UV treatability test for chemical and petrochemical wastewater

Castillo, Lourdes V.; Khorassani, H. El; Trebuchon, P.; Thomas, Olivier

doi:10.2166/wst.1999.0625

Cited by 6 publications

(3 citation statements)

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“…Although conventional activated sludge systems are commonly used to treat azo dye containing wastewater [16, 29, 70-72, 172, 173], these treatment systems are inconsistent for removal of recalcitrant azo dyes and are subject to failure due to poor environmental conditions [32, 42,43,174]. The bioaugmentation of treatment systems commonly involves the use of mixed cultures of microorganisms (Table 4), and similarly can result in varying treatment efficacy depending on the abilities of the individual strains to compete with indigenous populations that are often wellacclimated to the existing environmental conditions [191].…”

Section: Bioaugmentation With Azo Dye Degrading Bacteriamentioning

confidence: 99%

Bioaugmentation of Azo Dyes

Khalid

Arshad

Crowley

2010

The Handbook of Environmental Chemistry

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Biodegradation is a cost-effective method to remove the residues of azo dyes prior to their discharge in wastewater streams from dye product industries. The efficacy of this treatment method is highly dependent on establishing an effective degrader community and maintaining environmental conditions that support the growth and activity of the degrader organisms. Although activated sludge is commonly used as a source of degrader organisms to start the process, bioaugmentation of the wastewater with highly effective strains provides a much more reliable process in which the process manager can use bacterial strains that target particular dye chemicals and metabolites to achieve complete mineralization. The most effective inoculants are able to degrade dyes over a broad concentration range, tolerate a range of environmental conditions of temperature, pH, and salinity, and persist at high population densities in competition with other microorganisms in mixed microbial cultures. The use of growth supplements such as yeast extract can further enhance the biodegradation activity. The ability to achieve complete mineralization of azo dyes depends on the control of the process in which initial decolorization takes place under microaerophilic conditions with low oxygen, followed by elimination of the dye metabolites using an aeration step. In many cases, this may be best achieved by using a mixture of bacterial strains that sequentially carry out the two-step process. Practical development of bacteria for bioaugmentation requires careful screening that is based not only on their efficacy in pure culture, but also on their ability to compete with the indigenous microbial communities in wastewater streams and ability to be produced and delivered as a stable inoculum. In the future, it may be useful to consider bioaugmentation with bacteria that contain mobile genetic elements that carry catabolic pathways, thereby allowing the genes to be introduced into the indigenous microorganisms. The ability to monitor introduced bacteria or catabolic genes will continue to be important for process optimization both in the laboratory and during operation in fullscale treatment systems.

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Section: Bioaugmentation With Azo Dye Degrading Bacteriamentioning

confidence: 99%

Bioaugmentation of Azo Dyes

Khalid

Arshad

Crowley

2010

The Handbook of Environmental Chemistry

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“…La cinétique de photodégradabilité considérée d'ordre 1, est liée au rapport de dilution pour obtenir un spectre UV sans saturation (cuve d'épaisseur 2 mm), une dilution importante entraînera une cinétique lente. 2-Castillo et al [21] ont montré l'existence d'une relation entre photodégradabilité et biodégradabilité d'un effluent : plus il est photodégradable, plus il sera biodégradable. 3-Le caractère adsorbable d'un composé peut être approché par la valeur de son coefficient de partage octanol/eau (K ow ) [22] .…”

Section: Rappels Bibliographiquesunclassified

LOFT-ERI : un outil d'aide au choix de filières de traitement d'eaux résiduaires industrielles

Muret¹,

Laforest²,

Bourgois³

2006

Environnement, Ingénierie &Amp; Développement

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LOFT-ERI : un outil d'aide au choix de filières de traitement Cette étude contribue au choix automatique de filières de traitement d'eaux résiduaires industrielles après obtention de leur spectre UV. Les filières prises en compte sont les suivantes : procédés d'oxydation avancée (H 2 O 2 /UV), traitement biologique, coagulation/floculation/filtration, adsorption sur charbon actif ou méthodes de destruction comme l'évapo-incinération. Un traitement mathématique des spectres UV permet la détermination de plusieurs paramètres conduisant au choix de filières par l'intermédiaire d'un outil informatique développé sous Excel®. L'outil a été validé avec une bonne adéquation, sur quatre échantillons provenant d'industries chimique, pharmaceutique ou mécanique. This study contributed to the automatic choice of industrial wastewater treatment lines after obtaining UV spectra. Treatment lines taken into account are : advanced oxidation processes (H 2 O 2 /UV), biological treatment, coagulation / flocculation/precipitation, activated carbon adsorption or destruction methods like incineration. For the choice of treatment processes, a UV spectra mathematical treatment aims at the determination of several parameters.A decision making tool based on the parameters and developed with Excel® has been validated with 4 different industrial samples.

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“…The hydroxyl radical can degrade large amounts of organic compounds. Systems capable of generating hydroxyl radicals include Fenton processes (chemical, electro, and photo) (Arslan-Alaton et al, 2014;Araña et al, 2001;Bing et al, 2015;Babuponnusami and Muthukumar, 2014;Chang et al, 2004;Anotai et al, 2006;Guivarch et al, 2003;Khoufi et al, 2004;Peralta-Hernandez et al, 2005;Saltmiras and Lemley, 2000;Umar et al, 2010), UV-H 2 O 2 (Castillo et al, 1999;Molkenthin et al, 2013;Peralta-Hernandez et al, 2008), O3-H 2 O 2 (Gulyas et al, 1994), photocatalysis, and radiocatalysis with titanium oxides as catalysts (Jiménez-Becerril et al, 2013), among others (Dimoglo et al, 2004;Hesse et al, 1999;Merayo et al, 2013;Oller et al, 2011). In Mexico, specifically in Coatzacoalcos-Minatitlán-Cosoleacaque, an industrial zone in Veracruz, many petrochemical companies are clustered (Gonzalez-Mille et al, 2010;Rodríguez-Dozal et al, 2012;SEMARNAT 2008), including PEMEX petrochemical complexes.…”

Section: Introductionmentioning

confidence: 99%