生物固体的应用及其对重金属的影响研究

Biosolid Application and its effect on heavy metals.

本文介绍了近年来美国和欧洲对生物固体（废水处理的副产物）的研究情况。研究表明：生物固体施用于农田、林地等，可促进植物生长；生物固体的来源、性质及土壤、气候、植被等都会对施用地重金属的含量、吸收、移动及形态产生影响；植物吸收重金属受土壤有机质含量、阳离子交换量、ｐＨ、质地、铁和锰氧化物等的影响；生物固体中绝大部分重金属在施用土壤后就被有机质、碳酸盐结合为稳定的、难移动的形式，被固定的量与土壤ｐＨ、粘土矿物和有机化合物的性质有关。

Biosolids has been applied as a nutrition source to agricultural,forest and horticultural lands for several decades in the developed countries,which has obtained the significant benefits on the productivity and yields of the plants and soil fertility.However,the toxic materials,special trace metals(including their bioavailability,uptaking by plant;their concentrations in soils and the movement in the soils)in biosolids has received a great number of studies.Hundreds of articles have focused on the potential for movement and toxicity of trace metals from biosolids application.This is a complicated environmental study including waste water treatment,soil science,plant and biomass,and weather.