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Abstract

The mineralisation of NTA (nitrilotriacetic acid) in the Lake Orta ecosystem has been studied before and after reclamation, by liming (carbonation). Reclamation resulted in an increase in the water's pH which had dropped to very low values, of the order of 4 units, because of industrial pollution dating from 1926. It was found that a concentration of 1 mg/l of NTA added to the lake water before liming remained unchanged even after 60 days. The same experiments, performed a year after the reclamation operation, showed that NTA in the chemical, physical and biological conditions of the lake's waters was biodegraded in times which varied between 20 and 4 days. It can therefore be presumed that the neo-colonising microbial populations are responsible for this phenomenon, which has returned Lake Orta to more natural conditions similar to those of aquatic ecosystems with an analogous degree of trophy, such as Lake Monate.

Additional information

Authors: MARENGO G, JRC Ispra (IT);LIBERT Y, JRC Ispra (IT);LOENS J, JRC Ispra (IT);MOGGION BARBAN E, JRC Ispra (IT)
Bibliographic Reference: Article: Acqua Aria - Mensile di Scienze e Tecniche Ambientali (1994) No. 2, pp. 129-133
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