响应曲面法对杂化材料-SRB处理铬和氟地下水优化研究

Optimal Treatment of Chromium and Fluorine Groundwater by Hybrid Material-SRB by Response Surface

为提高杂化材料-SRB颗粒对含F^-、Cr^(6+)、SO4^(2-)等冶金区地下水的处理效果,利用响应曲面法对处理条件进行优化。在单因素试验的基础上,根据Box-Behnken试验设计原理,建立二次多项式回归模型得到以F^-、Cr^(6+)、SO4^(2-)去除率为响应值,SRB投加量、杂化材料投加量、反应温度为自变量的三元二次回归方程。结果表明,该模型合理可靠,模型优化最佳试验条件为:SRB投加量为35.78%、杂化材料投加量为301 m L、反应温度为34.9℃,该条件下实测纳米杂化材料-SRB颗粒对F^-、Cr^(6+)、SO4^(2-)的去除率分别为93.87%、99.84%、70.80%,与模型预测值基本相吻合。通过对材料进行SEM、EDS能谱分析以及XRD分析表明,去除机理包括杂化材料的吸附和SRB的还原双重作用。实验结果为解决含有该类污染物的地下水问题提供技术参考。

In order to improve the treatment effect of hybrid material-SRB particles on groundwater in smelting areas such as F-、Cr 6+and SO 2-4,the treatment conditions are optimized by response surface method.Based on the univariate test,the quadratic polynomial regression model is established to obtain the ternary quadratic regression equation with the F-、Cr 6+、SO 2-4removal rate as the response value,the dosage of SRB,the amount of the hybrid material and the reaction temperature as the independent variables according to the Box-Behnken test design principle.The results show that the model is reasonable and reliable,and the optimum test conditions are as follows:the dosage of SRB is 35.78%,the dosage of hybrid material is 300.99mL,and the reaction temperature is 34.88℃.The removal rates of F-、Cr 6+and SO 2-4 in this condition are 93.87%,99.84%and 70.80%,respectively,which is consistent with the predicted value of the model.The SEM、EDS spectrum analysis and XRD analysis of the materials show that the removal mechanism include the adsorption of hybrid material and the reduction of SRB.The results of the test provide a technical reference for solving the underground water problem containing the pollutant.