垃圾渗滤液膜浓缩液超声强化直接接触膜蒸馏处理工艺  

Ultrasonic enhanced direct contact membrane distillation for treatment of landfill leachate membrane concentrate

作　　者：朱亮[1,2] 吴彬 经欢欢 张伟 姜龙杰 章豪 ZHU Liang;WU Bin;JING Huanhuan;ZHANG Wei;JIANG Longjie;ZHANG Hao(College of Environment,Hohai University,Nanjing 210098,China;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,Hohai University,Nanjing 210098,China;Lishui Water Group Co.,Ltd.,Nanjing 211200,China)

机构地区：[1]河海大学环境学院,江苏南京210098 [2]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [3]南京溧水水务集团有限公司,江苏南京211200

出　　处：《水资源保护》2022年第3期161-167,180,共8页Water Resources Protection

基　　金：内蒙古自治区科技重大专项(ZDZX2018054)。

摘　　要：为提高膜蒸馏在处理垃圾渗滤液膜浓缩液时渗透通量的稳定性,设计了一种新型的超声强化直接接触膜蒸馏(US-DCMD)装置,试验研究了超声对膜渗透通量的影响,并采用电子显微镜、X射线能量色散光谱等手段分析超声对膜面污染层的影响。试验结果表明:在60W的超声辐照条件下,渗透通量最高提升19.4%,并在膜溶液浓缩系数达到4时,相对渗透通量最高维持在77.1%,而未施加超声的相对渗透通量在膜溶液浓缩系数为2时降至20.7%;膜面的主要污染物为CaCO_(3)及腐殖酸,其中CaCO_(3)是限制膜渗透通量的主要因素;超声使污染层钙的质量分数从25.6%降至15.0%,并且不会引起有机物的降解或改性;超声辐照使膜面污染层不均匀且存在裂隙,减少了污染层厚度,维持了渗透通量的稳定。In order to improve the flux stability of membrane distillation in the treatment of landfill leachate membrane concentrate,a new ultrasound-assisted direct contact membrane distillation(US-DCMD)device was designed.Experiment was carried out to study the effect of ultrasound on membrane flux and analyze the effect of ultrasound on the membrane fouling layer by means of electron microscopy and energy dispersive X-ray spectroscopy.The experimental results showed that under the condition of 60W ultrasonic irradiation,the permeation flux increased by 19.4%,and when the concentration coefficient of membrane solution reached 4,the relative permeation flux was maintained at 77.1%,while the relative permeation flux without ultrasonic irradiation decreased to 20.7%when the concentration coefficient of membrane solution was 2.The main pollutants on the membrane surface were CaCO_(3) and humic acid,and CaCO_(3) was the main factor limiting the membrane flux.Ultrasound reduced the calcium mass fraction of the contaminated layer from 25.6%to 15.0%and did not cause degradation or modification of organic matter.Ultrasonic irradiation made the fouling layer on the membrane surface uneven and fissured,which reduced the thickness of the fouling layer and maintained the flux stability.

关 键 词：膜蒸馏 超声 膜污染 垃圾渗滤液 膜浓缩液 渗透通量 

分 类 号：X703[环境科学与工程—环境工程]