温度对厌氧氨氧化反应器脱氮效能稳定性的影响

Effect of Temperature on Stability of Nitrogen Removal in the ANAMMOX Reactor

采用厌氧氨氧化反应器,通过氮去除速率的测定,研究了不同温度变化方式对反应器脱氮效能稳定性的影响.结果表明,温度在26～37℃之间变化时,氮去除速率在1.51～1.84 kg.(m3.d)-1之间波动.其中逐渐降温的氮去除速率变化幅度4.35%,比阶梯降温(氮去除速率变化幅度9.03%)更有利于厌氧氨氧化反应器脱氮效能的稳定.当温度低于20℃时,反应器氮去除会快速下降.特别当温度低于15℃时,反应器氮去除速率下降至0.55 kg.(m3.d)-1,同时出现大量的NO2--N积累,从而抑制厌氧氨氧化反应.对其进行线性拟合发现,低于20℃时温度与氮去除速率具有明显的线性关系.根据温度变化对反应器氮去除速率稳定性的影响,提出了厌氧氨氧化反应器快速启动及实现低温高效运行的控温策略.

The effect of temperature on stability of nitrogen removal efficiency was investigated in an ANANMMOX reactor by measuring the nitrogen removal rate.The results showed that the nitrogen removal rate changed between 1.51 kg·（m3·d）-1and 1.84 kg·（m3·d）-1 when the temperature was between 26℃ and 37℃.Compared with gradually degrading temperature（nitrogen removal rate variation of amplitude 9.03%）,the ladder degrading temperature was more advantageous on the stability of nitrogen removal efficiency.Nitrogen removal rate variation of amplitude was 4.35%.The nitrogen removal rate dropped quickly,when the temperature was below 20℃.Moreover,a large number of NO-2-N accumulated in the ANAMMOX process,when temperature is below 15℃ in the reactor.A strong relationship between temperature and nitrogen removal rate was found,when the temperature was below 20℃.Based on the effect of temperature on nitrogen removal rate,the strategy about temperature control was proposed to achieve the fast start-up and high efficiency of nitrogen removal under low temperature for the ANANMMOX reactors.