Abstract:

The treatment and reduction of high-salt wastewater is one of the challenges in wastewater treatment. The feasibility of applying pervaporization to high-salt wastewater reduction was investigated. The results showed that the main parameters affecting the pervaporation performance were wastewater temperature， the vacuum on the permeate side， and the degree of turbulence on the membrane surface. In addition， salinity of the wastewater also had an impact. When the wastewater temperature was 70 ℃， the permeate side vacuum was 5 kPa and the aeration rate was 4 L/min， the membrane permeation flux was as high as 19.6 L/（m²·h）. Under the condition that mass concentration of salt in feed water 100 g/L， COD 2 000 mg/L and ammonia nitrogen 10 mg/L， the pervaporization effluent quality was stable with conductivity below 20 μS/cm， COD below 40 mg/L and ammonia nitrogen below 0.4 mg/L. The effect of pervaporization process on actual waste leachate reverse osmosis concentrate was also investigated. The membrane permeation flux could reach 15.28 L/（m²·h）， and the effluent quality could reach the requirements of industrial water reuse. The research results provide a new development direction for concentration and reduction of high-salt wastewater.

Key words: membrane separation, high-salt wastewater, pervaporation, wastewater reduction

摘要：

高盐废水的处理和减量是废水处理的难题之一。对渗透汽化工艺应用于高盐废水减量的可行性进行了探究，结果表明：影响该工艺运行效率的主要参数为废水温度、渗透侧真空度以及膜表面的紊流程度。此外，废水盐度也会产生一定影响。当废水温度为70 ℃、渗透侧真空度为5 kPa、曝气速率为4 L/min时，膜渗透通量高达19.6 L/（m²·h）。在进水中盐的质量浓度为100 g/L、COD为2 000 mg/L、氨氮为10 mg/L的情况下，渗透汽化出水水质稳定，电导率低于20 μS/cm，COD低于40 mg/L，氨氮低于0.4 mg/L。同时考察了渗透汽化工艺对实际垃圾渗滤液反渗透浓水的处理效果，膜渗透通量可达到15.28 L/（m²·h），出水水质可以达到工业水回用标准。研究结果为高盐废水的浓缩减量提供了新的工艺开发方向。

关键词: 膜分离, 高盐废水, 渗透汽化, 废水减量

CLC Number: 

• X71