Abstract

In the present paper, the effectiveness of a Sequencing Batch Biofilter Granular Reactor (SBBGR) and its integration with different disinfection strategies (UV irradiation, peracetic acid) for producing an effluent suitable for agricultural use was evaluated. The plant treated raw domestic sewage, and its performances were evaluated in terms of the removal efficiency of a wide group of physical, chemical and microbiological parameters. The SBBGR resulted really efficient in removing suspended solids, COD and nitrogen with an average effluent concentration of 5, 32 and 10 mg/L, respectively. Lower removal efficiency was observed for phosphorus with an average concentration in the effluent of 3 mg/L. Plant effluent was also characterized by an average electrical conductivity and sodium adsorption ratio of 680 ?S/cm and 2.9, respectively. Therefore, according to these gross parameters, the SBBGR effluent was conformed to the national standards required in Italy for agricultural reuse. Moreover, hygienization performances of the SBBGR was higher than that of conventional municipal wastewater treatment plants and met the quality criteria suggested by WHO (E. coli < 1000 CFU/100mL) for agricultural reuse. In particular, the biological treatment by SBBGR removed 3.8 ? 0.4 log units of Giardia lamblia, 2.8 ? 0.8 log units of E. coli, 2.5 ? 0.7 log units of total coliforms, 2.0 ? 0.3 log units of Clostridium perfringens, 2.0 ? 0.4 log units of Cryptosporidium parvum and 1.7 ? 0.7 log units of Somatic coliphages. The investigated disinfection processes (UV and peracetic acid) resulted very effective for total coliforms, E. coli and somatic coliphages. In particular, a UV radiation and peracetic acid doses of 40 mJ/cm2 and 1 mg/L respectively reduced E. coli content in the effluent below the limit for agricultural reuse in Italy (10 CFU/100 mL). Conversely, they were both ineffective on Clostridium perfringens spores.

Autore Pugliese

• Di Iaconi Claudio , De Sanctis Marco

Tutti gli autori

• M. De Sanctis ; G. Del Moro; C. Levantesi; M.L. Luprano; C. Di Iaconi

Titolo volume/Rivista

Science of the total environment

Anno di pubblicazione

2016

ISSN

0048-9697

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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