高含水率淤泥的流动电渗透脱水实验

为拓宽电渗透脱水实际应用范围,创新淤泥流动脱水技术,设计开发了流动淤泥电渗透脱水装置系统。研究了脱水时间、电压梯度以及离心泵功率对高含水率淤泥脱水速率及脱水能耗的影响并对装置的运行参数进行了优化。单因素实验结果表明:在3 h内,脱水速率、能耗系数基本保持稳定。在电压0~10.34 V·cm~(-1)的范围内,随着电压梯度的增大,淤泥电渗透脱水速率和能耗系数均相应增大。在水泵功率7~22 W的范围内,淤泥脱水速率与离心泵的功率呈正比关系,不同的是能耗系数随着水泵功率的增大而减小。响应面实验结果表明了在电压梯度0~10.34 V·cm-1,以及离心泵功率7~22 W的区间范围内,离心泵功率与电压梯度的交互作用并不明显,其中离心泵功率对脱水速率的影响更为显著。通过响应面实验得出在实验范围内装置的最优电压梯度和离心泵功率分别为10.34 V·cm-1和22 W,最优脱水速率为3 m L·min-1。

Experimental study on electro-osmotic dewatering of high moisture-content of sediment in the state of flow

In order to broaden the practical application scope of electroosmosis dewatering and innovated sediment dewatering technology in the flowing state, electro-osmotic dewatering device was designed and developed to study the effect of highSmoisture-content sediment dewatering rate and energy consumption under different dehydration time, voltage gradient, and pump power in the state of flow .after that,the operation parameters of the device were optimized too. The results of single factor experiments showed that the dehydration rate and energy consumption coefficient were basically stable in 3h. In the range of voltage 0V.cm-1~10.34V.cm-1, with the increase of voltage gradient, the electro-osmotic dehydration rate and energy consumption coefficient of sediment increase accordingly. In the range of pump power 7W~22W, the sediment dewatering rateis directly proportional to the centrifugal pump power. The difference is that the energy consumption coefficient decreases with the increase of the pump power. The response surface experimental results show that the interaction of centrifugal pump power and the voltage gradient is not obvious, the effect of pump power on the dehydration rate is more significant in voltage gradient 0V.cm-1~10.34V.cm-1 and 7W~22W centrifugal pump power range. Through the response surface experiment, the optimal voltage gradient and the power of centrifugal pump are 10.34V.cm-1 and 22W respectively in the experimental range,The optimum dehydration rate is 3ml.min-1.