Decolorization of simulated textile wastewater in an anaerobic–aerobic sequential treatment system

Kapdan, İlgi Karapinar; Tekol, Meryem; Şengül, Füsun

doi:10.1016/s0032-9592(02)00238-8

Cited by 60 publications

(26 citation statements)

References 24 publications

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“…However, color removal during the anaerobic period increased as the duration of the period was increased, approximately 82% for the 6-h and 93% for the 9-h duration. Similar to our results, several studies report a positive relation between the anaerobic reaction time and color removal efficiency [28][29][30][31][32][33][34]. In a study performed by Lourenço et al [10], SBR was operated to remove color under different durations of anaerobic and aerobic reaction phases.…”

Section: Resultssupporting

confidence: 89%

The effect of cyclic anaerobic–aerobic conditions on biodegradation of azo dyes

Semra

Cırık

Çınar

2011

Bioprocess Biosyst Eng

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The effect of cyclic anaerobic-aerobic conditions on the biodegradative capability of the mixed microbial culture for the azo dye Remazol Brilliant Violet 5R (RBV-5R) was investigated in the sequencing batch reactor (SBR) fed with a synthetic textile wastewater. The SBR had a 12-h cycle time with anaerobic-aerobic periods of 3/9, 6/6 and 9/3 h. General SBR performance was assessed by measurement of catabolic enzymes (catechol 2,3-dioxygenase, azo reductase), chemical oxygen demand (COD), color and amount of aromatic amines. In this study, under steady-state conditions, the anaerobic period of the cyclic SBR was found to allow the reductive decolorization of azo dye. Longer anaerobic periods resulted in higher color removal efficiencies, approximately 71% for the 3-h, 87% for 6-h and 92% for the 9-h duration. Total COD removal efficiencies were over 84% under each of the cyclic conditions and increased as the length of the anaerobic period was increased; however, the highest color removal rate was attained for the cycle with the shortest anaerobic period of 3 h. During the decolorization of RBV-5R, two sulfonated aromatic amines (benzene based and naphthalene based) were formed. Additionally, anaerobic azo reductase enzyme was found to be positively affected with the increasing duration of the anaerobic period; however; it was vice versa for the aerobic catechol 2,3-dioxygenase (C23DO) enzyme.

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Section: Resultssupporting

confidence: 89%

The effect of cyclic anaerobic–aerobic conditions on biodegradation of azo dyes

Semra

Cırık

Çınar

2011

Bioprocess Biosyst Eng

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“…The long retention times are often applied in the anaerobic phase of the reactor studies, such as 18 and 21 h. In several studies, it was reported that there is a positive correlation between the anaerobic cycle time and the color removal [30,31]. Indeed, in combined anaerobic-aerobic SBRs, since bacteria shifted from aerobic to anaerobic conditions, or vice versa, anaerobic azo reductase enzyme can be adversely affected by aerobic conditions, which is essential for aromatic amine removal, thereby resulting in insufficient color removal rate.…”

Section: Cycle Timementioning

confidence: 99%

Biodegradation of Azo Dyes in Anaerobic–Aerobic Sequencing Batch Reactors

Çınar

Demiröz

2010

The Handbook of Environmental Chemistry

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Effluent discharge from textile and dyestuff industries to neighboring water bodies is currently causing significant health concerns to environmental regulatory agencies due to the toxicity, mutagenicity, and carcinogenicity of the dyes and their breakdown products. Therefore, considerable attention has been given to evaluate the removal of dyes during wastewater treatment and in the natural environment. The most widely used dyes in industries are azo dyes, which require an anaerobic and aerobic phases for their complete biodegradation. Anaerobic stage is the first step of the treatment process in which azo dyes are reduced, resulting in toxic and colorless aromatic amines. Since breakdown products of azo dyes, which are formed when the azo bond is cleaved and color is removed, are resistant to anaerobic biodegradation, aerobic phase is therefore essential for complete biodegradation of colored effluents. Biological treatment has long been known, and the use of sequencing batch reactors (SBRs) for treating textile wastewater has attracted interest. The cyclic operations of SBR provide both color removal in anaerobic stage and aromatic amine removal in aerobic stage.

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“…Farabegoli et al (2010) have worked with the mix of aerobic-anaerobic sequencing batch reactor system and deduced the fact that the influent COD/dye ratio to be properly selected to provide the electron equivalents needed for the oxidation of dye molecule. Different reactor systems are used to treat textile effluent with different characteristics: like, submerged filtration using nano-membrane (Zheng et al 2013), Upflow anaerobic sludge bed reactor (UASB) coupled with adsorption process (Conceição et al 2013), fluidized bed reactor (Su et al 2011), microbial degradation (Agarry and Ajani 2011), combination of fixed and fluidized bed (Baban et al 2010), thermolysis , ultrafiltration (Dhodapkar et al 2007) and sequential anaerobic-aerobic treatments (Kapdan et al 2003)-to name a few. Different reaction criteria for COD removal have also been worked upon, like: ratio of volume of settled bed to bioreactor (Sokol 2003), use of catalyst system with thermolysis and coagulation treatment as well as solid content of influent (Rajasimman and Karthikeyan 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Biotreatment of textile wastewater required few potential indigenous microorganisms for biodegradation of COD (Agarry and Ajani 2011). The appropriate combination of physical or chemical methods or specific chemical and biological conditions are demanded for treating textile effluents (Agarry and Ajani 2011;Baban et al 2010;Dhodapkar et al 2007;Kapdan et al 2003).…”

Section: Introductionmentioning

confidence: 99%

COD reduction of textile effluent in three-phase fluidized bed bioreactor using Pseudomonas aureofaciens and Escherichia coli

Sur

Mukhopadhyay

2017

3 Biotech

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This paper investigated the effect of mixed cultures of Pseudomonas aureofaciens and Escherichia coli and air as gas on degradation of chemical oxygen demand (COD) in three-phase inverse fluidized beds (TPIFBs) for textile effluents with initial COD of 1200 ppm (effluent 1) and 640 ppm (effluent 2). Investigators focused on the importance of different design of gas spargers of the TPIFB for checking its effect on COD reduction performance. For this purpose, four different gas spargers were fabricated for gas flow entry into bioreactor with different % open area: Gas sparger 1 (18% open area), sparger 2 (10.42% open area), sparger 3 (8.077% open area) and sparger 4 (1.53% open area). These percentage open area decided the amount of gas flow in a unit time in batch studies, which in turn rely mainly on superficial gas velocity. The reduction in COD was measured at two different superficial gas velocity (0.00343 and 0.004068 m/s) and at two ratio of static bed height to diameter (H/D) of 0.5 and 0.25 in an aerobic mode. Textile effluent 1 resulted in 98.07% COD reduction with sparger 3 and discharged at 23.14 ppm in 28 h. Textile effluent 2 resulted in 96.5% COD reduction with sparger 2 and discharged at 22.4 ppm in 22 h. The resulting COD values of Effluent 1 and effluent 2 were in range of discharge limit and resulted at a low gas velocity of 0.00343 m/s and low H/D ratio of 0.25. The gas holdup correlation was found to be e g = 0.0064 U g 0.98 .

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Decolorization of simulated textile wastewater in an anaerobic–aerobic sequential treatment system

Cited by 60 publications

References 24 publications

The effect of cyclic anaerobic–aerobic conditions on biodegradation of azo dyes

The effect of cyclic anaerobic–aerobic conditions on biodegradation of azo dyes

Biodegradation of Azo Dyes in Anaerobic–Aerobic Sequencing Batch Reactors

COD reduction of textile effluent in three-phase fluidized bed bioreactor using Pseudomonas aureofaciens and Escherichia coli

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