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Vegetative cover for phosphogypsum dumps: A Romanian field study

Petrisor I.G., Komnitsas Konstantinos, Lazar I., Voicu A., Dobrota S., Stefanescu M., Kuperberg M.

Πλήρης Εγγραφή

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Περίληψη

Intensive mining and processing activities along the Romanian Black Sea Coast have resulted inthe production of millions of tons of waste that has been disposed without any treatment intailing dumps. At Navodari, 20 km north of Constanta harbor, over 3,000,000 m3 ofphosphogypsum, deposited in three stacks, represents a permanent threat to the surroundingenvironment and human population. High levels of toxic metals and radionuclides, along withelevated sulfate concentrations, are examples of problems associated with these stacks, accordingto a complex environmental characterization and risk assessment study. Consequently, vegetativecover might substantially reduce the risk of contaminant migration, under the coastal climate ofhigh rainfall and strong winds. In this paper, a field research effort to cover phosphogypsumresidue with suitable vegetation is presented. Several remediation schemes, based on greenhouseexperiments have been successfully deployed in the field. These schemes used differentcombinations of soil amendments and plant species. Periodic investigations on plant growth andmetal uptake, as well as enzymatic activities in the substrates were carried out. On the basis ofthis 18-month experiment, an efficient rehabilitation scheme is proposed

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