摘要
目的研究电极固定和移动两种布设方式对脱水污泥脱水性能及理化性质的影响,提高污泥脱水效率,降低系统能耗,实现污泥高效脱水.方法通过采用电极固定和移动两种布设方式分别对机械脱水后污泥进行电动处理,比较两种电极布设方式对脱水过程中的电渗流、含水率、温度、总磷、重金属形态及脱除水性质的影响.结果试验中固定电极组电渗流速呈下降趋势,而移动电极组电渗流速显著提高,通电40 h时移动电极电渗流量为156.1 g,是固定电极的2.4倍;污泥的含水率由阳极到阴极呈现逐渐增大趋势,且移动电极组污泥的含水率均比固定电极组低,移动电极阴极污泥最终含水率达到57.5%;固定电极污泥的温度逐渐升高到峰值并保持不变,而移动电极污泥的温度随着阳极移动在达到峰值后逐渐降低,其温度低于固定电极组;移动电极阴极污泥磷的下降幅度较固定电极大;重金属性质向稳定趋势转变,且固定电极阴极处重金属较稳定;污泥脱除水中COD、氨氮、TP都呈现上升趋势,且移动电极移动速率越大上升幅度就越大.结论移动电极装置较固定电极装置的脱水效果好,能耗低.
The aim of this paper is to study the effects of two kinds of electrode arrangement on dewatering performance and physicochemical properties of dewatering sludge,thus to improve the dewatering efficiency and reduce the energy consumption,further achieve efficient sludge dewatering. The mechanically dewatered sludge is treated with fixed and movable electrode layout way,respectively. The electricity flowin the process of dehydration,temperature,moisture content,total phosphorus,heavy metal forms and removable water property are tested. The results showthat：electroosmotic flowrate is decreasing in the fixed electrode test,while increased significantly in movable electrode test,the content of electroosmosis flowis 156. 1 g after 40 h electrokinetic treatment in movable electrode test,which is 2. 4 times that of the fixed electrode test; The moisture content of the sludge was gradually increased from anode to cathode,and the moisture content of the sludge in the movable electrode group was smaller than that of the fixed electrode group,and the final cathode sludge moisture content in the movable electrode test is reached to 57. 5%. The temperature of the fixed electrode sludge gradually rises to the peak and remains stable,while the temperature of the movable electrode sludge gradually decreases as the anode movement reaches its peak,and its temperature is lower than that of the fixed electrode group. The decrease of the cathode sludge phosphorus in the movable electrode is much higher than that of the fixed electrode.The heavy metal is changed to stable form in both test groups,moreover the heavy metal in the fixed electrode cathode is more stable. The COD,ammonia nitrogen and Total phosphorus（TP） in the removable water are increased,furthermore the higher the movement rate of the movable electrode,the larger of the increase rate. Conclusion is that the dehydration effect of movable electrode test is better than that of fixed electrode test,and the energy consumption is lower.
作者
黄殿男
李琳
傅金祥
张文标
HUANG Diannan;LI Lin;FU Jinxiang;ZHANG Wenbiao(Liaohe River Basin Water Pollution Prevention and Control Institute,Shenyang Jianzhu university,Shenyang,China,110168;Shenyang Need Environmental Protection Equipment Corporation,Shenyang,China,110031)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第4期759-768,共10页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家水体污染控制与治理科技重大专项(2014ZX07202-011)
辽宁省高等学校基本科研项目(LJZ2017011)
辽宁省教育厅项目(LJZ2016028)
辽宁省科技厅工业攻关产业化项目(2015229011)
关键词
污泥
固定电极
移动电极
脱水效果
电渗流
sludge
fixed electrode
movable electrode
dewatering effect
electroosmotic flow
