基于膜分离技术的生物聚合铁的制备  

Preparation of bio-polymeric ferric sulfate based on membrane separation technology

作　　者：关晓辉[1] 张东辉[1] 张明媛[1] 秦玉华[1] 

机构地区：[1]东北电力大学化学工程学院,吉林省吉林市132012

出　　处：《化工学报》2008年第10期2622-2626,共5页CIESC Journal

基　　金：吉林省科技发展计划项目(20050505)~~

摘　　要：开展基于膜分离技术优化反复序批式工艺制备生物聚合铁(BPFS)的技术研究。考察了应用聚偏氟乙烯中空纤维微滤膜(PVDF)对微生物的分离效果,Fe2+的生物催化氧化速率,制备周期及膜的污染与处理的情况。研究表明,PVDF膜可有效分离微生物,显著提高原液中的生物量。在优化工艺的基础上,制备了全铁含量分别为60、80、100kg·m-3 BPFS,Fe2+的生物催化氧化速率分别达到1.75、1.85、1.43g·L-1·h-1,制备周期分别为15.5、21、40h,比工艺优化前分别缩短了38%、42%、18%,反应液中的生物量达到108个·ml-1数量级。实验中发现,随着分离次数和全铁含量的增加,膜污染加剧,膜通量下降;采用0.2mol·L-1的草酸钠和0.2mol·L-1硫酸的混合溶液对PVDF膜进行清洗,可基本清除膜表面的污染物,满足分离要求。Based on the membrane separation technology, bio-polymeric ferric sulfate （BPFS） was prepared with the optimized sequential batch process. The effect on separation of microorganisms, bio- catalytical oxidation rate of Fe^2＋ , preparation periods and membrane pollution were investigated by using poly-vinylidene fluoride hollow fiber membrane （PVDF） to separate microorganisms. The results showed that the biomass in BPFS obviously increased through the membrane separation process. By using the optimized process, the BPFS with total iron contents of 60kg·m^-3, 80kg·m^-3, 100kg·m^-3 were prepared. The bio-catalytical oxidation rate of Fe^2＋ reached 1.75 g ·L^-1· h^-1 , 1.85 g·L^-1·h^-1 , 1.43 g ·L^-1· h^-1, preparation periods were 15.5h, 21h, 40h, a decrease by 38%, 42;, 18% respectively as against the process before optimization. The biomass in BPFS reached the order of magnitude of 10^8 num·ml^-1. With the increase of separation time and the content of total iron of BPFS, membrane pollution was intensified seriously, and membrane flux decreased obviously. PVDF was cleaned by a mixture of 0.2 mol·L^-1 sodium oxalate and 0.2 mol·L^-1 sulfuric acid, and the scavenger can clean out the fouls from the membrane surface and satisfy the separation requirement.

关 键 词：微生物 生物聚合铁 制备周期 膜通量 

分 类 号：TQ028.8[化学工程]