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Depurazione a fanghi attivi

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Depurazione a fanghi attivi

I fanghi attivi (o fanghi attivati) sono una sospensione in acqua di biomassa attiva (batteri saprofiti, protozoi, amebe, rotiferi e altri microrganismi), solitamente sotto forma di fiocchi.

Tali fanghi sono alla base dei sistemi di ossidazione biologica a fanghi attivi, che sono i più diffusi nei tradizionali impianti di depurazione o meglio impianti di trattamento delle acque reflue.

Il ruolo di questa biomassa (presente soprattutto sotto forma di fiocchi sedimentabili costituiti da materia organica e dalle colonie di batteri che di essa si nutrono) nel processo depurativo è quello di utilizzare le sostanze organiche biodegradabili presenti nel refluo, degradandole a composti più piccoli e meno pericolosi che in parte vengono utilizzati dai microrganismi stessi per il proprio nutrimento e la riproduzione.

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