Comparative investigation of indigo blue dye removal efficiency of activated carbon and natural clay in adsorption/ultrafiltration system

Abstract

In the present study, indigo blue dye removal efficiency of activated carbon (AC) and natural clay (NC) was evaluated and compared, firstly in an adsorption unit, and then in an adsorption coupling ultrafiltration (A/UF) system. Effect of operating variables like pH, contact time, adsorbent dosage, initial dyes concentration during the adsorption was investigated and consequently optimised. The optimal conditions were employed for the adsorbents during the removal of the dye in the A/UF system. The optimal amount of NC and AC was 0.4 g/L and 0.3 g/L, respectively, and NC and AC displayed adsorption capacity of 57 mg/g and 53 mg/g, respectively, at this condition. Application of UF reveals a decrease of membrane fouling for both adsorbents in A/UF system. In addition, colour retention, when the adsorbents were used in A/UF, increased significantly from 90.5% to 99% as compared to using adsorption only. The efficiency of the membrane regeneration was estimated by the determination of the water permeability after rinsing. It is noteworthy to mention that a total regeneration of the membrane after the application of continous hybrid A/UF was achieved, however, the use of UF alone exhibited a fouling decrease by 40%.

Vermicompost for Indigo Blue and Congo Red Removal

“…For CR, values vary between 0.52 mg•g −1[25] and 751 mg•g −1[29]. While for IB all values, except one[4], have MAC around 50 mg•g −1[17] [24][30]. Making a comparative critical analysis, the values revealed in this work are satisfactory.…”

“…Adsorption isotherm linearization for IB in the presence of vermicompost. Sodium carboxymethyl cellulose and chitosan Indigo Blue 50.00 [17] Zizyphusjoazeiro peel Indigo Blue 50.00 [24] Wood sawdust powder Congo Red 0.52 [25] Corncob-to-xylose residue (CCXR) Congo Red 751.00 [29] Natural clay Indigo Blue 57.00 [30] Activated carbon Indigo Blue 53.00 [30] Algerian kaolin Congo Red 6.53 [31] Natural zeolites modified with N,N-dimethyl dehydroabietylamine oxide Congo Red 69.94 [32] Coconut residual fiber Congo Red 128.94 [33] Red mud Congo Red 4.05 [34] Polysaccharide of Carica papaya seeds Congo Red 319.08 [35] The dimensionless constant (R L ) is another thermodynamic parameter to favoring the adsorption process. In this case, 0 < R L ≤ 1 indicates favorable adsorptions, while R L > 1 can be attributed to unfavorable adsorptions (Esmaeili and Beni 2015).…”

Membrane Processes Treatment and Possibility of Agriculture Reuse of Textile Effluents: Study Case in Tunisia

“…This company specialized in the production of Denim fabrics and uses the indigo blue dye (C 16 H 10 N 2 O 2 ) in the production processes. It is a dye insoluble in water and poorly soluble in solvents [8]. The sewage treatment plant performs only the biological treatment (BT) of textile effluents by activated sludge.…”

“…Several enhanced purification processes have been developed in the industrial sector to further eliminate pollutants such as chemical oxidation, electrolysis, biodegradation, adsorption, chemical coagulation, and membrane processes [6][7][8][9][10]. Among them, membrane processes have shown interesting results [11][12][13].…”