气隙式膜蒸馏系统在电厂脱硫废水零排放深度处理过程中的研究

Study on Air Gap Membrane Distillation System at Power Plant Desulfurized Waste Water Zero Emission Treatment Process

为提高电厂脱硫废水的处理效率,达到脱硫废水零排放深度处理目的,本实验采用了气隙式膜蒸馏处理系统,在试验条件下研究了不同关键因素对膜蒸馏系统的影响。结果表明,当进料温度从60℃提升至78℃时,膜通量从1.64L/h·m^2提高至4.22L/h·m^2,膜通量效率提高了157.3%;当进料温度为70℃时,进料流速和冷却液流速均为30L/min时,膜通量从2.01L/h·m^2增加至3.13L/h·m^2,提高了55.7%;在整个实验过程中,膜系统出水脱盐率和截留率基本维持在99.8%～100%之间,出水质量较好。研究显示,在小试条件下,气隙式膜蒸馏系统能稳定高效地处理高浓度脱硫废水,一定程度上满足了脱硫废水零排放深度处理的要求。

To improve treatment rate of desulfurized waste water and meet zero emission target,this experiment applies air gapmem-brane distillation system.The author studies different key factors on membrane distillation system.The results show that membrane flux is from 1.64L/h·m^2 to 4.22L/h·m^2 when inlet temperature rises from 60℃to 78℃,which means membrane flux efficiency improves 157.3%.When inlet temperature is 70℃,feed flow rate and coolant flow rate both are 30L/min,membrane flux rises from 2.01L/h·m to 3.13L/h·m,whose efficiency improves 55.7%. During the whole experiment,membrane system desalination rate and interception rate maintains at 99.8%～100%, whose water quality is satisfied.The study indicates that air gap membrane distillation system is able to treat high concentration desulfurized waste water effectively and meet the demand of zero emission treatment at some level.