温度对A/O复合工艺运行效能的影响

Effect of Temperature on Operation Efficiency of Hybrid A / O Process

为研究温度对A/O复合工艺运行效能的影响,验证该工艺在北方寒冷冬季下出水水质达标的可行性,分析了其在(25±2)、(15±1)、(10±1)和(5±1)℃下的除污效能。结果表明,温度降低对系统的处理效果有显著影响。在4个温度梯度下,系统对COD的平均去除率分别为90.5%、91%、90.9%和85.3%,出水值均能满足国家一级A排放标准;对氨氮的平均去除率分别为98.4%、97.6%、95.7%和85.9%,在5℃下出水氨氮浓度不能达标;对TN的平均去除率分别为76.6%、60%、72%和59%,温度<10℃时难以实现达标。因此,在水温不低于10℃时,A/O复合系统能够实现出水水质的达标排放。

To study the effect of temperature on operation efficiency of the hybrid A/O process and check the feasibility of the process to meet the discharge standard in the cold winter in the north, the op- eration and pollutant removal performance of the process were assessed at temperatures of （25±2）℃, （ 15±1 ）℃, （ 10±1 ）℃ and （5±1 ）℃, respectively. The results showed that low temperature had a significant effect on the operation efficiency of the process. At the above temperatures, the average re- moval rates of COD in the system were 90.5% , 91%, 90.9% and 85.3% respectively, and all the effluent COD concentrations could meet the first level A criteria in the national discharge standard; The average removal rates of NH3 - N were 98.4% , 97.6% , 95.7% and 85.9% respectively, and the effluent NH3 - N concentrations at 5℃ could not meet the standard; The average removal rates of TN were 76.6%, 60%, 72% and 59% respectively, and the effluent TN concentrations at lower than 10 ℃ could not meet the standard. So, the effluent from the hybrid A,/O process could meet the national dis- charge standard when the temperature was not lower than 10℃.