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RECOVERY OF SEWAGE SLUDGE ON AGRICULTURAL LAND IN LOMBARDY: CURRENT ISSUES AND REGULATORY SCENARIOS
Autori: Maria Cristina Collivignarelli
Data aparitiei: Iulie / 2015
Revista: Environmental Engineering and Management JournalVol. 14Nr. 7
ISSN: 1843 - 3707
Pret: 25.00 RON    
N.A.

Abstract
Issues concerning the treatment and the recovery/disposal of sludge derived from the municipal WWTPs (Wastewater Treatment
Plants) are gaining importance both in Italy and abroad. In Lombardy Region this aspect is particularly relevant due to both the
amount of sludge produced and its remarkable reuse in agricultural soils. This paper discusses different strategies for land
application of sludge in order to provide technical and regulatory guidance at regional level. The work is based on a survey
concerning qualitative and quantitative characteristics of sewage sludge (derived from WWTPs and sent to Sludge Treatment
Plants – STPs – authorized for the treatment on behalf of third parties) reused for agricultural application. Then, the effects of six
different regulatory scenarios (considering the rules of the European Commission, national legislation and the laws of regions
neighbouring to Lombardy) on the qualitative characteristics of sludge reused in agricultural soils have been evaluated. The
results of this work have been incorporated into regional guidelines that were approved with Decree of Regional Government
(DGR) n. X/2031 dated 1 July 2014. On the basis of this work, the principles of the regional guidelines are: 1) improvement in
the quality of the sludge spread on agricultural land; 2) protection of the high-quality sludge (ingoing to the STPs), avoiding its
mixing with other sludge suitable for agricultural reuse, but with qualitative characteristics closer to the regulatory limits; 3)
minimization of the problems concerning the odour emissions (one of the main critical issue).



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