磷灰石等改良剂对重金属铜镉污染土壤的田间修复研究

通过田间小区试验,研究了磷灰石、石灰、木炭、猪粪、铁粉5种改良剂对Cu、Cd复合污染土壤的改良效果。结果表明,石灰、磷灰石、木炭、猪粪降低了土壤溶液中重金属Cu、Cd的含量,提高了土壤溶液的pH,但改良效果随着时间的推移不断降低。磷灰石、石灰、木炭的加入显著降低了有效态Cu含量,但对有效态Cd含量影响较小。与猪粪相比,磷灰石、石灰、木炭显著增加了黑麦草生物量,提高了对重金属Cu、Cd的吸收能力,对该污染土壤的修复具有实践应用价值。

Field remediation of Cu/Cd polluted soil by apatite and other amendments

The amelioration effects of different soil amendments, including apatite, lime, charcoal, pig manure and iron powder, were tested under the field experiment for the remediation of Cu and Cd contaminated soil. The results showed these amendments decreased the concentrations of Cu and Cd in soil solution and increased soil solution pH, but the amelioration effect decreased with time. Available Cu decreased significantly but available Cd changed little. Apatite, lime, charcoal increased biomass and improved absorption capacity of Cu and Cd of ryegrass more than pig manure, thus should be favorable for the remediation of the contaminated soil.