缺氧/好氧比对连续流半亚硝化稳定性的影响

为研究不同缺氧好氧比对半亚硝化稳定性的影响,采用连续流反应器,在常温(22~25 ℃),DO(0.3~0.5mg/L)和FA协同作用下实现了全亚硝化后,转变进水为AO除磷二级出水,并逐步向半亚硝化过渡.在此过程中考察了不同缺氧好氧比(0:1、1:1、2:1和3:1)对半亚硝化稳定性的影响.结果表明,缺氧好氧比为0:1时,很难维持低NH₄⁺-N(40~70mg/L)亚硝化的稳定,缺氧好氧比为1:1、2:1、3:1时均能维持稳定的半亚硝化效果,相比之下缺氧好氧比为3:1时更加节能;在缺氧好氧比0:1,1:1,2:1,和3:1的过程中,氨利用速率分别提高了29.57%、44.27%、45.23%、49.63%.在整个过程中污泥沉降性能良好,SVI在65~130mL/g.

Influence of anoxic/aerobic ratio on stability of partial nitritation in a continuous flow process

In order to investigate different anoxic/aerobic ratio on stability of partial nitritation (PN), continuous flow reactor was used at room temperature (22~25℃). After complete nitritation (CN) was achieved through controlling FA and DO (0.3~0.5mg/L), the effluent of Anaerobic/Oxic(A/O) process removing phosphorous wastewater was used as influent to CN. Then, CN turned to PN gradually. The influence of different anoxic/aerobic volume ratios (0:1,1:1,2:1,3:1) on stability of PN was investigated. It demonstrated that PN was difficult to mantain when treating domestic sewage containing low ammonia nitrogen (40~70mg/L) at the ratio of 0:1.However, stable PN could be maintained when the ratios were 1:1, 2:1 and 3:1. The ratio of 3:1 was more efficient than the others. In the process of 0:1, 1:1, 2:1 and 3:1, ammonia utilization rate increased by 29.57%、44.27%、45.23%、49.63%, respectively. During the whole operating period, the settleability of sludge was good with volume Index (SVI) being 65~130mL/g.