Removal of Dyes by Aqueous Mixed Coagulants (original) (raw)
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—A textile is the major source of water consumption and waste water pollution, there are various treatment techniques to remove color and waste water textile pollution. Coagulation flocculation is the widely used method to remove pollution from textile due to suspended particles .in this research the two coagulant were selected that is Alum and ferric chloride in order to select the suitable ones with optimum removal effiency in terms of color. the research shown that When the PH is varied it has been seen that improved color removal were obtained by reducing the PH to 5.0 also it has been observed that at PH 5.0 the incremental increase of PH is 78% and lowest value was at 48% in case of Alum and in the case of Fecl3 the maximum percentage removal for color removal was 79-80%.Color is the main attraction of any fabric no matter how excellent its constitution, if unsuitably colored it is bound to be a failure as a commercial product. Sustainability of the environment has become a focus; hence the need for improvement and monitoring of textile waste water discharges, for which major concern is color. Color in textile dyeing and finishing effluents is as a result of large amounts of dye stuffs left during the dyeing stages and inefficient dyeing processes often resulting in unfixed forms.
Removal of Colour from Textile Wastewater Using Two- Step Coagulation Process
2014
The waste water from the textile dyeing industry pr oduces large amount of coloured water and this need s to be treated before discarding in the ecosystem. There a re various treatment technologies to remove colour from this wastewater which includes the most primitive yet ef fective method of coagulation-flocculation. In this research, inorganic coagulants like Alum (t rivalent) and ferrous sulphate (bivalent) were appl ied on commercial dyes Congo Red and Direct green 41 at different pH values of 8,9,10. Various parameters suc h as colour removal percentage, pH changes, TDS (Total Dissolved Solids), settled sludge volume has been evaluated . It has been estimated that though FeSO4 is the bett er coagulant for colour removal but somehow it prod uced an anesthetic colour to the residual water in compa rison to Alum. Moreover Congo red being less complex in structure is removed more effectively than Direct green 41.
IAEME, 2019
In this investigation the effect of using natural coagulants, Aloe Vera, Arabic Gum, Calcium gene and orange peels with alum Al2 (SO4)3 and compared with alum alone was examined to remove three reactive dyes: Reactive Blue (RB), Reactive Red (RR) and Reactive Yellow (RY) from simulated textile wastewater in single and ternary systems utilizing coagulation process. Batch tests were achieved to study the impacts of pH, dosage and initial concentration onto coagulation process. Dose of natural coagulants and alum were used (5 mg/L). After treatment, the outcomes mirrored that the natural coagulants have a high removal efficiency when they blended in with alum and The results showed that Arabic gum is not suitable for dye removal and the use of Aloe Vera as coagulant aid with alum were better compared with the utilization of alum alone. The utilizing of 50% Alum + 50% Aloe Vera gave removal efficiencies 92%, 93 % and83% for RB, RR and RY respectively compared with 92%, 89% and 78% for RB, RR and RY respectively using alum alone, this decreased the alum dosage from 5mg/l to 2.5mg/l. This procedure will consider provision cost and decrease health danger related with utilizing of alum
REMOVAL OF REACTIVE DYES USING DIFFERENT COAGULANTS FOR TEXTILE WASTEWATER
Effluents of large variety of industries usually contain important quantities of dyes. The discharge of these colored compounds in the environment causes considerable non-aesthetic pollution and serious health-risk factors. Since conventional wastewater treatment plants cannot degrade the majority of these pollutants, powerful methods for the decontamination of dyes wastewaters have received increasing attention over the past decade. In this report a general review of efficient coagulation technology is developed to decolorize and/or degrade dyeing effluents for environmental protection. The effect of coagulant dosage and pH of wastewater on the color removal was examined, and the % of color removal results treated by different doses of coagulants like alum, ferric chlorite and ferrous sulphate at constant contact duration (4 hours), optimum pH from 6-8 using more coagulant doses and room temperature.Color removal percentage reduction (maximum) corresponds to 75.0 % to 85.0% , on reactive dyes The efficiency of color removal increased with increasing coagulant dose
Pretreatment of Reactive Dye from Textile Wastewater by Coagulation Technology
2016
A physicochemical treatment was applied to study on removal of commercially used reactive dye and investigate the effectiveness of coagulation-flocculation from textile wastewater. Three types of coagulants were used like aluminium sulphate (alum), polyaluminium chloride (PAC), and magnesium chloride (MgCl2). Polyelectrolyte, Koaret PA 3230 was used as the coagulant aid. The coagulant dosage between 400 ppm to 5,000 ppm was studied using jar test. The changes of pH, types and dosage of coagulant, and the addition of coagulant aid on the percentage removal and the concentration of the dyes were determined through colour point. The results show that up to 90% colour removal for reactive dye could be achieved using alum of concentration 6,000 ppm and pH 2.4. Meanwhile, 99 % colour removal could be achieved using MgCl2with concentration of 4,000 ppm and pH 10.4, whereas 100% colour removal could be achieved using PAC with concentration of 2,000 ppm and pH 4.1. Among the coagulants used, PAC was the most effective coagulant in treating each dye, with the colour removal up to 100% at the dosage of 800 ppm. The flocs settling time for the treatment with MgCl2 was shorter than the treatment with PAC and the treatment with Alum was longer than the treatment with MgCl2 and PAC. This result can contribute some knowledge on the use of effective coagulants in treating textile industrial wastewater.
2015
Coagulation and flocculation are most widely methods used for dye and pollution removal from various wastewaters. The aim of this study is efficiency comparison of inorganic coagulant (Alum and Ferric Cchloride) for treatment of textile factory wastewater. The appropriate coagulant was selected at optimum condition for treatment of textile's factory wastewater by measuring of dye, COD, BOD5 and TSS parameters. The different pH (4, 5, 6, 7, 8 and 9) was used for determine the optimum pH. Totally, 240 samples were collected and exanimated according the standard methods of wastewater and water tests. Results showed that the ferric chloride has more removal efficiency than alum in removal of COD, TSS and dye. The most removal of COD, TSS and dye using alum was obtained 36, 19 and 68.8 while for ferric chloride was obtained 72, 60 and 98 respectively. The optimum pH 7 and 5 were obtained for alum and ferric chloride respectively. Based on the results, it can be concluded that COD, TS...
Technology Removal of Reactive Dyes Using Different Coagulants for Textile Wastewater
2015
Effluents of large variety of industries usually contain important quantities of dyes. The discharge of these colored compounds in the environment causes considerable non-aesthetic pollution and serious health-risk factors. Since conventional wastewater treatment plants cannot degrade the majority of these pollutants, powerful methods for the decontamination of dyes wastewaters have received increasing attention over the past decade. In this report a general review of efficient coagulation technology is developed to decolorize and/or degrade dyeing effluents for environmental protection. The effect of coagulant dosage and pH of wastewater on the color removal was examined, and the % of color removal results treated by different doses of coagulants like alum, ferric chlorite and ferrous sulphate at constant contact duration (4 hours), optimum pH from 6-8 using more coagulant doses and room temperature.Color removal percentage reduction (maximum) corresponds to 75.0 % to 85.0% , on re...
Dye Wastewater Treatment: Removal of Reactive Dyesusing Inorganic and Organic Coagulants
I Control Pollution, 2014
Wastewater treatment in textile and dye industry mainly involves treatment of highly colored wastewater containing variety of dyes in different concentrations. The wastewater needs to be treated prior to discharge by effectively removing dye color in order to protect environment and as per the statutory guidelines. Coagulation is the most commonly used method in the treatment of textile wastewater. In the present work, we report experimental work on treatment of synthetic waste containing pure reactive dyes, removal of reactive blue dye, using various commercial coagulants such as alum, polyaluminium chloride (PAC), polydiallyldimethylammonium chloride (poly-DADMAC) and polyamines. The optimum coagulant dose and pH values were determined for these inorganic and organic coagulants by comparing color removal efficiency. It was found that for inorganic coagulant PAC, the color removal was near total at concentration of 200 ppm and above, whereas for alum much higher dosage was needed (...
2017
In this research, the potential of aluminum-based water treatment residual (WTR) discharged from the water treatment plant has been evaluated as a coagulant for color removal from cationic and anionic dye solutions. The sample of water treatment residuals (WTR) was collected from water treatment plant (Nigdi, Pune) where Poly Aluminum Chloride (PAC) is used as coagulant in the coagulation/flocculation process. The effects of initial pH, initial dye concentration and WTR dosage were studied. The results have shown that maximum color removal of 81.08, 77.88 and 72% for anionic dye and 94.54, 91.77 and 84.53% for cationic dye were obtained at initial dye concentrations of 25, 50 and 75mg/L, respectively, at pH 3.0 and WTR dose of 120mg/L. Although lower amount of WTR were required for the removal of dyes from wastewater, the reuse of WTR as a low cost material can offer several advantages such as higher efficiency of cationic an anionic dye color removal and economic savings on overall...
Study of chemical coagulation conditions for a disperse red dye removal from aqueous solutions
Membrane Water Treatment, 2018
Coagulation process using aluminum sulfate (Al 2 (SO 4) 3) and ferric chloride (FeCl 3) was employed as a treatment method for decolorization of a synthetic textile wastewater containing red dye in this paper. Factors such as initial pH, coagulant dosage, initial concentration, conductivity and mixing conditions that influence color removal efficiency were experimentally tested. It was found that Al 2 (SO 4) 3 is more efficient than FeCl 3 as coagulant. When 40 mgL-1 aluminum sulfate was used, results showed that color induced by the red dye was efficiently removed ( 90 %) and was obtained in a large range of initial pH from 4 to 8 with, and for a dye concentration lower than 235 mg L-1. After addition of the coagulant, the medium had to be mixed for 30 min at 60 rpm, then allowed to settle for 40 min. The effects of water conductivity in the range 0.035-2.42 mS cm-1 and dye concentration up to 380 mg L-1 were also followed and discussed.