1. Strong minimization of biological sludge production and enhancement of phosphorus bioavailability with a thermophilic biological fluidized bed reactor.
- Author
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Collivignarelli, Maria Cristina, Abbà, Alessandro, Carnevale Miino, Marco, Caccamo, Francesca Maria, Argiolas, Stefano, Bellazzi, Stefano, Baldi, Marco, and Bertanza, Giorgio
- Subjects
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FLUIDIZED bed reactors , *SEWAGE disposal plants , *BIOAVAILABILITY , *SEWAGE sludge , *PHOSPHORUS - Abstract
[Display omitted] Identify sustainable biological sewage sludge (BSS) management represents a current challenge. In this work, pre-thickened BSS taken from a large-scale urban wastewater treatment plant (WWTP) was fed continuously for about 9 months to a semi-industrial scale thermophilic biological fluidized bed reactor (TBFBR) operating in alternate conditions. The BSS treated in TBFBR was strongly reduced (89–92%) and the production was evaluated in 0.0007–0.0023 kg kg CODremoved −1 d−1 and 0.0004–0.0014 kg kg CODremoved −1 d−1 of TS and VS, respectively. The 92% of the P-PO 4 3- and P-org precipitated in inorganic form and accumulated in thermophilic biological sludge (TBS). In basic soils with chelating activity, phosphorus contained in TBS presented a higher bioavailability (84.0 ± 25.3%) with respect to untreated sludge. The analysis of four diverse scenarios highlighted that TBFBR located after pre-thickening could save 73–96% of operating costs with respect to current situation. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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