土壤—植物系统对合成洗涤剂(LAS)净化功能的研究

通过水稻盆栽实验和沈阳西部污水生态工程土地处理系统试验,应用回归分析等方法研究了合成洗涤剂LAS在土壤-水稻系统中的净化规律和沈阳西部污水生态工程土地处理系统不同生态结构类型的土壤-植物系统对LAS的净化效果。其结果是:(1)LAS在土壤-水稻系统中的净化速率符合一级反应动力学方程,其半衰期为2S—30天,净化率达93—94％;(2)在目前沈阳西部原污水中LAS含量情况下,土壤—植物系统可使LAS浓度降低一个数量级。

SELF-DECONTAMINATION OF SOIL-PLANT SYSTEM POLLUTED WITH LAS

Self-decontamination of soil polluted with LAS was studied using pot experiments. The results showed that under the critical concentration of 200 mg/kg, the decomposition rate of LAS in rice growing soil followed the first order equation, though the rate constant varied during different periods of rice growth, and the half life of LAS was 28-30 days indicating that the loss of LAS over the whole period of rice growth could reach 93-94 percent. An investigation on land treatment system in the west of Shenyang indicated that the LAS concentration in the effluent out of the system was about one order of magnitude lower than that in the influent with LAS concentration of 0.234-0.450mg/L.