Nitrogen and Phosphorus Retention Properties and Copper Stabilization of Magnesium-based Biomass Charcoal on Contaminated Sediments
In order to study the effect of biomass charcoal material on nitrogen and phosphorus retention and copper stabiliza-tion in river sediment,water hyacinth was used as raw material to prepare the biomass biochar(MgO@BC)by one-step impregnation-roasting method.The prepared biochar(MgO@BC)was added to polluted river sediments at the proportions of 0％(CK),0.1％,1％,and 2％as the stabilization material.The effects of MgO@BC on the physicochemical properties,nitrogen and phosphorus retention,copper leaching toxicity(TCLP)and morphological distribution of the contaminated sediment were investigated by the stabilization test.The results showed that after 75 d of stabilization treatment,the pH,electrical conductivity(EC),and organic matter(SOM)of the sediment were increased and the cation exchange capacity(CEC)was slightly decreased.Compared with the CK group,the addition of magnesium-based biomass charcoal(MgO@BC)had a significant retention effect on the effective phosphorus in the river sediment,and the ammonia and nitrogen content in the sediment was reduced to the appropriate range.The additions of 1％and 2％of MgO@BC can reduce the TCLP-Cu content by 9.54％and 26.98％,respectively,and the proportion of the stabilized form of Cu(F3+F4)was slightly increased.It showed that MgO@BC can be used as a good heavy metal stabilization material in the field of river sediment remediation.
magnesium-based biocharcontaminated river sedimenteffective phosphoruscopperstabilization
万方数据
维普
