碳氧调控下人工湿地净化效果的协同与拮抗研究

从人工湿地脱氮效果的重要限制因子——溶解氧和碳源着手,构建了一种人工湿地碳氧联合调控脱氮系统,研究了曝气、碳源投加、碳氧联合调控下人工湿地的净化效果.结果表明,曝气促进了TSS、COD、TN、NH_4~+-N、TP的去除,但夏季时会导致NO_3~--N的积累;碳源投加提高了TN、NO_3~--N的去除,但冬季时会导致COD去除率的下降碳氧联合调控下人丁湿地对TN、NO_3~--N的去除表现出协同作用,对NH_4~+-N、COD的去除表现出独立作用,而对TP、TSS的去除表现出一定的拮抗作用.另外,对于以氨氮为主的"低碳高氮"污水,人工湿地碳氧联合调控系统脱氮效率达87.3%,可见该强化系统适用于"低碳高氮"污水的处理.

Synergistic and antagonistic effect of treatment performance of constructed wetlands under artificial aeration and external carbon source

A new enhancing nitrogen removal constructed wetland which there were aeration pipes at the bottom of nitrification chamber and carbon addition pipes in the denitrification chamber was built, and effects of artificial aeration, external carbon source and both of them on treatment performance of constructed wetlands were investigated, based on important limiting factors for nitrogen removal in constructed wetlands, i.e. dissolved oxygen and carbon concentrations. The results showed that artificial aeration obviously improved the removal efficiency of TSS, COD, TN, NH4+-N and TP in constructed wetlands, while there was significant accumulation of NO3--N in the effluent in summer. External carbon source significant improved the removal efficiency of TN and NO3-- N in constructed wetlands, while had negative effect on COD removal efficiency in winter. Moreover, the results showed that artificial aeration and external carbon source had a synergistic effect on TN and NO3--N removal, and an independent effect on NH4+-N and COD removal, while showed an antagonism effect on the removal of TP and TSS. When the low-carbon and high-nitrogen wastewater mainly contained ammonia, the average removal efficiency of TN was 87.3% in constructed wetland under artificial aeration and external carbon source, so the enhanced system is especially suitable for treatment of wastewater with low-carbon and high-nitrogen.