基于发酵残留物改良修复后土壤的试验研究

Experiment Study on Improving Repaired Soil Based on Fermentation Residues

为了提高修复后土壤的肥力,从而重建修复土壤的生态系统,以修复后土壤的理化性质为基础,研究基于发酵残留物改良修复后土壤的利用方案。分析经淋洗修复的镉污染土壤和经热解析修复的苯系物污染土壤与普通农田土壤的土壤肥力差异,并对两类修复后土壤添加发酵残留物,通过试验综合考察不同类型土样的碱性磷酸酶活性、土壤孔隙度和植物中污染物浓度,研究发酵残留物改良修复后重金属污染土壤和有机物污染土壤的效果。结果表明:将发酵残留物与修复后土壤配比以达到改良土壤的方法是可行的,一方面可以满足植物的生长需要,另一方面可以降低植物中污染物的浓度。

In order to improve fertility of the repaired soil and reconstruct the soil ecosystem,this paper explores the application scheme of improving repaired soil by fermentation residues based on the physicochemical properties of repaired soil.The paper analyses the differences of soil fertility among the cadmium contaminated soil by leaching remediation,the BTEX contaminated soil by thermal desorption remediation and ordinary agricultural soil.Then,by adding fermentation residues into the two types of repaired soil,the paper comprehensively investigates the alkaline phosphatase activity,soil porosity and concentrations of pollutants in the plants from different types of soil samples,and anzlyzes the effect of fermentation residues on improving the repaired soil contaminated with heavy metal and organics.The experimental results show that it is feasible to mix the fermentation residue into repaired soil to improve soil fertility,which not only meets the demand of plant growth but also reduces the concentration of the pollutants in the plant.