Decoloration of textile wastewater by means of a fluidized-bed loop reactor and immobilized anaerobic bacteria

Georgiou, D.; Aivasidis, A.

doi:10.1016/j.jhazmat.2005.11.081

Cited by 48 publications

(25 citation statements)

References 23 publications

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“…Activated carbon or coagulants can be used as complements, which normally generates a high amount of sludge that needs to be properly handled (Santos et al, 2009). An important wastewater treatment technology that has been researched for azo dye removal is anaerobic digestion (Georgiou and Aivasidis, 2006). Some electrophilic contaminants, such as azo dyes, can be used as final electron acceptors in anaerobic environments, thereby leading to the reduction of the chromophore system and color removal.…”

Section: Introduction and Relevancementioning

confidence: 99%

Influence of the Applied Organic Load (Olr) on Textile Wastewater Treatment Using Submerged Anaerobic Membrane Bioreactors (Sambr) in the Presence of Redox Mediator and Powdered Activated Carbon (Pac)

Baêta

Lima

Silva

et al. 2016

Braz. J. Chem. Eng.

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-This paper evaluated the treatment of textile wastewater in submerged anaerobic membrane bioreactors (SAMBR) operated on a bench scale. Particularly, the influence of operational conditions, such as the applied organic rate (OLR) and the dilution factor (for toxicity attenuation) of the textile wastewater, was evaluated on color and organic matter removal. In addition, the effect of powdered activated carbon (PAC) on SAMBR-1 and the addition of yeast extract (source of the redox mediator riboflavin) were also investigated. The results showed that reducing the textile wastewater dilution factor from 10× (phase 1) to 4× (phase 2) and 0× (no dilution) decreased the COD and color removal efficiencies in both SAMBRs, probably due to an increase in the toxic load. Nevertheless, PAC adsorbed toxic compounds found in the textile wastewater and helped biomass acclimatization, which led to higher COD and color removal efficiencies in SAMBR-1. The presence of yeast extract enhanced color removal efficiencies 3-fold in both SAMBRs when they were fed with undiluted textile wastewater.

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Section: Introduction and Relevancementioning

confidence: 99%

Influence of the Applied Organic Load (Olr) on Textile Wastewater Treatment Using Submerged Anaerobic Membrane Bioreactors (Sambr) in the Presence of Redox Mediator and Powdered Activated Carbon (Pac)

Baêta

Lima

Silva

et al. 2016

Braz. J. Chem. Eng.

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“…In other words, Dye L at the reactor exit should decrease when the HRT increases. Along with this effect, the observation of Senan et al [21], Ong et al [33], Bras et al [28], Georgiou and Aivasidis [37] and the relations reported by van der Zee and Villaverde [2] may be interpreted.…”

Section: Bioreactor Design and Operational Strategy For Azo-dye Convementioning

confidence: 55%

“…Proper selection of the operating conditions makes it possible to control biofilm-growth while preventing reactor clogging. Typically, the reactor is operated as a CSTR by establishing large recycle of the liquid stream [36,37].…”

Section: The Biofilm Reactor As a Tool For Process Intensificationmentioning

confidence: 99%

Bioreactors for Azo-Dye Conversion

Olivieri

Donato

Marzocchella

2010

The Handbook of Environmental Chemistry

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This chapter embodies two sections. In the first section a survey of the state of the art of azo-dye conversion by means of bacteria is presented, with a focus on reactor design and operational issues. The relevance of thorough characterization of reaction kinetics and yields is discussed. The second section is focused on recent results regarding the conversion of an azo-dye by means of bacterial biofilm in an internal loop airlift reactor. Experimental results are analyzed in the light of a comprehensive reactor model. Key issues, research needs and priorities regarding bioprocess development for azo-dye conversion are discussed.

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“…1 However, the discharge of azo dye wastewaters into the environment results in environmental and public health risks due to its toxicological effects and bioaccumulation. 2 The azo molecule contains -N N-system linked with two aromatic rings, which makes it stable and difficult to decompose. Current physicochemical methods used to treat azo dye wastewaters have technical and economic limitations, such as low efficiency, high cost, and the creation of secondary pollutants.…”

Section: Introductionmentioning

confidence: 99%