堆置法处理油污土壤参数的优化

Parameters optimization of treating oily soil by windrow composting

为了探究堆置法处理油污土壤的作用效果,采用单因素实验确定石油初始浓度、温度、土壤含水量、有机质含量、土壤C/N、菌剂浓度相关因素的水平取值范围。以石油烃降解率为评价指标,再通过正交实验进一步优化相关参数,确定最佳条件。结果表明:以石油初始浓度2%、温度35℃、土壤C/N 10∶1为控制变量;以菌剂浓度(X)、有机质含量(Y)、土壤含水量(Z)为变化因素设计正交实验组合L9(34)。可以得出,堆置法处理油污土壤的最佳水平组合为X2Y2Z3,即菌剂浓度5×109cfu·kg^(-1),有机质含量为5%,土壤含水量为60%。

To study the factors that can result in effective degradation of oil-contaminated soil by windrow composting,we performed single-factor experiments to research the ranges of oil concentration,temperature,soil moisture content,organic matter content,soil C / N,and microbial inoculum concentration. Considering the degradation rate of petroleum hydrocarbon as the evaluation index,the optimum engineering parameters were determined by performing orthogonal experiments. An orthogonal design of about L9（ 34） by using an oil concentration of 2%,temperature of 35 ℃,and soil C / N as 10 ∶ 1 as control variables and considering the microbial inoculum concentration（ X）,organic matter content（ Y）,and soil moisture content（ Z） as the variable factors,the best combination for effective degradation of oil-contaminated soil would be X2Y2Z3 on the condition that microbial inoculum concentration is 5 × 109 cfu · kg- 1,organic matter content is 5%,and the soil moisture content is 60%.