吸附分离辅助下污水污泥的电脱水技术

Electro-Dewatering of Sewage Sludge Assisted by Adsorbent Material

电脱水(EDW)技术是一种污水污泥深度脱水技术,有利于降低干化过程中的热能消耗.以电脱水阴极侧水分的分离方式为研究重点,通过添加吸水材料,将水分由重力分离转变为吸附分离来提高脱水效率.同时,考察了电压和机械压力等操作条件的影响,并给出了不同工况组合的脱水效果.结果表明,添加吸水材料后,污泥最终含水率及脱水能耗明显降低,且选择合适的电压、机械压力及阴极形式对电脱水有利.在50,V、21,kPa条件下对于阴极58,μm(250目)不锈钢网,电脱水90,s可将污泥含水率由82.7%降至56.10%.

The electro-dewatering （EDW）is helpful to cut down heat consumption of sludge drying process by de- creasing deeply water content of sewage sludge. The study focused on the way of water＇s separation near the cathode, and converted the gravity separation into adsorption separation by adding absorbent material beneath the cathode to improve the efficiency of dehydration. Meanwhile, the influence of some operating conditions was inves- tigated, such as voltage and mechanical pressure, through the electro-dewatering and provided dehydration effect under different operating conditions. It showed that adsorbent material is obviously helpful to decrease the final water content of sewage sludge and reduce the power consumption, and suitable voltage, proper pressure and cathode were helpful to sludge deeply dewatering. On the condition of 50V, 21 kPa, stainless steel net of 58 lain （250 mesh） as cathode, the water content of sludze can be easily reduced from 82.7% to 56.10% in 90 seconds.