Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Author:

Abbà Alessandro1ORCID,Collivignarelli Maria Cristina1,Manenti Sauro1,Pedrazzani Roberta23,Todeschini Sara1,Bertanza Giorgio34ORCID

Affiliation:

1. Department of Civil and Architectural Engineering, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy

2. Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy

3. University Research Center “Integrated Models for Prevention and Protection in Environmental and Occupational Health” (MISTRAL), Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia, Viale Europa 11, 25123 Brescia, Italy

4. Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, 25123 Brescia, Italy

Abstract

A thermophilic aerobic membrane reactor (TAMR) treating high-strength COD liquid wastes was submitted to an integrated investigation, with the aim of characterizing the biomass and its rheological behaviour. These processes are still scarcely adopted, also because the knowledge of their biology as well as of the physical-chemical properties of the sludge needs to be improved. In this paper, samples of mixed liquor were taken from a TAMR and submitted to fluorescent in situ hybridization for the identification and quantification of main bacterial groups. Measurements were also targeted at flocs features, filamentous bacteria, and microfauna, in order to characterize the sludge. The studied rheological properties were selected as they influence significantly the performances of membrane bioreactors (MBR) and, in particular, of the TAMR systems that operate under thermophilic conditions (i.e., around 50°C) with high MLSS concentrations (up to 200 gTS L−1). The proper description of the rheological behaviour of sludge represents a useful and fundamental aspect that allows characterizing the hydrodynamics of sludge suspension devoted to the optimization of the related processes. Therefore, in this study, the effects on the sludge rheology produced by the biomass concentration, pH, temperature, and aeration were analysed.

Publisher

Hindawi Limited

Subject

General Chemistry

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