Tannery Wastewater Treatment by Sequencing Batch Biofilm Reactor

Iaconi, Claudio Di; López, Antonio; Ramadori, R.; Passino, R.

doi:10.1021/es030002u

Cited by 63 publications

(28 citation statements)

References 37 publications

(38 reference statements)

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“…In Thailand, more than 14,000 ton year −1 of leather are produced which generate more than 2.55×10 6 m 3 of wastewater year −1 . Many conventional processes were carried out to treat wastewater from tannery industry such as biological process [1][2][3][4][5], oxidation process [6][7][8] and chemical process [9][10][11], etc. One of the most interesting and effective processes for treating some pollutants in tannery wastewater is the electrochemical process because it can be applied in various techniques such as electrocoagulation, electrooxidation, electrodewatering, etc.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of organic and inorganic pollutants in tannery wastewater using electrocoagulation technique

Kongjao

Damronglerd

Hunsom

2008

Korean J. Chem. Eng.

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Tannery wastewater can cause severe environmental problems related to its high chemical oxygen demand, high biochemical oxygen demand, high total suspended solids, high oil and grease contents together with the elevated chromium concentration and objectionable color. The one-step electrocoagulation process was carried out to simultaneously remove chromium and various pollutants from tannery wastewater at ambient temperature in the laboratory scale. Low-cost commercial iron plates were employed in this study as anodes and cathode materials. Effects of various parameters were investigated including types of electrode configuration, initial pH of wastewater (7-9), current density (15.7-24.6 Am −2 ) and circulating flow rate of wastewater (0-3.67 lmin −1 ). The optimum condition was found by applying the mono-polar electrode in a parallel connection at the current density of 22.4 Am −2 , flow rate of wastewater of 3.67 lmin −1 and 20 min electrolysis time. The initial pH of wastewater ranging from 7-9 provided the similar removal efficiency. At optimum condition, more than 95% of chromium and pollutants except TKN and TDS were eliminated from the wastewater and the properties of the treated wastewater met the standard and permitted to discharge into the environment. The required energy consumption at optimum condition was less than 0.13 kWhm −3 wastewater. In addition, the COD reduction was fit very well with the first-order kinetics model.

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Section: Introductionmentioning

confidence: 99%

Simultaneous removal of organic and inorganic pollutants in tannery wastewater using electrocoagulation technique

Kongjao

Damronglerd

Hunsom

2008

Korean J. Chem. Eng.

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“…Many conventional processes were carried out to treat tannery wastewater, such as physical treatment, chemical treatment and biological treatment [12][13][14][15][16]. Among these, physical and chemical methods are considered very expensive in terms of energy and reagents consumption and generation of excessive sludge [17].…”

Section: Introductionmentioning

confidence: 99%

Halotolerant Co-Cultured Bacterial Strains used in Degradation of Tannin Isolated from Tannery Industry Contaminated Sites

Krishnaswamy¹

2016

J Clin Microbiol Biochem Technol

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The residual tannins discharged from tanning units of the leather industry have an adverse effect on living organism and causes serious environmental pollution. Biological degradation is an important mechanism of organic chemical removal in natural systems owing to its environmental compatibility. But in extreme environment like high salinity of tannery effl uent, the effi ciency of degradation by microorganisms would be exceptionally low. Therefore halotolerant microbes would play a signifi cant role in biodegradation of tannins. This study aims at isolating and identifying strains of halotolerant cocultured bacteria able to degrade tannin from soil samples contaminated by tannery industry, in order to use such bacteria for the bioremediation of contaminated sites. The bacterial isolates have been characterized by biochemically and molecularly through 16S rRNA sequencing, and identifi ed as Bacillus amyloliquefaciens and Bacillus polyfermenticus, this latter being able to degrade 92% of tannin (200 mg/L) compared to B. amyloliquefaciens. The variables (salinity, carbon and nitrogen sources) affecting the process of tannin degradation have been optimized.

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“…Therefore, tertiary treatment of these secondary effluents could be required if the concentration of recalcitrant compounds is not in accordance with legal requirements or if the biological treatment is not efficient enough for a possible reutilization of the water. The use of ozone could be useful for this purpose taking into account that post-ozonation can simplify the chemical structure of a bioresistant compound with the concomitant enhancement of its biodegradability [2]. After ozonation, the effluent could be recycled to the biological treatment.…”

Section: Introductionmentioning

confidence: 99%

Combined post-ozonation and biological treatment of recalcitrant wastewater from a resin-producing factory

Aparicio

Eiroa

Kennes

et al. 2007

Journal of Hazardous Materials

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In this study, effluent from the biological treatment of wastewater from a resin-producing factory containing recalcitrant compounds was ozonated under different conditions. Afterwards, the biodegradability of the ozonated effluent was studied under anoxic conditions. The post-ozonation of the industrial effluent was performed using a wide range of ozone doses, from 1.8 to 29.5 mg L(-1)min(-1). After the biological treatment of the ozonated effluent, organic carbon and nitrogen removals from 27 to 97% and from 27 to 80%, respectively, were achieved. The effect of the contact time was studied at a constant ozone dose of 13.0+/-1.2 mg L(-1)min(-1) and contact times ranging from 30 to 180 min. In this case, organic carbon removals from 55 to 100% and organic nitrogen removals from 41 to 77% were obtained after biological treatment.

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Tannery Wastewater Treatment by Sequencing Batch Biofilm Reactor

Cited by 63 publications

References 37 publications

Simultaneous removal of organic and inorganic pollutants in tannery wastewater using electrocoagulation technique

Simultaneous removal of organic and inorganic pollutants in tannery wastewater using electrocoagulation technique

Halotolerant Co-Cultured Bacterial Strains used in Degradation of Tannin Isolated from Tannery Industry Contaminated Sites

Combined post-ozonation and biological treatment of recalcitrant wastewater from a resin-producing factory

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