加载连续流电磁波对回流污泥脱氢酶活性的影响

Effect of Continuous Flow Electromagnetic Wave Loading on Dehydrogenase Activity of Returned Sludge

为了探究加载电磁波对回流污泥的影响,选取脱氢酶活性为代表,取污水处理厂回流污泥,采用连续流2 450 MHz电磁波进行加载,探究电磁波加载功率、加载时间和污泥流量对污泥生物活性的影响,考察将电磁波加载污水处理厂回流污泥实现污泥过程减量的可行性。当电磁波加载功率为100 W时,污泥脱氢酶活性提高了85. 38%;在加载功率为100～600 W、加载时间为25～150 s时,脱氢酶活性呈显著下降趋势,且与污泥温度和上清液SCOD呈此消彼长之势;当污泥流量为2 L/h时,污泥脱氢酶活性突然显著降低,之后随污泥流量增大则活性逐渐上升。相关性分析结果显示,污泥脱氢酶活性与加载功率、加载时间呈显著负相关,与污泥流量呈显著正相关,影响程度的大小顺序为:污泥流量>加载功率>加载时间;同时,污泥脱氢酶活性与温度、SCOD均呈显著的负相关。

To verify the feasibility for reduction of sludge through electromagnetic wave loading returned sludge,dehydrogenase activity was selected as the representative,and the effects of loading power,loading time and sludge flow on the dehydrogenase activity of returned sludge taken from sewage treatment plant were studied under the continuous flow electromagnetic wave with 2450MHz.The results showed that the dehydrogenase activity of returned sludge increased by 85.38% when the electromagnetic wave power was 100W.However the dehydrogenase activity showed a significant downward trend and was negatively related to the sludge temperature and SCOD of supernatant when the loading power and loading time were 100-600W and 25-150s respectively.In addition,the dehydrogenase activity decreased rapidly when the sludge flow was 2L/h,and then it gradually increased with the increase of sludge flow.The results of correlation analysis revealed that the dehydrogenase activity was negatively correlated with the loading power and loading time of electromagnetic wave,temperature and SCOD, while positively correlated with the sludge flow.The influence level of the factors was :sludge flow >loading power >loading time.