摘要
研发了一种新型短程硝化反硝化工艺——ANITATMShunt,它通过特殊的自控系统来控制N2O的释放。采用500 L的SBR中试装置处理消化污泥脱水上清液,经过18个月的稳定运行表明:通过短程硝化反硝化途径可以实现90%的脱氮率,并且释放的N2O不足总脱氮量的0.7%。将通过pH值、温度和在线监测的NO-2-N浓度实时计算的亚硝酸浓度与亚硝酸浓度设定值进行比对,以便对曝气过程进行调控,从而抑制了N2O的释放并实现了对SBR短程硝化反硝化工艺的自动控制。同时证实了在低溶解氧条件下,由氨氧化菌(AOB)在短程硝化反硝化过程中产生的N2O并非与高亚硝酸盐浓度有直接关系,而是与游离亚硝酸浓度有关。
A new process called ANITATM Shunt was developed to reduce the N2O emission. A 500 L pilot-scale SBR was operated for 18 months to treat digester supernatant. The nitrogen removal rate of 90% was achieved by nitrification and denitrification via nitrite, and N2O emission was less than 0.7% of the total nitrogen removed. The SBR control was based on the use of free nitrous acid （FNA） concentration set-point, calculated in real time by using pH, temperature and NO2- - N on-line measurement. The goal was to control the aeration process and limit the N2O emission. The results demonstrated that N2O emission during nitrification and denitrification via nitrite under low DO condition by AOB was not directly linked to high nitrite level, as reported in the literature, but mainly to FNA level.
出处
《中国给水排水》
CAS
CSCD
北大核心
2013年第11期1-5,共5页
China Water & Wastewater
关键词
生物脱氮
短程硝化反硝化
SBR
N2O释放
游离亚硝酸
biological nitrogen removal
nitrification and denitrification via nitrite
sequencing batch reactor （SBR）
N2O emission
free nitrous acid （FNA）
