目前,用微生物絮凝剂(MBF)与粉煤灰联合处理重金属的方法鲜有报道.从内蒙古地区盐碱地中筛选出一株具有较高絮凝活性的菌株HG6,16S rDNA鉴定为Oceanobacillus polygoni,以其制备出MBF.采用BBD(box-behnken design)法研究了MBF与粉煤灰联合去除废水中pb2+的最佳条件组合,设定响应值为pb2+的去除率,方差分析显示,模型F值为17.30,P=0.000 5,相关系数R2 =0.901 7,拟合模型极显著.在最优条件:粉煤灰投加量1.46 g/L,MBF投加量0.888 g/L,CaCl2投加量15.6 mL/L(1％,w/V)时,测得pb2+的去除率达到99.75％.通过傅里叶变换红外光谱、Zeta电位分析发现,MBF-HG6与粉煤灰对pb2+的捕集过程中存在电中和及吸附架桥作用机理.
In this study,the joint treatment was proposed by microbial flocculant,combined with fly ash.An efficient flocculant-producing strain HG6 was isolated from a salina area in Inner Mongolia.Based on 16S rDNA gene sequence analysis,strain HG6 was classified as Ocean obacillus polygoni.Pb2+ removal from wastewater was investigated by MBF-HG6 and fly ash using box-behnken design (BBD) method.In BBD method,Pb2+ removal efficiency was served as response value.The results from the analysis of variance demonstrated that the model was highly significant,in which the Model F value was 17.30 and P value was 0.000 5,and the correlation coefficient was 0.901 7.Results showed that the optimum technique conditions were as follows:fly ash dosage and MBF-HG6 dosage was 1.46 g/L and 0.888 g/L respectively,and CaCl2dosage was 15.6 mL/L (1％,w/V).Under the optimum conditions,the removal efficiency of Pb2+reached 99.75％.Through Fourier transforminfrared spectra (FT-IR) analysis and Zeta potential analysis,the main Pb2+ removal mechanism was electric neutralization and adsorption bridging.
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