶段开始时添加含硝酸盐污水时，实现了DPR-SNED，出水PO-P浓度<0.5 mg·L，营养物和COD去除效率分别高于88%和90%，SNED效率和COD效率分别维持在62%和90%。DPR-SNED成功启动后，聚磷菌和糖原积累菌利用城市原污水中有限的碳实现了细胞内碳储存的增强，为后续营养物去除提供了充足的碳源。此外，内源性部分反硝化确保了DPR-SNED系统在低C/N条件（平均为4）下的高效脱氮性能。
