关键词:

微生物, 生物聚合铁, 制备周期, 膜通量

Abstract:

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 Fe²⁺, 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 Fe²⁺ 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.

Key words:

微生物, 生物聚合铁, 制备周期, 膜通量