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Background Wastewater treatment plants (WWTPs) are designed and operated to protect the environment from polluting compounds and, when possible, to recover energy and matter (as nutrients and water for example). While most of Europe’s WWTPs are currently removing biodegradable organic compounds satisfactorily, the removal of nutrients (nitrogen and phos ...

Background People living in industrial tannery districts, especially those close to wastewater treatment plants, have traditionally experienced poor air quality and odour problems caused by emissions of hydrogen sulphide (H2S) and other sulphurous compounds. The Santa Croce sull’Arno tannery district in Tuscany produces more than 80% of all Italian foot ...