Removal of Dyew Aste Colour From Sew Age Effluent – The Use of a Full Scale Ozone Plant

Churchley, John

doi:10.2166/wst.1994.0120

Cited by 82 publications

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“…Among these, physical and chemical methods are considered very expensive in terms of energy and reagents consumption (Churchley, 1994, Stern, et al 2003. And generation of excessive sludge, (Chu, 2001).…”

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confidence: 99%

Characterization of tannery wastewater and its treatment by aquatic macrophytes and algae

Jahan

Akhtar

Khan

et al. 2015

Bangladesh J. Sci. Ind. Res.

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Tannery wastewater contains large amount of chemical compounds including toxic substances. So an attempt was made to characterize physiochemical parameters of tannery wastewater and investigate the efficacy, and applicability of the biological treatment utilizing aquatic plants macrophytes and algae. Total suspended solids TSS and total Dissolved solid in the original wastewater were found 1250 mg/l and 21300 mg/l respectively. The pH and temperature were 8.3 and 29°C. Dissolved Oxygen (DO), Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) were 2.72 mg/l, 4464 mg/l and 12840 mg/l respectively. Electrical conductivity (EC) was 42500 ?S/cm anions PO43- and Cl- were 17.1 mg/l and 13.8 mg/l respectively. Heavy metals were also analysed. Fe, Na, Zn, Cr, Pb and Ca were found 14.675 mg/l, 12006 mg/l, 1.5241 mg/l, 10.348 mg/l, 0.1818 mg/l and 0.4112 mg/l respectively. Biological treatment with aquatic plants, algae and their combination treatments were found to be effective for the reduction of some physiochemical parameters. Treatment conducted with Eichhornia crassipes was found most effective in reducing COD, EC, TDS and TSS. Mixed treatment resulted reduction of pH from 8.3 to 6.21. Both macrophytes and algae exhibited good heavy metal uptake tendency, but Eichhornia crassips was identified as most effective for the removal of heavy metals in the wastewater because of its extensive root system which provides to help the uptake of pollutants from the wastewater. DOI: http://dx.doi.org/10.3329/bjsir.v49i4.22626 Bangladesh J. Sci. Ind. Res. 49(4), 233-242, 2014

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confidence: 99%

Characterization of tannery wastewater and its treatment by aquatic macrophytes and algae

Jahan

Akhtar

Khan

et al. 2015

Bangladesh J. Sci. Ind. Res.

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“…Different methods of color removal from industrial effluents have been proposed which include aerobic and anaerobic microbial degradation, coagulation, flotation, membrane filtration and chemical oxidation but none of these methods have been found to be effective enough for the industrialists to adopt for the treatment of colored effluents (Churchley, 1994). For example, biological treatment processes remove BOD, COD and suspended solids to some extent, but they have been found to be largely ineffective in removing color from wastewater (Churchley, 1994).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…For example, biological treatment processes remove BOD, COD and suspended solids to some extent, but they have been found to be largely ineffective in removing color from wastewater (Churchley, 1994). Also, coagulation process effectively decolorizes insoluble dyes but fails to work well with soluble ones (Churchley, 1994). Adsorption, on the other hand, has been found to be very efficient in treating wastewater containing chemically stable pollutants, is a sludge free process and can completely remove even very minute amounts of dyes from wastewater (Guendy, 2006;El-Nemr et al, 2009;Nigarn et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Color removal from textile wastewater using date seeds activated carbon

Rahman

Ahmed

Salehin

et al. 2017

Bangladesh J. Sci. Ind. Res.

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Powdered Activated Carbon (PAC) developed from date seeds was used as an adsorbent for the removal of color from textile wastewater. Batch adsorption experiments were performed in the laboratory with varying process parameters (temperature, pH, agitation, adsorbent dosage, particle size) over a range of contact periods and wastewater pollutant (color) levels. It was found that the removal mechanism could be better characterized by the Freundlich adsorption isotherm model compared to the Langmuir model. Also, The Lagergren's pseudo second order kinetic model fitted relatively well (R 2 = 0.99) over the selected range of contact times (5-60 minutes) and initial color concentrations (800-1200 Pt-Co unit) compared to the pseudo-first order model indicating that chemisorption may be playing a dominant role in the adsorption process. Both external film and intra-particle pore diffusion mechanism were involved in the adsorption process but film diffusion was found to be rate limiting. While analyzing the thermodynamics, the negative value of free energy (-1.83 to -3.4 KJ/mole), positive value of enthalpy (0.26 to 0.28 KJ/mole) and entropy (0.97 to 1.01 J/K/Mole) associated with the color removal mechanism indicated that adsorption was spontaneous and endothermic with increased disorder and randomness at the solid-liquid interface of the date seeds PAC. These experiments suggests that date seeds PAC is a very effective adsorbent, capable of removing a significant amount of color from industrial wastewater if process variables can be optimized and can be explored as a potential low-cost alternative to expensive tertiary treatment options.

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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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Removal of Dyew Aste Colour From Sew Age Effluent – The Use of a Full Scale Ozone Plant

Cited by 82 publications

References 0 publications

Characterization of tannery wastewater and its treatment by aquatic macrophytes and algae

Characterization of tannery wastewater and its treatment by aquatic macrophytes and algae

Color removal from textile wastewater using date seeds activated carbon

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

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