THE QUALITY OF THE SLUDGE PROCEEDED FROM GROUNDWATER TREATMENT
Journal Title: Present Environment and Sustainable Development - Year 2010, Vol 4, Issue 4
Abstract
The Public Service Vrancea Water Supply Rural Systems ensures rural water supply from groundwater. It owns several stations out of which two were taken into account for this study: Vulturu and Cârligele. The possibility to dispose of the resulted sludge, either by depositing or using it in agriculture, was studied. The studied materials can be safely disposed of as their chemical characteristics don’t represent a threat to the environment. They can also be used in agriculture, observing the maximum allowable limits of heavy metals contents in the soils on which sludge can be applied as stipulated by the Order No.49/2004. The use of these materials would even have an amendment effect on acid soils due to their slightly alkaline reaction. An important mineral elements contribution is also to be expected for plant nutrition. No issues regarding nitrates and ammonium contents are to be expected. The studied materials should be carefully applied, especially the Vulturu station one, because of its high zinc and cadmium contents, even if the latter doesn’t overrun the maximum allowable limit. The very low organic carbon content in the sludge resulted from the Vulturu station would bring about disequilibrium in soil if too much is used.
Authors and Affiliations
Mihaela Lungu, Rodica Lazăr, Mihaela Aldea
Keywords
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