On site flotation for recovering polluted aquatic systems: is it a feasible solution for a Brazilian urban river?

Cunha, Daví Gasparini Fernandes; Grull, Doron; Damato, Murilo; Blum, José Roberto Coppini; Lutti, J. E. I.; Eiger, S.; Mancuso, Pedro Caetano Sanches

doi:10.2166/wst.2010.450

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…* When the pilot-scale system was operating, there was a contribution from the Tietê River waters to the total flow of the Pinheiros River. Reference: adapted from Cunha et al (2010).…”

Section: In Situ Remediation Technologiesmentioning

confidence: 99%

See 1 more Smart Citation

In situ Remediation Technologies Associated with Sanitation Improvement: An Opportunity for Water Quality Recovering in Developing Countries

Cunha¹,

Calijuri²,

Grull³

et al. 2012

Ecological Water Quality - Water Treatment and Reuse

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“…* When the pilot-scale system was operating, there was a contribution from the Tietê River waters to the total flow of the Pinheiros River. Reference: adapted from Cunha et al (2010).…”

Section: In Situ Remediation Technologiesmentioning

confidence: 99%

“…Efficiency (%) of removal (−) or increment of the in situ DAF pilot-system in the Pinheiros River. Reference: adapted from Cunha et al (2010).…”

Section: Operational Parameter or Variable (Unit) Value Or Rangementioning

confidence: 99%

In situ Remediation Technologies Associated with Sanitation Improvement: An Opportunity for Water Quality Recovering in Developing Countries

Cunha¹,

Calijuri²,

Grull³

et al. 2012

Ecological Water Quality - Water Treatment and Reuse

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Removal of chromium using rhamnolipid biosurfactant, ferrous sulfate and cationic tannin‐based flocculant in a dissolved air floating system using a central composite design (CCD)

Santos,

Lima,

Cardoso

et al. 2024

J Surfact & Detergents

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This research studied the wastewater chromium removal efficiency by dissolved air flotation (DAF) using a rhamnolipid (RL) biosurfactant as a collector. An experimental flotation DAF apparatus with 6 vessels of 2 L containing a coupled saturator injecting compressed air at 5.88 kPa in the vessels was used. The total RL concentration of the broth resulting from fermentation was 9 ± 1.0 g/L. This broth was used in nature in the DAF experiments. A central composite design (CCD) was used to optimize removal of Cr(VI) and total Cr with regards to two independent variables, pH (3.17–8.83) and iron concentration of the medium (0–225.0 mg/L), with a three assays performed at the conditions of the central point of the design. The experimental conditions for DAF were an initial hexavalent Cr concentration of 100 mg/L; RL broth volume of 500 mL; saturated with oxygen water volume of 200 mL; and a rapid mixing time of 6 min through stirring at 120 rpm. The results showed that under acidic pH conditions and with high iron concentrations, both the Cr(VI) and total Cr removal rates were highest. The optimal removal region determination was at a pH of 3.5 and iron concentration of 180 mg/L. Subsequently, cationic tannin‐based flocculant was also evaluated as a collector, and ferrous sulfate was used as a coagulant during Cr(III) removal. The best Cr(III) removal percentage was obtained at cationic polymer concentrations of 300 mg/L with Cr(III) removal of 50.8% and a pH of 5.5.

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Bacterial community composition and potential pathogens along the Pinheiros River in the southeast of Brazil

Godoy

Marcondes

Pessôa

et al. 2020

Sci Rep

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The Pinheiros River in São Paulo, Brazil, crosses through the capital city and has its confluence with the River Tiete, which comprises several reservoirs along its course. Although Pinheiros River is considered one of the heaviest polluted rivers in Brazil, little is known about its bacterial composition, their metabolic functions or how these communities are affected by the physicochemical parameters of the river. In this study, we used the 16S rRNA gene Illumina MiSeq sequencing to profile the bacterial community from the water surface at 11 points along the course of the River. Taxonomical composition revealed an abundance of Proteobacteria phyla, followed by Firmicutes and Bacteroidetes, with a total of 233 classified bacterial families and 558 known bacterial genera. Among the 35 potentially pathogenic bacteria identified, Arcobacter was the most predominant genus. The disrupted physicochemical parameters detected in this study may possibly contribute to the composition and distribution of the bacterial community in the Pinheiros River. Predictive functional analysis suggests the River is abundant in motility genes, including bacterial chemotaxis and flagellar assembly. These results provide novel and detailed insights into the bacterial communities and putative function of the surface water in the Pinheiros River.

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On site flotation for recovering polluted aquatic systems: is it a feasible solution for a Brazilian urban river?

Cited by 3 publications

References 12 publications

In situ Remediation Technologies Associated with Sanitation Improvement: An Opportunity for Water Quality Recovering in Developing Countries

In situ Remediation Technologies Associated with Sanitation Improvement: An Opportunity for Water Quality Recovering in Developing Countries

Removal of chromium using rhamnolipid biosurfactant, ferrous sulfate and cationic tannin‐based flocculant in a dissolved air floating system using a central composite design (CCD)

Bacterial community composition and potential pathogens along the Pinheiros River in the southeast of Brazil

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