电势梯度对真空电渗固化给水污泥效果的影响

摘要

This paper introduced the vacuum electro-osmosis dewatering technology of water treatment residual sludge. The technology combines the advantages of both vacuum filtration and elctro-osmosis and can further reduce the final moisture content of sludge. Through measurement of sludge pH value, specific conductance, Zeta potential, moisture content and moisture distribution, the influence of potential gradient on water treatment residual sludge dewatering by vacuum electro-osmosis was quantitative influenced under the potential gradient 3.0,1.5,1.0 V/cm. The results showed that the water flow from anode to cathode due to the electric field in the process of electro-osmosis. In the process of electro-osmosis water release H+and OH-which makes the pH near anode at around 3 and near the cathode at about 11.Sludge ions reduced with the water flow out andspecific conductance reduces through the electro-osmosis. The moisture content of sludge reduced to 65.5% after electro-osmosis 29 h at potential gradient of 3.0 V/cm. Results indicated that the vacuum electro-osmosis is a kind of high efficiency and low energy consumption water treatment residual sludge dewatering technology.%介绍了真空电渗固化给水污泥技术,该技术将真空、电渗两者的优势相结合,进一步降低给水污泥的最终含水率.实验中调节电势梯度为3.0,1.5,1.0 V/cm,通过测定污泥pH值、电导率、Zeta电位、含水率和水分分布,量化电势梯度对真空电渗固化给水污泥效果的影响.结果表明,由于电渗过程中电场的作用,水流从阳极流向阴极.电渗过程中水电解释放H+和OH-,使得阳极附近的pH值在3左右而阴极附近的pH值在11左右.随着电渗的进行,污泥中的离子随着水流流出,导致污泥的电导率下降.在电势梯度为3.0 V/cm下电渗90 h,污泥的含水率降至65.5%,表明真空电渗是一种高效、低能耗的固化给水污泥技术.