Di Palma Luca, Ferrantelli Paola, Merli Carlo, Petrucci Elisabetta
Dipartimento di Ingegneria Chimica, dei Materiali, delle Materie Prime, Metallurgia Università di Roma La Sapienza, via Eudossiana 18, 00184 Roma, Italy.
Ann Chim. 2003 Dec;93(12):1005-11.
In this study a process for the remediation of soils contaminated by lead or copper is proposed, consisting of the operations in sequence: soil flushing, membrane treatment, acidification, and metal precipitation. Pb(II) and Cu(II) extraction from a synthetically contaminated soil using a 0.05 M EDTA aqueous solution were investigated in column. The metal removal efficiencies and the final soil metal concentration were 98.2% and 37.96 mg/g respectively for lead and 95.4% and 59.20 mg/kg for copper. The extracted solutions were concentrated through a membrane treatment to reduce the water content up to the 75% and to obtain a permeate metal concentration in compliance with the Italian Environmental Regulation. The recovery of the used EDTA from the retentate solution, with recovery yield of at least 85.4%, was also obtained through acidification. Metal precipitation from the filtered solution was then performed according two different methods, achieving metal removal yield of more than 99.4%.
本研究提出了一种修复铅或铜污染土壤的工艺，该工艺按顺序包括以下操作：土壤冲洗、膜处理、酸化和金属沉淀。在柱中研究了使用0.05 M乙二胺四乙酸（EDTA）水溶液从人工污染土壤中提取铅（II）和铜（II）的情况。对于铅，金属去除效率和最终土壤金属浓度分别为98.2%和37.96 mg/g，对于铜，分别为95.4%和59.20 mg/kg。通过膜处理对提取的溶液进行浓缩，以将含水量降低至75%，并获得符合意大利环境法规的渗透液金属浓度。通过酸化还从截留液中回收了用过的EDTA，回收率至少为85.4%。然后根据两种不同方法对过滤后的溶液进行金属沉淀，金属去除率超过99.4%。
