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Improvement Of The Anaerobic Digestion Of Activated Sludge: Thermal And Economical Perspectives
The treatment of municipal or industrial wastewaters generates primary and secondary sludge that in medium and large wastewater treatment plants (WWTPs) are stabilized by means of anaerobic digestion (AD) processes. Due to several causes like the increasingly cogent European and national laws concer...
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Published in: | WIT Transactions on Ecology and the Environment 2014-01, Vol.190, p.979 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | The treatment of municipal or industrial wastewaters generates primary and secondary sludge that in medium and large wastewater treatment plants (WWTPs) are stabilized by means of anaerobic digestion (AD) processes. Due to several causes like the increasingly cogent European and national laws concerning the quality of sludge after stabilization, the high costs of landfilling and the profit of energy generated by renewable sources, different technologies are under consideration in order to enhance the performances of the AD of sludge, in particular secondary sludge. With reference to a WWTP with a capacity of more than 2 million equivalent inhabitants that generates an average daily flow of 6,000 m3 primary and secondary sludge, two solutions aimed at improving the performances of the AD process were evaluated considering technical and economical aspects. The possible first solution planned the thickening of secondary sludge, with the aim of searching for the optimal TS content able to guarantee the thermal sustainability of the AD process. |
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ISSN: | 1746-448X 1743-3541 |
DOI: | 10.2495/EQ140922 |