超声辐照-活性污泥联合处理焦化废水

选取昆明焦化制气厂的实际焦化废水为处理对象,用水质模型对超声辐照-活性污泥法处理焦化废水中有机物的降解进行了研究.实验结果表明,焦化废水初始浓度、曝气方式和声能密度对焦化废水中COD_Cr的降解效果影响显著.对初始浓度为807mg/L的实际焦化废水,选择空气作为曝气气体,向废水中曝气而不超声时,废水中COD_Cr降解率仅为4.5%;在声能强度为119.4kW/m²条件下,超声时其降解率可达65%;采用超声辐照-活性污泥法联合处理焦化废水COD_Cr,与单独采用活性污泥法相比,废水的COD_Cr降解率可由单独采用活性污泥法的45%提高至81%;经超声波预处理后的废水,加活性污泥后,其耗氧速率有明显的降低,说明经超声波预处理后的焦化废水对生物无毒性.

Treatment of Carbonization Effluent by the Ultrasonic Radiation and Activated Sludge Process

The paper deals with the degradation of organic pollutants by the ultrasonic irradiation activated sludge process. The treatment of the real coking wastewater of Kunming coke making gas plant was studied with the water quality model. Using the ultrasonic irradiation activated sludge process the organic pollutants in the real coking wastewater can be degraded effectively. The influence factors of the ultrasonic degradation effect such as initial concentration, aerated gas and ultrasonic density were investigated and mechanism was explored. The result shows that the ultrasonic degradation effect was high with the decrease of initial concentration of the COD_Cr , the presence of aerated gas and the increase of ultrasonic density. At the initial COD_Cr concentration of 807mg/L, when air acted as aerated gas and only air itself (no ultrasound) was exerted on the wastewater, the degradation rate of the COD_Cr will be 4.5%. However, when the ultrasound of the intensity of 119.4kW/m² was exerted on the wastewater, the degradation rate of the COD_Cr will be 65%. Compared with the activated sludge process alone, the combination of the ultrasonic irradiation and activated sludge process can increase the degradation rate of the COD_Cr from 45% to 81%. The oxygen consumption rate of the carbonization effluent obviously decreased in the presence of the activated sludge. This shows the carbonization effluent is not biotoxic behind the ultrasonic irradiation.