Abstract
The debate on sludge recycling and disposal has been recently a target of growing interest due to the expressed concern about the potential risks of its agricultural use on human health and the environment. This fact has led to revisions in government policy and regulations and many novel treatment processes have been proposed in order to make the recycling and reuse of sewage sludge sustainable. In this work, the use of some pretreatments (alkaline, thermal, and ozonation) combined with conventional anaerobic digestion has been assessed on digested sludge quality in terms of pathogens, dewatering properties, heavy metals, and organic pollutants. All pretreatments proved to be efficient to reach the requirements proposed in the Working Document on Sludge prepared by the European Commission (CEC, Council Directive of 27 April 2000 on Working Document on Sludge—third draft. Brussels: European Commission DG Environment. Retrieved from http://ec.europa.eu/environment/waste/sludge/pdf/sludge_en.pdf, 2000a) and also those established by the U.S. Environmental Protection Agency (EPA, Standards for the disposal and utilization of sewage sludge, part 503. Retrieved from http://www.epa.state.il.us/public-notices/2004/lincoln-trails-mhp/draft-permit.pdf, 1993).
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Acknowledgments
This work was supported by the Spanish Ministry of Education and Science (MICROFARM project, CTQ2007-66265). Special thanks go to the Department of Microbiology and Parasitology and the Department of Edafology of the University of Santiago de Compostela and the Department of Environmental Chemistry of the Institute of Chemical and Environmental Research of Barcelona for the analyses.
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Carballa, M., Omil, F. & Lema, J.M. Influence of Different Pretreatments on Anaerobically Digested Sludge Characteristics: Suitability for Final Disposal. Water Air Soil Pollut 199, 311–321 (2009). https://doi.org/10.1007/s11270-008-9880-z
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DOI: https://doi.org/10.1007/s11270-008-9880-z