腐植酸改良红石膏堆场理化性质的研究

Study on Physicochemical Properties of Red Gypsum Stockyard Improved by Humic Acid

为缓解我国人均耕地面积不足的问题,研究了将液体腐植酸和粉状腐植酸分别按1%、2%、3%、4%和5%的比例分3次喷洒到红石膏堆场上,老化7天后测其表层pH、堆积密度和团粒结构,选出最佳腐植酸喷洒比例,该比例下测定改良后红石膏毛细现象和浸出重金属离子浓度均符合土壤修复标准,中试种植植物的出苗率达95%,达到用腐植酸改良红石膏堆场形成土壤结构,实现"以废治废"的目的。同时,揭示了腐植酸促进红石膏形成粒径大于0.25 mm的大团聚体、减小毛细现象、酸性中和红石膏废弃物的长期可持续修复机理,为解决红石膏堆放占地污染问题和红石膏造地提供了科学依据。

In order to alleviate the problem of insufficient per capita arable land in China,the spraying of liquid humic acid and powdered humic acid into red gypsum stockyard were studied at a ratio of 1%,2%,3%,4% and 5% respectively.The surface pH,bulk density and agglomerate structure were measured to select the best humic acid spraying ratio after seven days of aging.The results showed that at this ratio,the capillary phenomena of the improved red gypsum and the concentration of leaching heavy metal ions were in line with the soil remediation standard.The emergence rate of experimental plants in the plot could reach 95%,indicating that the soil structure could be formed by using humic acid to improve red gypsum stockyard and achieve the purpose of"treating waste with waste".The mechanism of long-term sustainable remediation that humic acid on promoting the formation of large aggregate with particle size greater than 0.25 mm,reducing capillary phenomenon and neutralizing the waste of red gypsum by acid was revealed,which provided a scientific basis for solving the pollution problem of red gypsum stacking and land reclamation.