粉煤灰固定化细胞去除聚乙烯醇的研究 ( )

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 Xanthomonas 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 samples.Cell adsorption capacity in fly ash was followed by the order of HCl-modified sample>H2SO4-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-1PVA,but the PVA removal rate of immobilized cells was nearly the same as that of free cells