摘要
为研究如何控制部分亚硝化系统的稳定性,在高氨氮负荷[1 kg·(m^3·d)^(-1)]和不同的双重抑制策略下启动并连续运行两个序批式反应器(sequencing batch reactors,SBRs).结果表明在温度35℃±1℃,进水氨氮负荷为1 kg·(m^3·d)^(-1)的条件下,FA和DO的双重抑制和FNA和DO的双重抑制均可成功实现高氨氮废水稳定的部分亚硝化,出水NO-2-N/NH+4-N接近1,NO-3-N浓度接近于零,满足ANAMMOX反应的进水基质要求.R1反应器在DO和FA的控制策略下,亚硝氮氧化速率从28.16mg·(g·h)^(-1)减小到0.3 mg·(g·h)^(-1)(以NO-2-N计,下同),而氨氧化速率减小43.60%,最终稳定在20 mg·(g·h)^(-1)(以NH+4-N计,下同)左右.R2反应器在DO和FNA的控制策略下,亚硝氮氧化速率从12.37 mg·(g·h)^(-1)降至0.02 mg·(g·h)^(-1),而氨氧化速率仍维持在较高水平[45 mg·(g·h)^(-1)].DO和FNA双重抑制的系统与DO和高FA双重抑制的系统相比,具有富集时间短,AOB活性高,运行稳定性强等优点,更适用于启动部分亚硝化系统及维持系统稳定性.
Two SBRs which were under high ammonia loading[1 kg·（m^3·d）^-1] and different dual inhibition with feed-batch were employed to study how to control the stability of partial nitritation system. The experimental result showed that the dual inhibition of FNA and DO or FA and DO could implement partial nitrification process at 35℃±1℃ and the ammonia concentration of 1000 mg·L^-1. The effluent NO2^-N/NH4^＋-N ratio was about 1, and the effluent NO3--N concentration was close to 0, which was suitable for the appropriate influent for the ANAMMOX. In R1, under the dual inhibition of high FA and low DO concentration, the nitrite oxidizing rate was reduced from 28.16 mg·（g·h）^-1 to 0.3 mg·（g·h）^-1 （calculated as NO2^--N, the same as below）. The ammonia oxidizing rate decreased by 43.60%, which was stable at about 20 mg·（g·h）^-1 （calculated as NH4^＋-N, the same as below）. In R^2,under the dual inhibition of high FNA and low DO concentration, the nitrite oxidizing rate reduced from 12.37 mg·（g·h）^-1 to 0.02 mg·（g·h）^-1. But the ammonia oxidizing rate remained at a higher level[45 mg·（g·h）^-1]. Comparing the nitrification performance of the two SBRs under different control strategies, the dual inhibition of high FNA and low DO concentration had the advantages of short cultivation period, high biological activity and stable operation. It is therefore more suitable for the achievement of the partial nitrification.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2017年第5期1997-2005,共9页
Environmental Science
基金
陕西省住房城乡科技开发项目(2015-K65)
关键词
双重抑制
部分亚硝化
高氨氮
序批式反应器
游离氨
游离亚硝酸
dual inhibition
partial nitrification
high ammonia nitrogen
sequencing batch reactor （SBR）
free ammonia （FA）
free nitrous acid （FNA）
