低温下超声波强度对厌氧氨氧化污水处理工艺性能的影响

Effect of Ultrasonic Intensity on the Performance of Anaerobic Ammonia Oxidation Wastewater Treatment Process at Low Temperature

厌氧氨氧化技术是一种新型污水处理工程技术,广泛用于含氮工业废水的处理中,保持高厌氧氨氧化菌活性是该技术的关键。为明确低温下采用低强度超声波强化厌氧氨氧化反应时,超声强度对厌氧氨氧化菌活性的影响。通过批次试验的方法,研究了低温15℃下分别采用0.1W/cm^(2)、0.2W/cm^(2)、0.3W/cm^(2)、0.4W/cm^(2)、0.5W/cm^(2)、0.6W/cm^(2)的超声强度时,污泥的比厌氧氨氧化活性、EPS的含量以及EPS的变化规律。结果表明:初期随着超声强度的提升,厌氧氨氧化菌的活性有提高,细菌在超声波的刺激下EPS的含量也有所提高。后期随着超声强度继续提高,厌氧氨氧化菌活性有所下降,EPS含量急剧升高。当超声强度为0.3W/cm^(2)时,厌氧氨氧化菌活性最高。

Anaerobic ammonia oxidation technology is a new type of wastewater treatment engineering technology,which is widely used in the treatment of industrial wastewater containing nitrogen.Maintaining high activity of anaerobic ammonia oxidation bacteria is the key of this technology.The purpose is to clarify the effect of ultrasonic intensity on the activity of anaerobic ammonia oxidation bacteria when low-intensity ultrasonic was used to enhance anaerobic ammonia oxidation reaction at low temperature.Batch experiments were conducted to study the specific anaerobic ammonia oxidation activity,EPS content and EPS variation of sludge at low temperature of 15℃with ultrasonic intensities of 0.1W/cm^(2),0.2W/cm^(2),0.3W/cm^(2),0.4W/cm^(2),0.5W/cm^(2)and 0.6W/cm^(2).The results showed that in the early stage,with the increase of ultrasonic intensity,the activity of anaerobic ammonia-oxidizing bacteria increased,and the EPS content of bacteria increased under the stimulation of ultrasonic.In the later stage,with the continuous increase of ultrasonic intensity,the activity of anaerobic ammonium oxidation bacteria decreased and EPS content increased sharply.When the ultrasonic intensity is 0.3W/cm^(2),the activity of anaerobic ammonium oxidation bacteria is the highest.