Treatment of wastewaters from dye industry

Koprivanac, Natalija; Bosanac, G.; Grabarić, Zorana; Papić, Sanja

doi:10.1080/09593339309385304

Cited by 45 publications

(17 citation statements)

References 2 publications

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“…Thus, the model wastewaters W1 and W2 are first treated with polyelectrolytes (Levafloc R and the PACl-PA mixture) and further treated with different dilutions of commercial PACl. The Levafloc R commercial flocculant, which efficiently removed reactive (textile) dye color (Koprivanac et al, 1993), and PACl-PA and PACl did not perform satisfactorily for this type of wastewater because it was not possible to obtain treated water, after flocculation and filtration, with a turbidity less than 1 NTU (a primary criterion for efficient flocculation). Table 2 presents results of flocculation with different polymer volume concentrations (, %), without pH adjustment, for W2.…”

Section: Resultsmentioning

confidence: 94%

Flocculation as a Treatment Method for Printing Ink Wastewater

Meteš¹,

Koprivanac²,

Glasnović³

2000

Water Environment Research

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To find a suitable method for treating printing ink wastewater, the fundamental behavior and characteristics of two kinds of experimental flexographic printing ink wastewater were studied. The differences between the two prepared wastewaters were the use of different kinds of binders-resins and pigments and different solvent contents representative of real printing inks. Examination of the water quality characteristics of the simulated wastewaters confirmed that the wastewaters were too highly loaded with organic substances for discharge and were not biodegradable.The prepared wastewaters also showed some colloidal dispersion properties. Such properties were strongly affected by pH. As pH decreased, the negative electrical charge of the particles was neutralized, resulting in their aggregation. Therefore, the present study focused on optimizing flocculation processes to destabilize the dispersions. Inorganic electrolytes were found to be more efficient flocculants than the organic polyelectrolytes tested. Even when added in very small quantity, inorganic electrolytes caused extensive neutralization of particle charges and consequent floc formation. The optimum flocculant concentration was determined on the basis of electrokinetic (zeta) potential and turbidity measurements.Mixing intensity, expressed as the mean mixing velocity gradient (G), and time of mixing (t) were investigated, and the optimum Gt product (Gt OPT ϭ 4.45 ϫ 10 4 ) was determined using turbidity values of supernatant water and sedimentation velocity of obtained flocs as criteria for flocculation efficiency. Flocculation was shown to be a simple and efficient treatment from an economic and technical point of view. It was capable of removing a substantial portion of the organic content, completely removing color and turbidity. Water Environ. Res., 72, 680 (2000).

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Section: Resultsmentioning

confidence: 94%

Flocculation as a Treatment Method for Printing Ink Wastewater

Meteš¹,

Koprivanac²,

Glasnović³

2000

Water Environment Research

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“…In soft water, humus inhibited particle stabilization, and the increase in coagulant dosage corresponded to the dosage require for humus removal from pure solutions. The removal of color from organic dye wastewater by inorganic coagulation or polymeric flocculation was evaluated (Koprivanac et al, 1993). Optimum pH was between 6 and 7 for polymeric flocculants and between 2.5 and 4 for inorganic coagulants.…”

Section: Coagulation /Flocculationmentioning

confidence: 99%

Physicochemical processes

Matsumoto¹,

Jensen²,

McGinley³

et al. 1994

Water Environment Research

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“…Although, biological processes can successfully degrade the organic matter present, they usually exhibit low color removal and are susceptible to toxic compounds, which limit their applicability as singletreatment systems. [8][9][10] In contrast, physical and/or chemical treatment processes including coagulation/flocculation, [11,12] adsorption, [13] flotation, [14] oxidation-reduction, [15][16][17] and Fenton's reagent [10,[18][19][20] have been effective in removing all the pollutants of concern. Most of the above mentioned methods, however, require the addition of chemicals, which may substantially increase operating costs.…”

Section: Introductionmentioning

confidence: 99%

Treatment of a Textile Dye Wastewater by an Electrochemical Process

Fongsatitkul

Elefsiniotis

Boonyanitchakul³

2006

Journal of Environmental Science and Health, Part A

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This study explored the effectiveness of an electrochemical process to treat a sulfur dye wastewater from a textile industry. The treatment system included a 4.0 L reactor equipped with five steel electrode plates, and a separate sedimentation tank of equal liquid volume. The experimental part involved two distinct, sequential stages. In the first stage, the effect of initial pH and electrical charge (i.e., current times reaction time) on the treatment process was explored. Experiments were conducted in a factorial mode, involving three initial pH values (3, 4 and 5), and six electrical charges (ranging from 150 to 1,350 coulomb), respectively. Results indicated that chemical oxygen demand (COD), total suspended solids (TSS), and color removal efficiency improved with a decrease in initial pH and an increase in electrical charge. Overall, high percent removal values were observed ranging from 63% to 80% for COD, 81% to 96% for TSS, and 93% to 99% for color. During the second stage, the electrode corrosion pattern was investigated for a period of 45 days. Under stable operating conditions, electrode consumption was found to conform to Faraday's law. Moreover, process performance regarding COD, TSS, and color reduction was comparable to that obtained in the first stage of the study.

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Treatment of wastewaters from dye industry

Cited by 45 publications

References 2 publications

Flocculation as a Treatment Method for Printing Ink Wastewater

Flocculation as a Treatment Method for Printing Ink Wastewater

Physicochemical processes

Treatment of a Textile Dye Wastewater by an Electrochemical Process

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