| 摘要 |
<p>Treatment methods employed to chemically convert leachable metal, especially lead, in metal-bearing solid and liquid waste materials to a non-leachable form comprise mixing the material with 1) at least one compound selected from sulphates, halites, hydroxides and silicates and/or 2) a source of phosphate an ions and curing the mixture, with no secondary waste streams being generated. Preferably 1) is lime and/or gypsum. The solid and liquid waste materials include contaminated sludges, slurries, soils, wastewaters, spent carbon, sand, wire chips, plastic fluff, cracked battery casings, bird and buck shots and tetraethyl lead contaminated organic peat and muck. The method may comprise single step mixing of treatment additive(s), or a two step mixing wherein the sequence of performing the steps may be reversible.</p> |
