粉煤灰固定化细胞去除聚乙烯醇的研究

Removal of poly(vinyl alcohol)by immobilized cells on fly ash

前期研究分离到一株能高效降解并矿化聚乙烯醇(PVA)的黄单胞菌(Xanthomonas sp.)。考察了利用改性处理或未处理粉煤灰吸附该菌株去除PVA的特性。结果表明,实验所采用的5种粉煤灰对该菌细胞等温吸附方程与Langmuir方程、Freundlich方程的拟合都达到很高的水平。改性粉煤灰对菌体细胞的吸附量由大到小的顺序为HC l处理粉煤灰>H2SO4处理粉煤灰>Ca(OH)2处理粉煤灰>NaOH处理粉煤灰>未处理粉煤灰。在培养初期,粉煤灰固定化细胞对PVA的去除量略低于等量游离细胞,但其去除速率的变化与游离细胞基本相同。

In previous study, a strain of Xanthornonas sp. that could degrade completely Poly （vinyl）alcohol （PVA） had been isolated. The PVA removal characteristics of this strain immobilized on raw or modified fly ash as a reserve material was investigated. The results showed that the isothermal adsorption equations of Langmuir equations, Freundlich equations perfectly modeled the processes of bacterial cells adsorption in fly ashes from 5 sampies. Cell adsorption capacity in fly ash was followed by the order of HCl-modified sample 〉 H2 SO4 - modified sample 〉 CaOH-modified sample 〉 NaOH-modified sample 〉 No-modified sample. The PVA removal capacity of immobilized cells was lower than that of free cells for 1.0g · L ^- 1 PVA, but the PVA removal rate of immobilized cells was nearly the same as that of free cells.