Decolourization of Industrial Effluents – Available Methods and Emerging Technologies – A Review

Anjaneyulu, Y.; Chary, N.S.; Raj, Deep

doi:10.1007/s11157-005-1246-z

Cited by 625 publications

(287 citation statements)

References 221 publications

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“…Various types of treatment processes that can be used to treat the dye-containing wastewater are physicochemical and biological processes. Physical processes include adsorption (Amin 2008;Anjaneyulu et al 2005;Malik 2003;Velmurugan et al 2011) and membrane filtration (Patel and Nath 2012;Petrinic et al 2007) processes. Chemical processes include coagulation-flocculation (Wong et al 2007;Golob et al 2005) and ozonation (Taplad et al 2008;Inaloo et al 2011).…”

Section: Decolourization and Degradation Of Dyes By Various Methodsmentioning

confidence: 99%

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Popli

Patel

2014

Int. J. Environ. Sci. Technol.

270

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Dyes are synthetic organic compounds widely used in various industries such as, textile, leather, plastic, food, pharmaceutical, and paints manufacturing industries. Coloured effluents are highly toxic to the aquatic life and mutagenic to humans. Wastewater containing dyes has become an important issue demanding serious attention. Among the synthetic dyes, azo dyes are the largest and most widely used dyes and account for more than half of the annually produced dyes. The biodegradation of azo dyes is difficult due to their complex structure and synthetic nature. Several treatments have been proposed for efficient azo dye removal, most of them presenting some limitations such as generation of waste sludge, high operational costs, poor efficiency, and incomplete mineralization. Biological treatment is a cost-effective and eco-friendly process for dye degradation. Sequential anaerobic-aerobic biological treatment is considered as one of the most cost-effective methods for the complete mineralization of azo dyes. The anaerobic stage yields decolourization through reductive cleavage of the dye's azo linkages, resulting in the formation of generally colourless but potentially hazardous aromatic amines. The aerobic stage involves degradation of the aromatic amines. It is the most logical step for removing the azo dyes from the wastewater. Several factors can influence the microbial activity and consequently the efficacy and effectiveness of the complete biodegradation processes. This paper summarizes the results of biological decolourization of azo dyes using various types of reactors, elaborates biochemical mechanisms involved, and discusses influence of various operational parameters on decolourization based on reports published in the last decade.

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Section: Decolourization and Degradation Of Dyes By Various Methodsmentioning

confidence: 99%

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Popli

Patel

2014

Int. J. Environ. Sci. Technol.

270

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“…Treatments using physical, chemical, and biological procedures or its combinations are well established methods for colour removal 11 . Conventional physical or chemical treatment methods such as coagulation, flocculation, filtration, adsorption, ion exchange or ultra-filtration, although efficient, often produce sludge or solid waste which requires further disposal [12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Decolourization of an azo dye in aqueous solution by ozonation in a semi-batch bubble column reactor

Abidin

Fahmi²,

Ong³

et al. 2015

ScienceAsia

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ABSTRACT:The oxidative degradation of the azo dye Reactive Red 120 by ozonation was investigated. The decolourization was carried out by bubbling ozone at the bottom of a bubble column reactor containing the dye solution. The colour, chemical oxygen demand, and total organic carbon removal were evaluated, and the contaminants were characterized based on the changes in UV-Vis and FT-IR spectra. It was observed that changes of UV-Vis spectra represent the disappearance of both azo and aromatic groups, which causes the colour removal. FT-IR analysis indicated that ozonation shifts the functional groups in the azo dye which results in decolourization, a decrease in aromaticity, and an increase in acidity. The results indicate that the chromophore is destroyed and partially mineralized to small fragments during ozonation. The alkaline pH was favourable to decomposition by ozonation, initiated by the formation of the hydroxyl radicals. The oxidation followed first-order kinetics and the completed decolourization confirmed the capability of ozonation to cleave the azo bond from the dye.

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“…Biosorbents prepared from agricultural waste and by-products have been widely studied. The ability of activated carbon, low-cost byproducts, and waste material as adsorbents to remove various dyes from aqueous solutions and wastewaters have been investigated [1][2][3][4] . While activated carbons produced from non-renewable sources such as coal are used commercially, numerous alternative adsorbents have been proposed 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Untitled

Nagda¹,

Ghole²

2011

ScienceAsia

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Meaningful waste use aimed at conservation of resources and lowering the amount of pollution is now inevitable. In the present study, the potential of tendu (Diospyros melanoxylon) leaf waste from a local beedi (cigarette) industry to remove dye from aqueous solution was studied after its pretreatment with phosphoric acid. The carbon prepared was characterized by analysis of porosity, surface area, scanning electron micrograph, cation exchange capacity, iodine, and methylene blue number. Feasibility of employing this carbon for the removal of Janus Green, a diazine dye, from aqueous solution was investigated. Dye removal was compared simultaneously with commercial carbon. The adsorption was evaluated in a batch process with different concentrations of dye as well as with different adsorbent doses, at a range of pH values, temperature, and contact time. The kinetic parameters were determined and found to follow the Lagergren pseudo first order model. The suitability of the adsorbent was tested by fitting the adsorption data with Langmuir and Freundlich isotherms. The Langmuir maximum adsorption capacity was found to be 51 mg/g, which approached the value 57 mg/g obtained for commercial carbon. The changes in standard free energy, standard entropy and standard enthalpy were calculated. The results showed that adsorption of dye onto phosphoric acid treated tendu biomass was spontaneous and found to be physical and exothermic in nature.

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Decolourization of Industrial Effluents – Available Methods and Emerging Technologies – A Review

Cited by 625 publications

References 221 publications

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Decolourization of an azo dye in aqueous solution by ozonation in a semi-batch bubble column reactor

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