Dynamics of Aeromonas species isolated from wastewater treatment system

Abstract

Aeromonas are widely distributed in the aquatic environment, and are considered to be emerging organisms that can produce a series of virulence factors. The present study was carried out in a sanitary sewage stabilization pond treatment system, located in Lins, State of Sã o Paulo, Brazil.Most probable number was applied for estimation of the genus Aeromonas. Colony isolation was carried out on blood agar ampicillin and confirmed by biochemical characterization. Aeromonas species were isolated in 72.4% of influent samples, and in 55.2 and 48.3% of effluent from anaerobic and facultative lagoons, respectively. Thirteen Aeromonas species were isolated, representing most of the recognized species of these organisms. Even though it was possible to observe a tendency of decrease, total elimination of these organisms from the studied system was not achieved. Understanding of the pathogenic organism's dynamics in wastewater treatment systems with a reuse potential is especially important because of the risk it represents.

Detection and diversity of aeromonads from treated wastewater and fish inhabiting effluent and downstream waters

“…In this work, only a slight decrease of aeromonad numbers was noted after the WWTP treatment, but without a total removal after the treatment process, also observed by Martone-Rocha et al (2010). The same authors report A. caviae as a dominant species in the raw sewage, while Boussaid et al (1991) list A. caviae and A. hydrophila as dominant in the inlet samples.…”

“…The Aeromonas species are frequently isolated from wastewater and effluent of WWTPs, but not many studies have been published to elucidate their dynamics and distribution in those systems Baleux, 1990, 1991;Boussaid et al, 1991;Stecchini and Domenis, 1994;Imziln et al, 1998;Benchokroun et al, 2003;Maalej et al, 2003;Pianetti et al, 2004;Martone-Rocha et al, 2010;Figueira et al, 2011;Vandewalle et al, 2012). In this work, only a slight decrease of aeromonad numbers was noted after the WWTP treatment, but without a total removal after the treatment process, also observed by Martone-Rocha et al (2010).…”

“…E. coli was a frequent summer finding in vast majority of water and sludge locations, even in the unaffected stream, but with no relation to Aeromonas species occurrence in these sites. The absence of such correlation was also found in the work of Martone-Rocha et al (2010), suggesting that the aeromonads cannot be estimated by the presence of E. coli, used in standard tests for determination of water quality.…”

Aeromonas

“…Given the ability of aeromonads to grow in soil/aquatic habitats and in wastewater, they are likely members to grow within water-based sanitation systems. There is some data on reductions of aeromonads by lagooning or retention in water stabilization ponds (Monfort and Baleux, 1990;Boussaid et al, 1991;Benchokroun et al, 2003;Martone-Rocha et al, 2010;Fernandez-Cassi et al, 2016). According to the study of Monfort and Baleux (1990) the reduction of the Aeromonas spp.…”

Antibiotic Resistance inAeromonasUpstream and Downstream of a Water Resource Recovery Facility

“…Bacteria from the genus Aeromonas are ubiquitous in both natural and man-made aquatic ecosystems (Holmes et al, 1996;Martone-Rocha et al, 2010;Poffe and Op de Beeck, 1991). They are planktonic in water, but also form biofilms in sediment in freshwater streams, drinking water systems, and water resource recovery facilities (Andersson et al, 2008;Chauret et al, 2001;Keevil, 2003;Zalmum et al, 1998;Peduzzi et al, 1992;Szabo et al, 2011).…”