Effect of Compost and Copper Mining Waste for Nikel and Cadimi Sorption in Acid Soils

Abstract

Organic and inorganic amendments can enhance the soil properties for metals retention. The effect of a compost of peat and shrimp and a copper mining residue on the retention of Ni, Cd on acid soils was determined with soil samples received 10 and 30% of sorbent. The control sample were a soil sample without and 100% of sorbent. The results showed that the quantities of Ni, Cd fixed were proportional to the dose of sorbents applied. The quantities of Ni fixed varied from 5.77% in soil sample to 80.73% and 20.4% in samples with 30% CTC and RM. The quantities of Cd fixed are 25.25%; 90.2% and 31.9%, respectively. Desorption experiment was also conducted (with the solution of Mehlich-3) in order to understand the retention mechanism of Ni and Cd on the studied materials. The results showed that compost and copper mining waste both can enhance sorption capacity of soils. However, a compost enriched of peat and shrimps have greater sorption capacity than a copper mining residue containing calcite