Glendinning Stephanie, Lamont-Black John, Jones Colin J F P
University of Newcastle upon Tyne, School of Civil Engineering and Geosciences, Drummond Building, Newcastle upon Tyne, UK.
J Hazard Mater. 2007 Jan 31;139(3):491-9. doi: 10.1016/j.jhazmat.2006.02.046. Epub 2006 Apr 24.
The treatment and disposal of sewage sludge is one of the most problematical issues affecting wastewater treatment in the developed world. The traditional outlets for sewage sludge are to spread it on agricultural land, or to form a cake for deposit to landfill or incineration. In order to create a sludge cake, water must be removed. Existing dewatering technology based on pressure can only remove a very limited amount of this water because of the way in which water is bound to the sludge particles or flocs. Several researchers have shown that electrokinetic dewatering of sludge is more efficient than conventional hydraulically driven methods. This involves the application of a dc voltage across the sludge, driving water under an electrical gradient from positive (anode) electrode to negative (cathode) electrode. However, there have been several reasons why this technique has not been adopted in practice, not least because the, normally metallic, anode rapidly dissolves due to the acidic environment created by the electrolysis of water. This paper will describe experimentation using electrokinetic geosynthetics (EKG): polymer-based materials containing conducting elements. These have been used to minimise the problem of electrode corrosion and create a sludge treatment system that can produce dry solids contents in excess of 30%. It will suggest different options for the treatment of sludges both in situ in sludge lagoons and windrows, and ex situ as a treatment process.
污水污泥的处理与处置是影响发达国家污水处理的最具问题性的问题之一。污水污泥的传统出路是将其施用于农田，或制成饼状以便填埋或焚烧。为了制成污泥饼，必须去除水分。现有的基于压力的脱水技术由于水与污泥颗粒或絮体的结合方式，只能去除非常有限的一部分水。几位研究人员表明，污泥的电动脱水比传统的液压驱动方法更有效。这涉及在污泥上施加直流电压，在电场梯度作用下将水从正（阳极）电极驱动到负（阴极）电极。然而，这项技术在实际中未被采用有几个原因，尤其是因为通常为金属材质的阳极会由于水电解产生的酸性环境而迅速溶解。本文将描述使用电动土工合成材料（EKG）的实验：含有导电元素的聚合物基材料。这些材料已被用于最小化电极腐蚀问题，并创建一个能够产生干固体含量超过30%的污泥处理系统。它将提出在污泥泻湖和料堆中原位处理污泥以及作为一种处理工艺异地处理污泥的不同选择。
