管式微滤膜在软化除硬单元中的设计与应用

Design and application of tubular micro-filtration membrane in softening and hardness-removing unit

对某矿井的反渗透浓盐水采用管式微滤膜替换澄清池进行固液分离,在进水ρ(Ca^2+)=190 mg/L、ρ(Mg^2+)=80 mg/L、ρ(总硅)=160 mg/L的条件下,通过投加Ca(OH)2、Na OH、Mg Cl2等药剂进行混凝后,采用管式微滤膜进行固液分离,出水满足ρ(Ca^2+)≤20 mg/L、ρ(Mg^2+)≤20 mg/L、ρ(总硅)≤20 mg/L的要求,达到反渗透进水浊度≤1 NTU、SDI≤5的要求。详细介绍了管式微滤膜的技术特点,重点剖析了建筑物、工艺设备的设计要点,考察了运行成本。

According to the characteristics of mine reverse osmosis strong brine,tubular micro-filtration membrane was used to replace clarifier for solid-liquid separation.Under the condition that,the mass concentrations of Ca^2+,Mg^2+,total silicon were 190,80,160 mg/L respectively,after dosing Ca(OH)2、Na OH、Mg Cl2and some other agents for coagulation,tubular micro-filtration membrane was adopted for liquid-solid separation.The mass concentrations of Ca^2+,Mg^2+and total silicon in the effluent water were all not above 20 mg/L,which met the quality requirement of reverse osmosis influent water(turbidity not above 1 NTU,SDI not above 5).The technical features of the said technology were introduced in detail,the key points of the structures and process equipments design were elaborated analyzed,besides,the operation cost was also investigated.