管式微滤膜在电厂脱硫废水处理的应用研究  

Application of Tubular Microfiltration Membrane in the Treatment of Desulfurization Wastewater from Power Plant

作　　者：张净瑞 ZHANG Jing-rui(Shengfa Environmental Protection(Xiamen)Co.Ltd.,Xiamen Fujian 361021,China)

机构地区：[1]盛发环保科技(厦门)有限公司,福建厦门361021

出　　处：《环境科学导刊》2022年第6期44-48,共5页Environmental Science Survey

摘　　要：针对脱硫废水预处理工艺的现状,结合化学沉淀软化工艺,探究了管式微滤膜处理脱硫废水的边界条件。中试实验结果表明,进水硬度离子和悬浮物浓度对管式微滤膜的产水通量具有不同程度的影响:进水Ca^(2+)浓度在6000 mg/L以内,对管式微滤的产水通量影响较小;进水Mg^(2+)浓度超过800 mg/L或悬浮物浓度超过70000 mg/L时,管式微滤的产水通量迅速下降,运行稳定性降低。通过表征分析,造成膜通量速降的主要原因是Mg(OH)2颗粒物引起的膜孔堵塞。连续运行实验表明,将进水Mg^(2+)浓度控制在800 mg/L之内、进水悬浮物控制在70000 mg/L以下,管式微滤膜的出水浊度在3NTU以下且产水通量稳定在2000 LMH以上。研究结果可为管式微滤膜在电厂脱硫废水处理的工程应用提供设计及运行指导。In view of the present situation of desulfurization wastewater pretreatment technologies,the boundary conditions of the application of tubular microfiltration membrane combined with chemical precipitation softening process for treatment of desulfurization wastewater were studied.The pilot test results showed that the hardness ions and suspended solids concentration had different effects on water flux of tubular microfiltration membrane.The influent Ca^(2+)concentration had little influence on water flux of tubular microfiltration membrane when its concentration was less than 6000 mg/L.When the influent Mg^(2+)concentration exceeded 800 mg/L or the suspended matter concentration exceeded 70,000 mg/L,the water flux of tubular microfiltration membrane decreased rapidly and the operation became unstable.The main reason for rapid decrease of membrane flux was that Mg(OH)2 particles blocked the membrane pores.In the continuous operation test,the concentrations of influent Mg^(2+)and suspended solids were controlled below 800 and 70,000 mg/L respectively.The turbidity index of the water produced by tubular microfiltration membrane met the requirements of reverse osmosis influent,and the flux was stable and higher than 2000 LMH.The results can provide design and operation guidance for the engineering application of tubular microfiltration membrane in treatment of desulfurization wastewater from power plants.

关 键 词：脱硫废水 硬度离子 管式微滤膜 中试试验 

分 类 号：X703[环境科学与工程—环境工程]