摘要
为优化污泥电脱水过程控制及明确其关键影响因素,考察了不同电压强度(0、15、35和55 V)对污泥电脱水效果的影响,并基于三维荧光光谱和分子质量分布的分析,研究了阴阳两极滤液中溶解性有机物的含量和组分变化。研究结果表明,随着电压强度增加,污泥脱水效果得到提升,在55 V电压强度下,阳极脱除滤液量相较于无电压作用下的48 mL增加到60 mL,阴极滤液量由对照的90 m L增加到102 mL。电场的作用可使污泥絮体中蛋白质类大分子有机物向阴极迁移。因此,电场辅助具有提升机械压滤脱水效果的作用,这种作用与电场作用下污泥絮体中蛋白质类有机物的迁移有关,并且,电压越强,这种作用越显著。而蛋白质的迁移导致其对水分子的束缚以及絮体间的静电平衡的改变,可能是污泥机械脱水效率得到提升的重要原因。
To optimize the electro-dewatering process and clarify the key factors related to dewatering efficiency.This study investigated the effects of different voltage intensities(0, 15, 35 and 55 V) on sludge electro-dewatering efficiency. And the concentration and composition of dissolved organic matter in the filtrate of both anode and cathode were also investigated according to 3 D-EEM and molecule weight distribution analysis. The results showed that with the increase of voltage intensity, the dewatering efficiency increased. At voltage intensity of 55 V, the amount of dewatered filtrate increased from 48 mL to 60 mL at anode, and 90 m L to 102 m L at cathode compared with mechanical pressure filtration dewatering. Electric field can make the proteins in sludge flocs migrate to cathode.Thus, an assisted electric field is benefit for enhancing sludge mechanical dewatering. And this effect is related to the migration of proteins in sludge flocs under an electric field. The stronger the voltage was, the more obvious this effect was. It was concluded that the reducing hydration with proteins and breakage of the electrostatic balance between sludge flocs may result in the improved efficiency of sludge mechanical-dewatering.
作者
鲁子烨
张堯
徐硕
杨帆
LU Ziye;ZHANG Yao;XU Shuo;YANG Fan(College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Institute of Environmental and Municipal Engineering,North China University of Water Resources and Eleetric Power,Zhengzhou 450045,China;Research Center for Eeo-Environmental Seiences,Chinese Academy of Sciences,Beijing 100085,China;Institute of Engineering and Technology,Tianjin Agricultural University,Tianjin 300384,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2018年第12期3333-3340,共8页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51308392)
关键词
污泥
电渗透
脱水性能
有机物
sludge
electro-osmotic dewatering
dewaterability
organic matters
