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

被引：0
|
作者：
Zhu L. [1 ,2 ]
Wu B. [1 ]
Jing H. [3 ]
Zhang W. [1 ]
Jiang L. [1 ]
Zhang H. [1 ]
机构：
[1] College of Environment, Hohai University, Nanjing
[2] Key Laboratory of lntegrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing
[3] Lishui Water Group Co., Ltd., Nanjing
来源：
Water Resources Protection | 2022年 / 38卷 / 03期
关键词：
landfill leachate; membrane concentrate; membrane distillation; membrane fouling; permeation flux; ultrasound;
D O I：
10.3880/j.issn.1004-6933.2022.03.022
中图分类号：
学科分类号：
摘要：
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 CaCO3 and humic acid, and CaCO3 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. © 2022, Editorial Board of Water Resources Protection. All rights reserved.
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页码：161 / 167
页数：6
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