Solidification/stabilization of lead with the aid of bagasse as an additive to Portland cement

摘要

Solidification/stabilization(S/S) of hazardous waste is a widely used technology;therefore,it is crucial to evaluate its effec5tiveness and make attempts to improve the technique.A better matrix for S/S of hazardous waste was designed that is effective and economically feasible.This was accomplished by adding bagasse (byproduct of milling or diffusing sugar cane) to the waste/cement matrix.Lead nitrate was used as the model heavy metal waste with a 10 or 15% lead by weight to cement loading.Samples were cured for 7,14,and 28 days at 24degC.Samples containing bagasse typically resulted in TCLP(modified) extract lead concentrations fo approximately 0.5 mg/l of lead for all samples,while samples containing no bagasse had lead extract concentrations of approximately 5 mg/l for 10% samples and 45 mg/l for 15%.Results indicate that using bagasse as an additive to cement effectively improved the S/S of lead.