橡胶废水农田回用对土壤理化性质的影响

Influence of Rubber Wastewater Reused in Farmland on Soil Physicochemical Properties

利用干湿循环试验模拟不同浓度制胶废水直接施用于土壤,试验结果显示中低浓度制胶废水直接施用,在施用初期土壤容重平均降低了1.91%,最大持水量、毛管持水量和最小持水量分别提高了15.84%、21.29%和45.07%,水稳性团聚体提高在35%以上,对土壤理化性质调控作用显著,后期随着施用次数的增加调控作用降低。高浓度制胶废水在施用过程中土壤容重升高,持水量降低,土壤结构被破坏。说明将高浓度制胶废水直接施用会堵塞土壤孔隙,使土壤板结,土地无法耕种,而将制胶废水浓度降低后短期施用,能有效改良土壤结构,成为制胶废水农田回用的新思路。

As a kind of non-toxic, harmful, resource utilization wastewater, the rubber wastewater had become feasible in reused in farmland. The simulation experiment had directly irrigated different concentrations of rubber wastewater in the soil by using dry wet cycle. The results showed that the early soil physicochemical properties were significantly affected by directly irrigated mid-low concentration of rubber wastewater. The soil bulk density was average reduced by 1.91%; the maximum, hollow billet and minimum capacity had increased by 15.84%, 21.29%, 45.07%; water stability reunion body has increased more than 35%, but the regulation function had reduced within the number of irrigation increased. What＇s more, by irrigated high concentration of rubber wastewater, the soil bulk density had increased, the water capacity had become lower, the soil structure had been destroyed. To sum up, directly irrigate high concentration of rubber wastewater in the soil would jam soil pore, make the soil harden and couldn＇t be farmed. Instead, the soil structure could be effectively improved in a short-term irrigation by reducing the concentration of rubber wastewater. Thus, rubber wastewater reused in farmland would become a new idea.