Removal of reactive dyes from aqueous solutions using combined coagulation/flocculation and adsorption on activated carbon

Furlan, Franciele Regina; Silva, Laís Graziela de Melo da; Morgado, Ayres Ferreira; Souza, Sabrina da Silva de; Souza, Selene M.A. Guelli U. de

doi:10.1016/j.resconrec.2009.09.001

Cited by 93 publications

(36 citation statements)

References 24 publications

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“…Overdosing with coagulant can result in charge reversal and restabilization of the suspension. As the alum dose alters the amount of flocs formed and their settling tendency, the removal efficiency of dye decreased with the quantity of coagulant above or below the optimum dose [13].…”

Section: Optimum Dosage Of Coagulantmentioning

confidence: 99%

“…Consequently, at constant alum dose, increase of the CaO dose above the optimum amount causes the decrease of dye removal efficiency. Furlan et al [13] carried out studies with aluminium chloride (AlCl3.6H2O) as coagulant and sodium carbonate (Na2CO3) as coagulant aid and reported that the maximum dye removal efficiencies for Reactive of coagulant aid, respectively. The nature of the curves was also similar to that obtained in the present study.…”

Section: Optimum Dosage Of Coagulant Aidmentioning

confidence: 99%

“…Activated carbon is used as adsorbent [13][14][15][16] in some combined coagulation-flocculation/ adsorption treatment systems. However, activated carbon is cost prohibitive and neither the regeneration nor the disposal of used carbon is straightforward.…”

Section: Introductionmentioning

confidence: 99%

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Removal of reactive dye from aqueous solution using coagulation–flocculation coupled with adsorption on papaya leaf

Mukhlish¹,

Khan²,

Islam³

et al. 2016

J. Mech, Eng, Sci.

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Attempts were made to investigate the effectiveness of a combined process of coagulation-flocculation and adsorption for the removal of reactive dye (Reactive Red 3BS) from aqueous solution. The effluent obtained from the coagulation-flocculation process was the raw solution for the second step of the coupling process, i.e. adsorption. The coagulation-flocculation process and the adsorption method were also studied individually. The optimum pH and the optimum dosages of alum and calcium oxide for the coagulation-flocculation process were determined. Aluminium sulphate (alum), calcium oxide and papaya leaf were used as the coagulant, coagulant aid and adsorbent, respectively. Complete dye removal from raw solution having a concentration of 100 mg L -1 could be achieved by using 300 mg L -1 of alum, 80 mg L -1 of calcium oxide and 0.20 g of papaya leaf adsorbent. Adsorption tests showed that papaya leaf could be used as a potential adsorbent for the removal of Reactive Red 3BS from aqueous solution. The maximum sorption capacities of papaya leaf in the case of sorption from pretreated solution and pure solution were 50.23 mg g -1 and 21 mg g -1 , respectively. The combined coagulation-flocculation/adsorption process may be a useful treatment technique for wastewater contaminated with reactive dye.

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Section: Optimum Dosage Of Coagulantmentioning

confidence: 99%

Section: Optimum Dosage Of Coagulant Aidmentioning

confidence: 99%

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Removal of reactive dye from aqueous solution using coagulation–flocculation coupled with adsorption on papaya leaf

Mukhlish¹,

Khan²,

Islam³

et al. 2016

J. Mech, Eng, Sci.

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“…Wastewater treatments based on coagulation/flocculation were studied by many researchers and pH was found to be maintained with a special care [20,[24][25][26]. In this regard, the physicochemical parameters such as COD, TDS and turbidity of the treated effluent were also determined within a range of pH from 6.0 to 9.0.…”

Section: Treatment With Pacmentioning

confidence: 99%

Treatment of Textile Wastewater by Coagulation Precipitation Method

2012

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Treatment of textile effluent, collected from Sattar Textile located at Chandra under Gazipur district, Bangladesh was carried out by chemical coagulation and precipitation method. The highly alkaline (pH=12.0) reddish orange colored effluent was characterized by chemical oxygen demand (COD) 1638 mg O 2 /L; total suspended solids (TSS) 9.76 g/L; total dissolved solids (TDS) 6.62 g/L and turbidly 31.24 FTU. In the present study, polyaluminium chloride (PAC) and SAFI (described in the results and discussions part) solutions were used as coagulants both individually and as their mixture at various ratios. As coagulation precipitation is highly pH sensitive, influence of pH was noted in each case. It was seen that the combined effect of both the coagulants is more effective than the individual effect of coagulants at a particular proportion at pH 6 for the removal of pollutional load from the effluent. The minimum dosages for the coagulants were worked out also from the initial beaker experiments. Finally, the effluent obtained from the large scale treatment was characterized for some effluent quality parameters and 90.17, 74.09 and 93.47% removal COD, TDS and turbidity were observed, respectively.

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“…In recent years, many methods including coagulation and flocculation (Furlan et al 2010), reverse osmosis (Gupta et al 1990), chemical oxidation (Neamtu et al 2004), biological treatment (Ledakowicz et al 2001), photodegradation (Behnajady et al 2006) and adsorption (Rafatullah et al 2010) have been developed for treating of dyes in wastewaters. Among these methods, adsorption has become proper method for treatment of aqueous effluent (Nandi et al 2009a, b).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of C.I. Acid Red 97 dye from aqueous solution onto walnut shell: kinetics, thermodynamics parameters, isotherms

Mokri

Modirshahla

Behnajady

et al. 2014

Int. J. Environ. Sci. Technol.

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This study aims to investigate the adsorption of C.I. Acid Red 97 (AR97) onto walnut shell (WS) in order to find out the desired conditions. The effect of operational parameters including adsorbent dosage, agitation speed, contact time, pH and temperature was studied in a batch mode. The results revealed that 73.33 % of AR97 (50 mg/ L) was decolorized at 60 min of contact time, agitation rate of 140 rpm and 12 g/L of adsorbent at 291 K. The rate of adsorption follows pseudo-second-order kinetics with the high correlation coefficient, which was more than 0.99. Specific surface area of WS was calculated as 1.28 m 2 /g by BET method. It was observed from the values of thermodynamics parameters such as Gibbs free energy (DG°), enthalpy (DH°) and entropy (DS°) that the nature of adsorption process is spontaneous, exothermic and mainly physical. Langmuir, Fruendlich and Redlich-Peterson isotherms were applied for mathematical description of equilibrium data and findings indicated that it is in good agreement with Fruendlich model.

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Removal of reactive dyes from aqueous solutions using combined coagulation/flocculation and adsorption on activated carbon

Cited by 93 publications

References 24 publications

Removal of reactive dye from aqueous solution using coagulation–flocculation coupled with adsorption on papaya leaf

Removal of reactive dye from aqueous solution using coagulation–flocculation coupled with adsorption on papaya leaf

Treatment of Textile Wastewater by Coagulation Precipitation Method

Adsorption of C.I. Acid Red 97 dye from aqueous solution onto walnut shell: kinetics, thermodynamics parameters, isotherms

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